阅读说明：本技术 一种电网输电线路断路器失灵保护启动回路现场校验方法 (On-site calibration method for failure protection starting circuit of power grid transmission line breaker ) 是由 王世祥 吴海涛 刘自华 于 2019-09-23 设计创作，主要内容包括：本发明提供一种电网输电线路断路器失灵保护启动回路现场校验方法,包括短接失灵保护装置与一次I、II母线刀闸间的共同并接点；短接完成后,所有保护功能硬压板及接点初始为断开,选第一或第二继电保护装置为待操作继电保护装置并确定保护动作；选出过流保护装置的过流保护接点及该过流保护接点对应连接待操作继电保护装置上的保护功能硬压板和开关继电器,并待通过闭合控制来启动保护动作后,利用失灵保护装置加载测试信号得到测试结果为启动失灵成功,校验出失灵保护装置与过流保护装置及对应连接待操作继电保护装置间的所有线路连接均正确。实施本发明,现场校验出断路器失灵保护启动回路的配线错误或漏接线或保护功能硬压板被损坏等问题。(The invention provides a field calibration method for a failure protection starting circuit of a power grid transmission line breaker, which comprises the steps of connecting a common parallel point between a short-circuit failure protection device and a primary I, II bus knife switch; after the short circuit is completed, all the protection function hard pressing plates and the contacts are initially disconnected, a first relay protection device or a second relay protection device is selected as a relay protection device to be operated, and a protection action is determined; selecting an overcurrent protection contact of the overcurrent protection device, correspondingly connecting a protection function hard pressing plate and a switch relay on the to-be-operated relay protection device with the overcurrent protection contact, and after starting protection action through closing control, utilizing a failure protection device to load a test signal to obtain a test result as success of starting failure, and verifying that all line connections among the failure protection device, the overcurrent protection device and the to-be-operated relay protection device are correct. By implementing the invention, the problems of wiring error or missing wiring of the breaker failure protection starting circuit or damage of a hard pressing plate with a protection function and the like are verified on site.)

1. a field calibration method for a failure protection starting circuit of a power grid transmission line breaker is used for the failure protection starting circuit of the breaker comprising a failure protection device, an overcurrent protection device, a first relay protection device, a second relay protection device, an operation box operation circuit, a primary I bus disconnecting link and a primary II bus disconnecting link, and is characterized by comprising the following steps:

When the primary I bus disconnecting link and the primary II bus disconnecting link are determined to be in a disconnected state, one end of the primary I bus disconnecting link is connected with a common parallel connection point between the primary I bus disconnecting link and the primary II bus disconnecting link, and the other end of the primary I bus disconnecting link and the primary II bus disconnecting link are connected with a lead of the failure protection device to realize short circuit;

After the short circuit is completed, all protection function hard pressing plates on the first relay protection device, the second relay protection device and the operation loop of the operation box are initialized to be in an exit state and all over-current protection contacts on the over-current protection device are initialized to be off, the first relay protection device or the second relay protection device is selected as a to-be-operated relay protection device, and the current protection action to be realized on the to-be-operated relay protection device is further determined; the protection actions to be realized comprise A-phase single-phase protection actions, B-phase single-phase protection actions, C-phase single-phase protection actions, two-phase protection actions formed by combining any two of ABC three phases and ABC three-phase protection actions;

determining that an overcurrent protection contact selected from the overcurrent protection device and a selected overcurrent protection contact are correspondingly connected with a protection function hard pressing plate and a switch relay on the relay protection device to be operated according to the protection action to be currently realized on the relay protection device to be operated, starting the protection action to be currently realized on the relay protection device to be operated by controlling the selected overcurrent protection contact of the overcurrent protection device to be closed and connecting the selected overcurrent protection contact with the protection function hard pressing plate on the relay protection device to be operated to enter an input state and closing the switch relay, loading a test signal to the failure protection device, and further checking that the failure protection device, the overcurrent protection device and the selected overcurrent protection contact on the circuit breaker failure protection starting circuit are correspondingly connected with the relay protection device to be operated according to the result of the test signal generated by judging that the failure protection device is successfully started The protection function on the hard press plate and the switch relay are all connected correctly.

2. the grid transmission line breaker failsafe start loop field verification method of claim 1, wherein the method further comprises:

If the fact that the test result generated by the fact that the fault protection device is loaded with the test signal is judged to be failed in starting is judged, all lines between a protection function hard pressing plate and a switch relay, which are correspondingly connected with the overcurrent protection device and the selected overcurrent protection contact on the relay protection device to be operated, on the breaker fault protection starting circuit are checked to be connected with at least one error, and the line connection with the error between the protection function hard pressing plate and the switch relay, which are correspondingly connected with the overcurrent protection device and the selected overcurrent protection contact on the relay protection device to be operated, on the breaker fault protection starting circuit is further adjusted to be correct.

3. the grid transmission line breaker failure protection startup loop field verification method of claim 1 or 2, wherein the method further comprises:

and disconnecting connecting lines between the first relay protection device and the second relay protection device and the failure protection device respectively, loading a test signal to the failure protection device after controlling all over-current protection contacts on the over-current protection device to be closed and a protection function hard pressing plate on the operation box operation loop to enter an input state and at least one relay to be closed, and further checking that all line connections between the failure protection device and the over-current protection device and between the failure protection device and the operation box operation loop are correct if the fact that a test result generated by the test signal loaded to the failure protection device is successful in starting failure is judged.

4. The grid transmission line breaker failsafe start loop field verification method of claim 3, wherein the method further comprises:

If the test result generated by the failure protection device loaded with the test signal is judged to be failure in starting, at least one error is checked out in the line connection among the failure protection device, the overcurrent protection device and the operation box operation loop on the circuit breaker failure protection starting loop, and the line connection with the error among the failure protection device, the overcurrent protection device and the operation box operation loop on the circuit breaker failure protection starting loop is further adjusted to be correct.

5. The grid transmission line breaker failure protection startup loop field verification method of claim 1 or 3, wherein the method further comprises:

Disconnecting a lead with one end connected with a common parallel connection point between the primary I bus disconnecting link and the primary II bus disconnecting link and the other end connected with the failure protection device, controlling the primary I bus disconnecting link to be closed and the primary II bus disconnecting link to be disconnected, and if the fact that the test result generated by the failure protection device loaded with the test signal is continuously maintained as the success of starting failure can be judged, determining that all line connections between the primary I bus disconnecting link and the failure protection device are correct; on the contrary, if the test result generated by judging that the failure protection device is loaded with the test signal is converted from successful start-up failure to failed start-up failure, the fact that the line connection between the primary I bus disconnecting link and the failure protection device has at least one error is determined, and the fact that the line connection between the failure protection device and the primary I bus disconnecting link has the error is adjusted to be correct.

6. the grid transmission line breaker failsafe start loop field verification method of claim 5, wherein the method further comprises:

controlling the primary I bus disconnecting link to be disconnected and the primary II bus disconnecting link to be closed, and if the test result generated by the failure protection device loaded with the test signal can be continuously maintained as the failure starting success, determining that all the lines between the primary II bus disconnecting link and the failure protection device are correctly connected; on the contrary, if the test result generated by judging that the failure protection device is loaded with the test signal is converted from successful start-up failure to failed start-up, determining that the line connection between the primary II bus disconnecting link and the failure protection device has at least one error, and further adjusting the line connection with the error between the failure protection device and the primary II bus disconnecting link to be correct.

7. The method for field verification of a start-up loop for failure protection of a circuit breaker of a power grid transmission line according to claim 1, wherein closing of the respective switch relays of the first relay protection device and the second relay protection device is achieved by loading the respective voltage setting value and current setting value on the line of each switch relay and the hard pressure plate of the corresponding protection function.

8. the grid transmission line circuit breaker failure protection startup loop field verification method of claim 1, wherein closing of each overcurrent protection contact on the overcurrent protection device is achieved by loading with a corresponding overcurrent.

9. The field verification method for the failure protection starting circuit of the power grid transmission line breaker as claimed in claim 3, wherein the closing of the two relays on the operating circuit of the operating box is realized by the action of a protection contact connected with the front end of the operating box.

Technical Field

The invention relates to the technical field of relay protection, in particular to a field calibration method for a failure protection starting circuit of a power grid transmission line breaker.

Background

in order to increase the electric energy transmission capacity of the power grid transmission line, a split-phase circuit breaker is often adopted, transmission line corridors are generally dozens of kilometers or even hundreds of kilometers, and the probability of faults is high, so that the power grid transmission line breaks away from the circuit breaker through protection actions to remove the faults, and the situation of failure in operation failure may occur in the process due to a secondary circuit or the breaker. Therefore, in order to prevent accidents, enlarge the range and improve the stability of the system, the power grid and transmission lines need to be provided with breaker failure protection.

the breaker failure protection is that when the relay protection action of the fault electrical equipment sends a trip command and the breaker fails, the breaker failure is judged by using the protection action information of the fault equipment and the current information of the circuit breaker which fails, other related breakers in the same station can be cut off in a short time limit, the power failure range is limited to the minimum, the stable operation of the whole power grid is ensured, and the serious burning loss of fault elements such as a generator and a transformer and the breakdown and collapse accidents of the power grid are avoided. Therefore, the breaker failure protection is important protection in relay protection as important near backup protection of a power grid and main equipment, and directly influences the stable operation of a power system.

Since a circuit breaker failure is a double fault that in the event of a grid fault in turn superimposes a failure on the operation of the circuit breaker, allowing its protection requirements to be properly reduced, but should isolate the fault at a minimum extent, the smaller the extent of the fault removed by the circuit breaker failure protection action, the better. Considering that a plurality of transmission lines, main transformers and bus-tie intervals are possible in a transformer substation, the fault isolation of the breaker failure protection in the minimum range can be realized only by accurately identifying the occurrence of the breaker failure in a specific certain interval, and therefore the breaker failure protection is required to be provided with a failure starting loop according to the interval. The circuit breaker failure protection starting circuit is an important component of circuit breaker failure protection, is one of keys for ensuring the correct work of the whole set of protection, must be safe and reliable, and needs to realize double judgment to prevent single condition judgment of circuit breaker failure and false starting caused by failure of circuit breaker due to blockage of a protection contact, failure in return, false touch, false electrification and the like.

As shown in fig. 1, the schematic diagram of the logical structure connection when the circuit breaker malfunction protection starting circuit in the prior art is normal is shown, where the circuit breaker malfunction protection starting circuit includes a malfunction protection device M1, an overcurrent protection device M2, a first relay protection device M3 and a second relay protection device M4 that implement duplicate protection, an operation box operation circuit M5 that connects other protections (such as bus protection, stability control device protection, etc.), a primary I bus disconnecting link 1YQJ, and a primary II bus disconnecting link 2 YQJ; the failure protection device M1 is connected to each phase protection contact of the first relay protection device M3 through the three-phase overcurrent protection contacts LJA1, LJB1 and LJC1 of the overcurrent protection device M2, and then is closed to form a loop through the primary I bus disconnecting link 1YQJ or the primary II bus disconnecting link 2YQJ, and is also connected to each phase protection contact of the second relay protection device M4 through the three-phase overcurrent protection contacts LJA1, LJB1 and LJC1 of the overcurrent protection device M2, and then is closed to form a loop through the primary I bus disconnecting link 1YQJ or the primary II bus disconnecting link 2YQJ, and is also connected to the operation box operation loop M5 through the three-phase overcurrent protection contacts LJA2, LJB2 and LJC2 connected in series on the overcurrent protection device M2, and then is closed to form a loop through the primary I bus disconnecting link 1YQJ or the primary II bus disconnecting link 2 YQJ.

It should be noted that each phase of the first relay protection device M3 and the second relay protection device M4 has a protection function hard pressing plate for controlling switching and a corresponding switch relay, such as the switch relay TJA1 corresponding to the a-phase protection function hard pressing plate 1LP9 in the first relay protection device M3, the switch relay TJB1 corresponding to the B-phase protection function hard pressing plate 1LP10, and the switch relay TJC1 corresponding to the C-phase protection function hard pressing plate 1LP11, and such as the switch relay TJA2 corresponding to the a-phase protection function hard pressing plate 2LP9, the switch relay TJB2 corresponding to the B-phase protection function hard pressing plate 2LP10, and the switch relay TJC2 corresponding to the C-phase protection function hard pressing plate 2LP11 in the second relay protection device M4.

the operation box operation loop M5 includes a protection function hard pressure plate LP for controlling switching and two relays TJQ and TJR connected in parallel correspondingly, and in a logical structure connection schematic diagram (as shown in fig. 2) of the operation box operation loop M5, other protection action contacts 1 refer to empty normally open contacts provided by other protections (such as bus protection) in the substation, and are closed once the corresponding protection actions (such as bus protection actions or test short circuits) are performed, and the relays TJQ are driven to close; the other protection action contacts 2 are normally open contacts which are empty and provided for other protections (such as the action of a stability control device) in the substation, and are closed once corresponding protection actions (such as the action of the stability control device or test short circuit) are carried out, and the relay TJR is driven to act and close. The primary I bus disconnecting link 1YQJ or the primary II bus disconnecting link 2YQJ is respectively connected with a plurality of lines, for example, in a logical structure connection schematic diagram (as shown in fig. 3) of the line corresponding to the primary I bus disconnecting link 1YQJ, when the primary I bus disconnecting link 1YQJ is closed, the line 1 and the line 2 are connected.

Since the circuit breaker failure protection starting circuit may have problems such as wiring errors or missing wiring or damage of a hard pressing plate with a protection function (as shown in fig. 4), before the circuit breaker failure protection starting circuit is put into operation, the functions of the circuit breaker failure protection starting circuit must be checked step by step according to a design drawing, and the circuit breaker failure protection starting circuit can be put into operation after the problems are found to exist through checking and are eliminated. However, a method for gradually checking the failure protection starting circuit of the power grid transmission line breaker is still lacked at present, and particularly, the field checking of the failure protection starting circuit of the power grid transmission line breaker provides guarantee for the safe operation of the power grid transmission line.

Disclosure of Invention

the technical problem to be solved by the embodiment of the invention is to provide a field calibration method for a failure protection starting circuit of a power grid transmission line breaker, which can be used for calibrating the problems of wiring errors or damaged wiring leakage or a hard pressing plate with a protection function on site, and the like, so that hidden dangers can be found in time, and the safe operation of the power grid transmission line is guaranteed.

In order to solve the above technical problem, an embodiment of the present invention provides a field calibration method for a failure protection starting circuit of a power grid transmission line breaker, which is used for a failure protection starting circuit of a breaker including a failure protection device, an overcurrent protection device, a first relay protection device, a second relay protection device, an operation box operation circuit, a primary I bus disconnecting link and a primary II bus disconnecting link, and the method includes the following steps:

when the primary I bus disconnecting link and the primary II bus disconnecting link are determined to be in a disconnected state, one end of the primary I bus disconnecting link is connected with a common parallel connection point between the primary I bus disconnecting link and the primary II bus disconnecting link, and the other end of the primary I bus disconnecting link and the primary II bus disconnecting link are connected with a lead of the failure protection device to realize short circuit;

After the short circuit is completed, all protection function hard pressing plates on the first relay protection device, the second relay protection device and the operation loop of the operation box are initialized to be in an exit state and all over-current protection contacts on the over-current protection device are initialized to be off, the first relay protection device or the second relay protection device is selected as a to-be-operated relay protection device, and the current protection action to be realized on the to-be-operated relay protection device is further determined; the protection actions to be realized comprise A-phase single-phase protection actions, B-phase single-phase protection actions, C-phase single-phase protection actions, two-phase protection actions formed by combining any two of ABC three phases and ABC three-phase protection actions;

determining that an overcurrent protection contact selected from the overcurrent protection device and a selected overcurrent protection contact are correspondingly connected with a protection function hard pressing plate and a switch relay on the relay protection device to be operated according to the protection action to be currently realized on the relay protection device to be operated, starting the protection action to be currently realized on the relay protection device to be operated by controlling the selected overcurrent protection contact of the overcurrent protection device to be closed and connecting the selected overcurrent protection contact with the protection function hard pressing plate on the relay protection device to be operated to enter an input state and closing the switch relay, loading a test signal to the failure protection device, and further checking that the failure protection device, the overcurrent protection device and the selected overcurrent protection contact on the circuit breaker failure protection starting circuit are correspondingly connected with the relay protection device to be operated according to the result of the test signal generated by judging that the failure protection device is successfully started The protection function on the hard press plate and the switch relay are all connected correctly.

Wherein the method further comprises:

If the fact that the test result generated by the fact that the fault protection device is loaded with the test signal is judged to be failed in starting is judged, all lines between a protection function hard pressing plate and a switch relay, which are correspondingly connected with the overcurrent protection device and the selected overcurrent protection contact on the relay protection device to be operated, on the breaker fault protection starting circuit are checked to be connected with at least one error, and the line connection with the error between the protection function hard pressing plate and the switch relay, which are correspondingly connected with the overcurrent protection device and the selected overcurrent protection contact on the relay protection device to be operated, on the breaker fault protection starting circuit is further adjusted to be correct.

Wherein the method further comprises:

And disconnecting connecting lines between the first relay protection device and the second relay protection device and the failure protection device respectively, loading a test signal to the failure protection device after controlling all over-current protection contacts on the over-current protection device to be closed and a protection function hard pressing plate on the operation box operation loop to enter an input state and at least one relay to be closed, and further checking that all line connections between the failure protection device and the over-current protection device and between the failure protection device and the operation box operation loop are correct if the fact that a test result generated by the test signal loaded to the failure protection device is successful in starting failure is judged.

Wherein the method further comprises:

if the test result generated by the failure protection device loaded with the test signal is judged to be failure in starting, at least one error is checked out in the line connection among the failure protection device, the overcurrent protection device and the operation box operation loop on the circuit breaker failure protection starting loop, and the line connection with the error among the failure protection device, the overcurrent protection device and the operation box operation loop on the circuit breaker failure protection starting loop is further adjusted to be correct.

wherein the method further comprises:

disconnecting a lead with one end connected with a common parallel connection point between the primary I bus disconnecting link and the primary II bus disconnecting link and the other end connected with the failure protection device, controlling the primary I bus disconnecting link to be closed and the primary II bus disconnecting link to be disconnected, and if the fact that the test result generated by the failure protection device loaded with the test signal is continuously maintained as the success of starting failure can be judged, determining that all line connections between the primary I bus disconnecting link and the failure protection device are correct; on the contrary, if the test result generated by judging that the failure protection device is loaded with the test signal is converted from successful start-up failure to failed start-up failure, the fact that the line connection between the primary I bus disconnecting link and the failure protection device has at least one error is determined, and the fact that the line connection between the failure protection device and the primary I bus disconnecting link has the error is adjusted to be correct.

wherein the method further comprises:

controlling the primary I bus disconnecting link to be disconnected and the primary II bus disconnecting link to be closed, and if the test result generated by the failure protection device loaded with the test signal can be continuously maintained as the failure starting success, determining that all the lines between the primary II bus disconnecting link and the failure protection device are correctly connected; on the contrary, if the test result generated by judging that the failure protection device is loaded with the test signal is converted from successful start-up failure to failed start-up, determining that the line connection between the primary II bus disconnecting link and the failure protection device has at least one error, and further adjusting the line connection with the error between the failure protection device and the primary II bus disconnecting link to be correct.

the closing of the switch relays corresponding to the first relay protection device and the second relay protection device is realized by loading corresponding voltage setting values and current setting values on the circuit of each switch relay and the hard pressing plate corresponding to the switch relay and connected with the protection function.

the overcurrent protection device comprises an overcurrent protection device and an overcurrent protection contact, wherein the overcurrent protection device is provided with a plurality of overcurrent protection contacts, and the overcurrent protection contacts are respectively connected with the overcurrent protection device.

The two relays on the operation circuit of the operation box are closed by the action of the protection contact connected with the front end of the operation box.

The embodiment of the invention has the following beneficial effects:

According to the method, firstly, a connection line between a short-circuit failure protection device and a primary I bus disconnecting link and a primary II bus disconnecting link is used, and after a protection action to be realized on a first relay protection device or a second relay protection device is utilized to control an overcurrent protection device to load corresponding overcurrent so as to close corresponding overcurrent protection contacts and load a voltage setting value and a current setting value on the first relay protection device or the second relay protection device so as to close corresponding switch relays, a test result generated by a test signal is loaded on the failure protection device so as to complete line verification between the first relay protection device or the second relay protection device and the overcurrent protection device; secondly, connecting lines between the first relay protection device and the second relay protection device and the failure protection device are disconnected, the overcurrent protection devices are controlled to load corresponding overcurrent to close corresponding overcurrent protection contacts, and after the protection contacts connected with the operation loop end of the operation box are controlled to act to close corresponding relays, the circuit verification between the operation loop of the operation box and the overcurrent protection device is completed through the test result generated by the test signal loaded on the failure protection device; and finally, disconnecting a short-circuit connection line between the failure protection device and the primary I bus disconnecting link and between the failure protection device and the primary II bus disconnecting link, controlling the primary I bus disconnecting link or the primary II bus disconnecting link to be closed, and completing the connection verification between the failure protection device and the primary I bus disconnecting link and the primary II bus disconnecting link by utilizing whether a test result generated by loading a test signal into the failure protection device is continuously maintained as the success of starting failure or not, so that the problems of wiring error or missing connection or damage of a protection function hard pressing plate and the like can be verified on site, thereby timely finding hidden dangers and providing guarantee for the safe operation of the power grid transmission line.

Drawings

in order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is within the scope of the present invention for those skilled in the art to obtain other drawings based on the drawings without creative efforts.

Fig. 1 is a schematic diagram of logical structure connection when a circuit breaker failure protection starting circuit is normal in the prior art;

FIG. 2 is a schematic diagram of the logical structure of the operation circuit of the operation box of FIG. 1;

FIG. 3 is a schematic diagram illustrating a logical structure connection of a corresponding line when the first bus disconnecting link I is closed and the second bus disconnecting link II is opened in FIG. 1;

FIG. 4 is a schematic diagram of the logical connections for the fault protection startup loop of the circuit breaker of FIG. 1;

fig. 5 is a flowchart of a field calibration method for a failure protection starting circuit of a power grid transmission line breaker according to an embodiment of the present invention;

fig. 6 is a schematic diagram of logical structure connection when a relay with a voltage setting value and a current setting value is loaded in a single relay protection device;

Fig. 7 is a schematic connection diagram of a logic structure loaded with an overcurrent in the overcurrent protection device.

Detailed Description

in order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings.

as shown in fig. 5, in an embodiment of the present invention, a field verification method for a failure protection starting circuit of a power grid transmission line breaker is provided, where the field verification method is used for a failure protection starting circuit (as shown in fig. 1) of a breaker including a failure protection device M1, an overcurrent protection device M2, a first relay protection device M3, a second relay protection device M4, an operation box operation circuit M5, a primary I bus disconnecting link 1YQJ, and a primary II bus disconnecting link 2YQJ, and a specific structure of the failure protection starting circuit of the breaker is conventional, please refer to the prior art.

In the embodiment of the invention, the field calibration method for the failure protection starting circuit of the power grid transmission line breaker comprises the following steps:

step S1, when it is determined that the primary I bus disconnecting link and the primary II bus disconnecting link are both in a disconnected state, short circuit is realized by connecting a common parallel connection point between the primary I bus disconnecting link and the primary II bus disconnecting link through one end and connecting a lead of the failure protection device through the other end;

The specific process is that, considering whether the line connection between the primary I bus 1YQJ and the primary II bus 2YQJ and the failure protection device M5 is correct or not, the line connection between the failure protection device M1 and the overcurrent protection device M2, and the line connection between one of the first relay protection device M3, the second relay protection device M4, and the operation box operation loop M5 are correct, and therefore, the short circuit processing is performed on the line between the primary I bus 1YQJ and the primary II bus 2YQJ and the failure protection device M5.

Step S2, after the short circuit is completed, all protection function hard pressing plates on the first relay protection device, the second relay protection device and the operation loop of the operation box are initially in an exit state and all over-current protection contacts on the over-current protection device are initially disconnected, the first relay protection device or the second relay protection device is selected as a to-be-operated relay protection device, and the protection action to be currently realized on the to-be-operated relay protection device is further determined; the protection actions to be realized comprise A-phase single-phase protection actions, B-phase single-phase protection actions, C-phase single-phase protection actions, two-phase protection actions formed by combining any two of ABC three phases and ABC three-phase protection actions;

The specific process is that during the verification, all the protection function hard pressure plates are in an initial exit state and all the overcurrent protection contacts are in an initial disconnection state, so that the misoperation can be reduced. At this time, the first relay protection device M3 or the second relay protection device M4 may be selected as an operation target, that is, the first relay protection device M3 or the second relay protection device M4 may be selected as a to-be-operated relay protection device, and at the same time, a protection operation to be implemented by the to-be-operated relay protection device, such as an a-phase single-phase protection operation, a B-phase single-phase protection operation, a C-phase single-phase protection operation, an AB-phase protection operation, a BC-phase protection operation, an AC-phase protection operation, and an ABC three-phase protection operation, may be selected.

It can be understood that whether the protection action to be currently implemented on the to-be-operated relay protection device can be implemented through the protection state reflected by the to-be-operated relay protection device itself, for example, related information of protection action start is directly displayed on a screen, or a corresponding phase line is lightened by an indicator light to prompt the start of the protection action, and once the reflected protection state comes in or goes out, it indicates that there are problems of wiring errors or missing wiring or damage to a protection function hard pressing plate on the to-be-operated relay protection device.

It should be noted that even if the protection state reflected by the relay protection device to be operated is normally reflected, other states such as multiple connection or short circuit may occur, and therefore further verification is required through the test result of the failure protection device M1.

Step S3, according to the protection action to be realized currently on the relay protection device to be operated, determining that the selected overcurrent protection contact and the selected overcurrent protection contact on the overcurrent protection device are correspondingly connected with the protection function hard pressing plate and the switch relay on the relay protection device to be operated, loading a test signal to the failure protection device after the selected overcurrent protection contact on the overcurrent protection device is controlled to be closed and the protection function hard pressing plate connected with the relay protection device to be operated is switched into a switching state and the switch relay is switched on to start the protection action to be realized currently on the relay protection device to be operated, and further checking that the failure protection device, the selected overcurrent protection contact and the protection device on the circuit breaker failure protection starting circuit are correspondingly connected with the relay protection device to be operated and the selected overcurrent protection contact on the circuit breaker failure protection starting circuit if the test result generated by the fact that the test signal is loaded on the failure protection device is judged to be successful in starting failure All line connections between the protection function hard press plate on the protection device and the switching relay are correct.

the specific process is that firstly, according to the protection action to be realized currently on the relay protection device to be operated, the overcurrent protection contact selected on the overcurrent protection device M2 and the protection function hard pressing plate and the switch relay which are correspondingly connected on the relay protection device to be operated are determined, and the protection action to be realized currently on the relay protection device to be operated is started by controlling the selected overcurrent protection contact of the overcurrent protection device M2 to be closed, and the protection function hard pressing plate which is connected on the relay protection device to be operated to enter an input state and the switch relay to be closed. It should be noted that, the closing of each overcurrent protection contact on the overcurrent protection device M2 is implemented by loading a corresponding overcurrent (as shown in fig. 7), and the closing of the switch relays corresponding to the first relay protection device M3 and the second relay protection device M4 is implemented by loading a corresponding voltage setting value and a corresponding current setting value on a line where each switch relay and a protection function hard pressure plate corresponding to the switch relay are connected (as shown in fig. 6), and at this time, the loading of each phase of overcurrent, the voltage setting value and the current setting value are set according to actual design requirements, which is not described herein again.

In one embodiment, the relay protection device to be operated is a first relay protection device M3, and when the protection action to be currently implemented is an a-phase single-phase protection action, an overcurrent protection contact LJA1 of the overcurrent protection device M2 is selected, and corresponds to a protection function hard pressing plate 1LP9 and a switch relay TJA1 on the first relay protection device M3, and an overcurrent protection contact LJA1 of the overcurrent protection device M2 is closed, and corresponds to a protection function hard pressing plate 1LP9 on the first relay protection device M3, which enters an input state and the switch relay TJA1 is closed;

in another embodiment, the relay protection device to be operated is a first relay protection device M3, and when the current protection action to be realized is taken as an AB two-phase protection action, an overcurrent protection contact LJA1 and an LJB1 of the overcurrent protection device M2 are selected, corresponding to protection function hard pressing plates 1LP9 and 1LP10 and switch relays TJA1 and TJB1 on the first relay protection device M3, the overcurrent protection contact LJA1 and the LJB1 of the overcurrent protection device M2 are both closed, corresponding to protection function hard pressing plates 1LP9 and 1LP10 on the first relay protection device M3, both enter a put-in state, and both the switch relays TJA1 and TJB1 are closed;

in another embodiment, the relay protection device to be operated is a second relay protection device M4, and when the protection action to be currently implemented is a BC two-phase protection action, the overcurrent protection contacts LJB1 and LJC1 of the overcurrent protection device M2 are selected, the overcurrent protection contacts LJB1 and LJC1 of the overcurrent protection device M2 are closed corresponding to the protection function hard pressure plates 2LP10 and 2LP11 and the switch relays TJB2 and TJC2 on the second relay protection device M4, the overcurrent protection contacts LJB1 and LJC1 of the overcurrent protection device M2 are closed corresponding to the protection function hard pressure plates 2LP10 and 2LP11 on the second relay protection device M4 enter the input state, and the switch relays TJB2 and TJC2 are closed;

in another embodiment, the relay protection device to be operated is a second relay protection device M4, and when the protection action to be currently implemented is an ABC three-phase protection action, the overcurrent protection contacts LJA1, LJB1 and LJC1 of the overcurrent protection device M2 are selected, the overcurrent protection contacts LJA1, LJB1 and l3635 of the overcurrent protection device M2 are all closed corresponding to the protection function hard pressing plates 2LP9, 2LP10 and 2LP11 and the switch relays TJA2, TJB2 and TJC2 on the second relay protection device M4, and the overcurrent protection contacts LJA1, LJB1 and LJC1 of the overcurrent protection device M2 are all closed corresponding to the protection function hard pressing plates 2LP9, 2LP10 and 2LP11 on the second relay protection device M4, and the switch relays TJA2, TJB2 and TJC2 are all closed.

Secondly, a test signal is loaded to the failure protection device M1 (designed according to actual requirements), if it is determined that the test result generated by loading the test signal to the failure protection device M1 is that the starting failure is successful, all line connections between the failure protection device M1, the overcurrent protection device M2 and a protection function hard pressing plate of a relay protection device to be operated corresponding to the selected overcurrent protection contact of the overcurrent protection device M2 on the breaker failure protection starting circuit and the switch relay are verified to be correct, and thus wiring errors or missing connections between the overcurrent protection device M2 and the first relay protection device M3 or the second relay protection device M4 can be verified.

it should be noted that, in order to verify on site the problems of wiring errors or missing connections or damage to the hard pressure plate of the protection function occurring on the circuit breaker failure protection starting circuit, steps S1 to S3 may be repeated, and all protection operations of the first relay protection device M3 and all protection operations of the second relay protection device M4 are sequentially verified, so that the problems of wiring errors or missing connections between the overcurrent protection device M2 and the first relay protection device M3 and the second relay protection device M4 can be verified.

of course, a wiring error or a missing wiring between the overcurrent protection device M2 and the first relay protection device M3 or the second relay protection device M4 needs to be further adjusted to be correct to ensure that the line connection of the circuit breaker failure protection starting circuit is normal, so the method further includes:

if the test result generated by the fact that the failure protection device M1 is loaded with the test signal is judged to be failed in starting, all line connections between the protection function hard pressing plate on the relay protection device to be operated and the switch relay on the breaker failure protection starting circuit are verified to have at least one error by checking that the failure protection device M1, the overcurrent protection device M2 and the selected overcurrent protection contact of the circuit breaker failure protection starting circuit correspond to each other, and the line connections with the errors between the protection function hard pressing plate on the relay protection device to be operated and the switch relay on the breaker failure protection starting circuit are further adjusted to be correct by further adjusting the line connections between the failure protection device M1, the overcurrent protection device M2 and the selected overcurrent protection contact of the circuit breaker failure protection starting circuit corresponding to each other.

in the embodiment of the present invention, it is further necessary to verify the problems of wiring error or missing wiring between the overcurrent protection device M2 and the operation loop M5, and at this time, the specific verification method is as follows:

The method comprises the steps of disconnecting connecting lines between a first relay protection device M3 and a second relay protection device M4 and a failure protection device M1, loading a test signal to the failure protection device M1 after controlling all overcurrent protection contacts on the overcurrent protection device M2 to be closed and a protection function hard pressing plate on an operation box operation loop M5 to enter an input state and at least one relay to be closed, and further verifying that all line connections between the failure protection device M1 and the overcurrent protection device M2 on a breaker failure protection starting loop and between the failure protection device M5 on the operation box operation loop are correct if it is determined that a test result generated by the fact that the failure protection device M1 is loaded with the test signal is successful in starting failure. It should be noted that the closing of both relays on the console box operating circuit M5 is realized by the action of the protection contacts connected to the front end of the console box.

in one embodiment, the connection lines between the first relay protection device M3 and the second relay protection device M4 and the failure protection device M1 are disconnected, so that it is ensured that the test signal is the only path passing through the operation box operation loop M5, the control relay TJQ is closed, and if the test result generated by loading the test signal to the failure protection device M1 is that the start failure is successful, it indicates that the lines are normal, that is, all the line connections between the failure protection device M1 and the overcurrent protection device M2 and the operation box operation loop M5 are correct.

of course, the wiring fault or the missing wiring between the overcurrent protection device M2 and the operation box operation loop M5 needs to be further adjusted to be correct to ensure that the line connection of the circuit breaker failure protection starting loop is normal, so the method further comprises the following steps:

if the test result generated by judging that the failure protection device M1 is loaded with the test signal is that the starting failure fails, the line connection among the failure protection device M1 on the breaker failure protection starting circuit, the overcurrent protection device M2 and the operation box operation circuit M5 is verified to have at least one error, and the line connection among the failure protection device M1 on the breaker failure protection starting circuit, the overcurrent protection device M2 and the operation box operation circuit M5 which have errors is further adjusted to be correct.

In the embodiment of the present invention, to verify the problems of wiring error or wiring leakage between the failure protection device M1 and the primary I bus disconnecting link 1YQJ and the primary II bus disconnecting link 2YQJ, it is necessary to perform the verification based on the premise that the line connection between the overcurrent protection device M2 and either the first relay protection device M3 or the second relay protection device M4 is correct in the above steps S1 to S3, the corresponding protection function hard pressure plate on the first relay protection device M3 or the second relay protection device M4 enters the input state, the switch relay is closed, the corresponding overcurrent protection contact of the overcurrent protection device M2 is closed, or the verification based on the premise that the line connection between the overcurrent protection device M2 and the operation box operation circuit M5 is correct, the protection function hard pressure plate on the operation box operation circuit M5 enters the input state, the relay TJQ or TJR is closed, the overcurrent protection contact LJA2, LJB2, or the overcurrent protection contact of the overcurrent protection device M2 is closed, And LJC2 can be realized only under the condition that all LJC2 are closed. At this time, the specific verification method is as follows:

(1) the line connection between the failure protection device M1 and the primary I bus disconnecting link 1YQJ is verified:

disconnecting a common parallel connection point between the primary I bus disconnecting link 1YQJ and the primary II bus disconnecting link 2YQJ connected at one end and a lead of which the other end is connected with the failure protection device M1, controlling the primary I bus disconnecting link 1YQJ to be closed and the primary II bus disconnecting link 2YQJ to be disconnected, and if the test result generated by the failure protection device M1 loaded with the test signal can be judged to be continuously maintained as the success of starting failure, determining that all lines between the primary I bus disconnecting link 1YQJ and the failure protection device M1 are correctly connected; on the contrary, if it is determined that the test result generated by the fault protection device M1 loaded with the test signal is converted from a successful start-up failure to a failed start-up failure, it is determined that there is at least one error in the line connection between the primary I bus switch 1YQJ and the fault protection device M1, and the line connection with the error between the fault protection device M1 and the primary I bus switch 1YQJ is further adjusted to be correct.

(2) the line connection between the failure protection device M1 and the primary II bus disconnecting link 2YQJ is verified:

disconnecting a common parallel connection point with one end connected with the primary I bus disconnecting link 1YQJ and the primary II bus disconnecting link 2YQJ and a lead with the other end connected with the failure protection device M1, controlling the primary I bus disconnecting link 1YQJ to be disconnected and the primary II bus disconnecting link 2YQJ to be closed, and if the fact that the failure protection device M1 is loaded with a test result generated by a test signal and continuously maintains the test result as the success of starting failure can be judged, determining that all lines between the primary II bus disconnecting link 2YQJ and the failure protection device M1 are correctly connected; on the contrary, if it is determined that the test result generated by the fault protection device M1 loaded with the test signal is converted from a successful start-up failure to a failed start-up failure, it is determined that there is at least one error in the line connection between the primary II bus bar switch 2YQJ and the fault protection device M1, and the line connection with the error between the fault protection device M1 and the primary II bus bar switch 2YQJ is further adjusted to be correct.

based on fig. 1, an application scenario of the power grid transmission line breaker failure protection starting circuit field verification method in the embodiment of the present invention is further described:

step 1, putting the protection function hard pressing plates of all devices in an exit state, putting overcurrent protection contacts in a disconnection state, and putting all switch relays and relays in a disconnection state;

step 2, taking the phase A of the first relay protection device M3 as an example, simulating a phase A test, adding an analog quantity test at a A, B, C three-phase current and voltage analog quantity input terminal of a check circuit to close the contact of a switch relay TJA1 in the first relay protection device M3, and adding an analog quantity test at a A, B, C three-phase overcurrent protection terminal to close a corresponding overcurrent protection contact LJA1 in the overcurrent protection device M2;

Step 3, only the protection function hard pressing plate 1LP9 in the first relay protection device M3, and all the rest protection function hard pressing plates are maintained in an exit state;

step 4, simulating the closing of a primary I bus disconnecting link 1YQJ of the line 1 to close the primary I bus disconnecting link 1 YQJ;

Step 5, observing whether a lamp corresponding to the 'starting failure' of the A phase is on or not in the failure protection device M1, if so, indicating that the starting failure corresponding to the A phase is successful, wherein the reason is that after the loop is correctly switched on, the positive potential of the failure protection device M1 passes through a 01 loop to an overcurrent protection contact LJA1, then to a protection function hard pressure plate 1LP9 of the protection 1, then to a switch relay TJA1, then to an I bus disconnecting link 1YQJ for the first time, and finally passes through a 024 loop to the negative end of the failure protection device M1; if not, indicating that the circuit is disconnected and needing to be checked out;

Step 6, verification is carried out, at this time, other protection function hard pressing plates 1LP10 in the first relay protection device M3 corresponding to B and protection function hard pressing plates 1LP11 in the first relay protection device M3 corresponding to C are continuously input, corresponding current and voltage are injected at the same time, so that the switch relays TJB1 and TJC1 in the first relay protection device M3 are closed and corresponding overcurrent protection contacts LJB1 and LJC1 in the overcurrent protection device M2 are closed, and whether the lamp of the failure protection device M1 corresponding to 'failure starting' only appears bright, and other lamps corresponding to 'failure starting' do not appear bright; if other lamps corresponding to the starting failure are on, the circuit is indicated to have a parasitic circuit and needs to be checked out;

Step 7, continuously verifying, namely exiting the protection function hard pressure plate 1LP9 in the first relay protection device M3 at the moment, repeating the tests from the step 2 to the step 3, and if a lamp corresponding to 'starting failure' appears in the failure protection device M1, indicating that a parasitic loop exists in the loop and needing to be checked out;

Step 8, continuously verifying to disconnect the primary I bus disconnecting link 1YQJ, repeating the tests from the step 2 to the step 3, and if the failure protection device M1 has a lamp corresponding to the 'starting failure' A, indicating that a parasitic loop exists in the loop and the loop needs to be checked out;

And 9, simulating the closing of the primary II bus disconnecting link 2YQJ of the circuit, so that the primary II bus disconnecting link 2YQJ is closed.

Step 10, repeating the tests from step 2 to step 3, observing whether a lamp corresponding to the 'starting failure' appears in the failure protection device M1, if the lamp is on, the starting failure corresponding to the phase A succeeds, wherein the reason is that after the loop is correctly switched on, the positive potential of the failure protection device M1 passes through a 01 loop to an overcurrent protection contact LJA1, then to a protection function hard pressure plate 1LP9 of the protection 1, then to a switch relay TJA1, then to a II bus disconnecting link 2YQJ, and finally passes through a 025 loop to the negative end of the failure protection device M1; if not, indicating that the circuit is disconnected and needing to be checked out;

And step 11, disconnecting the primary II bus disconnecting link 2YQJ, repeating the tests from the step 2 to the step 3, and if the failure protection device M1 has a lamp corresponding to the 'starting failure' A, indicating that a parasitic loop exists in the loop and the loop needs to be checked.

it should be noted that, in this analogy, the method of the phase a in the first relay protection device M3 is adopted for the phase B, the phase C, the phase AB, the phase BC, the phase ABC in the first relay protection device M3 and the phase a, the phase B, the phase C, the phase AB, the phase BC, the phase ABC in the first relay protection device M3, and details are not described here.

Taking the relay TJQ as an example, the application scenario of the operation box operation loop M5 is as follows:

firstly, putting protection function hard pressing plates of all devices in an exit state, putting overcurrent protection contacts in a disconnection state, and putting all switching relays and relays in a disconnection state;

Secondly, adding an A, B, C three-phase overcurrent protection terminal to add an analog quantity test to close corresponding overcurrent protection contacts LJA2, LJB2 and LJB3 in the overcurrent protection device M2;

Thirdly, only the protection function hard pressure plate LP in the operation loop M5 of the operation box is put into operation, and the rest pressure plates are all kept in the exit state;

Fourthly, other protection contacts are short-circuited, and after other protection contacts 1 in the operation loop M5 of the operation box start the loop to act, the relay TJQ is closed;

And fifthly, keeping the primary I bus disconnecting link 1YQJ of the simulation line closed, and closing the primary I bus disconnecting link 1 YQJ. Or simulating the closing of the primary II bus disconnecting link 2YQJ of the line, so that the primary II bus disconnecting link 2YQJ is closed;

And sixthly, observing whether the ABC three-phase corresponding start failure lamp of the failure protection device M1 is on or not, wherein if the lamp is on, the reason is that the start failure is successful, after the loop is correctly connected, the positive potential of the failure protection device M1 is connected to an overcurrent protection contact LJA2, an LJB2 and an LJC2 which are connected in series through a 01 loop, then to a protection function hard pressure plate LP, then to a first I bus disconnecting link 1YQJ or a first II bus disconnecting link 2YQJ, and finally to a negative end of the failure protection device M1 through a 024 loop or a 025 loop, and if the circuit is not on, the circuit is disconnected, and the circuit needs to be checked. The result will be recorded

Seventhly, verifying, namely exiting the hard pressure plate LP with the protection function, putting the rest pressure plates in the exit state, repeating the fourth step to the fifth step, and if the starting failure lamp corresponding to the ABC three phases appears in the failure protection device M1, indicating that a parasitic loop exists in the loop and the loop needs to be checked out;

it should be noted that, by analogy, the relay TJR adopts a similar method to the relay TJQ, and the description thereof is omitted here.

The embodiment of the invention has the following beneficial effects:

According to the method, firstly, a connection line between a short-circuit failure protection device and a primary I bus disconnecting link and a primary II bus disconnecting link is used, and after a protection action to be realized on a first relay protection device or a second relay protection device is utilized to control an overcurrent protection device to load corresponding overcurrent so as to close corresponding overcurrent protection contacts and load a voltage setting value and a current setting value on the first relay protection device or the second relay protection device so as to close corresponding switch relays, a test result generated by a test signal is loaded on the failure protection device so as to complete line verification between the first relay protection device or the second relay protection device and the overcurrent protection device; secondly, connecting lines between the first relay protection device and the second relay protection device and the failure protection device are disconnected, the overcurrent protection devices are controlled to load corresponding overcurrent to close corresponding overcurrent protection contacts, and after the protection contacts connected with the operation loop end of the operation box are controlled to act to close corresponding relays, the circuit verification between the operation loop of the operation box and the overcurrent protection device is completed through the test result generated by the test signal loaded on the failure protection device; and finally, disconnecting a short-circuit connection line between the failure protection device and the primary I bus disconnecting link and between the failure protection device and the primary II bus disconnecting link, controlling the primary I bus disconnecting link or the primary II bus disconnecting link to be closed, and completing the connection verification between the failure protection device and the primary I bus disconnecting link and the primary II bus disconnecting link by utilizing whether a test result generated by loading a test signal into the failure protection device is continuously maintained as the success of starting failure or not, so that the problems of wiring error or missing connection or damage of a protection function hard pressing plate and the like can be verified on site, thereby timely finding hidden dangers and providing guarantee for the safe operation of the power grid transmission line.

it will be understood by those skilled in the art that all or part of the steps in the method for implementing the above embodiments may be implemented by relevant hardware instructed by a program, and the program may be stored in a computer-readable storage medium, such as ROM/RAM, magnetic disk, optical disk, etc.

the above disclosure is only for the purpose of illustrating the preferred embodiments of the present invention, and it is therefore to be understood that the invention is not limited by the scope of the appended claims.