阅读说明：本技术 一种变电站对时故障定位方法 (Time synchronization fault positioning method for transformer substation ) 是由 周开运 童大中 鲁水林 王博文 吴宏刚 李民 刘志军 于 2021-05-27 设计创作，主要内容包括：本发明公开了一种变电站对时故障定位方法。为了克服现有技术仅能判断变电站时间是否同步,无法确定具体的故障位置或故障原因的问题；本发明包括以下步骤：S1：构建变电站对时系统,对时系统包括依次通信连接的卫星、时钟源、交换机和若干二次设备；S2：变电站二次设备获取卫星时间,进行时间同步；S3：二次设备判断时间同步是否成功,若是,则时间同步结束,若否,则依次分析时间同步过程的各个环节,判断故障位置。本发明依次对时间同步的各个环节进行判断,逐步缩小对时故障的范围,确定具体的故障位置,提高之后的对时故障消缺效率。(The invention discloses a method for positioning time synchronization faults of a transformer substation. The method aims to solve the problems that the prior art can only judge whether the time of the transformer substation is synchronous and cannot determine the specific fault position or fault reason; the invention comprises the following steps: s1: constructing a substation time setting system, wherein the time setting system comprises a satellite, a clock source, a switch and a plurality of secondary devices which are sequentially in communication connection; s2: the secondary equipment of the transformer substation acquires satellite time and performs time synchronization; s3: and the secondary equipment judges whether the time synchronization is successful, if so, the time synchronization is finished, and if not, all links in the time synchronization process are analyzed in sequence to judge the fault position. The invention judges each link of time synchronization in turn, gradually reduces the range of time synchronization faults, determines specific fault positions and improves the subsequent time synchronization fault elimination efficiency.)

1. A method for positioning time setting faults of a transformer substation is characterized by comprising the following steps:

s1: constructing a substation time setting system, wherein the time setting system comprises a satellite, a clock source, a switch and a plurality of secondary devices which are sequentially in communication connection;

s2: the secondary equipment of the transformer substation acquires satellite time and performs time synchronization;

s3: and the secondary equipment judges whether the time synchronization is successful, if so, the time synchronization is finished, and if not, all links in the time synchronization process are analyzed in sequence to judge the fault position.

2. The substation time synchronization fault positioning method according to claim 1, wherein the step S2 includes the steps of:

s21: the clock source acquires satellite time and transmits the acquired satellite time to the switch;

s22: the switch forms different time setting loops through the adaptive communication time setting mode according to the type of the secondary equipment, and time setting is completed through the different time setting loops.

3. A substation time setting fault positioning method according to claim 1 or 2, wherein the communication time setting mode includes a pulse time setting mode, an electro-optical time setting mode and an NTP network time setting mode.

4. The substation time synchronization fault positioning method according to claim 1, wherein the analyzing of each link in the time synchronization process in step S3 sequentially includes secondary device reception fault judgment, switch and secondary device port fault judgment, and time synchronization loop fault judgment between the switch and the secondary device.

5. The substation time synchronization fault positioning method according to claim 4, wherein the step S3 comprises the following steps:

s31: the secondary equipment judges whether a time synchronization signal sent by the switch is received or not and feeds the time synchronization signal back to the switch; if yes, judging no fault, ending, otherwise, entering step S32;

s32: the switch judges whether all secondary devices receive no time synchronization signal according to the feedback; if yes, the process proceeds to step S33, otherwise, it is determined that the receiving port of the secondary device which cannot receive the time synchronization signal is faulty, and the process ends;

if the switch does not receive the feedback of the secondary equipment, judging the time setting loop fault, and ending;

s33: the switch judges whether satellite time sent by a clock source is received or not and sends the satellite time back to the clock source; if yes, the clock is normally sent, the port of the switch is normal, and if not, the step S34 is carried out;

s34: the clock source judges whether the feedback of the port of the switch is received or not; if yes, judging the failure of the receiving port of the switch, and if not, judging the failure of the communication line between the clock source and the switch.

6. The method for positioning time synchronization and fault of substation according to claim 4 or 5, wherein the step S3 further includes determining a fault of the clock source.

7. The substation time synchronization and fault location method according to claim 6, wherein a clock detection tool is used for judging the fault of the clock source, and whether the clock source is faulty or not is judged by detecting the output voltage and frequency.

8. The substation time synchronization and fault location method according to claim 6, wherein the judging of the fault of the clock source comprises the following steps:

after the secondary equipment updates the self time to the synchronous time, the communication with the switch is cut off, and the self-timing of the secondary equipment is started;

at interval time T, the secondary equipment acquires the synchronous time of the time source again and compares the acquired synchronous time with the self-timing time;

judging the deviation between the acquired synchronization time and the self-timing time, finishing if the deviation is within the range of the rated threshold value, judging the fault of the clock source if the deviation is outside the range of the rated threshold value, and feeding the fault back to the switch;

and the switch judges the total number of the received fault feedbacks, and if the total number of the fault feedbacks received by the switch is more than half of the total number of the secondary equipment, the switch judges the fault of the clock source and gives an alarm.

Technical Field

The invention relates to the field of time synchronization and elimination of a transformer substation, in particular to a method for positioning time synchronization faults of the transformer substation.

Background

The power grid system is a time-related system, a breaker and a protection device are required to act for the systematic analysis of operation and accidents of the power grid, time sequences of various events occur, a substation time synchronization system for providing the time sequences is necessary, and each substation is provided with the substation time synchronization system. In an intelligent substation, the time setting precision required by the substation for the time setting system is less than 1us, and the importance of the time setting system is more and more prominent. When merging units are cascaded, each merging unit receives time tick signals of the same time synchronizer, and the abnormal time tick system causes the urgent defect of synchronous abnormal alarm of the merging units. For the line pilot differential protection and the bus differential protection, if a certain merging unit is abnormal in time pair, even protection malfunction may be caused.

At present, when the failure of the time synchronization system of the transformer substation is eliminated, because no special time synchronization system check tool and standard check method exist, whether the synchronous clock source fails is verified, except that whether the device itself has a warning, whether the synchronous clock source is normal or not can only be preliminarily judged by measuring the time synchronization signal voltage, the frequency and the like output by the synchronous clock device through a universal meter. However, this method has a large limitation, and even if the voltage and frequency of the measured time tick signal are normal, the possibility of the failure of the synchronous clock source cannot be eliminated, and this method can only measure the electrical signal and cannot be applied to the measurement of the optical B code time tick signal. For the fault of receiving module type of time setting channel loop or secondary equipment pair, the maintainer can only indirectly locate the fault point by continuously replacing time setting input wiring. When the synchronous clock source or the receiving antenna thereof has a fault, the maintainer has no corresponding spare part or replacing device and cannot process the fault temporarily.

For example, a method and a system for determining synchronization abnormality of a substation time system disclosed in chinese patent literature, whose publication No. CN102946145B, includes the following steps: obtaining an SOE record of a time system of the transformer substation, and reading record time in the SOE record; acquiring the receiving time of an SOE record in a dispatching automation system; comparing the recording time with the receiving time, and judging whether synchronization abnormity occurs; and if the synchronization abnormity occurs, sending alarm information. Correspondingly, the invention also discloses a system for judging the synchronization abnormity of the transformer substation time system. The scheme can only judge whether the time of the transformer substation is synchronous or not, and cannot judge and determine a specific fault position or a fault reason.

Disclosure of Invention

The method mainly solves the problem that the prior art can only judge whether the time of the transformer substation is synchronous and cannot determine the specific fault position or fault reason; the method for positioning the time synchronization fault of the transformer substation is provided, and the position and the reason of the time synchronization fault are accurately positioned.

The technical problem of the invention is mainly solved by the following technical scheme:

a time setting fault positioning method for a transformer substation comprises the following steps:

s1: constructing a substation time setting system, wherein the time setting system comprises a satellite, a clock source, a switch and a plurality of secondary devices which are sequentially in communication connection;

s2: the secondary equipment of the transformer substation acquires satellite time and performs time synchronization;

s3: and the secondary equipment judges whether the time synchronization is successful, if so, the time synchronization is finished, and if not, all links in the time synchronization process are analyzed in sequence to judge the fault position.

Through analyzing each link of the time synchronization process, a specific fault position can be positioned, a specific fault reason is analyzed, the absence elimination of the time synchronization fault is facilitated, and the absence elimination efficiency is improved.

Preferably, the step S2 includes the following steps:

s21: the clock source acquires satellite time and transmits the acquired satellite time to the switch;

s22: the switch forms different time setting loops through the adaptive communication time setting mode according to the type of the secondary equipment, and time setting is completed through the different time setting loops.

And constructing a complete time synchronization system, and acquiring satellite time as the synchronization time of the secondary equipment of the transformer substation. The satellite is GPS or Beidou.

Preferably, the communication time setting mode includes a pulse time setting mode, an electro-optical time setting mode and an NTP network time setting mode. Different types of secondary equipment have different time setting modes.

Preferably, the analyzing of each link in the time synchronization process in step S3 sequentially includes determining a secondary device reception fault, determining a switch and a secondary device port fault, and determining a time synchronization loop fault between the switch and the secondary device. And analyzing and judging each link in sequence, gradually reducing the time synchronization fault range, obtaining a specific fault position, and improving the subsequent time synchronization fault elimination efficiency.

Preferably, the step S3 includes the following steps:

s31: the secondary equipment judges whether a time synchronization signal sent by the switch is received or not and feeds the time synchronization signal back to the switch; if yes, judging no fault, ending, otherwise, entering step S32;

s32: the switch judges whether all secondary devices receive no time synchronization signal according to the feedback; if yes, the process proceeds to step S33, otherwise, it is determined that the receiving port of the secondary device which cannot receive the time synchronization signal is faulty, and the process ends;

if the switch does not receive the feedback of the secondary equipment, judging the time setting loop fault, and ending;

s33: the switch judges whether satellite time sent by a clock source is received or not and sends the satellite time back to the clock source; if yes, the clock is normally sent, the port of the switch is normal, and if not, the step S34 is carried out;

s34: the clock source judges whether the feedback of the port of the switch is received or not; if yes, judging the failure of the receiving port of the switch, and if not, judging the failure of the communication line between the clock source and the switch.

And each link is sequentially judged, the time synchronization fault range is gradually reduced, the specific fault position is determined, and the subsequent time synchronization fault elimination efficiency is improved.

Preferably, the step S3 further includes determining that the clock source is failed. And judging whether the source of the synchronous time has a problem.

Preferably, the clock source fault judgment adopts a clock detection tool, and judges whether the clock source is in fault or not by detecting the output voltage and frequency. Whether the clock source is in fault is judged through voltage and frequency by a clock detection tool such as a universal meter, and the detection mode is simple.

Preferably, the clock source fault determining method includes the following steps:

after the secondary equipment updates the self time to the synchronous time, the communication with the switch is cut off, and the self-timing of the secondary equipment is started;

at interval time T, the secondary equipment acquires the synchronous time of the time source again and compares the acquired synchronous time with the self-timing time;

judging the deviation between the acquired synchronization time and the self-timing time, finishing if the deviation is within the range of the rated threshold value, judging the fault of the clock source if the deviation is outside the range of the rated threshold value, and feeding the fault back to the switch;

and the switch judges the total number of the received fault feedbacks, and if the total number of the fault feedbacks received by the switch is more than half of the total number of the secondary equipment, the switch judges the fault of the clock source and gives an alarm.

And judging whether the synchronous time of the transformer substation has deviation or not, and ensuring the correct synchronous time.

The invention has the beneficial effects that:

1. and each link of time synchronization is judged in sequence, the range of the time synchronization fault is gradually reduced, a specific fault position is determined, and the subsequent time synchronization fault elimination efficiency is improved.

2. And (4) carrying out fault judgment on the clock source, judging whether the synchronous time of the transformer substation has deviation or not, and ensuring that the synchronous time is correct.

Drawings

Fig. 1 is a flowchart of a method for positioning a time tick and a fault of a substation according to the present invention.

Detailed Description

The technical scheme of the invention is further specifically described by the following embodiments and the accompanying drawings.

Example (b):

the method for positioning the time synchronization fault of the substation in the embodiment, as shown in fig. 1, includes the following steps:

s1: and constructing a substation time setting system, wherein the time setting system comprises a satellite, a clock source, a switch and a plurality of secondary devices which are sequentially in communication connection.

And constructing a complete time synchronization system, and acquiring satellite time as the synchronization time of the secondary equipment of the transformer substation.

In this embodiment, the satellite is a GPS or beidou, and the synchronized time is a GPS clock source or beidou clock source.

S2: and the secondary equipment of the transformer substation acquires satellite time and performs time synchronization.

S21: the clock source acquires satellite time and transmits the acquired satellite time to the switch;

s22: the switch forms different time setting loops through the adaptive communication time setting mode according to the type of the secondary equipment, and time setting is completed through the different time setting loops.

The communication time setting mode comprises a pulse time setting mode, an electro-optical time setting mode and an NTP network time setting mode.

Different types of secondary equipment have different time setting modes.

S3: and the secondary equipment judges whether the time synchronization is successful, if so, the time synchronization is finished, and if not, all links in the time synchronization process are analyzed in sequence to judge the fault position.

Analyzing each link of the time synchronization process sequentially comprises secondary equipment receiving fault judgment, switch and secondary equipment port fault judgment and time synchronization loop fault judgment between the switch and the secondary equipment.

S31: the secondary equipment judges whether a time synchronization signal sent by the switch is received or not and feeds the time synchronization signal back to the switch; if so, it is determined that there is no failure, and the process ends, otherwise, the process proceeds to step S32.

S32: the switch judges whether all secondary devices receive no time synchronization signal according to the feedback; if so, the process proceeds to step S33, and if not, it is determined that the reception port of the secondary device that cannot receive the time synchronization signal has failed, and the process ends.

If the exchanger does not receive the feedback of the secondary equipment, the time setting loop fault is judged, and the operation is finished.

S33: the switch judges whether satellite time sent by a clock source is received or not and sends the satellite time back to the clock source; if so, the clock transmission is normal, the switch port is normal, and if not, the process proceeds to step S34.

S34: the clock source judges whether the feedback of the port of the switch is received or not; if yes, judging the failure of the receiving port of the switch, and if not, judging the failure of the communication line between the clock source and the switch.

And each link of the time synchronization process is judged in sequence, the time synchronization fault range is gradually reduced, the specific fault position is determined, and the subsequent time synchronization fault elimination efficiency is improved.

And judging the failure of the clock source. And judging whether the source of the synchronous time has a problem.

The clock source fault judgment comprises the following steps:

after the secondary equipment updates the self time to the synchronous time, the communication with the switch is cut off, and the self-timing of the secondary equipment is started;

at interval time T, the secondary equipment acquires the synchronous time of the time source again and compares the acquired synchronous time with the self-timing time;

judging the deviation between the acquired synchronization time and the self-timing time, finishing if the deviation is within the range of the rated threshold value, judging the fault of the clock source if the deviation is outside the range of the rated threshold value, and feeding the fault back to the switch;

and the switch judges the total number of the received fault feedbacks, and if the total number of the fault feedbacks received by the switch is more than half of the total number of the secondary equipment, the switch judges the fault of the clock source and gives an alarm.

And judging whether the synchronous time of the transformer substation has deviation or not, and ensuring the correct synchronous time.

The failure judgment of the clock source in this embodiment can also adopt a clock detection tool, and judge whether the clock source fails or not by detecting the output voltage and frequency. Whether the clock source is in fault is judged through voltage and frequency by a clock detection tool such as a universal meter, and the detection mode is simple.

The scheme of the embodiment judges each link of time synchronization in sequence, gradually reduces the range of time synchronization faults, determines specific fault positions, and improves the subsequent time synchronization fault elimination efficiency. And (4) carrying out fault judgment on the clock source, judging whether the synchronous time of the transformer substation has deviation or not, and ensuring that the synchronous time is correct.

It should be understood that the examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Further, it should be understood that various changes or modifications of the present invention may be made by those skilled in the art after reading the teaching of the present invention, and such equivalents may fall within the scope of the present invention as defined in the appended claims.