阅读说明：本技术 一种变电站直流系统辅助检验装置 (Auxiliary inspection device for direct current system of transformer substation ) 是由 周烽 周宇 丁航 张长龙 林奕鑫 陈珍 黄智� 吴喆 饶伟洋 尧子雄 于 2020-11-27 设计创作，主要内容包括：本发明实施例公开了一种变电站直流系统辅助检验装置。该变电站直流系统辅助检验装置包括：负载调节模块,负载调节模块包括预设数量的负载支路,各负载支路并联设置于电源接入端之间,负载调节模块通过改变负载支路的闭合数量调节输出负载,其中,电源接入端用于连接直流系统；电流表,串接于负载调节模块与电源接入端之间,电流表用于检测直流系统的输出电流。本实施例通过改变所接入的负载支路的数量来调节负载,实现更宽范围的负载变化,从而在连接直流系统后能够实现更宽范围的电流变化,因而本实施例检测装置能够对不同电流情况下对直流系统的监控单元进行电流精度校验,且可以适应不同容量的直流系统监控单元的电流精度校验。(The embodiment of the invention discloses an auxiliary inspection device for a direct current system of a transformer substation. This supplementary verifying attachment of transformer substation's direct current system includes: the load adjusting module comprises a preset number of load branches, the load branches are arranged between power supply access ends in parallel, the load adjusting module adjusts output loads by changing the closing number of the load branches, and the power supply access ends are used for being connected with a direct current system; and the ammeter is connected between the load adjusting module and the power supply access end in series and is used for detecting the output current of the direct current system. The load is adjusted by changing the number of the accessed load branches, and the load change in a wider range is realized, so that the current change in a wider range can be realized after the direct current system is connected, and therefore, the detection device can perform current precision verification on the monitoring unit of the direct current system under different current conditions, and can adapt to the current precision verification of the monitoring units of the direct current system with different capacities.)

1. The utility model provides a transformer substation's direct current system assists verifying attachment which characterized in that includes:

the load adjusting module comprises a preset number of load branches, each load branch is arranged between power supply access ends in parallel, the load adjusting module adjusts output loads by changing the closing number of the load branches, and the power supply access ends are used for being connected with the direct current system;

and the ammeter is connected between the load adjusting module and the power supply access end in series and is used for detecting the output current of the direct current system.

2. The auxiliary inspection device for the substation direct-current system according to claim 1, wherein each load branch comprises a switch-on/off switch and a connection terminal, the switch-on/off switch is used for controlling the on/off of the load branch, and the connection terminal is used for connecting a resistance module.

3. The substation direct current system auxiliary inspection device of claim 2, wherein the resistance modules comprise a preset number of first resistance modules and a preset number of second resistance modules, and the rated power of the first resistance modules is greater than the rated power of the second resistance modules;

when the current detection precision of the direct current system is verified, the wiring terminal is connected with the first resistance module;

when the insulation detection precision of the direct current system is verified, the wiring terminal is connected with the second resistance module.

4. The substation direct current system auxiliary inspection device of claim 1, further comprising a power switch disposed in parallel between the power inlet and the load regulation module.

5. The substation direct current system auxiliary inspection device of claim 4, further comprising a voltmeter, the voltmeter being arranged in parallel between the power switch and the load regulation module, the voltmeter being configured to detect an output voltage of the direct current system.

6. The substation direct current system auxiliary inspection device of claim 1, further comprising a shorting switch connected between the current meter and the load regulation module, wherein the shorting switch is arranged in parallel with the load regulation module;

the short-circuit switch is used for connecting a preset position of the direct current system during insulation detection so as to simulate the occurrence of ground faults of the direct current system.

7. The substation dc system auxiliary inspection device of claim 1, further comprising a control panel, the control panel comprising a load regulation zone;

the load adjusting area comprises a preset number of switch buttons and a preset number of resistor connecting seats, each switch button correspondingly controls the on-off of one load branch, each resistor connecting seat is correspondingly connected with one load branch, and the resistor connecting seats are used for connecting the resistor modules and connecting the connected resistor modules into the corresponding load branches; the load regulation zone is used for changing the closed number of the load branches in the load regulation module.

8. The substation dc system auxiliary inspection device of claim 7, wherein the control panel further comprises a power button and a short circuit button;

the power supply button is used for being connected with a power supply switch so as to adjust the on-off state of the power supply switch;

and the short circuit button is connected with the short circuit switch to control the on-off state of the short circuit switch.

9. The substation dc system auxiliary inspection device of claim 7, wherein the control panel further comprises a voltage display area and a current display area;

the voltage display area is arranged corresponding to a voltmeter, and the current display area is arranged corresponding to the ammeter.

10. The substation dc system auxiliary inspection device of claim 1, wherein the display accuracy of the ammeter is matched to the display accuracy of a monitoring unit of the dc system.

Technical Field

The embodiment of the invention relates to a direct current measurement technology, in particular to an auxiliary inspection device for a direct current system of a transformer substation.

Background

The direct current equipment of the transformer substation is key equipment of the transformer substation, and the direct current system provides power for protection equipment, automation equipment, switch on-off control and the like in the transformer substation. The monitoring unit of the direct current system is a core part of a monitoring, measuring, signal and management system, comprehensively analyzes various data and information, and controls and manages the whole system. If the analog quantity measurement of the monitoring unit is inaccurate, the stable operation of the direct current system is influenced.

At present, the general method for performing a regular check and acceptance on the current measurement accuracy of the monitoring unit of the dc system is as follows: a slide rheostat or other equipment capable of serving as a load is connected in series, and then the current is measured through a direct current clamp meter and compared with the current displayed by a monitoring unit. The method for checking has the following problems: the resistance value of equipment which can be used as a load is usually fixed, the generated current is not changeable, and the precision comparison and judgment under different current conditions are not facilitated; the low-power slide rheostat generally does not meet the requirements, larger current cannot be generated, and the high-power slide rheostat is larger in volume and weight and inconvenient to transport to a working site, so that field workers are inconvenient to operate.

Disclosure of Invention

The embodiment of the invention provides an auxiliary inspection device for a direct current system of a transformer substation, which is used for improving the working efficiency of acceptance and regular inspection of the direct current system of the transformer substation.

The embodiment of the invention provides a transformer substation direct current system auxiliary inspection device, which comprises:

the load adjusting module comprises a preset number of load branches, each load branch is arranged between power supply access ends in parallel, the load adjusting module adjusts output loads by changing the closing number of the load branches, and the power supply access ends are used for being connected with the direct current system;

and the ammeter is connected between the load adjusting module and the power supply access end in series and is used for detecting the output current of the direct current system.

Optionally, each load branch comprises a switch and a connecting terminal, the switch is used for controlling the on/off of the load branch, and the connecting terminal is used for connecting the resistance module.

Optionally, the resistance modules include a preset number of first resistance modules and a preset number of second resistance modules, and a rated power of the first resistance modules is greater than a rated power of the second resistance modules;

when the current detection precision of the direct current system is verified, the wiring terminal is connected with the first resistance module;

when the insulation detection precision of the direct current system is verified, the wiring terminal is connected with the second resistance module.

Optionally, the power supply further comprises a power switch, and the power switch is arranged between the power supply access end and the load adjusting module in parallel.

Optionally, the dc power supply further comprises a voltmeter, the voltmeter is connected in parallel between the power switch and the load adjusting module, and the voltmeter is used for detecting the output voltage of the dc system.

Optionally, the load regulation system further comprises a short-circuit switch connected between the ammeter and the load regulation module, and the short-circuit switch is connected in parallel with the load regulation module;

the short-circuit switch is used for connecting a preset position of the direct current system during insulation detection so as to simulate the occurrence of ground faults of the direct current system.

Optionally, the system further comprises a control panel, wherein the control panel comprises a load adjusting area;

the load adjusting area comprises a preset number of switch buttons and a preset number of resistor connecting seats, each switch button correspondingly controls the on-off of one load branch, each resistor connecting seat is correspondingly connected with one load branch, and the resistor connecting seats are used for connecting the resistor modules and connecting the connected resistor modules into the corresponding load branches; the load regulation zone is used for changing the closed number of the load branches in the load regulation module.

Optionally, the control panel further comprises a power button and a short circuit button;

the power supply button is used for being connected with a power supply switch so as to adjust the on-off state of the power supply switch;

and the short circuit button is connected with the short circuit switch to control the on-off state of the short circuit switch.

Optionally, the control panel further includes a voltage display area and a current display area;

the voltage display area is arranged corresponding to a voltmeter, and the current display area is arranged corresponding to the ammeter.

Optionally, the display accuracy of the ammeter is matched with the display accuracy of the monitoring unit of the dc system.

The transformer substation direct current system auxiliary inspection device that this embodiment provided constitutes load regulation module through setting up a plurality of load branch roads that are connected in parallel, and every load branch road has certain resistance, like this, through the closed quantity of control load branch road, can change load regulation module's total load value. The direct current system is connected with the detection device through the power supply access end to form a detection loop, so that the output current of the direct current system is adjusted by adjusting the closed number of the load branches, and the output current is adjusted to the required current range. And then, acquiring the output current of the direct current system through the set ammeter, and comparing the current value detected by the ammeter with the current value of the monitoring unit of the direct current system to detect the accuracy of the monitoring unit of the direct current system for current detection so as to verify the current detection precision of the direct current system. The load adjusting module used in this embodiment adjusts the load by changing the number of the accessed load branches, and realizes load change in a wider range, so that current change in a wider range can be realized after the direct current system is connected, and therefore, the detection device of this embodiment can perform current precision verification on the monitoring unit of the direct current system under different current conditions, and can adapt to current precision verification of direct current systems with different capacities.

Drawings

Fig. 1 is a block diagram of a structure of an auxiliary inspection device for a dc system of a substation according to an embodiment of the present invention;

fig. 2 is a block diagram of another auxiliary testing device for a dc system of a substation according to an embodiment of the present invention;

fig. 3 is a schematic panel diagram of an auxiliary inspection device for a dc system of a substation according to an embodiment of the present invention.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.

Fig. 1 is a block diagram of a structure of an auxiliary inspection device for a dc system of a substation according to an embodiment of the present invention, where the inspection device may be used to perform current inspection on the dc system in the substation, so as to inspect the dc system through the detected current value. Referring to fig. 1, the detecting device includes:

the load regulation system comprises a load regulation module 10, wherein the load regulation module 10 comprises a preset number of load branches, each load branch is arranged between power supply access ends in parallel, and the load regulation module 10 regulates output loads by changing the closing number of the load branches, wherein the power supply access ends are used for being connected with a direct current system;

and the ammeter A is connected between the load adjusting module 10 and the power supply access end in series and is used for detecting the output current of the direct current system.

The power supply access end is used for connecting a positive bus and a negative bus of the direct current system so as to establish connection between the detection device and the direct current power supply.

The load adjusting module 10 includes a preset number of load branches, and each load branch is arranged in parallel, so that when the access number of the load branches is different, the load value presented by the load adjusting module 10 is different, and when the access number of the load branches is increased, the load value of the load adjusting module 10 is decreased; conversely, the number of load branches that are switched in decreases, and the load value of the load regulation module 10 increases. In this embodiment, the load adjusting module 10 adjusts the load value by changing the access number of the load branches, and compared with the method of verifying the current precision of the monitoring unit of the direct current system by using a fixed resistance load, the method can realize the current precision with different loads and under the condition of verifying different currents by switching the load branches; compared with a fixed power slide rheostat, the current variable resistor can realize wider current variation, so that the current variable resistor can detect wider current precision, and the acceptance requirement of a direct current system is met.

The ammeter a is disposed between the load adjusting module 10 and the power supply access terminal, and can detect a total output current of the dc system. The current detection result of the ammeter A is compared with the current detection result of the monitoring unit of the direct current system, so that the detection precision of the direct current system is verified.

In this embodiment, the display accuracy of the ammeter a is matched to the display accuracy of the monitoring unit of the dc system. So as to improve the detection precision of the device for the current.

The ammeter A can adopt a digital ammeter A and is powered through a direct current system. In one embodiment, ammeter A employs a four-bit semi-precision meter.

The transformer substation direct current system auxiliary inspection device provided by this embodiment forms load regulation module 10 by setting up a plurality of load branch roads that are connected in parallel, and every load branch road has certain resistance, like this, through the closed quantity of control load branch road, can change load regulation module 10's total load value. The direct current system is connected with the detection device through the power supply access end to form a detection loop, so that the output current of the direct current system is adjusted by adjusting the closed number of the load branches, and the output current is adjusted to the required current range. And then, acquiring the output current of the direct current system through the set ammeter A, and comparing the current value detected by the ammeter A with the current value of the monitoring unit of the direct current system to detect the accuracy of the monitoring unit of the direct current system for current detection so as to verify the current detection accuracy of the direct current system. The load adjusting module 10 used in this embodiment adjusts the load by changing the number of the accessed load branches, and realizes load change in a wider range, so that current change in a wider range can be realized after the dc system is connected, and therefore, the detection device in this embodiment can perform current accuracy verification on the monitoring unit of the dc system under different current conditions, and can adapt to current accuracy verification of dc systems with different capacities. The detachable resistance module is designed, so that the carrying is easy, and the field work is convenient.

Optionally, on the basis of the above embodiment, reference is continued to fig. 1. Each load branch comprises a switch K and a wiring terminal, the switch K is used for controlling the on-off of the load branch, and the wiring terminal is used for connecting the resistance module R.

And each load branch is provided with a switch K, and the on-off state of the load branches is controlled through the switch K, so that the closing quantity of the load branches is adjusted according to detection requirements.

In one embodiment, one end of the on-off switch K is connected to a positive bus, and the other end is connected to a negative bus, wherein the positive bus is connected to the positive electrode of the power supply access terminal, and the negative bus is connected to the negative electrode of the power supply access terminal. When the on-off switch K is closed, the corresponding load branch is closed and is connected to the load adjusting module 10, and the total load of the load adjusting module 10 is reduced; when the on-off switch K is turned off, the corresponding load branch is turned off, and the total load of the load adjusting module 10 is increased. Optionally, in some embodiments, the switching-on/off switch K is an air switch, an incoming line side of the air switch is connected to the positive bus, and an outgoing line side of the air switch is connected to the negative bus, so as to implement switching-on/off control on a load path.

The wiring terminal is used for being connected with the resistor module R, when the resistor module R is connected, the load branch circuit has a corresponding resistance value, and the load branch circuit can be in different load states by replacing the resistor modules R with different resistance values, so that the output current of the direct current system can be adjusted.

The resistor module R in the embodiment adopts the same specification modular design, and can be connected with resistors of different types through the wiring terminal. And through customizing the assorted binding post, can realize that resistance module R can plug and play, through changing resistance module R, can control load regulation module 10 and realize bigger load control range. Meanwhile, the resistor module R in the embodiment is arranged in a detachable and modularized mode, so that the device is easy to carry and convenient to work on site.

It should be noted that the resistor modules R in this embodiment have two different types, one is a resistor module with high power and small resistance, and the other is a resistor module with low power and large resistance. When the current precision is detected, the resistor module with high power and small resistance is adopted, so that the device can detect the current precision in a wider range.

If the insulation monitoring unit of the direct current system cannot reliably reflect the ground fault of the direct current system, the switch of the transformer substation may be failed or malfunction. Therefore, when the dc system is checked, the insulation monitoring function of the dc system needs to be checked. In order to implement ground fault detection on the dc system, the detection apparatus of this embodiment further has a ground fault detection function. The ground fault detection of the device of the present embodiment will be further described with reference to the accompanying drawings.

Optionally, fig. 2 is a block diagram of a structure of another substation dc system auxiliary inspection device provided in the embodiment of the present invention. On the basis of the above embodiment, reference is made to fig. 2. The detection device also comprises a short-circuit switch Km connected between the ammeter A and the load adjusting module 10, and the short-circuit switch Km is connected with the load adjusting module 10 in parallel;

the short-circuit switch Km is used for connecting a preset position of a direct current system during insulation detection so as to simulate the occurrence of ground faults of the direct current system.

When the direct current system ground fault is detected, two connecting terminals of the short-circuit switch Km are connected between the positive and negative electrode buses of the direct current system and the ground or between the branch feeder line and the ground according to fault simulation requirements so as to simulate the occurrence of ground fault of the direct current system.

At this time, the short-circuit switch Km bypasses the ammeter a and the voltmeter, and only the load adjusting module 10 is connected, so that whether the insulation detection function of the dc system is normal when the dc system has a ground fault is detected by comparing the resistance value detected by the dc system with the resistance value of the currently-connected resistance module R.

It should be noted that, in the embodiment, although both the current measurement accuracy and the insulation monitoring function are tested by serially connecting resistors, the types of resistors required are different, and refer to the description of the following embodiments.

The resistor module R in the embodiment adopts the modular design of the same resistor specification, so that different types of resistors can be connected in series in each load branch, the current measurement precision and the insulation monitoring function inspection tool are integrated, and the function expansion of the calibration device is realized.

Optionally, on the basis of the above embodiment, reference is continued to fig. 2. The resistor modules R comprise a preset number of first resistor modules and a preset number of second resistor modules, and the rated power of the first resistor modules is greater than that of the second resistor modules;

when the current detection precision of the direct current system is verified, the connecting terminal is connected with the first resistance module;

when the insulation detection precision of the direct current system is verified, the wiring terminal is connected with the second resistance module.

The rated power of the first resistance module is larger than that of the second resistance module, so that when the detection accuracy of the monitoring unit of the direct current system to the current is detected, the accuracy detection needs to be carried out on the current in different ranges, the first resistance module can bear larger current, and the current accuracy detection requirement of the direct current system is met.

When the insulation detection precision of the direct current system is verified, the insulation monitoring unit of the direct current system directly detects the corresponding resistance value, the second resistance module, namely the low-power large-resistance resistor is used for simulating the ground fault, whether the insulation monitoring unit of the direct current system can correctly measure the resistance value of the series resistor and correctly judge which branch feeder line has the ground fault is detected, and therefore the second resistance module can meet the insulation precision detection requirement.

In this embodiment, although the types of the first resistance module and the second resistance module are different, since the first resistance module and the second resistance module both adopt the same specification modular design, the detection apparatus provided in this embodiment can implement the current precision test on the dc system and the ground fault test on the dc system by replacing the resistance module R connected to each load branch in the load adjusting module 10.

Optionally, on the basis of the above embodiment, reference is continued to fig. 2. The detection device further comprises a power switch, and the power switch K0 is arranged between the power supply access end and the load adjusting module 10 in parallel.

The power switch K0 is disposed in parallel at two ends of the load adjusting module 10, and is connected between the power input end and the load adjusting module 10. The power switch K0 is used for carrying out on-off control on an output loop of the direct current system, when the power switch K0 is switched off, a direct current bus of the detection device is powered off, and at the moment, an operator can detect or carry out other operations on the device, so that the safety of the detection device is ensured.

When current precision detects, control switch K0 switches on, and load regulation module 10 is switched into the direct current system this moment, and through changing different first resistance modules for the load branch road in load regulation module 10, let load regulation module 10 present different resistances, realize carrying out the precision to different current values and detect.

Optionally, on the basis of the above embodiment, reference is continued to fig. 2. The detection device further comprises a voltmeter, the voltmeter is connected in parallel and arranged between the power switch K0 and the load regulation module 10, and the voltmeter is used for detecting the output voltage of the direct current system.

Wherein, the voltmeter sets up between switch K0 and load regulation module 10 to set up with load regulation module 10 parallel, make the voltmeter can detect direct current system's output voltage, like this, when carrying out the current accuracy check to direct current system, operating personnel accessible voltmeter directly reads direct current system's output voltage, makes things convenient for operating personnel to master direct current system current detection precision under different output voltage.

For example, the voltmeter in the present embodiment may be a digital voltmeter, and the voltmeter is directly powered by the dc system. In one specific embodiment, the voltmeter is a 4-bit semi-precision meter.

Optionally, fig. 3 is a schematic panel diagram of the auxiliary inspection device for the dc system of the substation according to the embodiment of the present invention. Referring to fig. 3, the detection apparatus further includes a control panel including a load regulation zone;

the load adjusting area comprises a preset number of switch buttons and a preset number of resistor connecting seats, each switch button correspondingly controls the on-off of one load branch, each resistor connecting seat is correspondingly connected with one load branch, and the resistor connecting seats are used for connecting the resistor modules and connecting the connected resistor modules into the corresponding load branches; the load regulation zone is used for changing the closed number of load branches in the load regulation module.

Wherein the load adjusting region is provided corresponding to the load adjusting module to adjust a load value of the auxiliary verifying unit through the load adjusting region of the control panel. The load regulation district includes shift knob and resistance connecting seat, and shift knob wherein is corresponding to the load branch road setting, specifically, shift knob is corresponding to the divide-shut switch setting of load branch road to through the divide-shut switch that shift knob control corresponds. When the switch button is pressed down, the corresponding on-off switch is closed, and when the switch button is reset, the corresponding on-off switch is opened.

The resistance connecting seat connects the resistance module to the resistance module access who will connect corresponds load branch road, particularly, the resistance connecting seat sets up corresponding to the binding post of load branch road, and a binding post is connected to every resistance connecting seat, and the resistance module passes through the resistance connecting seat and is connected with corresponding binding post. Therefore, in the checking process, the resistance modules arranged in the same specification can be used in a plug-and-play mode, and the resistance modules can be quickly replaced. The operation of the operator on the spot is convenient.

Optionally, on the basis of the above embodiment, reference is continued to fig. 3. The control panel also comprises a power button and a short circuit button;

the power supply button is used for being connected with the power supply switch so as to adjust the on-off state of the power supply switch;

the short circuit button is connected with the short circuit switch to control the on-off state of the short circuit switch.

The power button is connected with the power switch, and a user can connect the device into a direct current system or disconnect the device from the direct current system by operating the power button.

The short-circuit button is used for controlling the on-off of the short-circuit switch, when the short-circuit button is pressed down, the short-circuit switch is turned on, and at the moment, the ground fault of the direct current system can be verified; when the ground fault check of the dc system is finished, the shorting button is released, at which time the shorting switch is opened.

In one embodiment, the power switch and the short-circuit switch are both air switches. The inlet wire side of the air switch is connected with the positive bus, and the outlet wire side of the air switch is connected with the negative bus, so that the state control of the power switch and the short-circuit switch is realized.

Optionally, on the basis of the above embodiment, reference is continued to fig. 3. The control panel also comprises a voltage display area and a current display area;

the voltage display area is arranged corresponding to the voltmeter, and the current display area is arranged corresponding to the ammeter.

For example, a transparent area may be disposed at a position of the control panel corresponding to the voltmeter and the ammeter to display a voltage value of the voltmeter and a current value of the ammeter through the transparent area. Or gaps are directly arranged in the display area of the voltmeter and the display area of the ammeter, so that the display area of the voltmeter and the display area of the ammeter are exposed out of the control panel, and the operation personnel can read the control panel conveniently. Of course, the setting modes of the voltage display area and the current display area can be flexibly changed according to the needs, and this embodiment does not limit this.

It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.