阅读说明：本技术 一种交流电源系统保护开关级差配合测试装置 (Alternating current power supply system protection switch level difference cooperation testing arrangement ) 是由 吕小浩 时运瑞 许崇敏 苗国立 江晓利 詹辉 晋毅 陈维慎 李保全 常小亮 于 2019-12-10 设计创作，主要内容包括：本发明提供一种交流电源系统保护开关级差配合测试装置,用于验证各级配电开关在不同短路电流下的级差配合,包括：PLC、脉冲施加端口、驱动回路、可调整电阻组、可调整电容电感组,通过将可调整电阻组、可调整电容电感组接在带有多级配电开关的三相交流电源回路上,通过PLC控制的脉冲施加端口及驱动回路对可调整电阻组、可调整电容电感组进行调整,从而对回路中的电流进行调整,进行级差配合试验；通过设置三相交流接触器,当调整后的电流过大时,断开回路,保证安全；通过设置通讯模块,将PLC所收集到的实验数据上传至网络,便于分析处理。(The invention provides a stage difference coordination testing device for a protection switch of an alternating current power supply system, which is used for verifying the stage difference coordination of distribution switches at all stages under different short-circuit currents and comprises the following components: the adjustable resistance group and the adjustable capacitance inductance group are adjusted through the pulse applying port and the driving circuit controlled by the PLC, so that the current in the loop is adjusted, and a level difference matching test is carried out; by arranging the three-phase alternating current contactor, when the adjusted current is overlarge, a loop is disconnected, and the safety is ensured; through setting up communication module, the experimental data that collects PLC uploads the network, the analysis of being convenient for is handled.)

1. The utility model provides a differential cooperation testing arrangement of AC power supply system protection switch which characterized in that includes: the pulse power supply comprises a PLC, a pulse applying port, a driving loop, an adjustable resistor group and an adjustable capacitor inductor group for adjusting the current and voltage directions, wherein the output end of the PLC is connected with the input end of the pulse applying port, the output end of the pulse applying port is connected with the input end of the driving loop, the output end of the driving loop is respectively connected with the input ends of the adjustable resistor and the adjustable capacitor inductor group, the phase A, the phase B and the phase C of the three-phase power supply are connected with one end of the adjustable capacitor inductor group in series through the adjustable resistors, and the other end of the adjustable capacitor inductor group is connected with the N of the three-phase power supply.

2. The alternating current power supply system protection switch level difference coordination test device according to claim 1, characterized in that: the adjustable resistors comprise a first adjustable resistor, a second adjustable resistor and a third adjustable resistor, and the first adjustable resistor, the second adjustable resistor and the third adjustable resistor are connected in series on the A phase, the B phase and the C phase of the three-phase alternating current power supply.

3. The alternating current power supply system protection switch level difference coordination test device according to claim 1, characterized in that: the adjustable capacitor inductance group comprises a first adjustable inductor, a first adjustable capacitor, a second adjustable inductor, a second adjustable capacitor, a third adjustable inductor and a third adjustable capacitor, wherein one end of the first adjustable inductor and the first adjustable capacitor is connected with the A of the three-phase alternating current power supply in parallel, the other end of the first adjustable inductor and the first adjustable capacitor is connected with the N phase of the three-phase alternating current power supply in parallel, one end of the second adjustable inductor and the second adjustable capacitor is connected with the B of the three-phase alternating current power supply in parallel, the other end of the second adjustable inductor and the second adjustable capacitor is connected with the N phase of the three-phase alternating current power supply in parallel, one end of the third adjustable inductor and the third adjustable capacitor is connected with the C of the three.

4. The alternating current power supply system protection switch level difference coordination test device according to claim 1, characterized in that: the device also comprises a main loop measuring module used for measuring the adjusted voltage and current, the main loop measuring module comprises a first current transformer, a second current transformer, a third current transformer, a first voltage transformer, a second voltage transformer, a third voltage transformer, a measuring loop and an AD conversion module, the first current transformer, the second current transformer and the third current transformer are respectively connected in series on the A phase, the B phase and the C phase between a three-phase power supply and an adjustable resistor, one end of the first voltage transformer is connected with the A phase between the three-phase power supply and the adjustable resistor, the other end of the first voltage transformer is connected with the N phase between the three-phase power supply and the adjustable resistor, one end of the second voltage transformer is connected with the B phase between the three-phase power supply and the adjustable resistor, the other end of the second voltage transformer is connected with the N phase between the three-phase power supply and the adjustable resistor, one end of the third voltage transformer is connected with the C phase between the three-phase power, the other end is connected with the N phase between the three-phase power supply and the adjustable resistor, the output ends of the first current transformer, the second current transformer, the third current transformer, the first voltage transformer, the second voltage transformer and the third voltage transformer are connected with the AD conversion module through the measurement circuit, and the output end of the AD conversion module is connected with the PLC.

5. The AC power supply system protection switch level difference coordination test device according to claim 3, characterized in that: the device also comprises a branch loop measuring module used for measuring the voltage and the current before adjustment, the branch loop measuring module comprises a fourth current transformer, a fifth current transformer, a sixth current transformer, a fourth voltage transformer, a fifth voltage transformer and a sixth voltage transformer, the fourth current transformer, the fifth current transformer and the sixth current transformer are respectively connected with a first adjustable inductor, a second adjustable inductor and a third adjustable inductor in series and then connected with a first adjustable capacitor, a second adjustable capacitor and a third adjustable capacitor in parallel, one end of the fourth voltage transformer is connected with an A phase between the adjustable resistor and the adjustable capacitor inductor group, the other end of the fourth voltage transformer is connected with an N phase between the adjustable resistor and the adjustable capacitor inductor group, one end of the fifth voltage transformer is connected with a B phase between the adjustable resistor and the adjustable capacitor inductor group, the other end of the fifth voltage transformer is connected with the N phase between the adjustable resistor and the adjustable capacitor inductor group, one end of the sixth voltage transformer is connected to the C phase between the adjustable resistor and the adjustable capacitor inductor group, the other end of the sixth voltage transformer is connected to the N phase between the adjustable resistor and the adjustable capacitor inductor group, the output ends of the fourth current transformer, the fifth current transformer, the sixth current transformer, the fourth voltage transformer, the fifth voltage transformer and the sixth voltage transformer are connected with the AD conversion module through the measurement loop, and the output end of the AD conversion module is connected with the PLC.

6. The alternating current power supply system protection switch level difference coordination test device according to claim 1, characterized in that: the three-phase alternating current contactor is arranged on the A phase, the B phase and the C phase between the first current transformer, the second current transformer, the third current transformer and a three-phase alternating current power supply, the input end of the three-phase alternating current contactor is connected with the output end of the driving circuit, and the input end of the driving circuit is connected with the output end of the pulse applying port.

7. The alternating current power supply system protection switch level difference coordination test device according to claim 1, characterized in that: the system further comprises a communication module used for sending the experiment data to a network, and the input end of the communication module is connected with the output end of the PLC.

Technical Field

The invention belongs to the field of matching of the level difference of an alternating-current power supply protection switch, and particularly relates to a matching test device of the level difference of the protection switch of an alternating-current power supply system.

Background

The AC circuit breaker is an important element of an AC system power supply network, the AC circuit breaker in a transformer substation AC power supply system is generally a small-sized air circuit breaker, and is a switch device integrating operation and protection, and has the characteristics of convenient installation and maintenance, flexible operation, high stability and the like, and the AC circuit breaker is widely applied to the transformer substation power supply network, the level difference of the circuit breaker is not matched properly or fails to directly influence the safe power supply of the AC power supply system, and great harm is brought to the safe operation of a power grid, a primary distribution switch, a secondary distribution switch and a tertiary distribution switch are generally arranged on a three-phase AC power supply, the current required by triggering the primary distribution switch is larger than that required by triggering the secondary distribution switch, the current required by triggering the secondary distribution switch is larger than that required by triggering the tertiary distribution switch, for example, the tertiary distribution switch can jump first after reaching a, if the current value reaches the value which enables the secondary distribution switch to jump, the three-level distribution switch and the secondary distribution switch jump simultaneously, the three-level distribution switch and the secondary distribution switch are matched in a level difference mode under different short-circuit currents, but in practical application, the override tripping condition can occur possibly, the condition is that the quality of the distribution switch does not meet the standard or is damaged, the maintenance and replacement are needed by a worker at the moment, but due to the override tripping, the worker can be dangerous during maintenance, and the time is wasted.

Disclosure of Invention

The invention aims to provide a device for testing the matching of the level differences of protection switches of an alternating-current power supply system, which is used for verifying the matching of the level differences of distribution switches at different levels under different short-circuit currents.

The technical scheme for solving the technical problems of the invention is as follows: the utility model provides a protection switch level difference cooperation testing arrangement of AC power supply system, includes: PLC, a pulse applying port, a driving loop, an adjustable resistance group, an adjustable capacitance inductance group for adjusting the current and voltage directions, the output end of the PLC is connected with the input end of a pulse applying port, the output end of the pulse applying port is connected with the input end of a driving loop, the output end of the driving loop is respectively connected with the input ends of the adjustable resistor and the adjustable capacitor inductance group, the phase A, the phase B and the phase C of the three-phase power supply are connected in series with one end of an adjustable capacitance inductance group through an adjustable resistor, the other end of the adjustable capacitance inductance group is connected with N of a three-phase power supply, a command is sent to the pulse applying port through the PLC, the pulse applying port is controlled to send pulses, the adjustable resistance group and the adjustable capacitance inductance group are adjusted through the driving loop, therefore, the current in the loop is adjusted, and the matching of the level difference of each level of distribution switch under different short-circuit currents is verified.

The adjustable resistors comprise a first adjustable resistor, a second adjustable resistor and a third adjustable resistor, and the first adjustable resistor, the second adjustable resistor and the third adjustable resistor are connected in series on the A phase, the B phase and the C phase of the three-phase alternating current power supply.

The adjustable capacitor inductance group comprises a first adjustable inductor, a first adjustable capacitor, a second adjustable inductor, a second adjustable capacitor, a third adjustable inductor and a third adjustable capacitor, wherein one end of the first adjustable inductor and the first adjustable capacitor is connected with the A of the three-phase alternating current power supply in parallel, the other end of the first adjustable inductor and the first adjustable capacitor is connected with the N phase of the three-phase alternating current power supply in parallel, one end of the second adjustable inductor and the second adjustable capacitor is connected with the B of the three-phase alternating current power supply in parallel, the other end of the second adjustable inductor and the second adjustable capacitor is connected with the N phase of the three-phase alternating current power supply in parallel, one end of the third adjustable inductor and the third adjustable capacitor is connected with the C of the three.

In order to measure the adjusted current and voltage, the device also comprises a main loop measuring module used for measuring the adjusted voltage and current, wherein the main loop measuring module comprises a first current transformer, a second current transformer, a third current transformer, a first voltage transformer, a second voltage transformer, a third voltage transformer, a measuring loop and an AD conversion module, the first current transformer, the second current transformer and the third current transformer are respectively connected in series on an A phase, a B phase and a C phase between a three-phase power supply and an adjustable resistor, one end of the first voltage transformer is connected with the A phase between the three-phase power supply and the adjustable resistor, the other end of the first voltage transformer is connected with the N phase between the three-phase power supply and the adjustable resistor, one end of the second voltage transformer is connected with the B phase between the three-phase power supply and the adjustable resistor, and the other end of the second voltage transformer is connected with the N phase between the three-phase power supply and the, one end of the third voltage transformer is connected with a C phase between the three-phase power supply and the adjustable resistor, the other end of the third voltage transformer is connected with an N phase between the three-phase power supply and the adjustable resistor, the output ends of the first current transformer, the second current transformer, the third current transformer, the first voltage transformer, the second voltage transformer and the third voltage transformer are connected with the AD conversion module through the measurement loop, and the output end of the AD conversion module is connected with the PLC.

In order to measure the current and voltage before adjustment, the device also comprises a branch loop measuring module for measuring the voltage and current before adjustment, wherein the branch loop measuring module comprises a fourth current transformer, a fifth current transformer, a sixth current transformer, a fourth voltage transformer, a fifth voltage transformer and a sixth voltage transformer, the fourth current transformer, the fifth current transformer and the sixth current transformer are respectively connected with a first adjustable inductor, a second adjustable inductor and a third adjustable inductor in series and then connected with a first adjustable capacitor, a second adjustable capacitor and a third adjustable capacitor in parallel, one end of the fourth voltage transformer is connected with an A phase between an adjustable resistor and an adjustable capacitor inductor group, the other end of the fourth voltage transformer is connected with an N phase between the adjustable resistor and the adjustable capacitor inductor group, one end of the fifth voltage transformer is connected with a B phase between the adjustable resistor and the adjustable capacitor inductor group, the other end of the third voltage transformer is connected with the N phase between the adjustable resistor and the adjustable capacitor inductor group, one end of the sixth voltage transformer is connected with the C phase between the adjustable resistor and the adjustable capacitor inductor group, the other end of the sixth voltage transformer is connected with the N phase between the adjustable resistor and the adjustable capacitor inductor group, the output ends of the fourth current transformer, the fifth current transformer, the sixth current transformer, the fourth voltage transformer, the fifth voltage transformer and the sixth voltage transformer are connected with the AD conversion module through the measurement loop, and the output end of the AD conversion module is connected with the PLC.

In order to open the loop when the adjustment current is too high, the three-phase alternating current contactor is used for opening the loop when the set voltage current value exceeds a set value, the three-phase alternating current contactor is arranged on the A phase, the B phase and the C phase among the first current transformer, the second current transformer, the third current transformer and the three-phase alternating current power supply, the input end of the three-phase alternating current contactor is connected with the output end of the driving loop, and the input end of the driving loop is connected with the output end of the pulse applying port.

In order to collect and process the experimental data, the system further comprises a communication module used for sending the experimental data to a network, and the input end of the communication module is connected with the output end of the PLC.

The invention has the beneficial effects that: the adjustable resistor group and the adjustable capacitor inductor group are connected to a three-phase alternating current power supply loop with a multistage distribution switch, and the adjustable resistor group and the adjustable capacitor inductor group are adjusted through a pulse applying port and a driving loop controlled by a PLC (programmable logic controller), so that the current in the loop is adjusted, the currents with different sizes required by a step difference test are provided, and the step difference matching test is carried out; by arranging the branch loop measuring module, measuring the current and voltage before adjustment before carrying out a step difference test; measuring the current and voltage adjusted during the level difference test by arranging a main loop measuring module; by arranging the three-phase alternating current contactor, when the adjusted current is overlarge during the level difference test, a loop is disconnected, and the safety is ensured; through setting up communication module, the level difference experimental data that collects PLC uploads to the network, the analysis and processing of being convenient for.

Drawings

Fig. 1 is a schematic diagram of the present invention.

Fig. 2 is a state diagram of the use of the present invention.

Detailed Description

The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

As shown in fig. one, the present invention includes: PLC, a pulse applying port, a driving loop, an adjustable resistance group, an adjustable capacitance inductance group for adjusting the current and voltage directions, the output end of the PLC is connected with the input end of a pulse applying port, the output end of the pulse applying port is connected with the input end of a driving loop, the output end of the driving loop is respectively connected with the input ends of the adjustable resistor and the adjustable capacitor inductance group, the phase A, the phase B and the phase C of the three-phase power supply are connected in series with one end of an adjustable capacitance inductance group through an adjustable resistor, the other end of the adjustable capacitance inductance group is connected with N of a three-phase power supply, a command is sent to the pulse applying port through the PLC, the pulse applying port is controlled to send pulses, the adjustable resistance group and the adjustable capacitance inductance group are adjusted through the driving loop, therefore, the current in the loop is adjusted, and the matching of the level difference of each level of distribution switch under different short-circuit currents is verified.

The adjustable resistors comprise a first adjustable resistor R1, a second adjustable resistor R2 and a third adjustable resistor R3, and the first adjustable resistor R1, the second adjustable resistor R2 and the third adjustable resistor R3 are connected in series to the A phase, the B phase and the C phase of the three-phase alternating-current power supply.

The adjustable capacitor inductance group comprises a first adjustable inductor L1, a first adjustable capacitor C1, a second adjustable inductor L2, a second adjustable capacitor C2, a third adjustable inductor L3 and a third adjustable capacitor C3, wherein one end of the first adjustable inductor L1 and the first adjustable capacitor C1 after being connected in parallel is connected with the A phase of a three-phase alternating current power supply, the other end of the first adjustable inductor L2 and the first adjustable capacitor C1 after being connected in parallel is connected with the N phase of the three-phase alternating current power supply, one end of the second adjustable inductor L2 and the second adjustable capacitor C2 after being connected in parallel is connected with the B phase of the three-phase alternating current power supply, the other end of the second adjustable inductor L3 and the third adjustable capacitor C3 after being connected in parallel are connected with the C phase of the three-phase alternating current power supply.

In order to measure the adjusted current and voltage, the device also comprises a main loop measuring module for measuring the adjusted voltage and current, wherein the main loop measuring module comprises a first current transformer A1, a second current transformer A2, a third current transformer A3, a first voltage transformer V1, a second voltage transformer V2, a third voltage transformer V3, a measuring loop and an AD conversion module, the first current transformer A1, the second current transformer A2 and the third current transformer A3 are respectively connected in series on an A phase, a B phase and a C phase between a three-phase power supply and an adjustable resistor, one end of the first voltage transformer V1 is connected on the A phase between the three-phase power supply and the adjustable resistor, the other end of the first voltage transformer V2 is connected on the B phase between the three-phase power supply and the adjustable resistor, the other end of the second voltage transformer is connected on the N phase between the three-phase power supply and the adjustable resistor, one end of the third voltage transformer V3 is connected with the C phase between the three-phase power supply and the adjustable resistor, the other end is connected with the N phase between the three-phase power supply and the adjustable resistor, the output ends of the first current transformer A1, the second current transformer A2, the third current transformer A3, the first voltage transformer V1, the second voltage transformer V2 and the third voltage transformer V3 are connected with the AD conversion module through the measurement loop, and the output end of the AD conversion module is connected with the PLC.

In order to measure the current and voltage before adjustment, the device further comprises a branch loop measuring module for measuring the voltage and current before adjustment, the branch loop measuring module comprises a fourth current transformer A4, a fifth current transformer A5, a sixth current transformer A6, a fourth voltage transformer V4, a fifth voltage transformer V5 and a sixth voltage transformer V6, the fourth current transformer A4, the fifth current transformer A5 and the sixth current transformer A6 are respectively connected with a first adjustable inductor L1, a second adjustable inductor L2 and a third adjustable inductor L3 in series and then are connected with a first adjustable capacitor C1, a second adjustable capacitor C2 and a third adjustable capacitor C3 in parallel, one end of the fourth voltage transformer V4 is connected with the phase A between an adjustable resistor and an adjustable capacitor inductor group, the other end of the fourth voltage transformer V5 is connected with the phase N between the adjustable resistor and the adjustable capacitor inductor group, one end of the fifth voltage transformer V5 is connected with the phase B between the adjustable resistor and the adjustable capacitor inductor group, the other end of the third voltage transformer V6 is connected with the N phase between the adjustable resistor and the adjustable capacitor inductor group, one end of the sixth voltage transformer V6 is connected with the C phase between the adjustable resistor and the adjustable capacitor inductor group, the other end of the third voltage transformer V6 is connected with the N phase between the adjustable resistor and the adjustable capacitor inductor group, the output ends of the fourth current transformer A4, the fifth current transformer A5, the sixth current transformer A6, the fourth voltage transformer V4, the fifth voltage transformer V5 and the sixth voltage transformer V6 are connected with the AD conversion module through a measurement loop, and the output end of the AD conversion module is connected with the PLC.

In order to open the loop when the regulated current is too high, the three-phase alternating current contactor is further included, and the three-phase alternating current contactor is used for opening the loop when the set voltage current value exceeds a specified value, the three-phase alternating current contactor is arranged on the A phase, the B phase and the C phase between the first current transformer A1, the second current transformer A2 and the third current transformer A3 and a three-phase alternating current power supply, the input end of the three-phase alternating current contactor is connected with the output end of the driving loop, and the input end of the driving loop is connected with the output end of the pulse applying port.

In order to collect and process the experimental data, the system further comprises a communication module used for sending the experimental data to a network, and the input end of the communication module is connected with the output end of the PLC.

When the device is used, the device forms a loop with three phases (A, B, C) and N phases of a three-phase alternating current power supply through a primary distribution switch, a secondary distribution switch, a tertiary distribution switch, a fourth current transformer A4, a fifth current transformer A5, a sixth current transformer A6, a fourth voltage transformer V4, a fifth voltage transformer V5 and a sixth voltage transformer V6 of a branch measuring module respectively measure the current and the voltage of each phase, the current and the voltage are sent to an AD conversion module through the measuring loop, the AD conversion module converts an analog signal into a digital signal and sends the digital signal to a PLC, then the current required by a level difference test is determined (namely the current for triggering the tertiary distribution switch but not triggering the primary distribution switch and the secondary distribution switch), the PLC controls a pulse applying port to send a pulse signal to adjust an adjustable resistance group and an adjustable capacitance inductance group so as to change the current in the loop, the current-voltage after the change is measured through main loop measurement module to send to PLC through measurement circuit, AD conversion module, thereby test the level difference cooperation, the repetition is verified second distribution switch, first distribution switch afterwards, and the data of all experiments all send communication module through PLC, and communication module sends data transmission to the network and is convenient for the analysis.

When the adjusted current is too large, in order to prevent danger, when the current measured by the main loop measuring module reaches a dangerous value, the PLC controls the pulse applying port to send a signal to the three-phase alternating current contactor through the driving loop, and the loop is disconnected.

The adjustable resistor group and the adjustable capacitor inductor group are connected to a three-phase alternating current power supply loop with a multistage distribution switch, and the adjustable resistor group and the adjustable capacitor inductor group are adjusted through a pulse applying port and a driving loop controlled by a PLC (programmable logic controller), so that the current in the loop is adjusted, the currents with different sizes required by a step difference test are provided, and the step difference matching test is carried out; by arranging the branch loop measuring module, measuring the current and voltage before adjustment before carrying out a step difference test; measuring the current and voltage adjusted during the level difference test by arranging a main loop measuring module; by arranging the three-phase alternating current contactor, when the adjusted current is overlarge during the level difference test, a loop is disconnected, and the safety is ensured; through setting up communication module, the level difference experimental data that collects PLC uploads to the network, the analysis and processing of being convenient for.