Power distribution network real model test device

Abstract

The utility model provides a real-model test device for a power distribution network, which comprises a fault grounding simulation device and a first switch control unit electrically connected with the fault grounding simulation device. The first switch control unit comprises a master control switch, a first branch switch, a second branch switch, a first selection switch, a second selection switch and a first phase control switch group; the master control switch is arranged in a current path of one phase line of the first test sample; the first phase control switch group comprises three phase control switches which are electrically connected between the three phase lines of the first test sample and the second branch switch respectively, and the second branch switch is electrically connected with the fault grounding simulation device. According to the test device, the conventional single-phase grounding fault test can be carried out, and other complex types of grounding fault tests of a power supply side, a load side and the like after single-phase disconnection can also be carried out, and a test circuit does not need to be rebuilt, so that the flexibility and the efficiency of the test are greatly improved, and the test cost is remarkably reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of distribution network full-scale test, in particular to a distribution network full-scale test device. Background Art

[0002] As a basic link of the power system, the stability and reliability of the distribution network have a decisive impact on the power supply quality. With the continuous growth of the society's demand for low-carbon environmental protection and intelligent technologies, the distribution network technology is also undergoing profound changes. In recent years, the rapid development of new technologies and new equipment such as low-carbon environmental protection equipment for distribution networks, primary and secondary integrated equipment, distribution intelligent terminal equipment, distribution Internet of Things and digitization, and distribution network intelligent fault self-healing has promoted the transformation of the distribution network towards low-carbon, digital, and intelligent directions.

[0003] The construction of intelligent distribution network laboratories, especially the construction of distribution network full-scale test and empirical capabilities, has become an important field of power system research. The distribution network full-scale test and empirical technology plays an irreplaceable role in the research on the application of new distribution network technologies and new equipment. Compared with traditional dynamic simulation and digital simulation test technologies, the distribution network full-scale test can reproduce the actual operating environment of the distribution network to the greatest extent, so as to efficiently, truly, and safely test the functions and performances of equipment, and provide an effective test means for the research on the complex characteristics of new distribution networks.

[0004] However, the existing distribution network full-scale test systems can often only conduct single-type grounding fault tests. For example, they can only conduct single-phase grounding fault tests, and cannot conduct complex-type grounding fault tests such as various situations related to single-phase disconnection. If tests of the above complex fault types are required, the existing systems need to rebuild the test circuit, which not only takes time and effort, but also significantly increases the test cost and reduces the test efficiency. Summary of the Utility Model

[0005] The purpose of the utility model is to provide a distribution network full-scale test device that can test different types of grounding faults through a set of test circuits, thereby improving the test flexibility and efficiency.

[0006] To achieve the above purpose, the utility model provides a distribution network full-scale test device, which includes a fault grounding simulation device and a first switch control unit electrically connected to the fault grounding simulation device. The fault grounding simulation device is used to simulate and output several grounding fault signals, and the first switch control unit is used to be electrically connected to a first test sample connected to the distribution network;

[0007] The first switch control unit includes a master control switch, a first branch switch, a second branch switch, a first selection switch, a second selection switch, and a first phase control switch group;

[0008] The master control switch is arranged in the current path of one of the phase lines of the first test sample, and is used to start or shut down the first test sample;

[0009] One end of the master control switch close to the first test sample is electrically connected to the fault grounding simulation device through the first selection switch and the first branch switch, and one end of the master control switch close to the load is electrically connected to the fault grounding simulation device through the second selection switch and the first branch switch;

[0010] The first phase control switch group includes three phase control switches respectively electrically connected between the three phase lines of the first test sample and the second branch switch, and the second branch switch is electrically connected to the fault grounding simulation device.

[0011] Preferably, it further includes a second switch control unit, which is used to be electrically connected to a second test sample connected to the distribution network. The second switch control unit includes a second phase control switch group and a third branch switch. The second phase control switch group includes three phase control switches respectively electrically connected between the three phase lines of the second test sample and the third branch switch, and the third branch switch is electrically connected to the fault grounding simulation device.

[0012] Preferably, it further includes an operation terminal and a controller communicatively connected to the operation terminal. The controller is electrically connected to the fault grounding simulation device, the first switch control unit and the second switch control unit.

[0013] Preferably, the operation terminal is electrically connected to the controller through a wireless communication module.

[0014] Preferably, the first switch control unit further includes a first load selection switch and a first load resistor arranged on each phase line corresponding to the first test sample. The first load selection switch is used to control the connection or disconnection of the first load resistor and the corresponding phase line; the second switch control unit further includes a second load selection switch and a second load resistor arranged on each phase line corresponding to the second test sample. The second load selection switch is used to control the connection or disconnection of the second load resistor and the corresponding phase line.

[0015] Preferably, the first switch control unit further includes a first capacitor selection switch and a first load capacitor provided on each phase line corresponding to the first test sample, where the first capacitor selection switch is used to control the connection or disconnection of the first load capacitor to the corresponding phase line; the second switch control unit further includes a second capacitor selection switch and a second load capacitor provided on each phase line corresponding to the second test sample, where the second capacitor selection switch is used to control the connection or disconnection of the second load capacitor to the corresponding phase line.

[0016] Preferably, it further includes a circuit breaker, and the first test sample and the second test sample are electrically connected to the power distribution network through the circuit breaker.

[0017] Preferably, it further includes an isolation transformer, and the circuit breaker is electrically connected to the power distribution network through the isolation transformer.

[0018] Preferably, the controller includes a timing controller and a logic operation controller. The timing controller is electrically connected to the circuit breaker, the master control switch, the first branch switch, the second branch switch, and the third branch switch; the logic operation controller is electrically connected to the first selection switch, the second selection switch, the first phase control switch group, and the second phase control switch group.

[0019] Compared with the prior art, the power distribution network full-scale test device provided by the above technical solution of the present invention includes a fault grounding simulation device and a first switch control unit. Through the configuration of the specific switch structure of the first switch control unit and based on the control of the states of different switches, in addition to performing conventional single-phase grounding fault tests, it can also perform other complex types of grounding fault tests such as power supply side and load side after single-phase disconnection, and there is no need to rebuild the test circuit, which greatly improves the flexibility and efficiency of the test and significantly reduces the test cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is the circuit schematic diagram of the test device in one embodiment of the present invention.

[0021] Figure 2 It is the circuit schematic diagram of the test device in another embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] To describe in detail the technical content, structural features, achieved objectives, and effects of the present invention, the following is described in detail in conjunction with the embodiments and with reference to the accompanying drawings.

[0023] This embodiment discloses a true-type test device for a distribution network, which is used to test and detect the performance of equipment in the distribution network of a power system through a real distribution network. Specifically, the device includes first and second integrated equipment, as well as distribution equipment with other functions.

[0024] As Figure 1 , the test device includes a fault grounding simulation device U and a first switch control unit electrically connected to the fault grounding simulation device U. The fault grounding simulation device U is used to simulate and output several types of grounding fault signals. For example, metallic grounding, grounding through a resistor, grounding through cable arc, and grounding fault signals of other grounding types. The first switch control unit is used to be electrically connected to a first test sample Y1 connected to the distribution network W. In this embodiment, for the fault grounding simulation device U, it is a well-known and mature device in the art. Therefore, its specific composition and working principle will not be elaborated here.

[0025] For the first switch control unit, it includes a master control switch K1, a first branch switch K2, a second branch switch K3, a first selection switch G1, a second selection switch G2, and a first phase control switch group.

[0026] The master control switch K1 is arranged in the current path of one of the phase lines of the first test sample Y1 and is used to start or stop the first test sample Y1. That is, when conducting any type of grounding fault test, this master control switch K1 must be closed first.

[0027] One end of the master control switch K1 close to the first test sample Y1 is electrically connected to the fault grounding simulation device U through the first selection switch G1 and the first branch switch K2, and one end of the master control switch K1 close to the load is electrically connected to the fault grounding simulation device U through the second selection switch G2 and the first branch switch K2.

[0028] The first phase control switch group includes three phase control switches G3, G4, and G5 respectively electrically connected between the three phase lines of the first test sample Y1 and the second branch switch K3. The second branch switch K3 is electrically connected to the fault grounding simulation device U.

[0029] Specifically, the three phase lines are phase A, phase B, and phase C. Among them, one phase control switch G3 of the first phase control switch group is connected between phase A and the second branch switch K3, another phase control switch G4 of the first phase control switch group is connected between phase B and the second branch switch K3, and another phase control switch G5 of the first phase control switch group is connected between phase C and the second branch switch K3. And one end of the second branch switch K3 is electrically connected to the fault grounding simulation device U, and the other end is electrically connected to the three phase control switches.

[0030] The working principle of the above switch control unit will be described in detail below.

[0031] 1. If a single-phase grounding fault test is to be carried out, then:

[0032] The main control switch K1 is closed;

[0033] Select the test phase to be carried out. If it is phase A, then the phase control switch G3 is closed. If it is phase B, then the phase control switch G4 is closed. If it is phase C, then the phase control switch G5 is closed;

[0034] Control the action time of the second branch switch K3, and the grounding fault signal output by the fault grounding simulation device U can be introduced into the selected phase wire, thereby controlling the occurrence time of the grounding fault.

[0035] 2. If a single-phase open circuit without grounding fault test is to be carried out, then:

[0036] The main control switch K1 is closed, and all other switches are in the off state;

[0037] During the test, control the action time of the main control switch K1, that is, control the occurrence time of the open circuit.

[0038] 3. If a single-phase open circuit followed by a grounding fault on the power supply side test is to be carried out, then:

[0039] The main control switch K1 is closed, and the first selection switch G1 is closed;

[0040] During the test, respectively control the action time of the main control switch K1 and the first branch switch K2 to control the occurrence time of the open circuit and the occurrence time of the grounding fault;

[0041] 4. If a single-phase open circuit followed by a grounding fault on the load side test is to be carried out, then:

[0042] The main control switch K1 is closed, and the second selection switch G2 is closed. During the test, respectively control the action time of the main control switch K1 and the first branch switch K2 to control the occurrence time of the open circuit and the occurrence time of the grounding fault.

[0043] It can be seen that through the configuration of the specific switch structure of this first switch control unit, based on the control of the states of different switches, in addition to carrying out the conventional single-phase grounding fault test, other complex types of grounding fault tests such as single-phase open circuit followed by grounding faults on the power supply side and load side can also be carried out, and there is no need to rebuild the test circuit, which greatly improves the flexibility and efficiency of the test and significantly reduces the test cost.

[0044] On the other hand, as Figure 2, the test device in this embodiment further includes a second switch control unit. The second switch control unit is used to be electrically connected to a second test sample Y2 connected to the distribution network W. The second switch control unit includes a second phase-controlled switch group and a third branch switch K4. The second phase-controlled switch group includes three phase-controlled switches G6, G7, and G8 respectively electrically connected between the three-phase lines of the second test sample and the third branch switch K4. The third branch switch K4 is electrically connected to the fault grounding simulation device U. In this embodiment, the second test sample Y2 and the first test sample Y1 are of the same type of power distribution equipment. For example, they are first and second integrated equipment of the same model.

[0045] Based on the setting of the second switch control unit, more complex grounding fault tests can also be carried out. For example:

[0046] 5. If a single-phase grounding fault test with successive faults of the same name is to be carried out, then:

[0047] For example, when carrying out a single-phase grounding fault test with successive faults of the same name as A, the main control switch K1 is closed, and the phase-controlled switches G3 and G6 are closed. During the test process, the action times of the second branch switch K3 and the third branch switch K4 are respectively controlled to control the occurrence time of the successive grounding fault.

[0048] 6. If a single-phase grounding fault test with successive faults of different names is to be carried out, then:

[0049] For example, when carrying out a single-phase grounding fault test with successive faults of different names between phases A / B, the main control switch K1 is closed, and the phase-controlled switches G3 and G7 are closed;

[0050] During the test process, the action times of the second branch switch K3 and the third branch switch K4 are respectively controlled to determine the occurrence time of the successive grounding fault.

[0051] On the other hand, the first switch control unit further includes a first load selection switch G10 and a first load resistor R1 provided on each phase line corresponding to the first test sample Y1. The first load selection switch G10 is used to control the connection or disconnection of the first load resistor R1 and the corresponding phase line. The second switch control unit further includes a second load selection switch G12 and a second load resistor R2 provided on each phase line corresponding to the second test sample Y2. The second load selection switch G12 is used to control the connection or disconnection of the second load resistor R2 and the corresponding phase line.

[0052] In addition, the first switch control unit further includes a first capacitor selection switch G9 and a first load capacitor C1 disposed on each phase line corresponding to the first test sample Y1. The first capacitor selection switch G9 is used to control the connection or disconnection of the first load capacitor C1 to the corresponding phase line. The second switch control unit further includes a second capacitor selection switch G11 and a second load capacitor C2 disposed on each phase line corresponding to the second test sample Y2. The second capacitor selection switch G11 is used to control the connection or disconnection of the second load capacitor C2 to the corresponding phase line.

[0053] In this embodiment, through the first load selection switch G10, the first load resistor R1, the second load selection switch G12, the second load resistor R2, and: the first capacitor selection switch G9 and the first load capacitor C1, the second capacitor selection switch G11 and the second load capacitor C2. When performing various ground fault tests, the required load resistors and load capacitors can be configured for the first test sample Y1 and the second test sample Y2.

[0054] On the other hand, the test device in this embodiment further includes an operation terminal UE and a controller S communicatively connected to the operation terminal UE. The controller S is electrically connected to the fault grounding simulation device U, the first switch control unit, and the second switch control unit. In this embodiment, through the settings of the operation terminal UE and the controller S, automatic control of each switch in the first switch control unit and the second switch control unit can be realized, which is convenient for operation.

[0055] Further, the operation terminal UE is electrically connected to the controller S through a wireless communication module (not shown in the figure) to realize remote operation of the test process.

[0056] In another embodiment, the test device further includes a circuit breaker QF and an isolation transformer ZT. The first test sample Y1 and the second test sample Y2 are electrically connected to the distribution network W through the circuit breaker QF. The circuit breaker QF is electrically connected to the distribution network W through the isolation transformer ZT.

[0057] In yet another embodiment, the controller S includes a timing controller S1 and a logic operation controller S2 (such as a PLC controller). The timing controller S1 is electrically connected to the circuit breaker QF, the main control switch K1, the first branch switch K2, the second branch switch K3, and the third branch switch K4. The logic operation controller S2 is electrically connected to the first selection switch G1, the second selection switch G2, the first phase control switch group, the second phase control switch group, and the first load selection switch G10, the second load selection switch G12, the first capacitor selection switch G9, and the second capacitor selection switch G11.

[0058] In this embodiment, through the differential settings of the timing controller S1 and the logical operation controller S2, the configuration of the control program can be optimized, making the configuration of the controller S simpler.

[0059] The above-disclosed are only the preferred embodiments of the present utility model. Of course, the scope of rights of the present utility model cannot be limited thereby. Therefore, equivalent changes made according to the scope of the patent application of the present utility model still fall within the scope covered by the present utility model.

Claims

1. A distribution network real test device, characterized in that: It comprises a fault grounding simulation device and a first switch control unit electrically connected to the fault grounding simulation device, wherein the fault grounding simulation device is used to simulate and output several types of grounding fault signals, and the first switch control unit is used to be electrically connected to a first test sample connected to a power distribution network; The first switch control unit includes a master control switch, a first branch switch, a second branch switch, a first selection switch, a second selection switch and a first phase-controlled switch group; The master control switch is arranged in the current path of one of the phase lines of the first test sample, and is used to start or shut down the first test sample; One end of the master switch close to the first test sample is electrically connected to the fault grounding simulation device through the first selection switch and the first branch switch, and one end of the master switch close to the load is electrically connected to the fault grounding simulation device through the second selection switch and the first branch switch; The first phase-controlled switch group includes three phase-controlled switches electrically connected between three phase lines of the first test sample and the second branch switch, respectively, and the second branch switch is electrically connected to the fault grounding simulation device.

2. The distribution network real-type test device according to claim 1 is characterized in that: It also includes a second switch control unit, which is used to be electrically connected to a second test sample connected to the power distribution network. The second switch control unit includes a second phase-controlled switch group and a third branch switch. The second phase-controlled switch group includes three phase-controlled switches electrically connected between the three phase lines of the second test sample and the third branch switch, and the third branch switch is electrically connected to the fault grounding simulation device.

3. The distribution network real-type test device according to claim 2 is characterized in that: It also includes an operation terminal and a controller that is communicatively connected to the operation terminal, and the controller is electrically connected to the fault grounding simulation device, the first switch control unit, and the second switch control unit.

4. The distribution network real-type test device according to claim 3 is characterized in that: The operation terminal is electrically connected to the controller via a wireless communication module.

5. The distribution network real-type test device according to claim 2 is characterized in that: The first switch control unit also includes a first load selection switch and a first load resistor arranged on each phase line corresponding to the first test sample, and the first load selection switch is used to control the first load resistor to be connected or disconnected with the corresponding phase line; the second switch control unit also includes a second load selection switch and a second load resistor arranged on each phase line corresponding to the second test sample, and the second load selection switch is used to control the second load resistor to be connected or disconnected with the corresponding phase line.

6. The distribution network real-type test device according to claim 2 is characterized in that: The first switch control unit also includes a first capacitor selection switch and a first load capacitor arranged on each phase line corresponding to the first test sample, and the first capacitor selection switch is used to control the first load capacitor to be connected or disconnected with the corresponding phase line; the second switch control unit also includes a second capacitor selection switch and a second load capacitor arranged on each phase line corresponding to the second test sample, and the second capacitor selection switch is used to control the second load capacitor to be connected or disconnected with the corresponding phase line.

7. The distribution network real-type test device according to claim 2 is characterized in that: It also includes a circuit breaker, and the first test sample and the second test sample are electrically connected to the power distribution network through the circuit breaker.

8. The distribution network real-type test device according to claim 7, characterized in that: It also includes an isolation transformer, and the circuit breaker is electrically connected to the power distribution network through the isolation transformer.

9. The distribution network real-type test device according to claim 3, characterized in that: It also includes a circuit breaker, through which the first test sample and the second test sample are electrically connected to the power distribution network; the controller includes a timing controller and a logic operation controller, and the timing controller is electrically connected to the circuit breaker, the main control switch, the first branch switch, the second branch switch and the third branch switch; the logic operation controller is electrically connected to the first selection switch, the second selection switch, the first phase-controlled switch group and the second phase-controlled switch group.

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