Power distribution network broken line grounding test device and test method

A test device and distribution network technology, applied in short-circuit test, fault location, continuity test, etc., can solve problems such as large resource demand, inability to accurately simulate abnormal scenarios, and impact on satisfaction

Pending Publication Date: 2021-05-18
STATE GRID FUJIAN ELECTRIC POWER RES INST +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are several disadvantages in this method. First, the existing line switch is required to be transformed, and different transformation measures are required for different types of disconnection faults. The demand for resources is large, and if there is a power outage, it will affect the satisfaction of the power receiving users; secondly, using the remote control of the section switch or the local opening to simulate the disconnection fault is a manual operation, and the disconnection time cannot be accurately controlled, and the disconnection fault cannot be fully tested Research and judge technology and equipment; third, a separate single-phase grounding device is required to simulate the grounding phenomenon after a disconnection, and it needs to be coordinated with the disconnection operation simulated by the section switch opening action in time, and more abnormalities cannot be accurately simulated Scenes

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  • Power distribution network broken line grounding test device and test method

Examples

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Embodiment 1

[0056] In this example, the test device includes a disconnection simulation unit, a grounding simulation unit and a secondary measurement and control unit. Two sets of three-phase high-voltage pile heads A1, B1, C1 and A2, B2, and C2 are fixedly installed on the upper end of the disconnection simulation unit. The high-voltage pile heads are distinguished by yellow, green, and red, and are connected to the three-phase flexible cables of the overhead line. It is also marked with yellow, green and red to prevent phase-to-phase short circuit caused by wrong wire connection. The high-voltage pile head is connected to the three mechanical isolation switches G1, G2, and G3 inside the disconnection simulation unit through copper plates. The mechanical isolation switches are manually operated and have obvious visual disconnection points for operators to observe the position of the switch , to provide security for the operator. The lower end of the mechanical isolation switch is respec...

Embodiment 2

[0060] The method for carrying out the disconnection test with the device in embodiment 1 may further comprise the steps:

[0061] Step 1: Fix the three groups of flexible cables to the high-voltage pile heads of the disconnection simulation unit, and set parameters such as the opening time of the disconnection vacuum circuit breaker K1, the time sequence coordination between K1 and Q according to the test requirements;

[0062] Step 2: The live work team hooks up three sets of flexible cables to the incoming and outgoing sides of the three-phase segmental switch of the overhead line respectively;

[0063] Step 3, manually close the mechanical isolation switch G1, G2, G3, and remotely close the single-phase vacuum circuit breaker K1, K2, K3;

[0064] Step 4, open the three-phase section switch on the line by remote control or local operation;

[0065] Step 5. According to the test requirements, place the three-position switch F with appropriate contacts;

[0066] Step 6, acc...

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Abstract

The invention provides a power distribution network broken line grounding test device. The test device comprises a broken line simulation unit, a grounding simulation unit and a secondary measurement and control unit. One end of the broken line simulation unit is connected with a three-phase line of a power distribution network, and the other end of the broken line simulation unit is connected with the grounding simulation unit through a built-in first circuit breaker group. The broken line simulation unit and the grounding simulation unit are connected with the secondary measurement and control unit. A second circuit breaker group is arranged in the grounding simulation unit; remote control devices are arranged in the first circuit breaker group and the second circuit breaker group, and the opening and closing states of the first circuit breaker group and the second circuit breaker group can be controlled through the remote control devices during a test, so that the first circuit breaker group and the second circuit breaker group are subjected to time sequence matching. The device and method can be used to simulate disconnection and grounding faults of the power distribution network, and comprehensively verify functions and performance of new technologies and new equipment for disconnection research and judgment.

Description

technical field [0001] The invention relates to the technical field of power distribution equipment, in particular to a disconnection and grounding test device for a distribution network. Background technique [0002] With the intensification of the urbanization process in our country, the scale of the distribution grid structure is getting larger and larger, and the area covered by the grid structure is becoming more and more complex. The distribution network lines often encounter lightning strikes, ground blasting, mechanical excavation, installation techniques, Single-phase disconnection, two-wire disconnection, or even three-phase disconnection caused by electrical quality and other reasons. When the distribution network line is disconnected, because there is no obvious overcurrent, the fault cannot be removed immediately, and the fault identification and section location are difficult. Asymmetry can cause problems such as damage to electrical equipment. [0003] There...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/08G01R31/52G01R31/54
CPCG01R31/086G01R31/52G01R31/54
Inventor 罗翔张振宇高源张明龙王健李衍川翁晓春李怡然陈利娜王耀夏江海李勇李博寇梦立陈秉熙谢芸
Owner STATE GRID FUJIAN ELECTRIC POWER RES INST
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