Power distribution network broken line grounding test device and test method

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...

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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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