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Distribution network single-phase grounding fault simulation and positioning performance test platform and method

A single-phase ground fault, positioning performance technology, applied in the direction of measuring devices, measuring electrical variables, instruments, etc.

Active Publication Date: 2015-09-16
STATE GRID CORP OF CHINA +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, there is still no reliable method and experimental equipment for performance testing of single-phase grounding line selection / ranging devices

Method used

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  • Distribution network single-phase grounding fault simulation and positioning performance test platform and method
  • Distribution network single-phase grounding fault simulation and positioning performance test platform and method
  • Distribution network single-phase grounding fault simulation and positioning performance test platform and method

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Embodiment Construction

[0022] see figure 1 As shown, a distribution network single-phase ground fault simulation and positioning performance testing platform of the present invention includes: a fuse 1, a first isolation switch 2, a current transformer 3, a first circuit breaker 4, and adjustable High-power resistor 6 (resistance value 0-1M ohm, step size 0-0.1M ohm), second circuit breaker 7, second isolation switch 8, third isolation switch 9, gas discharge gap 10, controllable Arc discharge device 11 , protection device 13 , controller 14 and signal acquisition unit 15 . The dielectric strength of the gas discharge gap 10 can be adjusted to be 0-100kV. The controllable arc discharge device 11 can simulate various arc grounding phenomena through different parameter settings, and the insulation strength can be adjusted to 0-100kV.

[0023] One end of the fuse 1 is connected to the circuit through an insulated wire 16 and a live bonding fitting 17, the other end is connected to one end of the firs...

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Abstract

The invention discloses a distribution network single-phase grounding fault simulation and positioning performance test platform and a method. One end of a first isolating knife switch is connected with a line, the other end of the first isolating knife switch is connected with one end of a first circuit breaker, the other end of the first circuit breaker is connected with one end of a graded and adjustable high-power resistor, the other end of the graded and adjustable high-power resistor is connected with one end of a second circuit breaker, and the other end of the second circuit breaker is grounded through an insulating conductor. One end of a second isolating knife switch is connected with the other end of the graded and adjustable high-power resistor, the other end of the second isolating knife switch is connected with one end of a gas discharge gap, and the other end of the gas discharge gap is grounded through the insulating conductor. One end of a third isolating knife switch is connected with the other end of the graded and adjustable high-power resistor, the other end of the third isolating knife switch is connected with one end of a controllable arc discharge device, and the other end of the controllable arc discharge device is grounded through the insulating conductor. By controlling the first circuit breaker, the second circuit breaker and the graded and adjustable resistor, simulation of line single-phase grounding is realized.

Description

technical field [0001] The invention belongs to the technical field of fault detection of large-scale electric equipment, and in particular relates to a single-phase ground fault simulation test platform of a distribution network. Background technique [0002] my country's medium-voltage power distribution network is mainly an indirect grounding system, that is, a neutral point ungrounded system or a neutral point grounded system through an arc suppression coil. After a single-phase ground fault occurs in such a system, the fault current is very small, so it is not necessary to trip immediately. Especially when an instantaneous single-phase ground fault occurs, the short-circuit point can extinguish the arc and restore insulation by itself, without the need for operators to take any measures, which has positive significance for reducing the number of short-term power outages for users. [0003] The regulations stipulate that after a single-phase ground fault occurs, it can ...

Claims

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Application Information

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IPC IPC(8): G01R35/00
Inventor 申巍刘健张小庆张志华权立
Owner STATE GRID CORP OF CHINA
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