Singlephase earth fault signal generating device and method for simulation isolated neutral system

A single-phase ground fault, neutral point ungrounded technology, applied in the direction of measuring devices, instruments, measuring electricity, etc., can solve the problems of endangering the insulation safety of electrical equipment, high intermittent arc overvoltage, phase-to-phase short circuit, etc.

Inactive Publication Date: 2016-03-30
STATE GRID CORP OF CHINA +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Single-phase arcing grounding is the most harmful. Under the operation mode of the neutral point ungrounded system below 40.5kV, as more and more distribution lines are cabled, the grounding capacitor current will also increase. Once arcing grounding occurs, It cannot be extinguished automatically, and it will generate high intermittent arc overvoltage, which will endanger the insulation safety of electrical equipment. It will often develop into phase-to-phase short circuit in the cable line, and even cause the bad consequences of "burning and burning".

Method used

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  • Singlephase earth fault signal generating device and method for simulation isolated neutral system
  • Singlephase earth fault signal generating device and method for simulation isolated neutral system
  • Singlephase earth fault signal generating device and method for simulation isolated neutral system

Examples

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Effect test

Embodiment 1

[0087] When the resistor installed in the experimental device is a creepage type arc resistor, the measurement steps include the initiation of the grounding arc under the 10KV operating state and the initiation of the instantaneous overvoltage grounding arc. The specific steps include:

[0088] (1) Initiation of grounding arc light under 10KV operating state: adjust the length distance of tungsten ring 12 and tungsten particle layer 13 by sliding contact to trigger grounding arc light, and start to generate continuous arc light when the distance is less than 10mm, and the arc light current is the largest at this time; then elongate The distance keeps the arc light continuous (the distance is less than 80mm), and the arc light current decreases accordingly; the arc light starts to become intermittent arc light when the distance is longer than 150mm, and the arc light is interrupted when the distance is greater than 150mm; at the same time as the above operation, the 10KV neutral ...

Embodiment 2

[0091] When the resistor installed in the experimental device is an air discharge capacitive arc resistor, the measurement steps include the initiation of the grounding arc under the 10KV operating state and the initiation of the instantaneous overvoltage grounding arc. The specific steps include:

[0092] (1) Initiation of grounding arc light under 10KV operating state: trigger grounding arc light by adjusting the distance L1 of the effective discharge gap between the first probes 22, and start to generate continuous arc light when the distance L1 is less than 6mm, and the arc light current is the largest at this time; then Lengthen the distance L1 to maintain a continuous arc (distance L1 is less than 30mm), and the arc current decreases; then extend the distance L1, the arc starts to become intermittent arc, and when the distance L1 is greater than 50mm, the arc is interrupted; while the above operation , the zero-sequence voltage, zero-sequence current, open triangle voltag...

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Abstract

The invention provides a singlephase earth fault signal generating device and method for a simulation isolated neutral system. The singlephase earth fault signal generating device for a simulation isolated neutral system comprises a three-phase 10KV power line, a single-stage breaker, a disconnecting switch and a grounding resistor group, wherein one end of the single-stage breaker is connected with a one-phase power line among the three-phase 10KV power line; the other end of the single-stage breaker is connected with one end of the grounding resistor group through the disconnecting switch; and the other end of the grounding resistor group is grounded. The singlephase earth fault signal generating device for a simulation isolated neutral system determines the grounding type of the simulation isolated neutral system by means of simulation grounding under different analog quantity and adjusting of the grounding resistor group and according to the angular phase difference variance, caused by different grounding resistance values, of the zero sequence voltage, the zero sequence current, the opening triangle voltage and the zero sequence current voltage of a sampling zero sequence voltage transformer group, so as to provide power transmission and distribution early warning parameters for a high resistance singlephase earth fault.

Description

technical field [0001] The invention belongs to the technical field of electric power detection equipment, and in particular relates to a device and method for simulating a single-phase ground fault signal of a neutral point ungrounded system. Background technique [0002] In the power system, single-phase grounding is the main fault form of power grid operation, accounting for more than 60% of the total faults in the entire power grid, and a considerable part of phase-to-phase short-circuit faults are caused by single-phase grounding faults. The safety and reliability of the power system, when other conditions are the same, only depends on the grounding method of the neutral point of the power system. To study the grounding mode of the neutral point of the power system, it is mainly to correctly understand and deal with the common single-phase ground fault problem. [0003] The types of single-phase ground faults can be divided into: arc ground (capacitive ground), high re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R1/28
CPCG01R1/28
Inventor 周虎黄维成赵林平祁胜利陈佳黎高小明孙沛吴守尊袁鹏程孙海鸿夏旺王斌张鹏王杨柴明轩王浩强杨志新
Owner STATE GRID CORP OF CHINA
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