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Metal grounding principle-based single phase arc light overvoltage limiting device

A technology of limiting device and metal grounding, applied in the field of electric power, which can solve the problems of arrester explosion, transmission overvoltage, fusing and so on.

Active Publication Date: 2016-12-07
STATE GRID CORP OF CHINA +4
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] High-amplitude overvoltage aggravates the cumulative damage of solid insulation such as cables. At the same time, the arc-ground overvoltage will also cause PT or fuse to blow, and more seriously, it will cause the arrester to explode.
[0004] To solve the problem of arc grounding, the method of changing the neutral point grounding method of the system was adopted earlier, using small resistance grounding, sacrificing the reliability of power supply to solve the problem of arc grounding, and later developed to adopt the principle of arc suppression coil, using the different voltage and current characteristics of inductors and capacitors , the inductance current is used to compensate the capacitive current. Since the arc grounding is high-frequency, the arc suppression coil designed according to the power frequency cannot compensate the high-frequency current. On the contrary, the connection of the coil will cause many side effects, such as: inaccurate line selection , easy to generate resonance, transmit overvoltage, etc.

Method used

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  • Metal grounding principle-based single phase arc light overvoltage limiting device
  • Metal grounding principle-based single phase arc light overvoltage limiting device
  • Metal grounding principle-based single phase arc light overvoltage limiting device

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Embodiment Construction

[0045] The present invention will be further described in conjunction with the following examples:

[0046] The present invention is a single-phase arc overvoltage limiting device based on the principle of metal grounding, which includes a monitoring module and a limiting device, the monitoring module includes a performance evaluation unit, a network selection unit and a network optimization unit, and the limiting device includes a high-voltage isolation switch BD -1. Primary harmonic elimination device GDQ-2, intelligent controller GDM-3, voltage transformer PT-4 with auxiliary secondary winding, high-voltage current-limiting fuse assembly FU-5, high-voltage vacuum contact with phase separation control Device JZ-6 and three-phase combined overvoltage protector GDB-7.

[0047] Preferably, the monitoring module uses a wireless sensor network to monitor the operation of the power grid in real time, and the wireless sensor network uses the zigbee protocol for data communication; ...

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PUM

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Abstract

A metal grounding principle-based single phase arc light overvoltage limiting device is disclosed and comprises a monitoring module and a limiting device, wherein the monitoring module comprises a performance evaluation unit, a network selecting unit and a network optimization unit, wherein the limiting device comprises a high voltage isolation switch BD, a primary harmonic resonance elimination device GDQ, an intelligent controller GDM, an auxiliary secondary winding-equipped voltage transformer PT, a high voltage current limiting fuse protector assembly FU, a high voltage vacuum contactor JZ capable of individual phase control and a three phase combined type overvoltage protection device GDB. The device can be used for switching off corresponding apparatuses according to user requirements, magnitude of currents is used as criteria, a plurality of locking functions can be fulfilled, and reliable power supply of a power grid system can be ensured.

Description

technical field [0001] The invention relates to the field of electric power technology, in particular to a single-phase arc overvoltage limiting device based on the principle of metal grounding. Background technique [0002] Most of the power grids below 35kV in my country adopt the neutral point indirect grounding operation mode. When a single-phase intermittent arc-flash ground fault occurs in the neutral point indirect grounding system, the arc is continuously extinguished and re-ignited for many times, resulting in the accumulation and redistribution of charges on the ground capacitance of the system, and the inductance of the non-fault phase- High-frequency oscillation overvoltage is caused on the capacitor circuit. [0003] High-amplitude overvoltage aggravates the cumulative damage of solid insulation such as cables. At the same time, arc-ground overvoltage will also cause PT or fuse to blow, and more seriously, it will cause the arrester to explode. [0004] To sol...

Claims

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Application Information

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IPC IPC(8): H02H9/04H02H9/06H02H3/08H02J13/00
CPCH02J13/0006H02H3/08H02H9/04H02H9/06
Inventor 殷峰李娟杜建梁乃峰赵普志王锦山王力张永喜田海刚周二彪石国宇王轩赵军汪健袁铁江刘勇刘俊
Owner STATE GRID CORP OF CHINA
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