Quick arc extinguishing system and method for single-phase ground fault of low-current ground system

A single-phase grounding fault, low-current grounding technology, applied in emergency protection circuit devices, electrical components, circuit devices, etc. for limiting overcurrent/overvoltage, can solve problems such as non-fault phase arc overvoltage accidents, etc. The effect of avoiding slow control, preventing misoperation, and improving reliability and safety

Active Publication Date: 2017-05-24
南京福致通电气自动化有限公司
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Problems solved by technology

[0004] Purpose of the invention: Aiming at the above-mentioned prior art, to provide a single-phase ground fault rapid arc extinguishing system and method in a small current grounding system, so as to solve the problem of accidents caused by non-faulty phase arc overvoltage during the continuous operation of the current small current grounding system when single-phase grounding question

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  • Quick arc extinguishing system and method for single-phase ground fault of low-current ground system

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Embodiment Construction

[0017] The single-phase ground fault rapid arc extinguishing system of the small current grounding system of the present invention is aimed at the 3kV-66kV small current grounding system. Such as figure 1 As shown, a grounding line selection device 1 is used, installed in the PT cabinet of the busbar, and the acquisition of the three-phase voltage and zero-sequence voltage of the busbar and the command transmission to the thyristor group driving device are completed through the cable; the thyristor group driving device is the same as the grounding line selection The device is installed in the PT cabinet of the busbar, and is used to receive commands issued by the grounding line selection device and send driving pulses to the thyristor groups connected in reverse parallel; the three-phase voltage and zero-sequence voltage of the busbar are connected to the grounding from the busbar voltage transformer 2 through cables Line selection device; the grounding line selection device a...

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Abstract

The invention discloses a quick arc extinguishing system and method for a single-phase ground fault of a low-current ground system. The quick arc extinguishing system comprises a ground line selection device, an inverse parallel thyristor group and a thyristor driving device. The ground line selection device adopts bus three-phase voltage and zero-sequence voltage, judges whether a ground fault exists according to the zero-sequence voltage and judges the ground phase according to the voltage drop phase in the three-phase voltage after single-phase grounding happens, and then the thyristor group driving device triggers the inverse parallel thyristor group to be turned on, the fault phase is directly grounded, and the voltage between the fault phase and the ground is pulled down, so that the accidents of arcing over voltage, cable burnout, personal casualty and the like in the continuous operation process after grounding are prevented.

Description

technical field [0001] The invention relates to the field of relay protection of power systems, in particular to a system and method for quickly extinguishing arcs for single-phase ground faults in small current grounding systems. Background technique [0002] In the 3kV-66kV small current grounding system (also known as the neutral point non-effective grounding system), single-phase grounding is a relatively common fault type. When a single-phase grounding occurs in a low-current grounding system, the fault phase-to-ground voltage decreases, the non-fault phase-to-ground voltage rises, and the line voltage is still symmetrical. In this state, due to the small grounding current, in order to ensure the reliability of power supply, it is allowed to run 1- 2h. However, due to the non-fault phase arc overvoltage, it is easy to cause breakdown of weak insulation parts, voltage transformer iron core saturation, system overvoltage, and the fault phase arc burns the cable, which is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H9/08
CPCH02H9/08
Inventor 薛峰
Owner 南京福致通电气自动化有限公司
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