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Power distribution network single-phase earth fault hybrid arc extinction method considering line impedance

A single-phase ground fault, line impedance technology, applied to electrical components, circuit devices, emergency protection circuit devices, etc., can solve the problems of poor arc suppression effect of load power, long fault feeder, etc., and achieve good results

Inactive Publication Date: 2022-06-14
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

However, the traditional voltage arc suppression method ignores the influence of line impedance and load
The traditional voltage arc suppression method has poor arc suppression effect when the fault feeder is long, the load power is large and the fault resistance is small

Method used

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  • Power distribution network single-phase earth fault hybrid arc extinction method considering line impedance
  • Power distribution network single-phase earth fault hybrid arc extinction method considering line impedance
  • Power distribution network single-phase earth fault hybrid arc extinction method considering line impedance

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Embodiment Construction

[0020] The present invention is further described in detail below in conjunction with the accompanying drawings.

[0021] The basic principle of single-phase grounding fault in the distribution network considering the line impedance is described in figure Figure 1 as shown.

[0022] Z lX 、Z load and Z CX They are line impedance, load impedance and ground impedance. The loads are triangularly connected. Since the relative leakage resistance is unusually large compared to the impedance of the relative ground capacitor, the relative leakage resistance can be ignored. is a neutral point voltage, Injects current into the arc suppression device. Is the power supply electromotive force for the distribution network. R f is a fault resistor. and The fault point voltage and current are respectively.

[0023] According to the symmetric component method, the distribution network single-phase ground fault composite sequence network diagram is as follows Figure 2 as shown. Z l1 and Z l0 Th...

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Abstract

The invention discloses a power distribution network single-phase earth fault hybrid arc extinction method considering line impedance. A power distribution network model considering line impedance and load is established. Influences of line impedance and load on an existing voltage arc extinction method are researched, and a neutral point voltage reference value used for accurate single-phase earth fault voltage arc extinction and injection current used for current arc extinction are provided. The influence of the line impedance and the load on arc extinction is analyzed, and the line impedance and the load are key factors for determining fault current and are not negligible in an arc extinction method. When the fault position is close to the tail end of the line, especially when the load is large and the grounding resistance is small, the arc extinguishing method without considering the line impedance cannot limit the residual current below an ideal self-extinguishing threshold value. According to the power distribution network single-phase earth fault hybrid arc extinction method considering the line impedance and the load, reliable arc extinction under the complex earth fault working condition can be achieved at any fault position, any earth resistance and any load.

Description

Technical field [0001] The present invention relates to the field of distribution network arc suppression, in particular to a distribution network single-phase ground fault hybrid arc suppression method considering line impedance and load effects. Background [0002] Most faults in the distribution network originate from single-phase ground faults, and as the distribution network expands and cables are widely used, the fault current increases dramatically. The resulting ground fault arc is difficult to extinguish on its own, which can lead to overvoltage and phase-to-phase short circuits. In order to achieve reliable arc suppression, there are two main methods of single-phase ground fault compensation: passive arc suppression and active arc elimination. Passive arc suppression uses an arc suppression coil whose inductor current is used to compensate for the capacitance current in the distribution network. The arc suppression coil can only compensate for the power frequency capaci...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/26H02H9/08
CPCH02H7/26H02H9/08
Inventor 王文刘琼陈钦泽
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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