Single-phase earth fault direction judgment and processing method of small current grounding system

A single-phase ground fault and small current grounding technology, which is applied to the fault location, electrical components, emergency protection circuit devices, etc., can solve the problems of inaccurate fault judgment and untimely fault detection, so as to ensure normal power supply and improve power supply reliability effect

Active Publication Date: 2014-04-30
泉州维盾电气有限公司
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Problems solved by technology

[0006] The purpose of the present invention is to address the deficiencies of the prior art, and provide a method for judging the direction of a single-phase ground fault in a small-curr

Method used

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  • Single-phase earth fault direction judgment and processing method of small current grounding system

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Embodiment Construction

[0040] The method for judging the direction of a single-phase ground fault in a small current grounding system includes the following steps:

[0041] a. Install several section switches on the main line of a feeder in the small current grounding system to divide the feeder into several sections of power supply areas. The circuit breaker is equipped with a zero-sequence current detector, a zero-sequence voltage sensor and an intelligent controller. The zero-sequence current detector is a zero-sequence current transformer ZCT or is set in each phase of A, B, and C for zero-sequence current Synthesized current transformers, A, B, and C phase current transformers are used for the synthesis of zero-sequence current; the zero-sequence voltage sensor is three impedance voltage sensors for the synthesis of zero-sequence voltage;

[0042] b. The zero-sequence current detector automatically detects the zero-sequence current, and the measured zero-sequence current data is passed to the i...

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Abstract

The invention relates to a single-phase earth fault direction judgment and processing method of a small current grounding system. In terms of a fault direction judgment method, the session which a single-phase fault point belongs to on a main line is judged according to zero-sequence currents, zero-sequence voltage and the included angle relation between the zero-sequence currents and the zero-sequence voltage tested through a section switch on the main line where a single-phase earth fault occurs, the fault session is isolated according to the judgment result, and normal power supply of a non-fault session line is guaranteed to the largest extent. According to the judgment and processing method, the single-phase earth fault session of the main line can be automatically isolated, and power supply reliability of a power distribution network is improved; additionally, according to the single-phase grounding direction judgment method, a main line boundary function is embedded in the section switch of a 10kV feeder line, the range in power failure caused by the single-phase earth fault can be shortened to the largest extent, and accordingly reliability and safety of power supply are improved.

Description

technical field [0001] The invention relates to a single-phase grounding fault direction discrimination and processing method in a small current grounding system. Background technique [0002] my country's 10kV power distribution system adopts the operation mode of neutral point indirect grounding (small current grounding system) - that is, the neutral point is not grounded or the neutral point is grounded through the arc suppression coil, and the neutral point is not directly grounded. In the power distribution network, single-phase grounding is a common fault, especially in rainy seasons, strong winds and other severe weather conditions, single-phase grounding faults occur frequently. [0003] After a single-phase ground fault occurs in a low-current grounding system, the fault phase-to-ground voltage decreases, and the phase-to-ground voltage of the non-faulted two phases increases, but the line voltage is still symmetrical, so the continuous power supply to users is not a...

Claims

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Application Information

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IPC IPC(8): G01R31/08H02H7/26
Inventor 贾冬霞
Owner 泉州维盾电气有限公司
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