Method of detecting triphase asymmetry failure in low voltage line and comprehensive protection module

A low-voltage line, fault detection technology, applied in fault location, emergency protection circuit device, emergency protection device with automatic disconnection, etc. The effect of simplified protection, wide application range and easy operation and maintenance
CN100552465CInactive Publication Date: 2009-10-21傅桂兴
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
傅桂兴
Publication Date
2009-10-21
Estimated Expiration
Not applicable · inactive patent

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Abstract

The method of detecting triphase asymmetry failure in low voltage line includes zero sequence current time sequence identification and interphase time sequence identification. The comprehensive protection module for triphase asymmetry failure in low voltage line includes one zero sequence voltage signal processing circuit, one zero sequence current signal processing circuit, one asymmetry failure time sequence discriminator, one triphase voltage signal processing circuit and one triphase current signal processing circuit. The present invention can search failed line in 380 V and 660 V power network in high sensitivity and high accuracy, and realize the detection on and protection against phase failure and interphase short circuit.
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Description

technical field

[0001] The invention belongs to a power system fault detection and relay protection device, in particular to the identification and protection of three asymmetrical faults of a low-voltage line, such as single-phase ground leakage or short circuit, single-phase disconnection (phase loss operation) and two-phase short circuit. Background technique

[0002] The neutral point of the low-voltage (380V or 660V) power grid in industrial and mining enterprises can be directly grounded or ungrounded. For example, the underground low-voltage power grid in coal mines adopts the neutral point ungrounded mode, while the ground low-voltage power grid of general industrial and mining enterprises and rural power grids mostly adopts the three-phase four-wire system in which the neutral point is directly grounded. On the one hand, this three-phase four-wire low-voltage power grid is responsible for the power supply of many three-phase power loads of low-voltage asynchronous m...

Claims

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