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Adaptive approach for route selection of grounded system connected to arc suppression coil

A technology for arc suppressing coil grounding and system failure, applied in the direction of the fault location, etc., which can solve problems such as unfavorable practical application and failure to consider busbar faults

Inactive Publication Date: 2007-11-14
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can be seen that the algorithm in Document 9 requires a large amount of sampled data, which is not conducive to practical application, and the method does not consider the bus fault

Method used

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  • Adaptive approach for route selection of grounded system connected to arc suppression coil
  • Adaptive approach for route selection of grounded system connected to arc suppression coil
  • Adaptive approach for route selection of grounded system connected to arc suppression coil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0066]The specific implementation flow chart of this method is shown in FIG. 4 . The concrete steps of this method are as follows:

[0067] (1) When the bus zero-sequence voltage instantaneous value u of the small current grounding system 0 (t) greater than K u u n , The fault line selection device starts immediately, and records the zero-sequence current of each outgoing line and the zero-sequence voltage of the busbar in the 2 cycles before the fault and the 3 cycles after the fault. Among them, K u The general value is 0.35, U n Indicates the rated voltage of the busbar;

[0068] (2) Looking forward from the starting time of the line selection device, look for a voltage less than 0.01U on the zero-sequence voltage of the bus n The sampling point of , and its corresponding time is considered as the time t when the single-phase-to-ground fault occurs f ;

[0069] (3) from t f Start to select the sampling point of one cycle of bus zero-sequence voltage, and calculate ...

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Abstract

An adaptive method of fault wire selection includes starting up fault wire selection device to record zero sequence current and voltage of each outlet on two cycles before fault and three cycles after fault when bus zero sequence transient voltage value uo ( t ) is over KuUn as Ku value of 0.35 and Un referring to bus rated voltage; searching sample point with value being less than 0.01 Un on bus; finding out corresponding time when single phase earthing fault is occurred; calculating phase angle theta uo and each line I DC to obtain criteria 1, 2, 3 and 4; selecting wire for system fault as per criteria.

Description

Technical field: [0001] The invention relates to an adaptive method for fault line selection of an arc-suppression coil grounding system, belonging to the technical field of electric power system relay protection. Background technique: [0002] The neutral point non-effective grounding system in which the single-phase grounding arc can extinguish itself is called a small grounding current system. my country's 6 ~ 66kV distribution network usually belongs to the small ground current system (reference 1). [0003] The neutral point of the distribution network is generally not grounded through the arc suppression coil or the neutral point. When a single-phase ground fault occurs, since no short circuit is formed, the regulations allow continuous operation for 1-2h, but the long-term grounding operation is very easy to form a two-phase ground fault. Grounding short circuit, arcing grounding can also cause system-wide overvoltage. In order to prevent the fault from expanding, i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/08
Inventor 束洪春司大军张杰刘娟刘志坚唐岚邱革非孙向飞
Owner KUNMING UNIV OF SCI & TECH
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