Power distribution network outgoing feeder fault route selecting method by S transform amplitude detection

A technology for fault line selection and distribution network, applied in the direction of fault location, measuring device, and measurement of electrical variables, etc., can solve problems such as small fault steady-state current and unsatisfactory line selection effect of resonant grounding system

Active Publication Date: 2009-11-25
KUNMING UNIV OF SCI & TECH
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Problems solved by technology

When a single-phase ground fault occurs in a resonant grounding system, the inductance current of the arc suppressing coil compensates the capacitive current generated by the fault, so that the fault steady-state current in t

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  • Power distribution network outgoing feeder fault route selecting method by S transform amplitude detection
  • Power distribution network outgoing feeder fault route selecting method by S transform amplitude detection
  • Power distribution network outgoing feeder fault route selecting method by S transform amplitude detection

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Embodiment Construction

[0061] The specific steps of the line selection algorithm of the present invention are as follows:

[0062] 1. When the instantaneous value of the zero sequence voltage of the busbar u n (t) greater than K u U n , The fault line selection device starts immediately, and uses 1MHz sampling frequency to record the zero sequence voltage of the busbar and the zero sequence current of each feeder 1 cycle before and after the fault, where K u The general value is 0.15, U n Indicates the rated voltage of the busbar;

[0063] 2. Use the discrete form S[m,n] of the S transformation to analyze the zero sequence voltage of the bus to accurately calibrate the time when the fault occurs;

[0064] S [ m , n ] = Σ k = 0 N - 1 X [ n + k ...

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Abstract

The invention relates to a power distribution network outgoing feeder fault route selecting method by S transform amplitude detection, namely, when the power distribution network generates single-phase ground fault, the bus zero sequence voltage before and after the fault can be performed for S transform to find out the moment corresponding to a module maximal value on the S transform highest frequency component position for accurately calibrating the fault moment; the each line zero sequence current before and after the fault moment can be performed for S transform to obtain the S transform complex matrix of each line zero sequence current; the amplitudes of highest frequency component at fault moment in the each line zero sequence current S transform complex matrix can be worked out, and the amplitude difference can be worked out; the integrative amplitude difference of each line zero sequence current can be worked out; the fault route selecting can be implemented by comparing the size of the integrative amplitude difference. The invention can avoid the route selecting failure caused by CT saturation and phase alternation, the invention implements the route selecting by using high-frequency components, without being influenced by arc-suppression coil compensation degree. The accurate route selecting under different fault conditions comprising small fault angle can be implemented.

Description

Technical field [0001] The invention relates to the technical field of power system relay protection, in particular to a method for selecting a fault line of a feeder line of a distribution network using S-conversion argument detection. Background technique [0002] Single-phase grounding fault line selection for resonant grounding system is a difficult point in single-phase grounding fault line selection for distribution network. When a single-phase ground fault occurs in a resonant grounding system, the inductance current of the arc suppression coil compensates for the capacitive current generated by the fault, so that the fault steady-state current in the faulted line is very small, even smaller than the sound line, so the traditional detection based on the fault steady-state information The method is unsatisfactory for the line selection effect of resonant grounding system. Using the transient component after the fault to select the fault line has great advantages compared wi...

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Application Information

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IPC IPC(8): G01R31/08G01R25/00
Inventor 束洪春彭仕欣张广斌朱子钊朱盛强孙士云刘可真唐岚杨毅常勇
Owner KUNMING UNIV OF SCI & TECH
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