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Resonance grounding system single phase grounding fault section positioning method utilizing phase voltage current break variable phase characteristics

A technology of single-phase ground fault and sudden change of phase voltage, which is applied in the direction of fault location and fault detection according to conductor type, etc., can solve the problem of low automation level of single-phase ground fault, and achieve the effect of no filtering and easy engineering realization

Active Publication Date: 2017-09-29
XI AN JIAOTONG UNIV +1
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Problems solved by technology

The probability of a single-phase ground fault in the distribution network is very high. Because the existing regulations require that the resonant grounding system can continue to run for 1 to 2 hours after a single-phase ground fault occurs, during this period the fault is eliminated by manual inspection. low level of automation for single-phase-to-ground faults

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  • Resonance grounding system single phase grounding fault section positioning method utilizing phase voltage current break variable phase characteristics
  • Resonance grounding system single phase grounding fault section positioning method utilizing phase voltage current break variable phase characteristics
  • Resonance grounding system single phase grounding fault section positioning method utilizing phase voltage current break variable phase characteristics

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Embodiment Construction

[0026] The invention aims to solve the single-phase grounding section positioning problem of the resonant grounding distribution network. It is pointed out that the arc suppressing coil has different influences on the current mutation of the fault phase upstream of the fault point of the fault line at different frequencies, but the current mutation of each phase of the healthy line, the current mutation of each phase downstream of the fault point of the fault line, and the current mutation of the healthy phase upstream of the fault point are The capacitive current under the excitation of the abrupt voltage of each phase is not affected by the arc suppressing coil.

[0027] Taking the resonant grounding system with m outgoing lines as an example, as figure 1 shown, where represents the graph variables of the phase currents of the mth line, Indicates A, B, C three-phase. Δu represents the abrupt voltage, Indicates the equivalent capacitance to ground of each phase of the ...

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Abstract

The invention discloses a resonance grounding system single phase grounding fault section positioning method utilizing phase voltage current break variable phase characteristics. The method comprises steps that step 1, a break variable of a phase voltage and a break variable of a phase current of each data acquisition device are calculated; step 2, phases of all frequency components of the phase voltage break variables and the phase current break variables are calculated through utilizing a matrix pencil algorithm; step 3, phase angle difference dph (50) of a phase voltage break variable power frequency component and a phase current break variable power frequency component of one same acquisition device is acquired; step 4, phase angle difference dph (fm) of any high frequency component of the phase voltage break variable and any high frequency component of the phase current break variable is calculated; step 5, an absolute value dj of the difference of the dph (50) and the dph (fm) is calculated; and step 6, magnitudes of all the dj are determined, and a fault section is identified. The method is advantaged in that zero sequence voltages and currents are not required, the phase voltage and the phase current of each phase are only required, compared with a resonance grounding system section positioning method based on the zero sequence voltages and currents, the method has further has properties of autonomy, no need of filtering and easy realization.

Description

technical field [0001] The invention belongs to the technical field of relay protection for distribution networks, and in particular relates to a method for locating a single-phase ground fault section of a resonant ground system. Background technique [0002] my country's distribution network mostly adopts the neutral point grounding method through the arc suppression coil, and in order to avoid resonance overvoltage, it is usually a compensation operation. The probability of a single-phase ground fault in the distribution network is very high. Because the existing regulations require that the resonant grounding system can continue to run for 1 to 2 hours after a single-phase ground fault occurs, during this period the fault is eliminated by manual line inspection. The automation level of single-phase ground fault is low. In 2015, the National Energy Administration issued the "Action Plan for Construction and Transformation of Distribution Networks (2015-2020)". The docume...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/08
CPCG01R31/086
Inventor 宋国兵常仲学刘漫雨许冲冲谷君朱洁迟忠君袁清芳吕立平
Owner XI AN JIAOTONG UNIV
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