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Fast Diagnosis and Treatment Method of Ferromagnetic Resonance and Single-phase Grounding Fault in Distribution Network

A single-phase ground fault, ferromagnetic resonance technology, applied in the fault location, electrical components, emergency protection circuit devices, etc., can solve problems such as inability to judge, delay processing time, accident occurrence, etc. The effect of subharmonic resonance

Active Publication Date: 2016-06-15
李景禄
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Problems solved by technology

Because the traditional treatment methods for ferroresonance overvoltage and grid single-phase ground fault are different, because ferroresonance overvoltage and grid single-phase ground fault cannot be accurately judged and processed in time, the processing time is delayed, which often leads to accident happened

Method used

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  • Fast Diagnosis and Treatment Method of Ferromagnetic Resonance and Single-phase Grounding Fault in Distribution Network

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Embodiment Construction

[0013] First, determine the number of electromagnetic voltage transformers installed in each bus section of the substation, and measure the zero sequence impedance of the electromagnetic voltage transformer. The dynamic early warning of resonance conditions is based on the excitation reactance Xp of the electromagnetic voltage transformer installed on the busbar of the substation. When the operation mode of the distribution network changes, the grid-to-earth capacitive reactance X obtained by tracking measurement c The value is compared with the excitation reactance Xp of the voltage transformer, and the dynamic diagnosis and early warning are carried out when the condition of ferromagnetic resonance is met. Report the operation management personnel through remote communication that a ferromagnetic resonance failure caused by an electromagnetic voltage transformer may occur in this operation mode.

[0014] When an abnormal displacement voltage occurs at the neutral point of the po...

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Abstract

The invention provides a quick diagnostic and processing method of power distribution network ferromagnetic resonance and one-phase earth faults. When a power grid operation mode changes, firstly, excitation reactance Xp of an electromagnetic type voltage transformer of a transformer substation bus system is typed in a computer measure and control unit, then a power grid tracking measurement branch circuit is used for carrying out tracking measurement on the system capacitive reactance value of the power grid operation mode, if the system capacitive reactance value meets a power grid ferromagnetic resonance condition is judged, and resonance condition dynamic early-warning is carried out. When power grid neutral point displacement voltages are abnormal, an earth current compensation and detection branch circuit is adopted to detect zero sequence currents of a loop, and according to the magnitude of the zero sequence currents, ferromagnetic resonance and one-phase earth judgement is carried out. When it is judged that ferromagnetic resonance faults happen, a resonance eliminating branch circuit is switched for eliminating resonance, and when it is judged that one-phase earth faults happen, the zero sequence current method is used for selecting a fault line.

Description

Technical field [0001] The invention is the field of rapid diagnosis and processing of ferromagnetic resonance and single-phase grounding faults in power distribution networks, and mainly relates to a method for quickly determining and eliminating ferromagnetic resonance and resonant resonance of ferromagnetic resonance and single-phase grounding faults in power distribution networks. Background technique [0002] The resonance overvoltage of the distribution network is mainly caused by the ferromagnetic resonance overvoltage caused by the electromagnetic voltage transformer. The ferromagnetic resonance overvoltage occurs in a circuit containing iron core inductance. When the voltage transformer is saturated, the inductance is no longer a constant, but changes with the current or magnetic flux. When certain conditions are met, Will produce ferromagnetic resonance. The ferromagnetic resonance overvoltage caused by the saturation of the electromagnetic voltage transformer includes...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/26G01R31/08
CPCY04S10/52
Inventor 李政洋李景禄
Owner 李景禄
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