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Quick diagnostic and processing method of power distribution network ferromagnetic resonance and one-phase earth faults

A single-phase ground fault and ferromagnetic resonance technology, which is applied to fault locations, electrical components, emergency protection circuit devices, etc., can solve problems such as inability to judge, delay processing time, and accidents, and achieve excellent harmonic elimination effects and eliminate various Effect of Subharmonic Resonance

Active Publication Date: 2014-06-04
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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  • Quick diagnostic and processing method of power distribution network ferromagnetic resonance and one-phase earth faults

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Embodiment Construction

[0013] Firstly, 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 transformers. The dynamic early warning of resonance conditions is based on the excitation reactance Xp of the electromagnetic voltage transformer installed on the substation busbar. When the operation mode of the distribution network changes, the capacitance reactance X c The value is compared with the excitation reactance Xp of the voltage transformer, and when it meets the ferromagnetic resonance condition, the dynamic diagnosis and early warning are carried out. Report to the operation management personnel through remote communication that ferromagnetic resonance faults caused by electromagnetic voltage transformers may occur in this operation mode.

[0014] When there is an abnormal displacement voltage at the neutral point of the power grid, or when the three-phase voltage rise...

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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 belongs to the field of rapid diagnosis and treatment of distribution network ferromagnetic resonance and single-phase grounding faults, and mainly relates to a method for quickly judging and eliminating ferromagnetic resonance faults and single-phase grounding faults of distribution networks. Background technique [0002] The resonant overvoltage of the distribution network is mainly caused by the ferromagnetic resonance overvoltage caused by the electromagnetic voltage transformer. Ferroresonance 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 change of current or magnetic flux. When certain conditions are met, it will Ferromagnetic resonance will occur. The ferromagnetic resonance overvoltage caused by the saturation of the electromagnetic voltage transformer includes: fundamental resonance, higher harmonic resonanc...

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Application Information

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IPC IPC(8): H02H7/26G01R31/08
CPCY04S10/52
Inventor 李政洋李景禄
Owner 李景禄
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