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Bias magnetic type arc suppression coil automatic tracking compensation method

A technology of an arc suppression coil and a compensation method, which is applied to emergency protection circuit devices, electrical components, circuit devices, etc. for limiting overcurrent/overvoltage, and can solve interphase short circuits, interphase insulation thermal damage at grounding points, and voltage mutual inductance. Exciter excitation current surge and other problems

Inactive Publication Date: 2013-11-06
HEFEI TIANHAI ELECTRICAL TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] (2) In the transient process of single-phase grounding, a large grounding current will be generated, which will damage the phase-to-phase insulation of the grounding point and cause phase-to-phase short circuit
[0007] (3) The surge of excitation current of voltage transformer caused by single-phase grounding arc is an important reason for the damage of voltage transformer

Method used

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  • Bias magnetic type arc suppression coil automatic tracking compensation method
  • Bias magnetic type arc suppression coil automatic tracking compensation method
  • Bias magnetic type arc suppression coil automatic tracking compensation method

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Embodiment Construction

[0039] Such as figure 1 As shown in the figure, a method of automatic tracking compensation for the biased arc suppression coil, the series resistance R1 on the arc suppression coil is grounded, when the arc suppression coil is in normal operation, L is the inductance of the arc suppression coil, r0 is the active power loss of the arc suppression coil, etc. Effective resistance, assuming that the three-phase voltage of the power grid is completely balanced, where U Φ , the leakage resistance of each phase is equal, ra=rb=rc=r, and U A as a reference phasor;

[0040] U N = - jω ( Ca + α 2 Cb + αCc ) jω ( Ca + ...

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Abstract

The invention discloses a bias magnetic type arc suppression coil automatic tracking compensation method. A resistor R1 is in series connection with an arc suppression coil and connected with the ground. When the arc suppression coil is in normal operation, the inductance of the arc suppression coil is L, the equivalent resistance of active loss of the arc suppression coil is r0, three-phase voltages of a power grid are set to be completely balanced and are U phi, the leakage resistances of the phases are equal, ra=rb=rc=r, and UA serves as a reference phasor. The resistor is in series connection with the arc suppression coil and connected with the ground, the damping ratio of the power grid is increased through the series resistor, so that when the power grid is in normal operation, the arc suppression coil works in the position far away from a resonance point, single-phase grounding occurs, the arc suppression coil is instantly adjusted, full compensation is conducted, adjustment is flexible, and the effect is good.

Description

technical field [0001] The invention relates to the technical field of urban power grids, in particular to an automatic tracking compensation method for a biased arc suppression coil. Background technique [0002] Most of my country's urban power grids and medium-voltage systems in factories and mines are neutral point ungrounded (that is, small current grounded) systems. When the single-phase grounding occurs in this system, the power grid can still operate with a fault, which greatly reduces the operating cost and improves the reliability of the power supply system, but this power supply mode is prone to arc flash when the single-phase grounding current is large The voltage and phase-to-phase short circuit have caused great harm to the power supply and consumption equipment. [0003] The capacitive current refers to the single-phase grounding current of the neutral point ungrounded power supply system. Since its main component is the capacitive reactive component, it is a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H9/08
Inventor 张克贵潘村
Owner HEFEI TIANHAI ELECTRICAL TECH
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