Single-phase grounding fault distance protection method for line overloaded and resistant to maloperation and high impedance

A single-phase ground fault, line distance technology, applied in the direction of emergency protection circuit devices, electrical components, etc., can solve the hidden dangers of power grid safety, impedance distance protection malfunction or refusal to operate, impedance distance protection refusal to operate and other problems, to eliminate The effect of protection action performance, prevention of power grid chain tripping accidents, and ensuring the safe and stable operation of the power grid

Active Publication Date: 2013-09-11
STATE GRID CORP OF CHINA +3
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  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

[0005] However, the action performance of impedance distance protection is seriously affected by the transition resistance. The main performance is that if the additional impedance generated by the transition resistance is resistive and inductive, it is easy to cause the impedance distance protection to refuse to operate when there is a fault in the protection zone of the transmission line; if the additional impedance generated by the transition resistance If it is resistive and capacitive, it is easy to cause the impedance distance protection action to exceed when there is a fault outside the protection zone of the transmission line.
[0006] Over/extreme voltage AC transmission lines are often also heavy-duty transmission lines. Heavy-load currents

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  • Single-phase grounding fault distance protection method for line overloaded and resistant to maloperation and high impedance
  • Single-phase grounding fault distance protection method for line overloaded and resistant to maloperation and high impedance
  • Single-phase grounding fault distance protection method for line overloaded and resistant to maloperation and high impedance

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Embodiment Construction

[0017] The technical solutions of the present invention will be further described in detail below in conjunction with the embodiments.

[0018] figure 1 It is a schematic diagram of the line transmission system applying the present invention. figure 1 CVT is a voltage transformer, and CT is a current transformer. The protection device samples the voltage of the voltage transformer CVT and the current waveform of the current transformer CT at the installation place of the transmission line protection to obtain the instantaneous value of the voltage and current, and then the protection device uses the Fourier algorithm for the collected instantaneous value of the voltage and current Calculation of faulted phase voltages at transmission line protection installations , fault phase current , fault phase negative sequence current and zero sequence current , as the input quantity; among them, φ=A phase, B phase, C phase.

[0019] The protection device calculates the line di...

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Abstract

The invention discloses a single-phase grounding fault distance protection method for a line overloaded and resistant to maloperation and high impedance. The method uses a fault phase voltage, a fault phase current, a fault phase negative sequence current and a zero sequence current on a protected installation place of a transmission line to calculate the line distance between the setting protection range of the transmission line and a single-phase grounding fault point, and then whether the line distance between the setting protection range of the transmission line and the single-phase grounding fault point is greater than zero is judged. If the line distance is greater than zero, the single-phase grounding fault point is determined to be located within the setting protecting range of the transmission line, an action tripping signal is sent, and circuit breakers on both ends of the transmission line trip. The method eliminates the influence of transition resistance on protection action performance in principle, and the method has the strong ability to resist the influence of the transition resistance.

Description

technical field [0001] The invention relates to the technical field of electric power system relay protection, in particular to a single-phase grounding fault distance protection method for overload prevention, high resistance and resistance to high resistance. Background technique [0002] Since distance protection is less affected by power system operation mode and structural changes, it can selectively remove various faults in transmission lines instantly, and has been widely used in power system transmission line protection. The distance protection on the high-voltage transmission line is used as the main protection of the transmission line, and the distance protection on the EHV / UHV AC transmission line is used as the backup protection of the transmission line. At present, the distance protection widely used in power system transmission lines mainly includes power frequency variation distance protection and impedance distance protection. [0003] The power frequency va...

Claims

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Application Information

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IPC IPC(8): H02H7/26
Inventor 林富洪曾惠敏
Owner STATE GRID CORP OF CHINA
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