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Relay protection method for interphase short circuit faults of electric transmission line

A transmission line and phase-to-phase short-circuit technology, applied in the direction of emergency protection circuit devices, electrical components, etc., can solve problems such as power grid safety hazards, load transfer, impedance distance protection misoperation or refusal to operate, etc., and achieve stable, correct and reliable protection range Effects with high action and action sensitivity

Active Publication Date: 2013-08-14
STATE GRID CORP OF CHINA +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The additional impedance generated by the transition resistance will seriously affect the action performance of the impedance distance protection
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 short-circuit fault between phases in the protection zone; The distance protection action produces overtaking
[0003] High / super / extreme voltage AC transmission lines are often also heavy-duty transmission lines. Heavy-load currents will cause the impedance distance protection to malfunction or refuse to operate. The influence of heavy-load currents on the performance of impedance distance protection cannot be ignored.
Under the condition of overload transmission, the line operates normally. The measured impedance of the traditional impedance distance protection will seriously deviate from the actual measured impedance due to the influence of the overload current, which will easily lead to the misoperation of the traditional distance protection, resulting in the expansion of the power grid blackout range, and even causing a large number of load transfers to threaten the line. Normal operation has caused a huge security risk to the power grid

Method used

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  • Relay protection method for interphase short circuit faults of electric transmission line
  • Relay protection method for interphase short circuit faults of electric transmission line
  • Relay protection method for interphase short circuit faults of electric transmission line

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Embodiment Construction

[0018] The technical solution of the present invention will be further described in detail according to the accompanying drawings.

[0019] figure 1 It is a schematic diagram of the line transmission system applying the present invention. figure 1 Among them, PT is a voltage transformer, and CT is a current transformer. The protection device samples the voltage waveform of the voltage transformer PT and the current waveform of the current transformer CT at the transmission line protection installation to obtain the instantaneous voltage and current values, and uses the Fourier algorithm to calculate the fault phase-to-phase voltage at the transmission line protection installation Fault phase current and negative sequence current between fault phases Among them, φφ=AB, BC, CA phase.

[0020] The protection device calculates the voltage drop from the transmission line protection installation to the phase-to-phase short circuit fault point

[0021] Δ ...

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Abstract

The invention discloses a relay protection method for interphase short circuit faults of an electric transmission line. The relay protection method comprises the following steps: a voltage drop from an electric transmission line protection mounting part to an interphase short circuit fault point and a voltage drop from an electric transmission line protection setting range to the interphase short circuit fault point are calculated by using fault interphase electrical capacity at the electric transmission line protection mounting part, and if the angle between the voltage drop from the electric transmission line protection mounting part to the interphase short circuit fault point and the voltage drop from the electric transmission line protection setting range to the interphase short circuit fault point ranges from 90 degrees to 270 degrees, an action tripping signal is given out by a protection device. The method solves the problem of the influence of transition resistance and load current on the protection action performance, and when interphase high-resistance short circuit faults occur to the electric transmission line, the method can act correctly and reliably, the action sensitivity is high, and the protection range is stable.

Description

technical field [0001] The invention relates to the technical field of electric power system relay protection, in particular to a relay protection method for interphase short-circuit faults of transmission lines. Background technique [0002] The additional impedance generated by the transition resistance will seriously affect the action performance of the impedance distance protection. 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 short-circuit fault between phases in the protection zone; The distance protection action produces overtaking. [0003] High / super / extreme voltage AC transmission lines are often also heavy-duty transmission lines. Heavy-load currents will cause impedance distance protection to malfunction or refuse to operate. The impact of heavy-load current on the performance of impedance distance protection cannot be igno...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/26
Inventor 林富洪
Owner STATE GRID CORP OF CHINA
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