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Current differential protection method adopting Apollonius theorem

A technology based on Attorney's circle theorem and current differential, applied in the direction of automatic disconnection of emergency protection devices, emergency protection circuit devices, electrical components, etc.

Active Publication Date: 2016-06-08
CHINA ELECTRIC POWER RES INST +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the current differential protection criterion mostly adopts the sum difference criterion, and the sensitivity of the current differential protection is changed by adjusting the braking coefficient. However, under heavy load conditions, the load current affects the braking amount of the current differential protection, which reduces the sensitivity.

Method used

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  • Current differential protection method adopting Apollonius theorem
  • Current differential protection method adopting Apollonius theorem
  • Current differential protection method adopting Apollonius theorem

Examples

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Embodiment 1

[0020] The invention of this example is a current differential protection method using the Arborius circle theorem, including:

[0021] 1) Collect the sampling values ​​of the three-phase currents on both sides of the line, and use the Fourier algorithm to calculate the phasor, which can be obtained

[0022] 2) Compare and the size of | I · M | > | I · N | season ρ · = I · N / I · M ; when | I · M | | ...

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Abstract

The invention relates to a current differential protection method adopting the Apollonius theorem. The current differential protection method comprises the following steps: acquiring phasors of three-phase current on two sides of a power transmission line as shown in the specification; mapping a current differential protection criterion on a current complex plane; according to the Apollonius theorem, adjusting the position of an acting circle to obtain the current differential protection criterion on the current complex plane; and converting the current differential protection criterion to a phasor form. According to the technical scheme provided by the invention, a current differential protection movement range is determined by using the Apollonius theorem, so that the range of a current differential protection acting region is expanded, and the sensitivity of current differential protection is improved when faults occur in the region; and meanwhile, the reliability of the current differential protection is not reduced when faults occur outside the region.

Description

technical field [0001] The invention relates to the field of relay protection, in particular to a current differential protection method using the Arborius circle theorem. Background technique [0002] As the main protection of EHV / UHV transmission lines, current differential protection is widely used in power grids all over the world. At present, the current differential protection principles adopted in line protection at home and abroad include steady-state quantity differential protection, sudden change quantity differential protection, and sampled value differential protection. At present, the current differential protection criterion mostly adopts the sum difference criterion, and the sensitivity of the current differential protection is changed by adjusting the braking coefficient. However, under heavy load conditions, the load current affects the braking amount of the current differential protection, which reduces the sensitivity. . Contents of the invention [00...

Claims

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Application Information

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IPC IPC(8): H02H7/26H02H3/34
CPCH02H3/34H02H7/262
Inventor 柳焕章王兴国周泽昕郭雅蓉杜丁香
Owner CHINA ELECTRIC POWER RES INST
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