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Relay protection method based on the principle of amplitude comparison

A technology based on the principle of relay protection, applied in the field of power systems, can solve problems such as differential sensitivity and large current phase difference, and achieve the effect of increasing the operating speed

Active Publication Date: 2017-03-29
BEIJING SIFANG JIBAO AUTOMATION +1
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0005] The invention aims to solve the sensitivity problem of differential protection when the current phase difference on both sides of the protected equipment is large

Method used

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  • Relay protection method based on the principle of amplitude comparison
  • Relay protection method based on the principle of amplitude comparison

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Embodiment Construction

[0021] Specific implementation plan

[0022] The technical solutions disclosed in the present invention will be described in further detail below in conjunction with the drawings of the specification and specific examples.

[0023] Such as figure 1 Shown is the flow chart of the relay protection method based on the amplitude comparison principle of the present invention.

[0024] Taking the fault characteristics of a transmission line as an example, the technical scheme of the present invention is explained. The relay protection method of the amplitude comparison principle of the present invention includes the following steps:

[0025] Step 1: Use the feature that the current amplitude is equal when the external short-circuit occurs, according to the protection installation location ( figure 2 The instantaneous value of the current measured by the current transformer TA in the middle m and n) is filtered and calculated.

[0026] Step 2: And use the communication method to obtain the c...

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Abstract

The invention relates to an amplitude comparison principle-based relay protection method. A protection apparatus carries out sampling filtering on a current waveform of a mutual inductor by utilizing a feature that current amplitudes are equal in an external short circuit state; currents at two sides of protected equipment are obtained by using a communication way; and on the basis of comparison of the two-side current amplitudes, the amplitude comparison principle-based relay protection method is formed. According to the relay protection method, enough security is provided for an external fault and enough sensitivity is provided for an internal fault; and the requirement for consistency of fiber channel route is loosened. The influence of the system equivalent impedance angle difference at the two sides of the fault point can be eliminated. And when a fault occurs at power angle spreading at the two sides of the system during oscillation, the amplitude comparison principle-based relay protection method can realize the good performance. Therefore, the provided amplitude comparison principle-based relay protection method has the wide application space and can be widely applied to transmission line protection, generator protection, transformer protection, and bus protection and the like.

Description

Technical field [0001] The invention belongs to the field of electric power systems, and more specifically relates to a method of relay protection. Background technique [0002] In ultra-high voltage transmission lines, optical fiber differential protection has been widely used as the main protection. [0003] The principle of optical fiber differential protection is advanced, but the transmission and reception routes of the optical fiber channel are required to be consistent. The typical criterion of differential protection is based on the proportional braking differential between "phasor sum" and "phasor difference". If the transmission line has a fault in the area, if the system equivalent impedance angle difference on both sides of the fault point is large, or when the transmission system is oscillating, when the power angle of the system on both sides of the oscillation fails, the sensitivity of the traditional differential protection will be generated. To a certain extent, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H3/28H02H7/26
Inventor 黄少锋魏会利张月品伍叶凯赵月黄继伟
Owner BEIJING SIFANG JIBAO AUTOMATION
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