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Equi-transmission instantaneous value differential protection method of microcomputer protection for remote transmission line

A transmission line, differential protection technology, applied in emergency protection circuit devices, electrical components and other directions, can solve the problems of low sensitivity, slow action speed, malfunction and so on

Active Publication Date: 2007-10-03
HUAZHONG UNIV OF SCI & TECH
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  • Summary
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Problems solved by technology

[0005] The purpose of the present invention is to provide a method of equal-transmission instantaneous value differential protection for long-distance transmission line microcomputer protection, which can solve the problems of long-distance transmission line protection, such as misoperation, low sensitivity and slow action speed

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  • Equi-transmission instantaneous value differential protection method of microcomputer protection for remote transmission line
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  • Equi-transmission instantaneous value differential protection method of microcomputer protection for remote transmission line

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[0022] Below in conjunction with accompanying drawing and example the present invention is described in further detail.

[0023] As shown in Figure 1, the concrete steps of the inventive method comprise:

[0024] (1) The voltage and current value of the transmission line collected;

[0025] As shown in FIG. 2 , the transmission line MN is a protected line, and the line protection devices are respectively located on both sides of the transmission line. Capacitive voltage transformers (CVT) are generally used for transmission lines with voltage levels of 500kV and above, as shown in Figure 3. Figure 4 is an equivalent circuit diagram of a capacitive voltage transformer. The primary voltage of the transmission line enters the protection device after being transformed by the actual CVT, and the primary current enters the protection device after being transformed by the current transformer. The electrical quantity signal entering the protection device passes through the two tran...

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Abstract

An equal transmission-variation instant value differential protecting method of remote electric transmission line microcomputer includes processing voltage and current sampling values by the same low-pass filtering treatment to obtain instant values of voltage and current, using voltage mutual inductor to process current sampling value to make primary electricity of transmission line and instant value used in differential protection-calculation be basically the same as transmission-variation link if voltage mutual inductor is applied on transmission line. The protecting method for transmission line with reactor is also disclosed.

Description

technical field [0001] The invention belongs to the relay protection technology of electric power system, and in particular relates to an equal-transmission instantaneous value differential protection method for long-distance power transmission line microcomputer protection. Background technique [0002] Long-distance transmission lines are generally long lines with a voltage level above 500kV. When an internal fault occurs, the relay protection device needs to quickly remove the fault to reduce the degree of accident damage. Differential protection is one of the main protections for lines with a voltage level above 500kV, and it can remove faults without delay. However, in order to ensure the correct, reliable and selective operation of the differential protection of long-distance transmission lines, a major obstacle must be overcome, that is, during external faults and normal operation, the distributed capacitive current of the transmission line should not cause the differ...

Claims

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Application Information

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IPC IPC(8): H02H7/26
Inventor 文明浩陈德树尹项根张哲
Owner HUAZHONG UNIV OF SCI & TECH
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