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Power transmission line backup protection method based on wide area information

A transmission line and backup protection technology, applied in the field of transmission line backup protection based on wide-area information, can solve the problems of few researches on backup protection, and achieve the effect of simple and reliable protection method, accurate fault removal, and high safety and stability

Active Publication Date: 2014-12-03
CHINA ELECTRIC POWER RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the backup protection based on wide-area information mainly focuses on preventing the distance protection section III from malfunctioning due to overload, and there are few researches on the backup protection based on the current differential as the basic principle by using wide-area information.

Method used

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  • Power transmission line backup protection method based on wide area information
  • Power transmission line backup protection method based on wide area information
  • Power transmission line backup protection method based on wide area information

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Embodiment Construction

[0029] The present invention will be further described below in conjunction with the drawings.

[0030] Such as Figure 1-Figure 3 As shown, a transmission line backup protection method based on wide area information, the protection method includes the following steps:

[0031] Step 1. The phasor measurement unit PMU or digital substation acquisition system collects the current at both ends of the transmission line connected between the substation and the adjacent substation And bus voltage Where m is the number of substations, U · 1 ′ = U · 2 ′ = · · · = U · m ′ = U · ;

[0032] Step 2. Calculate the differential current at both ends of the transmission line Bus differential current And wide area differential current

[0033] Step 3. If the current differential protection is activated, it is satisfied Then the circuit breakers i and i'at both ends of the transmission line are disconnected; if the current differ...

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Abstract

The invention provides a power transmission line backup protection method based on wide area information, which comprises the following steps that: current and bus voltage at the two ends of a power transmission line are acquired; differential current, bus differential current IX and wide area differential current at the two ends of the power transmission line are calculated; if a current differential protection device acts, circuit breakers at the two ends of the power transmission line are disconnected; if the current differential protection device refuses to act, the next step is executed; if both the wide area differential criterion and the bus differential criterion are satisfied, all circuit breakers on a bus are disconnected; if the wide area differential criterion is satisfied, and the bus differential criterion is not satisfied, the directions of directional elements at the two ends of the power transmission line are judged, and if the directions of the directional elements at the two ends of the power transmission line are positive, the circuit breakers at the two ends of the power transmission line are disconnected; and or else, the differential current, the IX and the IY at the two ends of the power transmission line are calculated. The invention has the beneficial effects that the power transmission line backup protection method can be taken as a back-up protection device of a main protection device of the line, and faulty lines can be quickly and accurately identified when the current differential protection device refuses to act.

Description

Technical field [0001] The invention belongs to the field of transmission lines, and specifically relates to a method for back-up protection of transmission lines based on wide-area information. Background technique [0002] The relay protection device is composed of multiple plug-ins such as CPU, binary input and output. A line protection device can realize multiple protection principles. The protection principles include main protection and backup protection. For ultra-high voltage transmission lines, the main protection is current Differential Protection. When the transmission line fails, the main protection quickly removes the fault. When the main protection fails, the backup protection removes the fault after a delay. Currently, the main protection of the UHV / UHV transmission line is the split-phase current differential protection, and the backup protection is the distance protection. The distance protection is affected by the overload. When the line load current increases ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/26H02H3/26
Inventor 王兴国周泽昕杜丁香周春霞
Owner CHINA ELECTRIC POWER RES INST
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