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Relay Protection Method for UHV AC Transmission Line

A technology for UHV AC and transmission lines, applied in emergency protection circuit devices, electrical components, etc., can solve problems such as enhancing the impact of faults on power grid stability, and achieve the effect of correct and reliable identification

Active Publication Date: 2017-01-18
STATE GRID PUTIAN ELECTRIC POWER SUPPLY +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the impact of non-full-phase operation on system stability is far less than that of three-phase tripping, the action strategy of tripping three-phase lines by zero-sequence current differential protection will strengthen the impact of faults on grid stability

Method used

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  • Relay Protection Method for UHV AC Transmission Line
  • Relay Protection Method for UHV AC Transmission Line
  • Relay Protection Method for UHV AC Transmission Line

Examples

Experimental program
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Embodiment Construction

[0034] figure 1 It is a schematic diagram of a UHV AC transmission line fault applying the method of the present invention. The fundamental frequency electrical quantities of UHV AC transmission lines at the protective installations of the m-side substation and the n-side substation are respectively measured by the phase measurement unit (PMU) installed in the two substations. The synchrophasor measuring unit measures the sudden changes in the positive sequence voltages of A, B, and C phases at the protective installation of the UHV AC transmission line in the m substation A, B, C phase positive sequence current sudden change Measure the sudden change of positive sequence current of phase A, B, and C of UHV AC transmission line at n substation protection installation

[0035] The synchronized phasor measuring unit measures the negative sequence voltages of A, B, and C phases of UHV AC transmission lines at the protective installation of substation m A, B, C phase neg...

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Abstract

The invention discloses an ultra-high voltage alternating-current transmission line relay protection method. Firstly, A-phase, B-phase and C-phase positive sequence voltage leaps, a positive sequence current leap, negative sequence voltage and negative sequence currents of one end of an ultra-high voltage alternating-current transmission line are measured; by means of a distribution parameter model, A-phase, B-phase and C-phase positive sequence current leaps and negative sequence currents at the other end of the ultra-high voltage alternating-current transmission line are calculated, A-phase, B-phase and C-phase mixture coefficient component differential current amplitudes are calculated respectively, then a mixture coefficient component differential coefficient matrix is calculated, and according to sequencing of elements of the mixture system component differential coefficient matrix, a fault phase of the ultra-high voltage alternating-current transmission line is judged. The method is not influenced by distribution capacitance currents, is suitable for any voltage class, especially suitable for the ultra-high voltage alternating-current transmission line and suitable for relay protection within two cycles after the fault of the ultra-high voltage alternating-current transmission line occurs, and motion performance is not influenced by transition resistance and load currents.

Description

technical field [0001] The invention relates to the technical field of electric power system relay protection, and in particular relates to a method for relay protection of UHV AC transmission lines based on a hybrid system component differential coefficient matrix. Background technique [0002] At present, China has built the world's first officially grid-connected Jindongnan-Nanyang-Jingmen 1000kV UHV AC transmission line. According to the State Grid Corporation's "Unified Strong Smart Grid Research Report", China will build 39,000 kilometers of UHV AC transmission lines by 2015, and 47,000 kilometers of UHV AC transmission lines by 2020. The backbone grid structure, the national grid pattern of coordinated development of power grids at all levels. [0003] The UHV AC transmission network can greatly increase the power transmission capacity, alleviate China's tight transportation situation, help reduce transmission loss, save transmission costs, save energy and reduce emi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/26
Inventor 曾惠敏林富洪
Owner STATE GRID PUTIAN ELECTRIC POWER SUPPLY
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