Method and system for avoiding same-tower multi-loop vertical connection zero sequence direction protection maloperation

A zero-sequence direction, multi-circuit technology on the same tower, which is applied in the direction of emergency protection circuit devices, emergency protection devices with automatic disconnection, electrical components, etc., can solve the problems of no complete solution, non-compliance with technical standards, sound circuit malfunction, etc. question

Active Publication Date: 2019-02-01
CHINA ELECTRIC POWER RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In multi-circuit lines with the same tower and same pressure, after a non-full-phase operation or disconnection fault occurs in the first circuit, the busbars on both sides of the transmission line will have zero-sequence voltages with opposite phases. voltage compensation, it will cause malfunction of the healthy line
At the same time, the load transfer caused by non-full-phase operation or disconnection fault is likely to cause overload of other lines, and there is also the p

Method used

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  • Method and system for avoiding same-tower multi-loop vertical connection zero sequence direction protection maloperation
  • Method and system for avoiding same-tower multi-loop vertical connection zero sequence direction protection maloperation
  • Method and system for avoiding same-tower multi-loop vertical connection zero sequence direction protection maloperation

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Embodiment 1

[0070] figure 1 It is a flow chart of a method for preventing maloperation of longitudinal zero-sequence directional protection of multi-circuit lines on the same tower according to a preferred embodiment of the present invention. Such as figure 1 As shown, the method 100 for preventing the zero-sequence directional protection maloperation of the longitudinal connection of multi-circuit lines on the same tower described in this preferred embodiment starts from step 101 .

[0071] In step 101, set the station area information to be received for the zero-sequence directional protection device of each circuit in the multi-circuit line on the same tower, and input the pre-measured positive-sequence impedance, zero-sequence impedance and zero-sequence impedance of each circuit. Mutual inductance, wherein the station domain information includes three-phase phase current measurement values, three-phase phase voltage measurement values, circuit breaker switch status and multi-circuit...

Embodiment 2

[0127] In this preferred embodiment, a real-time digital simulator RTDS (Real Time Digital Simulator) is used to establish a simulation model of double-circuit lines with the same tower and same pressure. The length of each circuit is 100km, and the system voltage level is 500kV. Impedance parameters are shown in Table 1:

[0128] Table 1 System parameters of multi-circuit simulation model on the same tower

[0129]

[0130] image 3 It is a schematic diagram of zero-sequence voltage distribution when a disconnection fault occurs on a double-circuit line with the same tower and the same voltage according to another preferred embodiment of the present invention. Such as image 3 As shown, in this preferred embodiment, the same-tower and same-pressure double-circuit line includes a C1 loop and a C2 loop, and the two sides of the loop are the M-side system and the N-side system respectively. The distance between the C1 return line and the M-side system protection installat...

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Abstract

The present invention provides a method and a system for avoiding same-tower multi-loop vertical connection zero sequence direction protection maloperation. The method and the system are based on station domain information, it is determined whether there is a loop with faults or not through determination of whether a first criterion is established, it is determined whether loops except the fault loops in the multiple loops with voltage levels having faults have zero sequence voltage zero-crossing points or not according to a second criterion, and when loops except the fault loops in the multiple loops with voltage levels having faults have zero sequence voltage zero-crossing points, the reverse compensation is performed; it is determined whether loops with voltage levels without faults have zero sequence voltage zero-crossing points or not according to a third criterion in a same-tower mixed voltage multiple loops, and if yes, the vertical connection zero sequence protection is closed.The method and the system completely solve the problems of the same-voltage and mixed voltage multi-loop vertical connection zero sequence direction protection maloperation of the same tower caused by open-phase operation or break line faults and ensure the precision of the vertical connection zero sequence direction protection so as to improve the electric system maloperation capacity and the power grid safe and stable operation level.

Description

technical field [0001] The present invention relates to the field of electric power protection, and more specifically, relates to a method and system for preventing maloperation of longitudinal zero-sequence direction protection of multi-circuit lines on the same tower. Background technique [0002] The multi-circuit line on the same tower has the characteristics of less number of towers, small area of ​​transmission corridor, strong transmission capacity, and large path width. It can avoid redundant projects that must be implemented when passing through mountains and cities. Back-to-back transmission lines have significant economic advantages while also meeting the requirements for high-capacity transmission. In multi-circuit lines on the same tower, the application of longitudinal zero-sequence directional protection is quite extensive and the technology is mature. In the prior art, the longitudinal zero-sequence protection should not be affected by the magnitude of the z...

Claims

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Application Information

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IPC IPC(8): H02H7/26H02H3/05
CPCH02H3/05H02H7/26H02H7/267
Inventor 戴飞扬王兴国杨国生周泽昕
Owner CHINA ELECTRIC POWER RES INST
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