A method for reclosing a multi-circuit line

Abstract

The invention discloses a multi-circuit line reclosing method. The method includes the following steps: setting the tripping mechanism as single-phase tripping for single-phase faults and three-phase tripping for multi-phase faults; collecting multi-circuit line information, comprehensively judging fault phase states and fault types; starting in sequence according to time sequence and fault types Reclosing of each circuit. The present invention identifies the fault type of the multi-circuit line system through information sharing, can avoid the impact on the system caused by the permanent fault between the phases of the device overlapping the line, solves the blind overlapping problem caused by the conventional single-phase reclosing of the ultra-high voltage line, and can greatly improve the transmission efficiency. The transmission capacity of the line is improved, the stability of the system is improved, and it has significant economic benefits.

Description

technical field [0001] The invention relates to the field of multi-circuit line reclosing methods, in particular to a multi-circuit line reclosing method. Background technique [0002] The multi-circuit lines on the same pole occupy narrow line corridors and have high economic value. Therefore, more and more transmission and transformation lines use the same-pole multi-circuit lines. The same-pole multi-circuit lines with voltage levels of 220kV and above are responsible for the large capacity of the system. The task of power flow transmission, its normal operation is of great significance to the stability of the power system. Since the multi-circuit lines of the same pole are installed on the same tower, the distance between the lines is relatively short, and cross-line faults may occur. When a cross-line fault occurs, the conventional single-phase reclosing will meet the cross-line permanent fault. , still manifested as a single-phase fault, but for the entire power syste...

AI Technical Summary

Problems solved by technology

Since the multi-circuit line on the same pole is installed on the same tower, the distance between the lines is relatively short, and a cross-line fault may occur. , is still manifested as a single-phase fault, but for the entire power system, it is no different from coincidence and multi-phase faults. The impact of coincidence on cross-line phase-to-phase faults is very large, and multi-circuit lines may jump faster after coincidence Open, resulting in a serious lack of power flow in the regional power grid, which has a serious impact on system stability and equipment operation, and may lead to system instability and damage to power equipment in extreme cases

[0003] At present, an adaptive reclosing switch suitable for double-circuit lines has been developed in China. Through optical fiber communication between double-circuit lines, all information of double-circuit lines is integrated, and phase-based reclosing technology is implemented. This technology is only applicable to double-circuit lines and cannot be applied. on multiple lines

[0004] For multi-circuit lines in Japan, multi-phase reclosing is adopted. This method can increase the probability of reclosing, but it cannot identify cross-line faults, and there are cases where reclosing is caused by multi-phase faults.

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