A self-adaptive single-phase reclosing method for 220kv transmission lines

A single-phase reclosing, transmission line technology, applied in circuit devices, emergency protection circuit devices, electrical components, etc. The effect of reducing shock and improving stability

Active Publication Date: 2022-06-28
STATE GRID JIANGSU ELECTRIC POWER CO LTD SUQIAN POWER SUPPLY BRANCH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide an adaptive single-phase reclosing method for 220kV transmission lines in view of the above disadvantages. For permanent faults, only the circuit breaker on one side of the line is reclosed, which solves the problem of single-phase reclosing in one of the 220kV double-circuit transmission lines. After a permanent fault, due to the asynchrony of the opening and closing time of the circuit breakers on both sides, the attenuated DC component of the adjacent non-faulty line will cause CT saturation, which will cause the protection misoperation of the non-faulty line

Method used

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  • A self-adaptive single-phase reclosing method for 220kv transmission lines
  • A self-adaptive single-phase reclosing method for 220kv transmission lines
  • A self-adaptive single-phase reclosing method for 220kv transmission lines

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Embodiment

[0053] Example: Simulation Verification Experiment

[0054] Established using PSCAD / EMTDC such as figure 1 The 220kV double-ended network simulation model shown, in which the M side system is a large power supply, the N side is a small power supply, the total length of the line is 30km, and the transmission line is a Bergeron model. The parameters are: positive sequence impedance per unit length 0.041+j0.2953 ( Ω / km), zero-sequence impedance per unit length 0.2031+j0.7369 (Ω / km), positive-sequence capacitance per unit length C 1 =0.0128μF / km, zero sequence capacitance C 0 =0.0075μF / km. Main transformer parameters: auto-coupling step-down transformer, rated capacity 334 / 334 / 100MVA, short-circuit impedance high-medium: 19.7%, medium-low: 38.71%, high-low: 64.81%. Set T1 to 0.8 seconds and T2 to 0.1 seconds. According to the above parameters, the calculated amplitudes of N-side negative-sequence current and zero-sequence current are 114.5A and 229A respectively. Therefore, th...

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Abstract

The invention belongs to the technical field of electric power system relay protection, and in particular relates to an adaptive single-phase reclosing method for a 220kV transmission line. The method includes 1. When a single-phase fault occurs on the transmission line, the circuit breaker of the faulty phase on both sides of the transmission line is tripped after phase selection of the line protection; After opening, after the reclosing time T1, first reclose the main power side of the transmission line; 3. Said to reclose the M side of the first side, if it recloses on a permanent fault, trip the three-phase circuit breaker; if it is a transient fault, the circuit breaker Reclosing is successful; 4. After weighing the reclosing side N side, before the circuit breaker recloses, use the time difference between the reclosing time of the M side and the N side to judge whether the fault is a permanent fault; 5. If it is judged that the fault on the N side is a permanent fault, then N The side locks and recloses and trips the three-phase circuit breaker; if it is judged that the fault on the N side is an instantaneous fault, the circuit breaker is reclosed after a short delay T2.

Description

technical field [0001] The invention belongs to the technical field of power system relay protection, and in particular relates to an adaptive single-phase reclosing method for 220kV transmission lines. Background technique [0002] The circuit breaker of 220kV transmission line adopts split-phase operating mechanism, and the single-phase fault of overhead transmission line accounts for more than 70%, so single-phase reclosing is adopted. At present, the main protection of domestic 220kV transmission lines is optical fiber current differential protection. [0003] The 220kV transmission network uses a large number of double-circuit lines on the same pole. When a single-phase fault occurs in one of the lines, the single-phase reclosing action is performed. At present, the setting time of the single-phase reclosing on both sides of the line is the same, but due to the inconsistent characteristics of the circuit breaker mechanism , the opening and closing times of the circuit ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/26H02H3/06G01R31/08
CPCH02H7/26H02H3/066G01R31/085
Inventor 徐成万新强沈平侯贵宝葛蕾薛飞钱欣胡红胜
Owner STATE GRID JIANGSU ELECTRIC POWER CO LTD SUQIAN POWER SUPPLY BRANCH
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