Method for accelerating discrimination reclosing route selection based on two sides TV

A discrimination method and reclosing technology, applied in the direction of automatic disconnection of emergency protection devices, electrical components, circuit devices, etc., can solve problems such as malfunction and unfavorable stable operation of the power system, to avoid malfunction, the principle is simple and reliable, The effect of improving operational stability

Active Publication Date: 2008-06-18
NANJING GUODIAN NANZI POWER GRID AUTOMATION CO LTD
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Problems solved by technology

However, most of the 3/2 wiring forms use single-phase reclosing, without checking the synchronization and no-voltage criteria
The existing reclosing acceleration logic is that after the intermediate circuit breaker recl

Method used

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  • Method for accelerating discrimination reclosing route selection based on two sides TV

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Embodiment Construction

[0025] In the power system, the busbar connection form of substations above 220kV is mostly 3 / 2 connection mode, as shown in Figure 1. According to the relevant requirements of the State Grid Corporation, the recloser is configured according to the circuit breaker, that is, each circuit breaker on the 3 / 2 string is equipped with a set of recloser devices.

[0026] When a fault occurs on the line, the line protection will trip the two circuit breakers corresponding to the line at the same time. After successful tripping, the circuit breaker is reclosed under the control of the reclosing device. Usually, the reclosing time of the reclosing device corresponding to the intermediate circuit breaker and the side circuit breaker is inconsistent. The setting value of the reclosing time of the side circuit breaker is short, and the setting value of the reclosing time of the middle circuit breaker is longer, so that the side circuit breaker can be closed first, and the middle circuit b...

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Abstract

The invention relates to a reclosing route selection acceleration discrimination method which is based on the TV at two sides. Circuit voltage is first sampled for two circuits corresponding to a central circuit breaker by the reclosing device, and the memory voltages of the two circuits are calculated; if the memory voltage is lower than the valve value, the circuit is malfunctioned, and corresponding circuit is accelerated. Non-malfunctioned circuit is avoided to be accelerated. By dynamic test certification and the method, the reclosing device corresponding to the central circuit breaker can successfully discriminate the malfunction circuit between two circuits, prevents a reclosing from accelerating the circuit which has no malfunction when malfunction occurs, avoids the misoperation of the circuit protection device in acceleration state which is caused by closing impulse current, and improves the operation stability of electric system.

Description

technical field [0001] The invention belongs to the technical field of power system automation, and relates to a reclosing line selection acceleration discrimination method based on TVs on both sides. Background technique [0002] The operation experience of the power system shows that most of the faults of overhead lines are instantaneous, and the permanent faults are generally less than 10%. Therefore, after the fault is removed by the relay protection action, the arc will be automatically extinguished, and the insulation at the short circuit can be automatically restored in most cases. Therefore, automatically reclosing the circuit breaker not only improves the reliability of power supply and reduces the power failure loss, but also improves the transient stability level of the power system and increases the power transmission capacity of the high-voltage line. If reclosing occurs in a permanent fault, the protection device will act to open the circuit breaker without ti...

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Application Information

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IPC IPC(8): H02H7/26H02H3/06
Inventor 钱国明胡再超石文国
Owner NANJING GUODIAN NANZI POWER GRID AUTOMATION CO LTD
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