Surface-protection type switching station fault judging method

A technology for fault judgment and opening and closing. It is applied in the direction of emergency protection circuit devices and electrical components. It can solve problems such as power outages, difficulty in setting the value of relay protection devices, and faults that cannot be quickly removed, so as to achieve convenient maintenance and ensure power supply quality. , the effect of simple method

Inactive Publication Date: 2006-12-27
郭建厂
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Problems solved by technology

However, this requirement brings great difficulty to the value setting of the relay protection device, resulting in that when an actual fault occurs, the fault of the next level cannot be removed quickly, and instead the switch of the upper level or the main switch of the switching station trips. causing widespread power outages

Method used

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  • Surface-protection type switching station fault judging method
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  • Surface-protection type switching station fault judging method

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Embodiment Construction

[0008] The technical scheme adopted by the present invention to solve its technical problem is: the fault current signal is sent to the PLC program controller through the current activation element current sensor; the PLC determines the source of the fault current according to the logical relationship sequence. When a user fails at the switching station level, all levels of switches between the switching station and the user will have fault currents, then the fault current signal criterion sent to the PLC is "1", and the rest have no fault current The passed switch criterion is "0", which is also sent to the PLC. At this time, the PLC makes a logical judgment and concludes: the fault occurred after the last switch with a criterion of "1", just disconnect the switch with the closest criterion of "0" and a criterion of "1". The switch is a vacuum circuit breaker, and the current starting element is a current sensor.

[0009] As shown in the figure, an example is as follows:

[0010]...

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Abstract

The related fault decision method for switching station of 12KV-40.5KV power supply system comprises: starting current sensor to send fault signal to a PLC to decide the current source as logic order; for fault from switching station, sending fault current signal criterion as '1', or else as '0' to PLC; using PLC to obtain conclusion: breaking the switch with criterion as '1' and away nearest distance to one with criterion as '0'. This invention has well accuracy on decision, and convenient to maintain.

Description

(1) Technical field [0001] The invention relates to a fault judgment method for a surface protection type switching station of a 12kV-40.5kV power supply system. (2) Background technology [0002] The opening and closing station is an extension and extension of the substation of the power supply system, and it is responsible for the task of directly distributing electric energy to the electric power department, and its application is very wide. Existing 12kV~40.5Kv switching devices use time-limited overcurrent relay protection devices to ensure the "selectivity" and "quick action" of the upper and lower relay protection inside the switching station. At present, the difference in the action time limit between the upper and lower levels of protection is 0.5S~0.7S, that is, when the same fault current passes through the upper and lower protection devices, the protection action time of the upper level should be 0.5S~0.7S longer than the next level. Make the lower-level power switch ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/26
Inventor 郭建厂
Owner 郭建厂
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