A method of limiting 220kv short-circuit current in substation

Abstract

The invention provides a method for restricting a 220KV short circuit current of a transformer substation and relates to a power system. The method comprises the steps of calculating a short circuit current condition in a 220KV system of a transformer substation; selectively performing short connection of partial 220KV outgoing wires outside the transformer substation via circuit breakers; limiting short circuit currents flowing through the 220KV circuit breakers of the transformer substation to be below a rated breaking current to guarantee a faulty line can be cut off smoothly; disconnectingthe circuit breakers used for outgoing wire short connection outside the transformer substation on the basis and restoring the power supply to the 220KV outgoing wires without faults. The method caneffectively restrict short circuit currents of 220KV lines of transformer substations and has the advantages of high power supply reliability, simple implementation and low cost.

Description

Technical field [0001] The invention relates to a power system, in particular to a method for limiting 220KV short-circuit current in a substation, which is mainly suitable for effectively limiting the short-circuit current of 220KV lines in a substation, and has high power supply reliability, simple implementation and low cost. Background technique [0002] The safe and stable operation of the power grid is a prerequisite for ensuring reliable power supply for users. In order to limit the fault to a certain range, the fault is isolated by the circuit breaker, which can effectively avoid the occurrence of large-scale blackout accidents. However, with the strengthening of grid interconnection, the rapid development of user load levels and the gradual construction of power points of the power grid, short-circuit current problems in local areas of the power grid have become increasingly prominent. For some 220kV substations with a large number of outgoing lines and heavy loads, the...

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Problems solved by technology

[0009] The purpose of the present invention is to overcome the defects and problems existing in the prior art of limiting the short-circuit current of the 220KV line of the substation, the low reliability of power supply, complicated implementation, and high cost, and to provide a method that can effectively limit the short-circuit current of the 220KV line of the substation , and the method of limiting the 220KV short-circuit current of the substation with high power supply reliability, simple implementation and low cost

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