A substation emergency protection method and device

Abstract

The invention discloses a substation emergency protection method. An emergency protection apparatus and a tripping circuit employ a double-source power supply mode; and an independent UPS energy storage power source and an original alternating-current and direct-current power source of a substation provide power simultaneously, so that the emergency protection apparatus can still protect the safety operation of the substation continuously even though the original alternating-current and direct-current power source of the substation fails to work. The substation emergency protection method comprises three parts of a protection inputting condition, a protection action condition, and a protection tripping method. The protection inputting condition is used for ensuring that emergency protection is only put into practice under the circumstance that the original secondary system loses power; the protection action condition is used for determining whether a fault needing tripping occurs in a primary system; and the protection tripping method is used for determining a tripping range after the protection action. With the emergency protection method and apparatus, a huge risk that is caused because the original protection device stops operation when the secondary system of the substation loses power can be eliminated.

Description

technical field [0001] The invention relates to an electrical protection method for a substation, in particular to an emergency protection method and device, which are used to solve the hidden danger of safe operation caused by the withdrawal of the original secondary protection system after the AC and DC power supply system of the substation loses voltage. Background technique [0002] Substation electrical primary equipment refers to high-voltage electrical equipment directly used in the production process of production, transmission and distribution of electric energy, including generators, transformers, circuit breakers, isolating switches, automatic switches, contactors, knife switches, busbars, transmission lines, Power cables, reactors, motors, etc. [0003] Substation electrical secondary equipment refers to the low-voltage electrical equipment required to monitor, control, adjust and protect the work of the primary system, such as relay protection, safety automatic ...

AI Technical Summary

Problems solved by technology

The disadvantages of this method are: 1) The voltage of the capacitor energy storage power supply mode decreases with the length of the power supply, and the quality of power supply cannot be guaranteed for a long time; 2) It does not consider the wrong input of emergency protection caused by the false alarm of the DC power supply disappearing signal; 3) Non-electricity protection function is not considered; 4) The tripping range of the emergency treatment device is not specified

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