Locking method for switches of hand-in-hand auxiliary power supply system

Abstract

The invention discloses a locking method for switches of a hand-in-hand auxiliary power supply system. According to the locking method, a station service power system of a first unit and a station service power system of a second unit are included; the station service power system of the first unit comprises a high-voltage transformer of the first unit, a 6-kV working incoming line switch of the first unit, a 6-kV IA section bus of the first unit, a 6-kV IA section bus voltage transformer of the first unit and a 6-kV standby incoming line switch of the first unit; and the station service power system of the second unitcomprises a high-voltage transformer of the second unit, a 6-kV working incoming line switch of the second unit, a 6-kV IA section bus of the second unit, a 6-kV IA section bus voltage transformer of the second unit and a 6-kV standby incoming line switch of the second unit. According to the system and the method, the switching-on logic of the working incoming line switch and the standby incoming line switch of each unit in a DCS can be modified, so the switching-on among the switches can be realized, and the non-synchronous false switching-on condition of auxiliary power supply switches can be avoided.

Description

technical field [0001] The invention belongs to the technical field of electric power debugging and electric power testing, and relates to a locking method of a factory power supply system switch in a hand-in-hand manner. Background technique [0002] The factory system of a conventional power plant is powered by the factory working power supply and the factory standby power supply. The hand-in-hand mode means that the high-factory substations of the two units provide backup power to each other, and no starting-up substation is installed. [0003] The hand-in-hand wiring method appeared in the design of some thermal power plants very early, and it can be reliably completed after many accidents. At present, most of the plant-use systems of newly built gas-fired power plants are designed in a hand-in-hand way, and no start-up and standby changes are designed. The factory systems of the two units provide backup power for emergency shutdown and shutdown maintenance through han...

AI Technical Summary

Problems solved by technology

In special cases such as charging of the connecting busbar in the factory-use section of two units or failure of the quick-cutting device, manual operation is required to complete hand-in-hand power supply to the other unit. At this time, the working incoming line and standby incoming line switch of the same unit need to pass DCS Therefore, there is no hard-wiring lock between the working incoming line and the standby incoming line. In this case, it may occur that the power switch of the plant is not closed in time.

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