Method for manual switching automatic judgment under condition of different-network power supplies serving as station service power supplies

Abstract

The invention discloses a method for manual switching automatic judgment under the condition of different-network power supplies serving as station service power supplies and aims to mainly solve theproblem of equipment tripping caused by the fact that a switching mode steps into synchronous switching or long-delay switching under the condition of different-network power supplies serving as station service power supplies. The method comprises the following steps that: (1) whether the two different-network power supplies can be quickly switched through the automatic starting of a quick switching device, and a starting mode of the quick switching device is selected; (2) a quick switching device manual starting quick switching judgment condition is added into manual switching logic in the logic configuration of a DCS; and (3) during manual quick switching operation, the DCS automatically captures a quick switching device manual quick switching judgment condition and automatically issuesa manual starting quick switching logic. According to the method of the invention, through the existing signal output function of the quick switching device and on the basis of the manual logic modification of the DCS system, automatic quick switching selection in a manual mode is realized, and the power-off time during the switching of the two different-network power supplies is reduced, and theabnormal tripping probability of auxiliary equipment of a power plant is greatly reduced.

Description

technical field [0001] The invention relates to the technical field of power supply switching, in particular to a method for automatically judging that the factory power supply is a power supply of a different network for manual switching. Background technique [0002] In power plants, the safety and reliability of plant power is directly related to the safe operation of generator sets, power plants and even the entire power system. In the past, most of the factory power switching used the auxiliary contact of the working power supply to start the standby power supply directly (or via a low-voltage relay or a time-delay relay). This method has not been verified synchronously, and the motor is vulnerable to impact. When the standby power supply is turned on, the phase angle difference between the residual voltage of the busbar and the voltage of the standby power supply is close to 180°, which will cause excessive impact on the motor. If after a delay, wait until the residu...

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Problems solved by technology

[0006] The purpose of the present invention is to provide a method for automatic judgment of manual switching of the factory power supply as a different network power supply, which mainly solves the uncertainty of the initial phase angle of the two different network power supplies when the existing backup power supply is a different network power supply. The problem that caused the switching mode to step into synchronous switching or long-delay switching to cause equipment tripping

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