A cems dual power switching control loop

Abstract

The invention provides a CEMS dual-power-supply switching control loop. A CEMS power supply main line is connected with a security section power supply through a normally-open auxiliary contact KM1-1 of an AC contactor KM1 and a switch K1 in sequence; and a normally-closed auxiliary contact KM2-2 and the AC contactor KM1 are connected in series and then, are connected in series with L1 and N1 of the security section power supply between the normally-open auxiliary contact KM1-1 and the switch K1. Through interlocking power supply of a UPS power supply and the security section power supply, CEMS dual-power-supply switching is ensured, thereby solving the problem that key equipment is restarted due to power failure when a single power supply fails; meanwhile, by increasing large-power load, the control loop is delayed, thereby preventing the problem that since the power of the key equipment in the loop is small, other large-power accessory equipment snatches the current in the switching moment, and the key equipment needs to be restarted; and a CEMS dual-power-supply switching effect is realized.

Description

technical field [0001] The invention belongs to the technical field of thermal power generation, and in particular relates to a CEMS dual power supply switching control loop. Background technique [0002] The continuous flue gas monitoring system, referred to as CEMS, is an indispensable part of the flue gas desulfurization system in thermal power plants and an important guarantee for the good work of the flue gas desulfurization system. The single-channel security section 220V power supply used before the power supply transformation of our company's CEMS chamber. Often due to unit mediation or bus power switching in the security section, the upper computer of the CEMS system and the Siemens U23 gas analyzer are restarted due to a momentary power failure. The Siemens U23 instrument will have a warm-up time of about 30 minutes each time it is restarted. Restarting may cause damage to the PAS-DAS software file, resulting in loss of configuration files, resulting in loss of up...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the above-mentioned technical problems, the present invention provides a CEMS dual-power switching control loop. The CEMS dual-power switching control loop uses UPS power supply and security section power supply for interlocking power supply, which solves the problem of important equipment when the single power supply fails. The problem of restarting due to power failure; at the same time, by adding a high-power load delay control loop, the problem of high-power equipment grabbing current and causing important equipment to restart during dual power switching is solved.

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