Power supply control device for remote I/O (input/output) cabinet of circulating pump

Abstract

The invention relates to a power supply technology for a remote I / O (input / output) cabinet of a circulating pump of a power plant unit, in particular to a power supply control device for a remote I / O cabinet of a circulating pump. Through adopting an inverter for replacing a UPS (uninterrupted power supply) device, a path of power supply from a chemical water direct current screen is added, so that three-path power supply for the remote I / O cabinet of the circulating pump is realized, the safety potential hazard of important equipment power supply systems is completely eliminated, the reliability of the remote I / O cabinet of a DCS system of a large-scale thermal power plant generator set is improved, the safety of common system equipment of the power plant set is ensured, the service life of the equipment is prolonged, the power production cost of the power plant is reduced, and obvious economic benefit is obtained.

Description

technical field [0001] The invention relates to a power supply technology for a remote I / O cabinet of a circulating pump of a power plant unit, in particular to a power supply control device for a remote I / O cabinet of a circulating pump. Background technique [0002] In the prior art, the DCS control system or large PLC control station must keep the circulation pump room, air compressor room, fuel pump room, and coal bunker away from the main workshop or the main control station, and then through the remote I / O cabinet mode for remote control. However, because the remote I / O cabinets are generally built far away from the main factory building or the main control station, it is difficult to connect to the reliable UPS and the two-way power supply of the security section; therefore, the power sources of the remote I / O cabinets are generally They all use local and nearby electricity, which will lead to a decrease in the reliability of the remote I / O cabinet power supply, and ...

AI Technical Summary

Problems solved by technology

In this power supply mode, when a temporary water pump needs to be added to pump water in the pump room, power is taken from the MCC power supply of the pump room and the temporary water pump is used. However, due to the grounding phenomenon of the water pump, the upper switch of the MCC power supply of the pump room Trip, the two MCC power supplies lose power at the same time, the remote I / O cabinet of the circulation pump room loses power, and the UPS loses power supply capacity due to long use time, making the four circulation units corresponding to the power plant units monitored by the remote I / O cabinet The pump is out of monitoring and control, which poses a major threat to the safe operation of the power plant unit; at the same time, because the pump room is far away from the main workshop or main control room, if it takes power from the security section and UPS like the host DCS cabinet, on the one hand, the cable is too long, and the construction Difficult and costly; on the other hand, due to the long distance, the voltage drop is too large, the power supply voltage supply is insufficient or a large cost needs to be invested to meet the power supply demand

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