Protection method for preventing refusing action of small steam turbine

Abstract

The invention provides a protection method for preventing refusing action of a small steam turbine. The protection method comprises the steps that the control logic of DCS software is modified, the first reset redundant signal is firstly added, then the first abnormal intelligent reminding and alarming signal is added, and finally the small engine trip logic judgment signal is added. By means of the method, the control system logic is improved, so that the problem that a trip First functional block is unreliable is solved, a protection system with protection and first out separated is provided, the thought of protection design can be suitable for various DCSs, and the reliability of the protection system can be improved; and the possibility of protection refusing action caused by the situation that the First functional block is halted, logic design is incomplete, operation of operating personnel is lack of standardization, and logic constraints of hot control maintenance personnel arelack of standardization can be reduced; it is ensured that protection logic can be automatically triggered when parameters of the small steam turbine system are abnormal; equipment is linked in emergency; fault losses are reduced to the greatest extent; and it can be ensured that remote manual switching off of the operating personnel can succeed at a time, and the field crisis can be defused in time.

Description

Technical field [0001] The invention belongs to the technical field of steam turbine protection, and specifically relates to a protection method for preventing a small steam turbine from refusing to operate. technical background [0002] The thermal protection system is an indispensable and important system for thermal power generating units. The stability and reliability of thermal protection plays an important role in the reliability and safety of the main and auxiliary equipment of the unit. The function of thermal protection When auxiliary equipment has abnormal parameters, make correct judgments and take timely measures to protect the equipment through the control of automatic emergency linkage equipment, thereby reducing the scope of the unit or equipment failure and avoiding major accidents and equipment damage. [0003] In actual production, due to the imperfect logic design of the system, there are many loopholes, and there have been many small steam turbine protection fai...

AI Technical Summary

Problems solved by technology

[0003] In actual production, due to the imperfect system logic design, there are many loopholes, and there have been many problems that the protection of small steam turbines refused to operate, and remote brakes failed. Logic, which causes the trip first-out function block to fail to trigger the trip signal again; 2: For the XDPS-400+Xinhua DCS system, after the maintenance personnel forcibly trips the first out of the First function block, the function block "crashes" and cannot normally trigger the output trip signal; 3 : When XDPS-400+ Xinhua DCS system cards and other hardware faults are being repaired online, in order to avoid equipment misoperation, all trigger signals are forced, but it may cause the input signal to change and cause the first trip function block to fail to trigger the trip signal again, which affects the Safe and stable operation of the unit

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