In order to improve the DCS temperature protection logic

improve the reliability of the temperature protection in the thermal power plant

so as to reduce the temperature protection error action

no action caused by the unit non-stop or the unit equipment damage. Through the research and analysis of the temperature protection logic of a power plant

the logic shortcomings and desirable disadvantages are found from the perspective of logic optimization

and the logic shortcomings are optimized

so as to improve the reliability of temperature protection. The study found that the reset end of the RS trigger of temperature protection is generally automatic reset

but when the temperature remains high

after the automatic reset

the protection will trigger

resulting in non-stop accidents of the unit. By changing the reset end logic of the RS trigger

the reset output of the temperature data is only restored to the value nearly before the temperature mutation

i. e.

the temperature is restored to the original level

and the reliability of the temperature quality judgment is logically improved. The experimental results show that when the temperature is suddenly increased

the protection action will not be triggered for how long

which greatly improves the reliability of temperature protection

and the temperature protection misaction rate drops from 5% to 0%.