Pressure switch is an important primary signal element in thermal power unit protection system. The accuracy, reliability and rapidity of the pressure switch measurement directly determine the correct and fast operation of the power plant protection system. Aiming at the shortcomings of mechanical pressure switch and pressure transmitters as protection elements, this paper designsed a two-wire intelligent digital display pressure switch with low power consumption and high reliability according to the design principles of protection, regulation and monitoring. The reliability design and test of the intelligent pressure switch was carried out. The test results show that the pressure switch can effectively solve the problems of jamming, offset, non-monitoring and non-prediction existing in the traditional pressure switch, and has obvious advantages of low power consumption, high reliability, high precision and calibration-free, which provides a fundamental and effective guarantee for the reliability of the power plant protection system.
