A steam turbine differential expansion protection control system

Abstract

The invention discloses a differential expansion protection control system for a steam turbine. The differential expansion protection control system for the steam turbine comprises a steam turbine protection action acquisition module, a differential expansion protection action acquisition module, a starting and stopping operation module, a first operation module, a second operation module and a control module, wherein the steam turbine protection action acquisition module is used for acquiring various steam turbine protection action commands; the differential expansion protection action acquisition module is used for acquiring a differential expansion protection action command; the starting and stopping operation module is used for outputting a starting and stopping logical command through logical operation of a steam turbine operating working condition signal and a trigger signal; the input end of the first operation module is connected with the starting and stopping operation module and the differential expansion protection action acquisition module, and the first operation module is used for conducting logical AND operation on the starting and stopping logical command and the differential expansion protection action command and outputting a first logical command; the input end of the second operation module is connected with the steam turbine protection action acquisition module and the first operation module, and the second operation module is used for conducting logical OR operation on the first logical command and the various steam turbine protection action commands; and the input end of the control module is connected with the first operation module and the second operation module.

Description

technical field [0001] The invention relates to the field of steam turbine protection, in particular to a steam turbine differential expansion protection control system. Background technique [0002] Differential expansion protection is an important protection for steam turbines. If it refuses to operate, it will directly cause damage to the steam turbine unit; if it malfunctions, it will affect the stable operation of the power grid and the direct and indirect economic losses of the enterprise. The installation and adjustment of the differential expansion sensor is completed in front of the steam turbine head cylinder, and the steam turbine cannot be adjusted during operation. When the steam turbine starts, shuts down, and changes load rapidly, the thermal inertia of the rotor and the cylinder to the high-temperature and high-pressure steam is different, which makes the metal expansion different, so there is a large differential expansion, although the operator can monitor...

AI Technical Summary

Problems solved by technology

First, the operation of the start-up and stop of the steam turbine is often complicated, and there are missing operations or deviations in the timing of operations, leaving hidden dangers for the protection of the steam turbine

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