A method and system for automatically switching on vacuum protection of a steam turbine

Abstract

The invention discloses an automatic vacuum protection executing method and system of a steam turbine. The method comprises the steps that the rotation speed of the steam turbine is collected; whether the rotation speed of the steam turbine is larger than the preset rotation speed threshold value or not is judged; if the rotation speed of the steam turbine is larger than the preset rotation speed threshold value, whether the vacuum pressure of the steam turbine reaches a first vacuum limiting value or not is judged; if the vacuum pressure of the steam turbine reaches the first vacuum limiting value, the steam turbine is controlled to trip; if the rotation speed of the steam turbine is not larger than the preset rotation speed threshold value, whether the vacuum pressure of the steam turbine reaches a second vacuum limiting value or not is judged, wherein the second vacuum limiting value is larger than the first vacuum limiting value; and if the vacuum pressure of the steam turbine reaches the second vacuum limiting value, the steam turbine is controlled to trip. Vacuum protection is executed after turbine sets of the steam turbine operate normally and when the steam turbine is in other operation processes, important protection on the turbine sets of the steam turbine is executed, the vacuum protection is also executed during the whole process, and the safety of the steam turbine is improved.

Description

technical field [0001] The invention relates to the field of mechanical automation, in particular to a method and system for automatically starting vacuum protection of a steam turbine. Background technique [0002] Electric energy is an indispensable product in people's life and work. At present, large-scale power generation places such as power plants usually use steam turbines to drive generators to generate electricity. [0003] The so-called steam turbine refers to an external combustion rotary machine that converts steam heat energy into mechanical work. In order to ensure the safety of the steam turbine operation, the steam turbine is equipped with a low vacuum protection function to avoid damage to equipment such as excessive exhaust temperature caused by low vacuum, leakage of condenser copper tubes, and upward movement of the center of the low-pressure rotor. However, the current steam turbine unit, especially the low vacuum protection of the 300MW unit, is manual...

AI Technical Summary

Problems solved by technology

One group of vacuum switches 1, 2, 3, and 4 uses 4 pressure switch signal inputs on the spot, and enters the ETS (steam turbine trip protection system) panel as 63-1 / LV1, 63-2 / LV1, 63-3 respectively / LV1, 63-4 / LV1; Each group of signal input has a dial switch at the ETS terminal. Before the unit starts, turn the four sets of switches to the "OFF" position, and then turn the dial switch to "ON" after the unit is in normal operation. ", that is, the low-vacuum protection is turned off before the unit is started, and it is turned on after the unit is started, but this is easy to cause misoperation and important protections are turned on or not turned on

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