The Control Method of Realizing the Function of Emergency Protection System of Small Steam Turbine Unit

Abstract

The invention discloses a control method for realizing an ETS (emergency trip system) of a small-sized steam turbine set. The scheme adopted by the invention is that the control method mainly comprises the following steps: enabling a power supply, CPUs (central processing units) and communication hardware which form an automatic control system of a steam turbine to respectively adopt redundant backup configuration; enabling an ETS blockette to be integrated into the automatic control system of the steam turbine, and running alone independent of a main program; collecting steam turbine operation trip signals through an IO (input / output) module, and then, sending to two sets of CPUs and performing operation processing by using the ETS blockette; outputting a logic control judgment result obtained by the operation of a main CPU to a corresponding shutdown electromagnetic valve through a demand output (DO) card to realize the emergency trip function of the steam turbine. According to the control method disclosed by the invention, by utilizing the hardware hot spared redundancy of the automatic control system of the steam turbine, the emergency trip system function of the small-sized steam turbine set is realized; a control system does not need to be additionally arranged, and therefore, the number of cabinets is reduced, inter-system signal transmission is reduced, crossover lines between the cabinets are reduced, the signal loss probability is reduced, and the signals are more centralized.

Description

technical field [0001] The invention relates to the technical field of steam turbine emergency protection, in particular to a method for realizing the function of a steam turbine emergency protection system based on an automatic control system of a small steam turbine unit. Background technique [0002] The steam turbine emergency protection system (ETS, EMERGENCYTRIPSYSTEM) is a protection system used to monitor the operating parameters of the steam turbine. The operating parameters of the steam turbine include turbine overspeed, turbine vibration, generator vibration, axial displacement, cylinder expansion difference, and thrust pad temperature , radial tile temperature, condenser vacuum, lubricating oil pressure, generator-transformer protection action, ESC shutdown, manual emergency safety device, MFT action, etc., when the steam turbine operating condition parameters exceed the safety limit, the steam turbine emergency protection The system ETS will automatically close ...

AI Technical Summary

Problems solved by technology

[0004] 1. Realize the soft redundancy backup of two sets of control systems through software, and cannot realize the real hot standby non-disruptive switching function through reliable hardware equipment, the switching speed is relatively slow, and the safety level of steam turbine operation is not high; while the hot The cost of the redundant ETS system is too expensive and not suitable for small steam turbines;

[0005] 2. It cannot be combined with the analog quantity trend of the monitoring point to make a comprehensive intelligent judgment;

[0006] 3. Independently make logical judgments, see figure 2 , any system judges the shutdown output, that is, directly outputs to the scene, and the probability of malfunction is high;

[0007] 4. Design an emergency protection system independently of the steam turbine control system, and assemble it into a steam turbine emergency protection system control cabinet separately. The cost of the steam turbine control system is high

Images