Shen Zhen West Power Plant

Keicher Technology in China

In 1997/1998 the Shen Zhen West Power Plant becomes a capacity addition of two 300 MW steam turbines. The hydraulic control system for the power turbines as well as for the four feedwater pump turbines was concepted from Keicher Engineering in alliance with the ABB power generation group of Switzerland.

Our concept

Based on protection of human life and high down time costs of power generation turbines, safety and reliability are major design aspects.

The redundant system architecture of Keicher system based on two independent hydraulic circuits. In case of a primary circuit failure the system automatically switch over to the second circuit.

To control the life steam valves for the main power turbine and feedwater pump turbines we developed new advanced control valve as well as stop valve actuators. Each of the actuators are double acting cylinders with a magnetostrictive transducer inside, a less contamination sensitive MOOG ServoJet proportional valve with failsafe capability and shut off cartridge valves. In case of a failure the manifold mounted cartridge valves will rapid response the high performance actuator within 100ms to 500ms, depending from the application requirement. The actuator can driven by two undependent safety cycles, a hydraulically as well as a electrically, to fullfill highest standards.

To imprpve the safety requirements and non intended tripping of the system we developed a 2 out of 3 trip logic.

Our inovation

  • Cardan suspensions of the atuactors
    No bending stress act on piston and piston rod and thus they also don`t act on the steam valves.
  • Integrated transducer
    Magnetostriktive transducer with
    1. High resolution
    2. Less drift temperature as LVDT´s
    3. Rugged on boeard electric
    4. Protected against mechanical damages by cylinders integration
  • Robust MOOG ServoJet valves
    The electrical feedback is wear resistant, the integrated electronics allow high resolution and failsafe-function makes an additional electronic safety circuit possible. The robust ServoJet pilot valve has less contamination sensivity, lower pilot oil cunsumtion and higher spool driving force as conventional nozzle flapper and Jet-Pipe valves.

  • Two out of Three trip system
    New developed HP Trip Manifold with "two of three safety logic" prevents at high security and non-intended tripping system.

© Keicher Hydraulik