TripCon electrohydraulic trip block for releasing trip valves on steam turbines, gas turbines and process safety valves (photo: Voith)

Avoiding overspeed is a fundamental requirement in gas and steam turbine safety management. The TripCon trip block enables continuous triple modular redundancy, from the speed sensor to the hydraulic cylinder of the trip valve. It has a modular and compact design which allows for the economical implementation of all standard safety concepts for turbine control systems. The Mean Time Between Failures is over 100,000 years. Reliability of the turbine and the productivity of the entire system is thereby increased.

The TripCon has a wide pressure range from 6 to 180 bar, which makes it suitable for high-pressure and low-pressure hydraulic systems. Large discharge volumes of up to 320 l/min with a differential pressure of 6 bar enables fast shutdown times – usually less than 300 ms. The TripCon is available in various types. All variants of the trip block have a triple-redundant design with an integrated 1oo1 partial stroke test enables a simple check of the function of the trip valve, even during operation. The partial stroke test is available with optional 2oo2 redundancy. An expansion module is available, which allows for the replacement of all solenoid valves during operation.

The trip block is certified with Safety Integrity Level 3 (SIL 3 compatible) as per IEC 61508, this is in response to the requests from many Voith customers who design products and systems according to this standard. Engineers have paid particular attention to the magnetic forces of the valves and these have been especially developed to provide a high magnitude. This makes the TripCon highly resistant to dirt and other contamination in the operating medium – turbine lubrication oil is sufficient in most cases.

Typical applications for the TripCon are trip valves on gas and steam turbines in high-availability plants. Furthermore, the trip block is suitable for retrofitting non-redundant trip systems. Additional applications are conceivable, for example, for water turbines or generally for safety valves in process engineering.

Furthermore, the trip block is suitable for retrofitting non-redundant trip systems. Additional applications are conceivable, for example, for water turbines or generally for safety valves in process engineering.

Tags: Voith