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CommentsThe protection of a turbine requires a device which ensures the turbine does not automatically restart once a protective trip resets. EG if an overspeed trip occurs you do not want the turbine to resume operation as soon as it slows down below trip speed as it could cycle into overspeed again and continue repeating the cycle.

The trip logic therefore includes a lockout which must be manually reset before the turbine valves can be opened again.

All sorts of devices are used but most commonly a hydraulic valve which isolates oil from the stop valves. It is separate from the trip solonoid but may be part of the overspeed trip hydraulics

It was common for the hydraulic valve to have a mechanism referred to as a latch because once it opened it stayed open until the oil pressure was lost again. In electrical terms it is a seal in relay

Resetting this device is called latching the turbine

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Arnulfo Macejkovic

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Q: What is meant by latch?
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