Low Forward vs Reverse Power Protection Synchronous Generator

[Shark96]

For a steam driven turbo-generator, which protection is better for normal shut down procedure: Reverse power or low forward. The generator manual does specifically say to shut down the unit on low forward. Are there any disadvantages to using low forward tripping during normal shut down?

 

[crshears]

"Sequential tripping" was employed on all eight of the 300 MW steam units in the first generating station I worked in. Its function essentially was to ensure that in situations where the trip request was not from operation of an electrical protection, a closed signal was received from all steam supply valves [plus open signals from the pair of units that had "release valves"] via limit switches before GSU breaker[s - ring bus configuration]] tripping was initiated. An electrical protection operation would trip the GSU breaker immediately, and I don't recall hearing of any situations where there was a catastrophic or even minor overspeed of any of the units under these conditions, ever.

CR

"As iron sharpens iron, so one person sharpens another." [Proverbs 27:17, NIV]

 

[wcaseyharman]

Waross,
I’ve only seen main stop valve limit switches, or a turbine main run relay off, in conjunction with reverse power.

 

[waross]

Thanks.

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Ohm's law
Not just a good idea;
It's the LAW!