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Poppy   Steam Forum  

Reverse power

Sunday, April 23, 2017   By: John [1794] 2 Stars
Can someone tell me if there are interlocks for reverse power

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Monday, April 24, 2017   By: Murphy [21] 4 Stars
Can t imagine a reverse power relay not being consider an interlock. It meets the definition of being integral with terminal generator main breaker to open on a reverse power condition and trip the turbine generator.

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Thursday, April 27, 2017   By: Jim Watts [764] 5 Stars
The reverse power relay just trips the generator Circuit breaker.
It is interlocked so that if the turbine is not tripped it will exercise a time delay before tripping. If the turbine is tripped the CB will open as soon as reverse power is detected.
Shutdown procedures often trip the turbine and allow reverse power to open the CB. This ensures the turbine valves are capable of closing to prevent overspeed. If the generator trip does not follow the turbine trip, the turbine steam isolating valves must be closed before the generator CB is opened.

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Thursday, August 10, 2017   By: Salman Rafique [2169] 0 Stars
What would happen if reverse power detected but generator CB will not trip or open. What are the possible damages if this condition occurs.

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Wednesday, August 16, 2017   By: Murphy [21] 4 Stars
Simply, the steam turbine will be damaged for it will be spinning at high speeds without steam because there will be no steam demand so the throttle will be closed. I dont think the turbine can be run for very long without steam because it will overheat as stated earlier by Watts. That circuit breaker on the AC generator has to open for I would fear speed regulation to be an unacceptable condition too. The likely damaging scenarios are just not pretty. What a good question...

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Featured
VWO, BMCR, TMCR, Full Load and Base Load
By: Jim Watts [764]

MCR is maximum continuous rating.

BMCR is the Boiler MCR, TMCR is the turbine MCR

VWO is valves wide open and at normal pressure allows the turbine to exceed TMCR by 5-10 percent

Full load is not fixed but means the turbine has reached it intended maximum

Base Load is also a flexible number and means the turbine will not be operated below that figure. It is mostly used in power system scheduling where the cheapest plants run fully loaded and are referred to as base load plants. O....   Read All
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