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Power Plant Instrumentation and Control Handbook by Ajay Kumar Debnath, Swapan Basu

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11. HP–LP Bypass System

11.0. General

There are situations in large power plants in which the TG sets undergo extreme operating conditions like sudden load throw-off, full-load trip-out, or even a planned shutdown for a short span of time. In all such conditions, the TG set is expected to run on house load/low load. In the case of turbine trip/shutdown/open generator circuit breaker, it is set to restart as quickly as possible so that revenue earning continues. For quite a while, the design trend for the TG set has been that the units must be compatible with the systems that enable them to run at house-load operation.
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FIGURE VIII/11.1 HP bypass pressure ...

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