This invention relates to a turbine speed control and overspeed protection, which are very critical for safe and reliable operation of the turboset. Hydro-mechanical overspeed emergency governors have been replaced with electronic overspeed protection system. This is realized using six probes connected in 2 out of 3 channels. The system is of failsafe de-energised to trip design. For achieving faster response, hardwired speed monitroring modules are used based on relay based protection circuits. The system can be tested online simulating an overspeed signal using a test frequency generator. This obviates the need for actual overspeed test on the machine. Speed signals are also used for turbine governing system.
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