In thermal power plants for controlling
purposes the fluid used is called as the control fluid. This control fluid is situated
in a separate room called the control fluid room which has atleast two pumps out of which only one pump will be
running once and in case of failure the other pump takes care and will be
automatically gets on based on the low pressure or on failure of the other
pump.
The control fluid is used for different
purposes such as ,
- HP secondary fluid
- IP secondary fluid
- Auxillary fluid
- Trip fluid
- start up fluid
- Primary Fluid
Control oil is transmitted to various locations
such as
- Governing Rack
- Control valves like IPCV and HPCV etc...
The control fluid is used in the operation of
the valves and the pressure of the fluid determines by the amount of the valve
opening for which command is provided by the hydraulic governor or electro
hydraulic governor and are defined by characteristics of the hydraulic
governor. The control fluid must be maintained at specific temperature so that
the predefined characteristics are maintained and there will be no ambiguity
during the operation.
For maintaining the temperature of the control
fluid and get the defined characteristics there is a cooler and heater provided
in the control fluid system. If the temperature raises above the set point the
oil is circulated through the cooler and if temperature is very less the control
fluid is heated through the heater available.
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