Get ANSI-IEEE 1010-1987 Guide for Control of Hydroelectric Power PDF

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Extra resources for ANSI-IEEE 1010-1987 Guide for Control of Hydroelectric Power Plants

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Some installations may input reference analog or digital signal rather than raise/ lower commands. 65GLR, 65GLL Gate limit raise/lower commands C H-9 Typically relay contact closures, routed to reversing drive motor. Primary function of the gate limit (GL) is to limit the maximum opening of the wicket gates under operator control to prevent overloading the unit at the prevailing head. Other control and protection applications include: ¾Pre-positioning GL to 0% prior to starting to permit controlled opening of the gates upon energization of the start/stop solenoid 65SS ¾Raising GL to turbine breakaway gate position after energization of 65SS ¾Generate-synchronous condenser transfer schemes ¾Rapid unloading of the machine during certain stop and protection shutdown sequences 65AL Actuator lock on-off C H-10 Permits the actuator lock to be applied or to be reset by an operator at a location remote from the governor.

Once the unit is paralleled, the station service supply to the pony motor is tripped. Typical acceleration time is from Þve to ten minutes. Pony motor starting is suitable for use with large motor/generator units. Pony motor size could range up to several thousand horsepower, depending upon the requirements of the unit being started. A one-line diagram for this starting method is shown in Fig 3K-3. The pony motor and liquid rheostat have interfaces to both the unit protection and the control system on the unit control switchboard.

Pump Starting Equipment A pumped-storage unit is a turbine/generator that can be reversed to pump water upstream. When operating as a pump, the generator becomes a motor, which now supplies mechanical power to the turbine. Starting the unit in the pump mode requires a means of accelerating the generator / motor in the pump direction. Regardless of how this is done, the motor is started with the gates closed and the tailwater depressed. Once the unit is at full speed and on-line, the depressing air is vented and the pump is primed.

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ANSI-IEEE 1010-1987 Guide for Control of Hydroelectric Power Plants

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