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Additional info for ANSI-IEEE 1010-1987 Guide for Control of Hydroelectric Power Plants
For pumped storage installations, the intake gate should also be capable of closing under full reverse ßow conditions. Tripping of the gates is initiated from the power plant by overspeed switches or other devices or by operator action. Control and trip circuits use dc power from the plant battery and stored energy systems, such as gravity or hydraulic accumulators, provide the power to close the gates. Instrumentation and alarms are usually limited to indication of fully open/fully closed position and status of the stored energy system.
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.
Due to the manner by which this starting method works, the generator unit should have a similar ßywheel effect (WK 2) to that of the pump unit. Also, the demands on the generator unitÕs excitation is rather high since it must maintain terminal voltage when the machine is decelerating. An individual case study is mandatory to determine the feasibility of this starting method for a particular application. The one-line diagram for semi-synchronous starting is similar to that for synchronous starting.