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As a minimum, each unit and the general station should be separately alarmed. Never include Þre detection on general trouble alarm circuits. Emergency power is needed to operate Þre protection equipment and associated controls and alarms. Dedicated circuits from the station battery or other highly reliable power source should be used for control and alarm. Diesel or gas turbine generators can provide backup power for Þre water pumps and battery chargers. 4. Control SequencingÑGenerating Units The unit control system provides operating mode selection and a means of starting and stopping a hydroelectric generator.

Usually, the simplest and most cost-effective method, especially for large units, is to use a motor operated switch. It can be either a four-pole or Þve-pole design, depending on whether or not it is desired to open the third phase when the switch is operated. A typical connection of a Þve-pole switch is shown in Fig 3L-1. Breakers can be used for phase reversal in two ways. First, two-unit breakers can be provided with the phases interchanged in the external buswork. This connection is shown in Fig 3L-2.

Alarm devices are mounted on the distribution panel, where all alarm conditions are combined into one for transmittal to the central control room. Instrumentation will include dc volts and amperes for each battery charger and battery bank, and incoming ac volts and amperes. Protection and alarms may consist of ac and dc undervoltage, overcurrent, and battery ground. DC undervoltage is normally interlocked with the unit start circuits to prevent starting the unit without proper control power. 3R.

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

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