Controls for Emergency Power, Peak Shaving, Utility Paralleling, and Prime Power/Cogeneration

Russelectric custom designs and builds low- and medium-voltage power control systems to meet the stringent performance and reliability requirements of data centers, hospitals, airports, communications, energy, defense, and other mission critical facilities.

In addition to controlling emergency power, systems can be designed for a variety of sophisticated control schemes such as peak shaving, load curtailment, and utility paralleling using live-source closed- transition retransfer and system test to avoid disturbing the load. Prime power and cogeneration systems are also available. Systems include sensors to monitor volts, amps, watts, frequency, and other electrical power data as well as controls for automatic prime mover starting/ stopping, status, and alarm annunciation; synchronizing; and priority load control. Load demand for fuel management and other controls are available as options.

Controls can be furnished for any major manufacturer’s engine generator sets.

Emergency Generator Control Systems

• Upon receipt of loss of normal power source signal from automatic transfer equipment, system automatically sends command to start engine generators.

• The first generator set to reach pre-set voltage and frequency is connected to the bus by closing its circuit breaker.

• System permits first priority loads to transfer to the connected engine generator set, while delaying the transfer of lower priority loads until additional generator capacity has been connected.

• System manages random paralleling of remaining generator sets to the emergency bus through their individual synchronizers and circuit breakers.

• System signals lower priority loads to transfer to the emergency power system as generator sets are added to the bus.

• System manages the shedding of low priority loads if a generator set fails during emergency operation, thereby assuring continuous power to the high priority loads.

• Upon receipt of signal from transfer equipment that it has retransferred to the normal source, system alerts generator sets to disconnect and shut down.

• Alarm and failure system, including annunciation, automatically shuts down an engine generator if required.

• Redundant PLCs ensure uninterrupted automatic system control — even if one fails.

• System design allows manual start and synchronization of generator sets if automatic controls malfunction.

• LCD HMI touchscreen displays, system one-line, alarms, setpoints, etc.

• Optional load demand sensing determines the number of engine generators in operation based on the actual load.

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