Switchgear Bolsters Transfer-Switch Producer

Officials at a Chicago-based manufacturer of automatic transfer switches decided to put their money where their mouth is and install their own paralleling switchgear in their backup power system. The system, which controls the operation of two engine-generators—a 225-kW unit and a 175-kW unit—provides the backup power for the entire plant. Upon loss of incoming utility power, the system automatically starts the two engine-generators, synchronizes the output and then feeds the plant loads through automatic transfer switches. The system is also used as part of the local electric utility's interruptible-rate program, which helps the utility manage its peak loads when energy requirements are at a premium.

In addition to alarming, reporting and trend-analysis capabilities, the control system provides wireless access from a personal data assistant and remote monitoring via Internet or corporate intranet. Other key features include:

• Engine-generator start, stop, crank and cool-down control.
• Engine-generator emergency operation during a utility power failure.
• Power monitoring and protection.
• Web-enabled graphical user interface for eased configuration.
• Multiple section switchgear with insulated-case circuit breakers.
• Eight logical relay functions and 12 user-programmable relays.
• Alarm/event logging for trend analysis and management reporting.
• Interface with electronic as well as generic hardwired engine generators.

The new system replaces a 20-year old paralleling switchgear, and management expects a payback through operational efficiencies and energy savings.

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