Symmetricom’s GPS Time Source synchronizes substations for Southwest Transmission Power

San Jose, CA, Dec. 7, 2005 — Symmetricom Inc., a provider of precise time and frequency products and services, announced that Southwest Transmission Electric Power Co-op Inc., the Arizona-based electric power co-op that operates and maintains a power delivery system that includes 580 miles of transmission lines and 20 substations, implemented Symmetricom’s XL-750 GPS Time Source. The XL-750, a GPS timing instrument for power industry substation and utility companies, synchronizes protection relays and other intelligent electronic devices (IEDs) that collect and time stamp fault data.

The XL-750 was developed by Symmetricom specifically for the power industry. Using GPS satellites, the XL-750 generates accurate output pulses and time codes in multiple formats and offers superb timing accuracy (100 nanoseconds to UTC). The XL-750 synchronizes a wide variety of microprocessor-based power system equipment including SCADA systems, remote terminal units (RTUs), protection relays, sequence of event recorders, digital fault recorders, power/tariff meters and other intelligent electronic devices (IEDs).

Southwest Transmission expects the XL-750 to provide future benefits in relation to regulatory requirements such as support of synchrophasors derived from GPS synchronized measurements of voltage and current relationships throughout the power grid. With the XL-750 at each substation, the company expects they will be prepared for any mandatory compliance requirements.

The XL-750 also meets the recommendations of the North American Electric Reliability Council (NERC) for event timing, such as Recommendation No. 12 concerning GPS time-synchronized recording devices.

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