Relays upgrade at no charge

Synchrophasor measurements now available in SEL-351 distribution relays.

Schweitzer Engineering Laboratories, (SEL) is announcing that the SEL-351 family of distribution relays now includes synchrophasor measurement technology, built in at no charge.

Further, more than 100,000 existing SEL-351 Relays can be upgraded without changing hardware for only $250 each.

"Until recently, synchronized phasor measurements were available only from laboratory equipment or from expensive, stand-alone phasor measurement units," said SEL Founder and President Edmund O.

Schweitzer.

"The expense and need for separate equipment have limited the practical use of synchrophasors in utility operations, a problem solved by SEL technology." With synchrophasor measurements in SEL-351 Relays, utilities can quickly and easily: * Measure the state of the power system rather than estimating it.

* Test instrument transformers within substations to verify that line and bus voltage transformers agree in magnitude and phase.

* Check current transformer polarities, phasing, and ratio.

* Analyze faults more thoroughly.

* Improve stability using measured angles between the transmission system and distribution buses.

* Display event records collected by synchronized SEL relays in perfect time-alignment.

The synchrophasor capability in SEL-351 Relays is also compatible with SEL synchroWAVe Software and the SEL-3306 Synchrophasor Processor.

SEL-5077 synchroWAVe Server Software and the SEL-3306 time-correlate synchrophasor data from SEL-351 Relays and send the information to display and archiving systems, such as SEL-5078 synchroWAVe Console Software.

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