An advanced electric meter, the SEL 734, exceeds ANSI and IEC Class 0.2 accuracy with four-quadrant energy and demand metering. Advanced load profile trending is compatible with MV-90(R), DNP3, and Modbus protocols to ensure integration with most any billing system. In addition to a full set of revenue-metering features, advanced power quality monitoring will report costly system disturbances. The meter exceeds ANSI C12.20 0.2 class accuracy at unity power factors with bidirectional, full four-quadrant energy metering for generation, interchange, transmission, distribution, or industrial applications. A few features include:
- Load profile data collection records billing data with a simple-to-use load profile recorder capable of holding years of data.
- Synchronized phasor measurement combines the SEL-734 with an SEL IRIG-B time source to measure the system angle in real time with a timing accuracy of ±10 µs. This allows measuring instantaneous voltage and current angles in real time to improve system operation with synchrophasor information.
- Transformer and line-loss compensation lets techs enter transformer nameplate and line impedance information directly into the meter to compensate for transformer or line losses and move the billing point.
- Time-of-use metering provides flexible, time-differentiated energy and demand registers with multiple day types, rates, seasons, and a 20-year programmable calendar.
- Predictive demand monitors accumulated demand and alarms when the demand exceeds a user-defined limit. The SEL-734 can then shut down loads or peak-shave with generation to avoid demand charges. A predictive-demand alarm is available through Modbus, DNP3, Mirrored Bits communications, or the front-panel LEDs.
Schweitzer Engineering Laboratories
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