This testing method more accurately mimics realistic conditions on a power system however, steady-state, single-phase testing may be preferred because it is simpler and can be done manually. This is an automated test involving application of a pre-fault state followed by a fault state. An alternative testing method uses state simulation. In addition, single-phase testing simplifies the test and is suitable for all test sets, including test sets that do not have the six current channels necessary to drive a three-phase test. Although this does not simulate actual conditions on a system, it does provide adequate proof that the relay has been set as desired. INTRODUCTION One way to test a differential element is to use a steady-state, single-phase current injection method. SEL offers unmatched local technical support, a worldwide, ten-year product warranty, and a commitment to making electric power safer, more reliable, and more economical.įor more news and products from SEL, please click here.Single-Phase Testing of the SEL-487B Differential Element Without State Simulation Chris Burger For more information on features, benefits, and applications, visit SEL serves the electric power industry worldwide through the design, manufacture, supply, and support of products and services for electric power system protection, monitoring, control, automation, data encryption, and metering. SEL is now accepting orders for the SEL-487E, offering wide-area control at no additional cost to the $6,750 base price. Trip or start generators based on system load angles.Ĭontrol tap position based on combined values.Īpply SELogic® control equations to time-correlated remote measurements.ĭetect system separation to initiate islanding control. This advanced SEL-487E Relay communications technology allows customers to: “Large generators and transmission stations that frequently use this type of relay can now easily apply remote measurements to control tap changers, regulate generator voltage, and notify operators of system conditions.” “A multirestraint transformer differential relay, such as the SEL-487E, is an ideal platform for synchrophasor-based control,” says Roy Moxley, SEL marketing manager for synchrophasors. Remote angles, currents, and voltages received in the serial synchrophasor message can be combined with local measurements for basic or advanced applications. This enhancement to the SEL-487E Transformer Protection Relay allows it to receive IEEE C37.118 synchrophasor messages from up to two phasor measurement units, time-correlate the information, and take control actions based on local and remote messages. (SEL) today announced wide-area-measurement-based control in a transformer relay for the first time. Schweitzer Engineering Laboratories, Inc.
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