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489-P5-HI-A20-T is a generator management relay that is manufactured by GE Multilin for the 489 series. This relay has 5 A phase CT secondaries. The HI control power is 90-300 VDC and 70265 VAC at 48-62 Hz. The analog outputs on this relay are 4 to 20 mA. This relay has an enhanced display with a larger LCD and Ethernet. There is 1 non-isolated front panel RS232 port and 2 RS485 ports isolated together at 36 Vpk. The RS485 baud rates are 300, 1200, 2400, 4800, 9600, and 19200. The RS232 baud rate is 9600. The protocol is Modbus RTU / half duplex, DNP 3.0. The dielectric strength is 1.9 kV AC for one second or 1.6 kV AC for one minute, per UL 508.
It is important to test the relay helps to ensure that the CTs and the wiring are complete and correct. The following are the tests that must be completed on the relay: the output current accuracy test, the phase voltage input accuracy test, the ground, neutral, and differential current accuracy test, the neutral voltage (fundamental) accuracy test, the negative sequence current accuracy test, the RTD accuracy test, the digital input and trip coil supervision accuracy test, the analog input and outputs test, the output relay test, the overload curve test, the power measurement test, the reactive power test, the voltage phase reversal test, the GE Multilin (HGF) ground current accuracy test, the neutral voltage (3rd harmonic) accuracy test, the phase differential trip test, and the voltage restrained overcurrent test.
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