Digital guide
You are here:
GE 7556D18G1
Product Name: GE Multilin 7556D Series Multifunction Feeder/Motor/Generator Relay
Introduction: A microprocessor relay providing integrated protection, metering, recording, and IEC 61850 communication for medium-voltage assets.
Technical Specifications:
-
Current Inputs: 1 A / 5 A selectable, ±0.5 % measuring
Detailed content
-
Aux Supply: 110/120 V AC or DC
-
Protection: 50, 51, 50N/51N, 87, 21, 27/59, 81, 79
-
Recording: 64-cycle waveform capture, 256 event logs
-
Comms: RS-485, Ethernet, Modbus RTU/TCP, DNP3, IEC 61850
-
Outputs: 4 power relays + 2 logic
-
Panel: 96 × 96 mm, IP54 front / IP20 body
-
Temperature: −20 °C to +55 °C
Functional Features: Auto-reclose, directional OC, thermal image modeling, phasor display.
Working Principle: CT/VT analog front-end → anti-alias filter → simultaneous sampling ADC → protection DSP → trip decision.
Materials: PC/ABS housing, spring-clamp terminals, glass LCD.
Installation: Flush-mount in 92 × 92 mm panel cutout, depth ≥ 100 mm; CT secondary never open, VT secondary never short.
Precautions: Setting changes only by protection engineer; perform relay test before energization; verify firmware checksum.
