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GE SR750 Feeder Management Relay
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- Part Number: SR750
- Brand: General Electric
- Type: Feeder Management Relay
- Dimensions: 22.8x15.1x3.5cm
- Country of Origin: USA
- Barcode: 8537101190
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Additional Specifications
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Product Description
The GE Fanuc SR750, operates as a dedicated hardware component for the digital protection, control, algorithmic metering, and automated monitoring of electrical distribution feeders within GE Multilin 750/760 series power setups.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | SR750 |
| Brand | GE Fanuc / Multilin |
| Origin | Canada |
| Weight | 8.50 lbs (3.85 kg) nominal |
| Dimensions | 222 mm x 216 mm x 302 mm |
| Operating Temp | -40 to +60 deg C |
| Power Input (Low Range Configuration) | 20-60 VDC; 20-48 VAC at 48-62 Hz |
| Power Input (High Range Configuration) | 88-300 VDC; 70-265 VAC at 48-62 Hz |
| Phase Current Current Transformer (CT) Inputs | 1 A or 5 A secondary scaling options |
| Ground Current CT Inputs | 1 A or 5 A secondary scaling options |
| Sensitive Ground CT Inputs | 1 A or 5 A secondary scaling options |
| Analog Output Signal Options | 0-1 mA, 0-5 mA, 0-10 mA, or 4-20 mA DC loops |
| Breaker Status HMI Indication | Configurable Red or Green "Breaker Closed" LED |
| Core Protection Profiles | Overcurrent, ground fault, directional overcurrent, voltage, frequency, auto-reclosing |
| Core Control Interfaces | Manual or automated circuit breaker trip/close coils; local/remote logic shifting |
| Core Metering Capabilities | True RMS current, voltage, real/reactive power, total energy, power factor |
Industrial Control and Networks
- Backplane Bus Communication Velocity: The relay logic controller executes internal sampling and protection algorithms within deterministic clock periods. This high-speed backplane execution ensures that fault detection parameters sub-sequence to trip output relays within milliseconds of an overcurrent event, preserving grid stability.
- I/O Density Scaling: The module integrates three-phase current transformer inputs, zero-sequence ground inputs, auxiliary potential transformer voltage inputs, and programmable digital contacts into a single high-density chassis footprint. This arrangement collapses multiple discrete protection disks into one panel cut-out, dropping wireway density.
- Firmware Flash Compatibility: Core tripping curves, network configuration parameters, and Modbus memory maps reside in non-volatile flash memory sectors. The internal firmware revision must align with the active EnerVista or setup software baseline to prevent parameter upload blocks or synchronization failures during settings file transmission.
Frequently Asked Questions
Q: How does the SR750 manage control switching logic during a local/remote state transition?
A: The relay incorporates a dedicated hardware-interlocked command state machine. When the local/remote state is set to local, the firmware drops software-initiated trip/close commands from the Ethernet or serial SCADA network, preventing accidental remote operations while field technicians are actively servicing the breaker cubicle.
Q: What are the engineering consequences to the active protection curves if the auxiliary power supply encounters a line sag below minimum thresholds?
A: The internal power supply board relies on internal capacitive storage banks to ride through brief voltage sags. If the supply voltage drops below the absolute minimum operational baseline (e.g., below 20 VDC on low-range units), the hardware watchdog relay immediately drops out, forcing a safe-state alert contact to close and disabling the trip outputs to prevent erratic, unmanaged relay behaviors.
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