Description
The GE SR750 (Multilin 750) is an advanced feeder management relay complete with a protective drawout case, engineered by General Electric to provide comprehensive protection, control, metering, and data recording for distribution feeders in industrial and utility power systems.
📋 Technical Specifications Datasheet
- Brand: GE (General Electric Multilin)
- Model: 750-P1-G1-S1-HI-A20-R-E-H (SR750)
- Series: Multilin 750/760 Feeder Protection System
- Product Name: Feeder Management Relay with Case
- Manufacturing Origin: United States
- Product Status: Industrial Protection Standard
- Dimensions: Standard 19-inch rack-compatible drawout case enclosure
- Weight: Approximately 6.5 kg (with case)
- Original Equipment Manufacturer: GE Multilin
- Power Supply Rating: High-range control power (HI: 90-300V DC / 70-265V AC)
⚙️ Operating Norms and Usage
- Ensure standard electrostatic discharge (ESD) precautions are taken when working near open relay terminals or internal circuitry.
- Mount the relay case securely into a vertical switchgear cutout panel, ensuring proper grounding via the rear chassis terminal.
- Verify all CT (Current Transformer), VT (Voltage Transformer), and control power wiring against the specific model configuration diagram before inserting the relay into the case.
⚡ Power-On / Power-Off Sequence
- Power-On Sequence: Confirm all external current transformer shorting blocks are removed and normal, energize the auxiliary control power supply feed, and verify that the relay front-panel display powers up to the normal monitoring screen without error messages.
- Power-Off Sequence: Isolate and disable downstream trip outputs if necessary, disconnect the primary auxiliary control power supply, and engage CT shorting links before extracting the relay module from its drawout case.
📖 Product Usage Instructions
- Monitor real-time system parameters, phasor diagrams, and event logs directly from the front-panel alphanumeric display and navigation keypad.
- Utilize GE EnerVista 750/760 Setup software via the front USB/serial port or rear communication interface to configure protection settings, logic elements, and retrieve oscillography records.
- Routinely test trip outputs, digital inputs, and analog metering accuracy as part of scheduled facility maintenance programs.
❓ Common Questions & Answers Q&A
- Q: What does a “Self-Test Error” message on the front display mean?
A: It indicates an internal hardware or firmware anomaly detected by the relay’s continuous diagnostic routine; check event records via EnerVista software.
- Q: Can the relay be removed from its case while the system is energized?
A: The drawout design allows module extraction, but CT circuits must be externally shorted first to prevent dangerous open-circuit high voltages.
Recommended Alternative Series & Models
- GE Multilin Relay: SR760-P1-G1-S1-HI-A20-R-E-H
- GE Multilin Relay: SR350-P1-HI-A20
- GE Multilin Relay: SR745-P1-HI-A20
- GE Multilin Relay: SR489-P1-HI-A20
- GE Multilin Relay: SR750-P2-G1-S1-HI-A20-R-E-H
- GE Multilin Relay: F60 Feeder Protection System
- GE Mark VIe Module: IS420UCSCH1A
- GE Drive Board: 531X301DCCAFG2
- GE Terminal Board: 531X305NTBAPG1
- GE Voltage Board: DS200NATOG1A
