The GE Multilin SR750-P1-G1-S1-LO-A20-R-E is a high-performance, microprocessor-based management relay designed for the protection and management of industrial and utility feeder systems. As part of the SR750 family, this specific configuration provides comprehensive protection, monitoring, and control functions including overcurrent, voltage, and frequency elements. The GE Multilin 750-P1-G1-S1-LO-A20-R-E integrates advanced features like high-speed communications and extensive event recording, making it a vital component for ensuring the reliability and safety of electrical distribution networks.
Technical Specifications and Datasheet
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Product ID: 750-P1-G1-S1-LO-A20-R-E
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Brand: GE Multilin
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Series: 750 Feeder Management System
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Power Supply (LO): 24 – 60 V DC; 20 – 48 V AC @ 50/60 Hz
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Phase Current (P1): 1 A Phase CT Secondary
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Ground Current (G1): 1 A Ground CT Secondary
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Sensitive Ground (S1): 1 A Sensitive Ground CT Secondary
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Analog Outputs (A20): 4 to 20 mA Analog Outputs
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Relay Outputs (R): Standard Output Relays
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Environmental (E): Enhanced Conformal Coating
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Dimensions: 222 mm x 214 mm x 172 mm
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Weight: 4.1 kg
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Country of Origin: Canada / USA
Application Fields
This feeder management relay is extensively used in utility substations, large industrial plants, and renewable energy sites. Its primary role is to protect feeders against short circuits, overloads, and ground faults. It is also used for automatic bus transfer schemes, load shedding, and capacitor bank control. Due to the “E” suffix (conformal coating), this specific unit is ideal for harsh environments such as chemical plants, offshore platforms, and mining operations where corrosive gases or high humidity are present.
Product Instructions
The SR750 should be flush-mounted in a cutout on a switchgear panel or relay rack. Ensure that all CT (Current Transformer) and VT (Voltage Transformer) connections are wired with the correct polarity as specified in the 750 series manual. The “LO” power supply input must be fused and connected to a reliable battery system or uninterruptible power source. Configuration is performed via the front-panel keypad or the EnerVista 750/760 Setup software through the RS232, RS485, or Ethernet ports. When commissioning, perform a secondary injection test to verify that the relay accurately measures currents and voltages and that the trip logic operates the intended circuit breaker.
Common Questions and Answers
Q: What is the benefit of the “LO” power supply option? A: The “LO” designation allows the relay to operate on lower voltage control circuits (24-60 VDC), which is common in smaller industrial sites or battery-backed systems where a standard 125/250 VDC station battery is not available.
Q: Can this relay provide synchronized phasor measurements? A: While the SR750 is a highly advanced protection relay, it primarily focuses on protection and control. For dedicated synchrophasor applications (PMU), newer platforms like the UR (Universal Relay) series are typically used.
Q: How do I retrieve the event recorder data after a trip? A: You can view the last several events directly on the vacuum fluorescent display (VFD) on the front panel, or download the full sequence-of-events (SOE) log and oscillography files using the EnerVista software for detailed post-fault analysis.
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