GE SR760-P5-G5-S5-HI-A20-R-E Multilin 760 Feeder Management Relay

The SR760-P5-G5-S5-HI-A20-R-E is a high-performance power protection relay launched by GE Multilin. It features robust protection functions, accurately responding to electrical abnormalities such as overcurrent, overvoltage, and ground faults, effectively ensuring the safe and stable operation of power systems. The phase current, zero-sequence current, and sensitive ground current inputs are all 5A, compatible with common current transformers. It has a wide power supply range, accommodating 88-300VDC or 70-265VAC. The device is equipped with eight 4-20mA analog output channels for easy data transmission. It comes with an enhanced display, combined with a red breaker closure LED, making status checking straightforward. Additionally, it supports multiple communication interfaces, facilitating remote monitoring and management, and is widely used in power, industrial automation, and other fields.

Core Functions and Parameters of SR760-P5-G5-S5-HI-A20-R-E

• Phase Overcurrent Protection:
  2 time overcurrent (51P) and 2 instantaneous overcurrent (50P) elements, supporting direction discrimination (67P), compatible with 5A CT.
• Ground Protection:
  Time (51G) and instantaneous (50G) ground overcurrent, plus sensitive ground protection (51SG/50SG), compatible with 5A CT.
• Negative Sequence Protection:
  Negative sequence overcurrent (46) and negative sequence voltage (47) for detecting system unbalanced faults.
• Reclosing Function (760 Exclusive):
  Up to 4 reclose operations, with programmable dead time and current supervision, compatible with instantaneous/time overcurrent elements.

• Control Functions:
  Circuit breaker opening/closing control, manual/automatic switching, and cold load pickup blocking (to prevent inrush current).
• Communication Interfaces:
  Supports RS232/RS485/Ethernet, with protocols including Modbus RTU and DNP 3.0; optional 10Mbps Ethernet port.

• Measured Parameters:
  Current, voltage, power, energy, frequency, harmonics, etc., with accuracy of ±0.25% (voltage) and ±0.5% (current).
• Event Recording:
  256 event records (with timestamps), fault waveform capture (up to 16 records), and fault location function.

• Power Supply:
  HI range (88-300VDC or 70-265VAC), power consumption 25VA (nominal).
• Environmental Adaptability:
  Operating temperature -40°C to +60°C; optional conformal coating (for humid/chemical environments).
  
  

Application Scenarios

Suitable for primary protection of distribution feeders (solidly grounded, high-impedance grounded systems), and backup protection of transformers and buses.

Supports schemes such as distributed generation (DG) grid-connection protection, high-speed detection of arc flash faults, and load shedding (based on voltage/frequency).

The SR760-P5-G5-S5-HI-A20-R-E is a high-performance feeder protection relay that integrates overcurrent, ground, negative sequence protection and autoreclosing functions. It is compatible with 5A CT and high-voltage power supplies, and is suitable for primary and backup protection scenarios in complex distribution networks, with high-precision monitoring and flexible communication capabilities.

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