750-P5-G1-S1-HI-A20-R | GE Multilin 750 Feeder Protection System

The GE Multilin 750 Feeder Protection System is a digital relay designed for the primary protection and control of distribution feeders, as well as providing backup protection for bus, transformers, and transmission lines. It boasts a draw-out construction, making it easy to use and cost-effective throughout its product life cycle.

Key Benefits

• User-Friendly: Supported by industry-leading software tools.
• Accurate Metering: Built-in metering functions eliminate the need for auxiliary metering devices, reducing costs.
• Uptime Improvement: I/O monitoring improves the uptime of auxiliary equipment.
• Maintenance Cost Reduction: Features like IRIG-B time synchronization, event reports, waveform capture, and data logger reduce troubleshooting time and maintenance costs.
• Quick Replacement: Draw-out construction minimizes replacement time.
• Simplified Testing: Built-in simulation features.
• Cost-Effective Information Access: Supports industry protocols such as DNP & Modbus and includes an optional 10MB Ethernet port for system integration.
• Comprehensive Monitoring: Analog I/O and full metering, including demand and energy.
• Advanced Technology: Flash memory for field upgrades.
• Extended Life: Optional conformal coating for chemically corrosive and humid environments.
• Global Acceptance: Adheres to international codes and standards.

Technical Specifications

Protection Functions

• Phase/Neutral/Ground/Negative Sequence Time Overcurrent Protection: Pickup level of 0.05 to 20.00 in steps of 0.01 x CT, dropout level of 97 to 98% of pickup.
• Sensitive Ground Time Overcurrent Protection: Pickup level of 0.005 to 1.000 in steps of 0.001 x CT, dropout level of 97 to 98% of pickup.
• Phase/Neutral/Ground/Negative Sequence Instantaneous Overcurrent Protection: Pickup level of 0.05 to 20.00 in steps of 0.01 x CT, dropout level of 97 to 98% of pickup.
• Phase Directional Protection: MTA of 0 to 359° in steps of 1, angle accuracy of ±2°.
• Neutral Directional Protection: Polarized by voltage, current, or both, with angle accuracy of ±2°.
• Ground/Sensitive Ground Directional Protection: Polarized by voltage, current, or both, with angle accuracy of ±2°.
• Bus Undervoltage and Line Undervoltage Protection: Pickup level of 0.00 to 1.25 in steps of 0.01 x VT.
• Overvoltage Protection: Pickup level of 0.00 to 1.25 in steps of 0.01 x VT.
• Negative Sequence Voltage Protection: Pickup level of 0.00 to 1.25 in steps of 0.01 x VT.
• Underfrequency Protection: Pickup level of 20.00 to 65.00 Hz in steps of 0.01 Hz.
• Neutral Displacement Protection: Pickup level of 0.00 to 1.25 × VT in steps of 0.01.
• Reverse Power Protection: Pickup level of 0.015 to 0.600 × rated power.
• Breaker Failure Protection: Pickup level of 0.05 to 20.0 x CT in steps of 0.01.

Metering Functions

• Current Phasors: Phase A/B/C RMS current with ±0.5% accuracy of full scale.
• Voltage Phasors: Phase A-N (A-B), B-N (B-C), C-N (C-A) voltage with ±0.25% accuracy of full scale.
• Frequency Measurement: 16 to 65 Hz range with ±0.02 Hz accuracy.
• Symmetrical Components: Current and voltage level accuracy of ±1.5% and ±0.75% of full scale, respectively.
• Power Factor: Range of 0.00 Lag to 1.00 to 0.00 Lead with ±0.02 accuracy.
• Real Power: Range of -3000.0 to 3000.0 MW with ±1% accuracy.
• Reactive Power: Range of -3000.0 to 3000.0 Mvar with ±1% accuracy.
• Apparent Power: Range of -3000.0 to 3000.0 MVA with ±1% accuracy.
• Watt-Hours and Var-Hours: Range of -2.1 × 10^8 to 2.1 × 10^8 with ±2% accuracy.

Monitoring Functions

• Phase/Neutral Current: Pickup level of 0.05 to 20.00 × CT with ±100 ms timing accuracy.
• Power Factor: Pickup level of 0.50 lag to 0.50 lead with ±0.02 accuracy.
• Analog In Threshold and Rate: Pickup level from 0 to 65535 units and rate of -1000 to 1000 mA/hour with ±1% accuracy.
• Overfrequency: Pickup level of 20.01 to 65.00 Hz with ±0.02 Hz accuracy.

Event and Data Logging

• Event Recorder: Records up to 256 events with 1 ms time stamp.
• Waveform Capture: 4 currents, 3 voltages, 14 logic input states, and 8 output relays.
• Data Logger: 8 channels with various sample rates and trigger sources.

Inputs and Outputs

• Phase Current Input: 1 A or 5 A specified when ordering.
• Ground Current Input: 1 A or 5 A specified when ordering.
• Sensitive Ground Current Input: 1 A or 5 A specified when ordering.
• Voltage Input: 50 V to 240 V phase-neutral with less than 0.025 VA burden at 120 V.
• Logic Inputs: 14 contact and/or virtual, 6 virtual only.
• Analog Input: 0 – 1 mA, 0 – 5 mA, 0 – 10 mA, 0 – 20 mA, or 4 – 20 mA (programmable).
• Analog Outputs: 8 channels, specify output range when ordering.

Environmental and Approvals

• Operating Temperature: -40° C to +60° C.
• Storage Temperature: -40° C to +85° C.
• Humidity: Up to 95% (non-condensing) at 55°C.
• Pollution Degree: 2.
• IP Rating: IP40 (front), IP20 (back).

Communications

• Serial Ports: 300 – 19,200 baud, ModBus® RTU or DNP 3.0 protocol.
• Ethernet Port: 10BaseT, RJ45 Connector, ModBus® RTU over TCP/IP.

Power Supply

• Options: LO/HI specified when ordering.
• LO Range: DC = 20 to 60 V, AC = 20 to 48 V @ 48 – 62 Hz.
• HI Range: DC = 88 to 300 V, AC = 70 to 265 V @ 48 – 62 Hz.
• Power: 25 VA nominal, 35 VA maximum.
• Voltage Loss Hold-Up Time: 30 ms.

Tests and Approvals

• cULus: UL508, UL1058, C22.2.No 14.
• Type Tests: Include various standards like EN60255-5, EN50263, IEC 61000-4-18, and many more for dielectric strength, RF immunity, and environmental tests.

Ordering Information

• Example: 750-P5-G1-S1-HI-A20-R
  • Phase Current Inputs: P5 - 5 A phase current inputs
  • Ground Current Inputs: G1 - 1 A zero sequence current inputs
  • Sensitive Ground Current Inputs: S1 - 1 A sensitive ground current input
  • Power Supply Options: HI - 88 – 300 VDC, 70 – 265 VAC @ 48 – 62 Hz
  • Analog Outputs: A20 - Eight 4 – 20 mA analog outputs
  • Breaker Status LED: R - Red breaker status LED

The GE Multilin 750 Feeder Protection System offers a comprehensive suite of protection, metering, and monitoring functions, supported by robust technical specifications and industry standards, ensuring reliable and efficient operation in various environments.