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GE 7556D26G2
Product Name: GE Multilin 7556D Voltage & Reactive Power Control Relay
Product Introduction: A voltage and reactive power integrated control relay designed for substation automation, performing automatic voltage regulation (AVR) and reactive power compensation management in power transmission and distribution networks.
Detailed content
Technical Specifications:
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Rated Voltage: 110 V / 220 V DC or 110 V / 220 V AC (selectable)
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Control Outputs: 9 channels (configurable up to 12)
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Communication Protocols: Modbus RTU / DNP3.0
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Communication Interface: RS-485, max. transmission distance 1200 m
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Operating Temperature: –25 °C to +70 °C
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Storage Temperature: –40 °C to +85 °C
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Mounting: DIN rail / panel flush mount
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Dimensions (W×H×D): Approx. 146 mm × 114 mm × 96 mm
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Weight: Approx. 0.85 kg
Functional Features: Automatic/manual dual-mode switching; built-in four-quadrant reactive power control logic; combined control of capacitor bank switching and On-Load Tap Changer (OLTC) transformers; event recording and Sequence of Events (SOE); PT open-circuit and CT open-circuit detection protection.
Application Scenarios: Power transmission and distribution, substation automation, industrial reactive power compensation, renewable energy grid integration.
Installation Requirements: Confirm supply voltage matches relay rated voltage. Follow terminal diagrams strictly for PT and CT wiring. Use shielded twisted-pair cable for communication wiring with shield grounded at a single point.
Usage Notes: Verify PT/CT ratios during commissioning. Ensure proper earthing of the relay chassis.
