WOODWARD SEG XI1E1 Earth Overcurrent Relay

Description

WOODWARD SEG XI1E1 Earth Overcurrent Relay

Product Overview

The Woodward SEG XI1E1 (part of the SEG / Professional Line series) is an electronic earth-fault protection relay (ANSI 50N/51N). It provides reliable earth-current monitoring, definite-time ground overcurrent protection, and instantaneous earth-fault tripping for electrical distribution networks, generators, transformers, and industrial motors.

Designed for DIN-rail mounting or panel embedding, the XI1E1 features front-panel DIP switches and potentiometers for precise, transparent configuration of current pickup levels and trip delays.

Technical Specifications

Key Advantages

• High Sensitivity: Capable of detecting low-level leakage and ground currents, making it ideal for high-impedance grounded or isolated power systems.
• Two-Stage Protection: Combines a definite-time low-set stage (IE>) for coordinated time-graded protection with a high-set stage (IE>>) for immediate clearing of heavy faults.
• Simple Front-Panel Configuration: Microprocessor-controlled digital accuracy combined with intuitive potentiometer and DIP-switch settings—no PC software required for commissioning.
• Fail-Safe Self-Monitoring: Continuous hardware and internal voltage self-supervision ensures reliable trip signal execution during system line faults.
• Compact Footprint: Saves space inside control cabinets and generator control panels compared to traditional electro-mechanical protection devices.

Important Usage & Installation Precautions

• Current Transformer (CT) Rating Match: Ensure the zero-sequence CT (core-balance CT) secondary rated current matches the relay input rating (typically 1 A or 5 A).
• Auxiliary Power Voltage Check: Verify that the auxiliary supply connected to the A1-A2 terminals strictly matches the relay label rating (e.g., 24 V DC vs 230 V AC) to avoid damaging internal electronics.
• CT Secondary Circuit Safety: Never open-circuit the secondary terminals of a current transformer while the primary conductor is energized. High inductive voltages can cause lethal shocks and destroy equipment.
• Correct CT Wiring Polarity: When using a residual connection (3-CT summation), verify correct CT polarity (k-l) across all phases; incorrect wiring will cause false zero-sequence currents and unwanted trips.
• Regular Testing: Use the front-panel manual TEST button or a secondary injection test set during routine maintenance to verify trip relay contact operation.

Applications

• Generator & Transformer Protection: Detects stator earth faults and winding insulation breakdowns in medium and low-voltage systems.
• Feeder Earth-Fault Protection: Protects outgoing distribution lines in industrial plants and utility substations.
• Motor Protection: Provides sensitive ground-fault tripping for medium-voltage and high-power low-voltage 3-phase motors.
• Marine & Offshore Power Systems: Monitors ground leakage on IT (ungrounded/isolated neutral) marine electrical networks.

Shipping Port: Xiamen, China

Payment: Bank of Chicago, Bank of Singapore

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