GE UR8AH

The GE UR8AH is a multi-functional protection relay in the General Electric (GE) Multilin UR Series, specifically designed for power systems, industrial power distribution, and critical motor protection. This relay integrates functions such as overcurrent protection, ground fault protection, and voltage protection, making it suitable for the protection and control of medium and low-voltage power grids, transformers, generators, and large motors.

Core Values of UR8AH

• Comprehensive Protection Functions: Supports overcurrent (OC), ground fault (EF), undervoltage/overvoltage (UV/OV) protection, and more.
• High-Precision Measurement: Boasts a current/voltage measurement accuracy of ±0.5%, ensuring reliable fault detection.
• Communication & Automation: Compatible with protocols including IEC 61850, Modbus, and DNP3.0, enabling seamless integration into smart grids.

Product Specifications

• Product Model: UR8AH
• Manufacturer: General Electric (GE)
• Product Type: Digital Protection Relay
• Rated Voltage: 100-240V AC/DC (power input)
• Current Input: 1A or 5A (CT secondary side, configurable)
• Protection Functions: Overcurrent (instantaneous/time-delayed/inverse time-delay), ground fault, voltage protection
• Operation Time: ≤16ms (instantaneous overcurrent)
• Communication Protocols: IEC 61850, Modbus RTU/TCP, DNP3.0
• Input/Output: 8× digital inputs, 6× relay outputs
• Operating Temperature Range: -20°C to +60°C (-4°F to +140°F)
• Protection Class: IP40 (panel mounting)
• Certification Standards: IEC 60255, IEEE C37.90

Structure and Components

• Signal Acquisition Unit: Features high-precision CT/PT interfaces, supporting 1A/5A CT input and a voltage measurement range of 0-300V AC.
• DSP Processing Module: Calculates real-time effective values of current/voltage, harmonics, and phase angles to achieve fault identification.
• Protection Logic Unit: Offers programmable protection curves (e.g., IEC inverse time-delay, ANSI curves), configurable via the Enervista UR software.
• Communication Interface: Equipped with dual Ethernet ports (for IEC 61850) and an RS-485 port (for Modbus RTU).
• Human-Machine Interface (HMI): Includes a 128×64 LCD display for local viewing of parameters, event records, and waveform capture.

Key Features and Advantages

1. High-Reliability Protection

• Harmonic Suppression Algorithm prevents false operations (e.g., interference from inverter harmonics).
• Optional directional overcurrent protection, suitable for looped power supply systems.

2. Flexible Configuration and Expansion

• Customize protection logic via the Enervista UR software, with support for logic programming (FlexLogic™).
• Optional arc protection module (e.g., URAF) for enhanced safety.

3. Intelligent Communication and Diagnostics

• IEC 61850 GOOSE supports fast interlocking tripping (≤8ms).
• Fault recording function (≥128 cycles) to assist in post-event analysis.

4. Industrial-Grade Durability

• Passes IEC 60255 vibration/shock tests (5g @ 100Hz).
• Built-in self-test function for real-time monitoring of hardware health.

Application Fields

• Power Systems: Protection for 10kV-35kV feeders (replacing traditional electromagnetic relays).
• Industrial Power Distribution: Overload protection for large motors (e.g., compressors, pump sets).
• New Energy: Protection for grid-connection points of photovoltaic inverters.

Related Products

• UR6AH: A simplified version with fewer protection functions.
• URAF: An arc protection module for supporting use with UR8AH.
• EnerVista UR: A configuration software available for free download.

Installation and Maintenance

Installation Key Points

• Use shielded wires of ≥2.5mm² for CT secondary wiring to avoid induced voltage interference.
• Lay communication cables (e.g., Ethernet cables) and power cables in separate layers, with a spacing of ≥30cm.

Maintenance Recommendations

• Conduct protection setting verification once a year (using a relay protection tester).
• Regularly back up configuration parameters (via the Enervista UR software).

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Xingruijia

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Consult now to obtain the latest technical information and quotation for GE modules!

·Manager: Jinny                                         ·E-mail: sales1@xrjdcs.com     

·Tel: + 86-15359273791（WhatsApp）   ·Wechat: + 86-15359273791

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