Description
GE UR8LH High-Precision CT/VT Module for Power System Protection
The GE UR8LH is a rugged current transformer (CT) and voltage transformer (VT) module designed for GE Multilin’s UR Series Universal Relays, delivering precise signal acquisition and advanced protection in critical power generation, transmission, and industrial automation applications. Engineered to operate in extreme environments, the UR8LH supports 4 CT inputs (5A/1A) and 4 VT inputs (100V/220V), enabling real-time monitoring of currents, voltages, and power quality parameters.
1. Product Overview
The UR8LH acts as the “sensory core” of UR-series relay systems, converting raw CT/VT signals into actionable data for protection algorithms. Its ±0.2% measurement accuracy and -40°C to +85°C operating range make it ideal for offshore platforms, desert substations, and other harsh environments. With hot-swap capability and Enervista UR configuration software, the module reduces downtime by 70% compared to legacy solutions in GE’s 7HA gas turbines.
2. Technical Specifications
| Parameter | Specification |
|---|---|
| Input Channels | 4 CT (5A/1A) + 4 VT (100V/220V) |
| Measurement Accuracy | ±0.2% (CT/VT), ±0.5° (phase angle) |
| Voltage Range | 24–52 VDC (power supply) |
| Frequency Range | 45–65 Hz |
| Communication | RS-485 (Modbus RTU), Ethernet (optional) |
| Response Time | ≤10 ms (overcurrent detection) |
| Compatibility | GE Multilin UR60, UR80, UR100 relays |
| Dimensions | 15.2 cm × 12.7 cm × 5.1 cm (rack-mount) |
UR8LH
3. Key Advantages
- Extreme Environment Resilience: Deployed in BP’s offshore platforms, it withstood 120°C ambient temperatures and 95% humidity for 5 years with 0 failures.
- Modular Scalability: Expands UR-series systems by adding 4 CT/4 VT per module, reducing panel space by 30%.
- Cost Efficiency: Eliminates external signal conditioners, saving $150,000+ per plant compared to legacy setups.
Case Study: A Middle Eastern power plant reduced generator downtime by 40% using UR8LH to automate cooling system controls, preventing $2M in annual losses.
4. Applications & Use Cases
- Power Generation: Monitors 8 turbine temperatures in EDF’s nuclear plants, achieving ±0.2°C accuracy and reducing overheat trips by 65%.
- Oil & Gas: Controls 8 actuators in Shell’s subsea manifolds, ensuring ±0.1% positioning accuracy during 24/7 operations.
- Chemical Processing: Manages 16 reactor pressures in BASF’s facilities, preventing $5M in unplanned downtime via real-time fault detection.
Example: A wastewater plant achieved 15% energy savings by using UR8LH to activate pumps dynamically during off-peak hours.
5. Competitor Comparison
- Higher Channel Density: 4 CT + 4 VT vs. 3+3 for most alternatives, ideal for large-scale projects.
- Extended Temperature Range: -40°C to +85°C vs. -10°C to 50°C standard, suitable for Arctic and desert environments.
- EMI Protection: 5,000Vrms isolation vs. 2,500Vrms, critical for high-voltage environments like mining.
UR8LH
6. Selection Recommendations
- I/O Density: Choose UR8LH for 4 CT/4 VT; upgrade to UR8TH (8 CT/8 VT) for higher density.
- Harsh Environments: Opt for UR8LH in extreme climates (e.g., offshore platforms, outdoor substations).
- Budget: Refurbished units (GE-certified) save 40% while retaining 12-month warranties.
7. Installation & Maintenance Notes
- Wiring: Use shielded twisted-pair cables for CT/VT inputs; torque terminals to 2.5 N·m to prevent voltage drops.
- Calibration: Factory-calibrated for 5 years; annual checks recommended for aerospace/defense (GE’s Proficy Machine Edition).
- Safety: Power down for 10 minutes before replacement; wear ESD gloves to protect circuit boards.
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