Overview
Configured for voltage selection and monitoring in GE Multilin UR Series protective relay systems, the GE UR6LV (base model UR6LV) provides direct physical and electrical execution of VT signal routing based on breaker and disconnect status.
Suffix Breakdown & Model Matrix
The UR6LV module is available in specific hardware configurations determined by the ordering code. The primary variation is the voltage rating of the digital input channels used for monitoring breaker status.
| Ordering Suffix | Description | Digital Input Voltage |
|---|---|---|
| UR6LV (Standard) | Standard Voltage Selection Module | 24 V DC / 48 V DC |
| UR6LV-HV | High Voltage Digital Input Variant | 110-125 V DC / 220-250 V DC |
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model Brand | GE Multilin (General Electric) |
| Origin | Canada / USA |
| Weight | Approx. 0.3 kg (0.66 lbs) |
| Dimensions | Standard UR Series Single-Slot Module (approx. 18.5 x 13.5 x 3 cm) |
| Operating Temp | -40 degC to +60 degC (Continuous) |
| Power Consumption | < 5 W (Typical, backplane powered) |
| Nominal Voltage (Vn) | 50 to 240 V AC (Phase-to-Neutral) |
| Continuous Voltage Rating | 260 V AC |
| Burden | < 0.1 VA at nominal voltage |
| Frequency Range | 50 Hz or 60 Hz nominal (Tracking 20 to 65 Hz) |
| Voltage Accuracy | +/- 0.1% of reading (10 to 200 V) |
| Phase Angle Accuracy | +/- 0.1 deg |
| Sampling Rate | 64 samples per cycle |
| Digital Inputs | Form A / Form B contact monitoring |
| Programmable Debounce | 0 to 16 ms |
| Enclosure Protection | IP40 (Front), IP20 (Back Terminals) |
Backplane Bus Communication and Logic Integration
The UR6LV interfaces directly with the UR relay’s main processor via the internal backplane bus. This connection allows the module to execute voltage selection commands determined by the UR FlexLogic engine. The module supports high-speed data exchange, ensuring that VT signal routing status and digital input states are updated in real-time for protective elements such as synchronism check and distance protection. The logic configuration is managed through the EnerVista software suite.
Frequently Asked Questions
Q: Does the UR6LV support hot-swapping?
A: Yes, the module is designed for hot-swap installation in the UR chassis, provided the system voltage is isolated from the module terminals prior to removal or insertion to prevent arcing.
Q: What is the typical debounce setting for circuit breaker auxiliary contacts?
A: While programmable up to 16 ms, a setting of 4 to 8 ms is standard for dry auxiliary contacts to filter mechanical chatter without impacting protection speed.
Q: Can the UR6LV be used with both 50 Hz and 60 Hz systems?
A: Yes, the module supports automatic frequency tracking between 20 and 65 Hz, making it compatible with both standard power system frequencies.
Field Installation Guidelines
- Insertion: Ensure the UR relay chassis is de-energized or the specific slot is isolated. Slide the module into the designated I/O slot until the front panel latches engage.
- Wiring: Connect VT secondary leads to the module’s voltage input terminals. Ensure shielding is grounded at the panel entry point per standard EMC practices.
- Contact Inputs: Wire breaker auxiliary contacts to the digital input terminals. Verify polarity and voltage levels match the specific UR6LV variant (e.g., 24 VDC vs. 125 VDC).
- Configuration: Upon powering, use EnerVista to map the physical inputs to the FlexLogic engine and define the voltage selection logic based on the substation single-line diagram.
