Description
The GE UR6AV is a specialized voltage input module designed for the GE Multilin Universal Relay (UR) series. It serves as the primary interface for measuring AC voltages from potential transformers (PTs) or direct connections in power system protection, control, and monitoring applications.
Product Introduction
The UR6AV is a plug-in component for the modular GE UR platform (such as the G60, L90, or F60). It is engineered to provide high-speed, high-accuracy voltage sampling. The module converts analog voltage signals into digital data, which is then processed by the relay’s central processing unit to execute protection algorithms like under-voltage, over-voltage, and frequency tracking. Its robust design ensures performance in high-electromagnetic interference (EMI) environments typical of utility substations.
GE UR6AV
Product Parameters (Datasheet)
| Parameter | Specification |
| Model | UR6AV |
| Input Type | AC Voltage (Potential Transformer Interface) |
| Nominal Voltage | 120V / 240V AC (Standard) |
| Voltage Range | 0 to 300V AC (Continuous) |
| Accuracy | ±0.1% of reading from 10 to 300V |
| Sampling Rate | 64 to 128 samples per cycle (Application dependent) |
| Burden | < 0.1 VA at 120V |
| Isolation | 2 kV AC for 1 minute |
| Channels | Typically 4 or 8 channels per card (Configuration dependent) |
| Frequency Range | 20 Hz to 120 Hz |
Country of Origin
- Origin: Canada (GE Multilin, Markham, Ontario)
Application Areas
The GE UR6AV module is utilized in any scenario where precise voltage monitoring is required for grid stability:
- Transmission Line Protection: Used in the L90 or D60 relays for distance protection and synchrocheck.
- Generator Management: Integrated into the G60 relay to monitor stator voltage and frequency.
- Transformer Protection: Providing voltage data for over-excitation (V/Hz) monitoring in T60 relays.
- Bus Protection: Used for voltage-supervised overcurrent logic in B30 or B90 systems.
- Feeder Automation: Implementing under-voltage load shedding in the F60 relay.
Product Usage Instructions
1. Module Installation
- Ensure the UR chassis is powered down.
- Slide the UR6AV module into the designated slot (e.g., Slot F or G).
- Secure the module using the top and bottom screws to ensure a proper ground connection to the chassis.
2. Field Wiring
- Connect the secondary leads from the Potential Transformers (PT) to the module’s terminal block.
- Polarity: Maintain correct phase polarity (Va,Vb,Vc,Vn) to ensure accurate directional and power measurements.
- Use shielded twisted-pair cables for long runs to reduce induced noise.
3. Software Setup (Enervista UR Setup)
- Open the UR Setup software and navigate to the Hardware Configuration.
- Select the slot where the UR6AV is installed.
- Define the PT Ratio (e.g., 115,000V:115V) to ensure the relay displays primary voltage values.
Product Technical Description
The UR6AV utilizes a high-resolution A/D converter and a sophisticated filtering system.
- Anti-Aliasing: Hardware filters remove high-frequency noise before sampling.
- Dynamic Range: The module maintains linearity even during severe system faults, ensuring the protection logic receives “true” data during a collapse.
- Frequency Tracking: The module supports frequency tracking from 20Hz, allowing the relay to remain accurate during generator start-up or frequency swings.
Common Problems Q&A
Q: Can the UR6AV be used for DC voltage measurement? A: No, the UR6AV is specifically an AC voltage card. For DC battery or process monitoring, a dedicated DC Transducer (d) module or a generic Analog Input (4A) module is required.
Q: What does a “Major Self-Test Fault” related to the UR6AV mean? A: This usually indicates a failure in the A/D converter or a checksum error on the module’s local EEPROM. If reseating the module does not clear the fault, the module likely requires repair.
Q: How do I handle an “Off-Nominal Frequency” alarm? A: Ensure the UR6AV is connected to the primary voltage source designated as the “Frequency Tracking Source” in the relay settings. If the voltage signal is too low (typically < 5V), the tracking will fail.
Q: Can I hot-swap this module? A: No. While the UR series is modular, the chassis must be powered down before removing or inserting modules to prevent damage to the backplane communication bus.
Recommended Related Models
- GE UR6CT: The current transformer (CT) input module companion for current measurements.
- GE L90: Line Differential Relay (utilizes UR6AV for synchrocheck).
- GE G60: Generator Protection Relay (utilizes UR6AV for frequency and V/Hz).
- GE F60: Feeder Management Relay (common platform for UR6AV modules).
- GE T60: Transformer Management Relay.
