Description
The GE URRHH is a specialized high-speed contact output module belonging to the Multilin Universal Relay (UR) series (including models like the D60, G60, and L90). It is designed for protective relaying applications where milliseconds matter—specifically for high-speed tripping of circuit breakers and high-speed signaling in utility and industrial power systems.
Product Parameters (Datasheet)
- Model Number: URRHH (Module Code “H” in the UR order code)
- Series: GE Multilin Universal Relay (UR)
- Output Type: 8 High-Speed Form-A (Normally Open) Contacts
- Operating Time: < 4 ms (Total clearing time including bounce)
- Continuous Current: 8 A
- Make & Carry (0.2s): 30 A (per IEEE C37.90)
- Breaking Capacity: Designed for high-inductive DC loads (e.g., 10 A @ 125 V DC L/R=40ms)
- Isolation: 2 kV AC dielectric strength for 1 minute
- Mounting: Occupies one I/O slot in the UR 19-inch subrack
GE URRHH
GE URRHH
GE URRHH
Country of Origin
This protection module is engineered and manufactured by GE Grid Solutions (formerly GE Multilin) in Canada, a global leader in substation automation and power protection.
Application Fields
The URRHH is utilized in high-speed protection schemes:
- Generator Protection (G60): Providing ultra-fast tripping of field breakers and main breakers during fault conditions.
- Transmission Line Protection (L90): Used for high-speed pilot tripping and teleprotection signaling between substations.
- Transformer Protection (T60): Executing rapid isolation of power transformers during internal winding faults.
- Breaker Failure Logic: Triggering adjacent breakers with minimal delay when a primary breaker fails to clear a fault.
- Arc Flash Mitigation: Drastically reducing incident energy by accelerating the total fault clearing time.
Product Usage Instructions
- Chassis Slotting: Ensure the UR chassis is powered down. Slide the URRHH module into its designated slot (typically slots F through M, depending on the relay model).
- Wiring: Use 12–14 AWG wire for trip circuits. Because these are high-speed contacts, ensure that any external transient suppression (diodes/MOV) is properly sized to avoid slowing down the contact release.
- Firmware Compatibility: The module is automatically detected by the CPU. Ensure the relay firmware is updated to support the specific hardware revision of the URRHH module.
- Logic Configuration: In the EnerVista UR Setup software, assign the high-speed contact to the “Trip” or “Close” logic operands. These contacts are typically mapped to “Virtual Outputs” within the relay’s FlexLogic.
- Testing: Perform a timing test using a relay test set to verify that the contact closure occurs within the specified 4ms window from the logic trigger.
Product Technical Description
The URRHH module is technically distinct from standard relay modules (like the UR8C) because of its High-Speed Hybrid design. It combines solid-state components for near-instantaneous current “making” and robust mechanical contacts for sustained current carrying. This “hybrid” approach allows the module to overcome the physical inertia of traditional mechanical relays. In a typical protection scheme, the URRHH can shave 4–8 ms off the total fault clearing time. In high-voltage substations, this time savings is critical for maintaining grid stability and preventing catastrophic equipment damage during phase-to-phase faults.
Q&A (Common Questions)
- Q: Can the URRHH be used for both Tripping and Closing?
- A: Yes, it is rated for both duties. However, its high-speed characteristics are most beneficial for Tripping applications.
- Q: How does the URRHH differ from the UR6H module?
- A: The specific digit (6 vs 8) often refers to the number of output points or the generation of the module. Always consult the specific “Order Code” of your relay to ensure you are selecting the correct contact density.
- Q: Do these contacts require external “Wetting” voltage?
- A: Yes, like most dry contacts, they require an external DC power source (typically the substation battery bank, 48V/125V/250V DC) to drive the load.
- Q: Can I hot-swap this module?
- A: No. GE Multilin UR modules are not hot-swappable. The relay must be powered down to prevent damage to the internal data bus.
Similar Model Recommendations
- GE UR8C: Standard Form-C (Changeover) contact module.
- GE URHI: High-voltage Digital Input module.
- GE G60-N00-HPH-F8H: A typical Generator Protection relay configuration including URRHH modules.
- GE UR8M: Form-A/Form-C combination contact module.
- GE L90-N00-HPH-F8L: A Line Differential relay configuration for transmission protection.
For technical documentation or a quote for the GE URRHH, please contact our power protection technical team.
