Description
Key Technical Specifications
- Input Voltage: 125-250V AC/DC (High Range)
- Output Power: 35 Watts
- Internal Fuse: 4A / 250V
- Weight: ~1.3 kg
- Dimensions: 6.51″ x 6.51″ x 4.5″
- Isolation: 2000V AC / 2300V AC
- Diagnostics: LED Status (Power Up, Cycle, Fail)
- Redundancy: Optional (Configurable)
- Mounting: UR Relay Chassis
- Application: Overcurrent, Differential, Distance Protection
Product Introduction
Protection relays are useless without clean power. The GE URRHH is the high-range power supply for the Multilin UR family, taking 125-250V AC/DC and regulating it down for the relay logic and dry contact inputs. It’s the first thing to fail if you get a station battery surge or a lightning strike on the control wiring.
You don’t buy a GE URRHH for fun; you buy it because your relay is dead and the substation is unmonitored. With 35W output and 2000V isolation, it handles the dirty station power that would fry a standard DIN-rail supply. The built-in self-test tells you if it’s failing before it takes the relay with it. Bottom line: keep a spare in the cabinet, or plan on a long outage when it pops.
Troubleshooting Quick Reference
| Fault | Cause | Relevancy | Quick Check | Fix |
|---|---|---|---|---|
| No LEDs / Dead Relay | Blown Internal Fuse | 90% | Measure 125-250V at input terminals. Check 4A fuse continuity. | Replace GE URRHH. Fuses don’t blow for no reason. |
| “Power Fail” LED | Input Voltage Low | 80% | Measure station battery/AC at source. Check wiring lugs. | Fix station power. If input is good, swap PSU. |
| Intermittent Resets | Loose Backplane Conn | 70% | Reseat module. Check chassis ground strap. | Clean contacts. Tighten mounting screws. |
| Overvoltage Trip | Station Spike | 60% | Check event log for “Overvoltage”. Inspect surge arrestors. | Replace GE URRHH. Investigate station grounding. |
| Hot to Touch | Overload / Short | 50% | Disconnect load. Measure output current. | Isolate short on dry contact inputs. Replace PSU. |
GE URRHH
Application Scenarios & Pain Points
- Transmission Line Protection: High fault currents induce noise. The GE URRHH isolation keeps the logic clean. Pain point: Nuisance trips from ground loops. This PSU blocks them.
- Generator Differential: Critical asset. The GE URRHH redundancy option (if configured) keeps the relay alive during a PSU failure. Pain point: Single point of failure. Not with dual GE URRHH setup.
- Substation Aux Power: Dirty 125V DC from old batteries. The GE URRHH wide input range handles the ripple. Pain point: Brownouts during breaker ops. This PSU rides through them.
