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GE Multilin URRHH UR-RHH Universal Relay

Configured for electrical protection, control, and automation execution in power system networks, the GE Multilin URRHH (URR Universal Relay) provides direct physical and electrical execution for transmission and distribution protection schemes. The relay processes sampled electrical waveforms, executes programmable logic, and manages protection outputs through modular I/O and communication interfaces.

Hardware Specifications

Parameter	Specification
Model	URRHH / URR
Brand	GE Multilin
Origin	Markham, Ontario, Canada
Weight	0.62 kg
Dimensions	4 cm x 22.5 cm x 29.2 cm
Operating Temp	-40 deg C to +60 deg C
Power Consumption	Not specified
Architecture	Modular chassis with expandable I/O cards and plug-in modules
Processor	Digital signal processor (DSP) with real-time waveform sampling
Power Supply Options	110-250 V DC / 110-240 V AC or 24-48 V DC
Display Interface	Front panel graphical LCD with navigation keys and status LEDs
Communication Ports	Ethernet RJ45, fiber optic, RS485 serial
Protocol Support	IEC 61850, DNP3.0, Modbus RTU/TCP, IEC 60870-5-103/104
Protection Functions	Distance protection, overcurrent, voltage, frequency, synchrocheck, auto-reclosing, breaker failure
Software	EnerVista UR

IEC 61850 Protection Logic and Communication Processing

The GE Multilin URRHH uses a modular protection architecture with DSP-based signal acquisition and GE EnerVista FlexLogic programmable control. The relay supports IEC 61850 GOOSE and Sampled Values communication for substation automation schemes. PRP and HSR redundancy functions provide network path management for high-availability Ethernet configurations.

Protection processing includes phase and ground distance elements, directional and non-directional overcurrent functions, voltage and frequency supervision, synchrocheck logic, auto-reclosing control, thermal overload monitoring, and breaker failure detection. Metering functions include RMS voltage, current, power factor, active power, reactive power, and frequency measurement.

Frequently Asked Questions (FAQ)

Q: Does the URRHH support modular hardware expansion?
A: Yes. The URRHH uses a modular chassis design with expandable I/O cards and plug-in hardware modules.

Q: Which communication protocols are supported by the relay?
A: The relay supports IEC 61850, DNP3.0 serial and TCP, Modbus RTU/TCP, and IEC 60870-5-103/104 communication protocols.

Q: What type of logic configuration is available for control functions?
A: GE EnerVista FlexLogic provides programmable logic functions for interlocks, control schemes, and protection-related automation sequences.

Field Installation Guidelines

Install the relay in a protected control panel environment with adequate mechanical support and proper terminal access clearance. Connect protective earth grounding according to site electrical standards before applying auxiliary power.

Use shielded cables for sensitive signal circuits and terminate cable shields according to the grounding design of the protection system. Separate communication wiring from high-current power conductors to reduce electromagnetic interference.

Verify auxiliary supply voltage compatibility before energizing the device. Confirm CT and VT secondary wiring polarity, phase identification, and protection setting parameters before commissioning. Network connections should be checked for correct fiber, Ethernet, or serial communication configuration before integration into the substation automation system.

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