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GE Multilin UR7JH UR-7JH Universal Relay Protection and Control Unit

The GE Multilin UR7JH, also cataloged as the UR7JH Universal Relay Protection and Control Unit, operates as a dedicated hardware component for power system protection, measurement, and control execution within GE Multilin Universal Relay (UR) platform networks.

Hardware Specifications

Parameter	Specification
Model	UR7JH
Brand	GE Multilin
Dimensions	19-inch rack mount, 7U chassis height
Operating Temp	-40 deg C to +60 deg C
Power Consumption	25-45 W dependent on installed I/O cards
Series	Universal Relay (UR) Platform
Processor Unit	High-performance 32-bit RISC microprocessor
Power Supply Options	110-250 V DC / 110-240 V AC or 24-48 V DC
Current Inputs	1 A / 5 A CT secondary nominal, field selectable
Voltage Inputs	50-240 V AC nominal RMS phase-to-neutral
Frequency Range	50 Hz / 60 Hz nominal, 20-65 Hz tracking
Digital Inputs	Optically isolated contact sense or voltage driven inputs
Output Relays	Form A / Form C high-speed tripping and control contacts
Communication Interfaces	RJ45 10/100Base-T, SC/ST fiber optic, RS485 / RS232
Supported Protocols	IEC 61850 Ed. 1 & Ed. 2, Modbus RTU, Modbus TCP/IP, DNP 3.0, IEC 60870-5-104
Time Synchronization	IEEE 1588 PTP, IRIG-B, SNTP
Protection Rating	IP40 front panel, IP20 rear terminals

Profinet / EtherNet-IP Deterministic Network Integration

The GE Multilin UR7JH uses the Universal Relay modular architecture to support deterministic industrial communication structures through Ethernet-based interfaces and substation automation protocols. The hardware configuration supports communication module expansion, redundant Ethernet configurations, and structured data exchange with SCADA and DCS systems.

The relay platform incorporates programmable FlexLogic control execution, allowing internal processing of protection commands, interlocking functions, and switching sequences without external PLC execution. Event recording, oscillography, fault location processing, and diagnostic data generation are handled through the internal processing architecture.

The modular design supports I/O density scaling through interchangeable plug-in modules. Dual power supply configurations allow separated supply paths for increased system availability, while firmware flash compatibility enables controlled feature updates within supported UR platform configurations.

Frequently Asked Questions

Q: Does the UR7JH support hot-swappable power supply replacement?
A: The UR7JH supports dual hot-swappable power supply options according to the provided configuration data. Replacement procedures must follow GE Multilin service instructions and site safety requirements.

Q: What communication protocols are supported by the UR7JH hardware?
A: The unit supports IEC 61850 Ed. 1 and Ed. 2, Modbus RTU, Modbus TCP/IP, DNP 3.0, and IEC 60870-5-104 communication protocols through available interfaces.

Q: Can the UR7JH execute control logic without an external PLC?
A: Yes. The integrated FlexLogic programming environment provides internal execution of control algorithms, interlocks, and automated switching logic.

Field Installation Guidelines

Install the UR7JH in a compatible 19-inch rack mounting structure with adequate mechanical support for the 7U chassis assembly. Verify power supply module compatibility before wiring AC or DC input sources.

Terminate current transformer and voltage transformer circuits using approved protection relay wiring practices. Maintain separation between measurement circuits, communication cables, and high-energy switching conductors to reduce electromagnetic interference.

Use shielded communication cables where required by the installation environment. Connect cable shields according to site grounding procedures and avoid parallel routing with high-current conductors.

Verify terminal block torque, module seating, and communication connector engagement before energizing the relay. Confirm firmware compatibility and configured I/O module recognition during commissioning.

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