UR9UH GE Multilin Universal Relay Series Datasheet & Technical Manual

GE Multilin UR9UH Universal Relay Series CPU Module

The GE Multilin UR9UH serves as the primary UR9UH CPU Module utilized to execute specific technical tasks across GE Multilin UR Series platforms. The hardware functions as the central logic engine, executing real-time protection, control, and automation equations within a cycle response time of less than 5 ms. It processes input signals received from auxiliary chassis cards and runs user-configured control logic to generate high-speed tripping matrix outputs, while simultaneously managing data acquisition, timestamped event recording, and IEEE C37.118 synchrophasor data streams.

Hardware Specifications

Profinet / EtherNet/IP Deterministic Networks and I/O Density Scaling

The UR9UH central processor regulates internal data queues to preserve fixed backplane bus communication velocity across all active expansion slots. During high-density I/O density scaling implementation phases, the processor dynamic allocation engine structures peripheral status packets to ensure zero-collision transmission paths. This network architecture prevents jitter when data arrays map to external Profinet or EtherNet/IP deterministic networks via gateway links. The card uses strict microcode checksum handshakes to maintain total firmware flash compatibility, preventing execution drops during high-bandwidth telemetry conditions.

Frequently Asked Questions

Q: Can the UR9UH CPU module be removed or hot-swapped while the transformer or generator protection loops are actively armed?

A: No. Removing the module breaks the internal backplane bus data lines and removes power from the primary logic engine. This action causes an immediate loss of all protective functions, clears active communication buffers, and forces a complete rack shutdown that requires a manual cold-reboot cycle.

Q: How does the UR9UH preserve localized disturbance captures and data sequences when an external sub-station power failure occurs?

A: The module writes event data directly to on-board non-volatile flash memory cells. All software code arrays, configuration settings, and structural fault records commit to physical solid-state sectors, preserving system parameters without needing internal backup batteries.

Field Installation Guidelines

• Electrostatic Discharge Precautions: Ground the 0.93 kg hardware module assembly properly before insertion. Maintenance personnel must attach an ESD wrist strap connected to a verified enclosure earth ground point prior to accessing the chassis slot.
• Backplane Insertion Controls: Line up the module circuit card edge with the guide rails inside the standard UR chassis. Push the card straight back with a single smooth motion until the multi-pin connector locks into the passive backplane receiver, then tighten the front panel retaining fasteners.
• Fiber Optic Port Alignment: Clean the optical connection faces with clean fiber wipes prior to snapping the 100 Base-FX cables into place. Maintain minimum bend radius specifications for fiber optic paths to avoid signal loss or communication dropouts.
• Network Path Demarcation: Route all external Ethernet, fiber, and serial communication paths through separate wire trays away from high-voltage AC current transformer secondary lines to suppress common-mode electromagnetic coupling.