GE Multilin UR9TH CPU Module

Configured for high-speed protection and control in Universal Relay (UR) platforms, the GE Multilin UR9TH (UR9TH CPU Module) provides direct physical and electrical execution of relay processing, network communication, and system-level time synchronization.

Hardware Specifications

Industrial Control and Network Characteristics

• Backplane bus communication velocity: The UR9TH manages high-speed backplane traffic between I/O modules and the protection engine. This velocity is necessary to maintain deterministic processing loops for mission-critical power system protection.
• Profinet / EtherNet/IP deterministic networks: The module natively supports IEC 61850 and IEEE 1588 (PTP), enabling integration into deterministic substation automation networks. It provides the high-speed data acquisition required for synchronized grid monitoring and synchrophasor applications.
• I/O density scaling: The CPU acts as the central coordinator for the UR relay chassis, handling aggregated data streams from multiple I/O and CT/VT modules. It is engineered to scale across varying chassis sizes while maintaining real-time logic execution.
• Firmware flash compatibility: The hardware platform supports secure, field-upgradeable firmware, incorporating CyberSentry™ features to maintain NERC CIP compliance against evolving digital threats.

Frequently Asked Questions

Q: Does the hot-swappable design of the UR9TH affect relay protection logic?

A: The UR9TH supports hot-swapping; however, replacing a CPU module while the relay is active will result in a temporary loss of protection and control functions for the duration of the removal and the initialization phase of the replacement module. Ensure system interlocks are established before CPU extraction.

Q: How is IEEE 1588 time synchronization maintained during network interruptions?

A: The module maintains local oscillator stability to continue time-stamping events during transient network sync losses. Upon restoration of the PTP (IEEE 1588) master clock signal, the module automatically re-synchronizes its internal clock to the network time reference.

Field Installation Guidelines

• Mounting: Seat the UR9TH into the primary CPU slot of the Universal Relay chassis. Ensure the backplane interface is fully engaged before securing the module using the integrated locking mechanism.
• Grounding: The UR relay chassis must be securely bonded to the substation earth grid. A low-impedance ground is mandatory for the effectiveness of the module's internal cybersecurity isolation and electromagnetic noise suppression.
• Wiring: Connect dual Ethernet ports using shielded, category-rated cabling. Route all communication lines through dedicated signal conduits separated from high-voltage primary buswork to mitigate the risk of surge damage and inductive interference ingress.