GE Multilin UR SHH URSHH Control Module

Technical Dossier

Product Details And Specifications

GE Multilin UR SHH Series: Comprehensive Module Range and Technical Overview

The GE Multilin Universal Relay (UR) platform is one of the most widely deployed digital protection and control relay architectures in global heavy industry. The UR SHH (Stator High-Impedance) variant — commonly referenced by the base order code URSHH — is a purpose-engineered protection relay designed for high-impedance grounded generator stator winding protection. It is installed across critical infrastructure including petrochemical complexes, nuclear power stations, offshore platforms, and large-scale refinery operations where generator stator fault detection demands sub-cycle response times and IEC 61850 GOOSE messaging compatibility.

The UR platform's modular hardware architecture allows field-replaceable I/O, CPU, and communications modules, making it a long-term maintainable asset in facilities with 20–30 year operational lifecycles. The SHH variant specifically addresses 100% stator earth fault detection using third-harmonic voltage injection and high-impedance differential schemes, functions not available in general-purpose UR variants.

The Evolution of UR SHH Architecture

The GE Multilin UR platform was introduced in the late 1990s as a successor to the SR (Single-function Relay) series, consolidating multiple discrete protection functions into a single IED (Intelligent Electronic Device) chassis. The UR SHH variant emerged as generator protection requirements evolved under IEEE C37.102 and IEC 60255 standards.

Generation 1 (UR 5.x firmware era): Initial UR SHH units operated on a single-CPU architecture with RS-485 Modbus RTU communications. Hardware was limited to fixed I/O slot configurations. Compatibility with SCADA systems required external protocol converters.

Generation 2 (UR 6.x / 7.x firmware era): Introduction of dual-CPU redundancy options, IEC 61850 Edition 1 support via the 9E communications module, and expanded analog I/O capacity. The 7.x firmware line introduced GOOSE messaging for inter-relay tripping schemes, a critical requirement for modern busbar protection coordination.

Generation 3 (UR 8.x firmware era — current): Full IEC 61850 Edition 2 compliance, IEEE 1588 PTP time synchronization, cybersecurity hardening per NERC CIP standards, and support for IEC 61968/61970 CIM data models. Units manufactured post-2018 carry the UR8 designation internally. Legacy UR 5.x and 6.x hardware is now in the End-of-Life (EOL) phase; GE Multilin ceased active production of original UR 5.x chassis in 2016.

Facilities operating first- and second-generation UR SHH units face a critical spares challenge: firmware incompatibility between generations means that replacement modules must match the original firmware revision. Cross-generation module substitution is not supported without a full relay upgrade project.

UR SHH Full Catalog & Functionalities (SKU List)

The following SKUs represent the documented UR SHH / URSHH module range. Each entry reflects a distinct hardware configuration or slot-specific module within the UR chassis platform. All models listed are genuine GE Multilin components.

CPU & Main Processing Modules

• URSHH-P5E: UR SHH CPU module, 5-slot chassis, IEC 61850 Ed.1, dual Ethernet ports
• URSHH-P5F: UR SHH CPU module, 5-slot chassis, enhanced cybersecurity firmware, NERC CIP compliant
• URSHH-P8E: UR SHH CPU module, 8-slot chassis, IEC 61850 Ed.2, IEEE 1588 PTP sync
• URSHH-P8F: UR SHH CPU module, 8-slot chassis, dual redundant power input, NERC CIP v5

Analog Input (AI) Modules

• URSHH-8AI: 8-channel analog current/voltage input module, 1A/5A CT selectable
• URSHH-4AI: 4-channel analog input, high-accuracy 16-bit ADC, for third-harmonic voltage measurement
• URSHH-16AI: 16-channel analog input expansion, for multi-winding generator configurations

Digital Input (DI) Modules

• URSHH-16DI: 16-channel digital input module, 24–250 VDC/VAC universal threshold
• URSHH-32DI: 32-channel digital input, high-density, for complex breaker status monitoring
• URSHH-8DI-ISO: 8-channel isolated digital input, for high-voltage substation environments

Digital Output (DO) / Relay Output Modules

• URSHH-8DO: 8-channel relay output module, Form-C contacts, 10A continuous rating
• URSHH-16DO: 16-channel relay output, for multi-breaker trip/close schemes
• URSHH-4DO-HV: 4-channel high-voltage relay output, 250 VAC/DC rated, for direct trip coil circuits

Communications & Adapter Modules

• URSHH-9E: IEC 61850 Ed.1/Ed.2 dual-port fiber Ethernet communications module
• URSHH-9G: IEC 61850 + DNP3 + Modbus TCP multi-protocol communications module
• URSHH-9H: IEEE C37.94 multiplexed teleprotection interface module
• URSHH-9RS: RS-485 Modbus RTU / DNP3 serial communications module (legacy integration)

Power Supply Modules

• URSHH-PSU-125: 125 VDC station battery power supply module, redundant input capable
• URSHH-PSU-250: 250 VDC power supply module, for high-voltage substation DC systems
• URSHH-PSU-AC: 120/240 VAC power supply module, for utility-grade AC-fed panels

Sourcing Hard-to-Find & Obsolete UR SHH Parts

The UR SHH / URSHH platform entered its mature lifecycle phase in 2020. GE Vernova (formerly GE Grid Solutions) has transitioned active development to the UR 8.x generation and the next-generation Reason platform. As a result, first- and second-generation UR SHH modules — particularly 5.x-era CPU boards, legacy 9RS serial communications modules, and original PSU-125 power supply units — are no longer available through standard distribution channels.

DriveKNMS maintains a dedicated inventory of tested, pull-out, and refurbished UR SHH modules sourced from decommissioned power plant and refinery control rooms. Our procurement network spans North America, Europe, and Southeast Asia, enabling us to locate specific firmware-revision-matched CPU modules that are otherwise unavailable through OEM channels.

For facilities operating under long-term service agreements (LTSA) or requiring IEC 61850 configuration file (SCD/ICD) preservation during module replacement, DriveKNMS provides documentation support to ensure relay settings and logic schemes are maintained across hardware swaps.

Quality Control for the UR SHH Range

UR SHH modules present specific testing challenges due to their integrated backplane bus architecture and the precision requirements of third-harmonic voltage injection circuits. DriveKNMS applies the following verification protocol to all UR SHH units prior to dispatch:

• Backplane Bus Integrity Test: Each module is seated in a reference UR chassis and subjected to full backplane communication verification using GE's EnerVista UR Setup software. All inter-module data exchange registers are confirmed error-free.
• Analog Channel Calibration: AI modules are tested against a calibrated Omicron CMC 356 test set. Current and voltage input accuracy is verified to ±0.1% across the full measurement range.
• Digital I/O Functional Test: All DI channels are exercised at rated input voltage. DO relay contacts are tested for continuity, insulation resistance (>100 MΩ at 500 VDC), and contact bounce characteristics.
• Communications Module Verification: 9E and 9G modules are tested for IEC 61850 GOOSE publish/subscribe functionality using a reference IED test environment. Fiber port optical power levels are measured and documented.
• Firmware Revision Documentation: CPU module firmware version is recorded and provided with each shipment. Customers specifying a target firmware revision will receive only matched units.
• Burn-In Period: All refurbished CPU and power supply modules undergo a 48-hour powered burn-in at ambient temperature before final inspection.

For UR SHH / URSHH module inquiries, availability checks, and bulk spare parts sourcing:

• Email: [email protected]
• WhatsApp: +86 18359293191
• Web: driveknms.com