The UR9HH CPU Module is the core central processing unit of the Multilin UR Series Universal Relays under GE Vernova. Designed specifically for power system protection, control and automation applications, it serves as the “computing brain” of UR Series protective relays. It is responsible for executing complex protection algorithms, programmable logic operations, real-time data processing and system communication coordination.
As a key component of the modular hardware architecture, it is equipped with a high-performance Intel 80188 processor, reliable memory and communication interfaces. It is compatible with all UR Series protective relay models (including L90 Line Protection, T60 Transformer Protection, G60 Generator Protection, etc.). Featuring industrial-grade wide-temperature operation, strong anti-interference capability and high reliability, it supports long-term stable operation in harsh environments such as substations, power plants and industrial power systems. Its standardized modular design enables plug-and-play functionality, simplifying system expansion, spare parts management and maintenance. It also supports the EnerVista UR software for full-lifecycle configuration, monitoring and diagnostics, ensuring accurate protection and efficient control of critical power assets.
Technical Specifications
- Manufacturer: GE General Electric (GE Vernova)
- Product Position: CPU Processing Module for UR Series Universal Relays
- Processor: Intel 80188 16-bit embedded processor, clock speed 10–12 MHz
- Memory Configuration: 64 KB SRAM (operating memory), 128 KB ROM (firmware storage)
- I/O Capacity: Supports up to 1024 I/O points via UR Series I/O modules
- Communication Interface: 1×RS-485 (rear), supports Modbus RTU and other protocols
- Power Supply: 18.5–36 V DC (typical 24 V DC), power consumption approx. 6 W
- Physical Dimensions: Approx. 165 mm × 152 mm × 64 mm (6.5"×6"×2.5"), weight approx. 1.05 kg
- Environmental Rating: Operating temperature -40°C to +85°C, storage temperature -40°C to +85°C, humidity 5%–95% non-condensing
- Supporting Software: EnerVista UR Setup (configuration, commissioning, monitoring, firmware upgrade)
- Certifications & Standards: Compliant with IEC 61850, IEEE C37.118, IEC 60255 and other power industry standards
Key Features
High-Performance Real-Time Processing
Powered by the Intel 80188 processor, it efficiently executes power protection algorithms including overcurrent, differential, distance, overvoltage, undervoltage and zero-sequence protection, as well as custom programmable logic (PLC). With fast response and high computing accuracy, it meets the millisecond-level tripping requirements of power systems.
Modular System Coordination
As the core of the UR Series, it cooperates seamlessly with power supply modules (e.g., URRHH), I/O modules, analog acquisition modules and communication modules. It centrally coordinates data acquisition, command output and status feedback across all modules to form a complete protection and control system.
Reliable Communication & Data Exchange
Built-in RS-485 communication interface supports common industrial protocols such as Modbus RTU and DNP3. It enables two-way data transmission with upper-level SCADA systems and substation monitoring systems, uploading fault records and event logs, and receiving remote control commands.
Fault Diagnosis & Self-Recovery
Comprehensive built-in self-test mechanism monitors CPU, memory, communication and power status in real time. Alarms (indicator lights + event logs) are triggered immediately upon faults, and fault data is locked for quick troubleshooting. It supports program fault tolerance and abnormal recovery, reducing the risk of system downtime.
Industrial-Grade High-Reliability Design
Wide-temperature, wide-voltage and high EMC performance, fanless cooling, suitable for industrial and power field environments with dust, humidity and vibration. MTBF meets high-reliability standards for power systems.
Flexible Configuration & Operation
Visual configuration of protection logic, parameter thresholds, communication protocols and I/O mapping via EnerVista UR software. Supports online monitoring, offline simulation, firmware upgrades and historical data export, simplifying commissioning and maintenance.
Installation & Maintenance
(I) Installation Procedure
Safety Preparation
Before installation, ensure the entire UR Series relay is completely powered off. Disconnect the DC power circuit and place warning tags to prevent electric shock or short circuits. Verify the module model is UR9HH and confirm hardware version compatibility.
Hardware Installation
Remove the dust cover from the corresponding CPU slot of the relay. Align the module with the slot guide rails and slide the UR9HH firmly into place until the gold-plated connectors are fully engaged and the latches are locked.Check for secure, stable installation. Connect RS-485 communication cables if required, ensuring tight terminal connections and correct polarity.
Power-Up & Initialization
Restore system power and observe module status indicators: the RUN light is steady or flashing under normal operation, and the FAULT light is off. If the FAULT light remains lit, check installation, power supply or module hardware.
Software Configuration
Connect to the module via EnerVista UR software, download the corresponding protection program and configuration parameters. Verify I/O, communication and protection logic before putting into service.
(II) Routine Maintenance
- Regular Inspection: Check indicator status, mounting stability and terminal tightness/oxidation monthly. Clean surface dust with power off.
- Data Backup: Back up CPU programs, configurations, event logs and fault records quarterly to secure media for fast recovery.
- Firmware Management: Upgrade firmware during system outages per GE official notices. Always back up data before upgrading to avoid incompatibility.
- Environment Monitoring: Maintain temperature and humidity within rated ranges, away from strong EMI sources, corrosive gases and vibration.
(III) Fault Replacement
- Shut down and power off the system; perform full program and configuration backup.
- Remove the old module and install a UR9HH module of the same model and version.
- After power-up, restore backup programs and parameters via EnerVista UR. Verify functionality before returning to service.
Applications
As the core of UR Series protective relays, the UR9HH CPU Module is widely used in power generation, transmission, substation, distribution and industrial power scenarios:
Power Substations
Protection and control of lines, transformers, buses and capacitor banks in 110 kV–500 kV substations, enabling fast fault clearance, data acquisition and remote monitoring.
Power Plants
Applied to generator protection systems (G60 Generator Protection Relay) for steam and hydro generators, executing differential, overvoltage, loss-of-field, reverse power and other protection logic.
Industrial Power Systems
Protection of station transformers, high-voltage motors and feeder circuits in petrochemical, metallurgical, paper, mining and other large industrial facilities, ensuring continuous power supply for production.
Renewable Energy Grid Integration
Protection of step-up transformers and grid-connected lines in wind and solar power plants, adapting to distributed control and protection requirements.
Power Grid Stability Control
Participates in regional power grid stability control and wide-area protection systems (R-GOOSE), enabling cross-station data exchange and coordinated control.
Frequently Asked Questions (FAQ)
Q1: What is the difference between UR9HH and UR9EH / UR9GH CPU modules?A: All are UR Series CPU modules. The main differences lie in communication interfaces and features: UR9HH is equipped with RS-485 only, no Ethernet. UR9EH/UR9GH include Ethernet ports (supporting IEC 61850, Modbus TCP) for more complex network applications. Select based on system communication requirements.
Q2: What causes the FAULT red light to stay on?A: Common causes: ① Poor contact due to incompletely inserted module; ② Abnormal supply voltage (<18.5 V or >36 V DC); ③ Corrupted program or incorrect configuration; ④ Hardware failure. Troubleshooting: Re-seat the module, verify power, restore backup program, test with a replacement module.
Q3: Which communication protocols does UR9HH support?A: Via the RS-485 interface configured in EnerVista UR, it supports Modbus RTU, DNP3, IEC 60870-5-103 and other power industry protocols for connection to SCADA and integrated automation systems.
Q4: Does it support hot swapping?A: Hot swapping is not supported. As a core processing module, the entire system must be powered off before replacement to avoid short circuits, program corruption or system runaway.
Q5: Will stored programs and data be lost?A: Operating programs and configurations are stored in non-volatile ROM/Flash and retained after power loss. Temporary runtime data in RAM is cleared on power failure. Regular backup of critical configurations to external media is recommended.
Q6: Which UR Series protective relays is it compatible with?A: Fully compatible with all UR models, including L90 (Line), T60 (Transformer), G60 (Generator), M60 (Motor), F60 (Feeder), C60 (Capacitor) and others.
Q7: How to upgrade UR9HH firmware?A: ① Back up data via EnerVista UR; ② Download the official firmware package from GE; ③ Connect the software and perform firmware upgrade; ④ Verify programs and functions after completion; restore from backup if abnormal.
Q8: What is the operating temperature range?A: Standard operating temperature: -40°C to +85°C, exceeding conventional industrial grades, suitable for extreme cold/hot outdoor substations and industrial sites.
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