UR-9AH
UR-9AH
UR-9AH
UR-9AH
UR-9AH

GE UR-9AH | UR Series Universal Relay CPU Module – Core Processor

  • Model: UR-9AH
  • Alt. P/N: UR9AH
  • Product Series: GE Multilin UR Universal Relay Platform
  • Hardware Type: Slot-in main CPU module (the “brain” of UR relays)
  • Key Feature: Runs protection logic, fault processing, + dual RS485/ETH communication
  • Primary Field Use: Central processor for feeder, generator, transformer, and bus protection relays
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Description

Hard-Numbers: Technical Specifications

  • Processor Core: High-speed 32-bit DSP + RISC controller
  • Communication Ports: 2×RS485 (Modbus RTU), 1×10/100Base-T Ethernet (Modbus TCP)
  • Logic Execution: 1ms scan rate; supports 1000+ logic elements (gates/timers/latches)
  • Operating Temperature: -40°C to +70°C (industrial substation grade)
  • Isolation Rating: 2500Vrms (backplane-to-field isolation)
  • Power Draw: 8.5W (backplane supplied; typical for UR CPU)
  • Memory: 128MB RAM; 256MB flash (stores firmware, settings, fault records)
  • Hot-Swap: Yes (live insertion/removal; auto-syncs config)
  • Dimensions: 150mm × 180mm × 40mm
  • Weight: ~1.17kg (2lb 9oz)
  • Software: Configured via EnerVista UR software
UR-9AH

UR-9AH

The Real-World Problem It Solves

Older UR CPUs lacked Ethernet and high-speed logic, limiting relay coordination and remote monitoring. UR-9AH delivers modern processing + comms to legacy/new UR chassis, unifying protection, control, and data acquisition.

Where you’ll typically find it:

  • Transmission substations (115kV–500kV) running F35 (feeder), G60 (generator), T60 (transformer) relays
  • Industrial power plants (oil/gas, steel) with medium-voltage switchgear and generator auxiliaries
  • Renewable energy farms (wind/solar) requiring grid interconnection protection
  • Distribution hubs needing coordinated overcurrent, distance, and arc-flash protection

Bottom line: It’s the UR system core—fast logic, robust comms, wide compatibility, hot-swap capable, for all UR protection applications.

 

Hardware Architecture & Under-the-Hood Logic

UR-9AH is the master controller, coordinating all I/O modules and executing protection algorithms.

  1. Backplane interface connects to CT/VT (UR-8xx), DI/DO, and communication modules.
  2. DSP processes analog data (16-bit samples) and runs protection algorithms (overcurrent, distance, differential).
  3. RISC core handles logic, HMI, and communications (RS485/ETH).
  4. Fault records, event logs, and oscillography stored in flash memory.
  5. Hot-swap controller manages live insertion; auto-loads config from non-volatile memory.
  6. EnerVista UR software connects via Ethernet/RS485 for setup, monitoring, and firmware updates.

 

Field Service Pitfalls: What Rookies Get Wrong

Mismatching Old vs. New CPU + CT/VT ModulesTechs pair UR-9AH (new-gen CPU) with old 8CT/VT modules or vice versa. This causes DSP ERROR / HARDWARE MISMATCH—relay fails to boot.

  • Field Rule: UR-9AH requires Rev C or later 8xx I/O modules; old CPUs (UR-9CH/9DH) pair with Rev A/B I/O.

Overlooking IP Conflict in Multi-Relay SubstationsNew techs deploy multiple UR-9AH relays with default IP (192.168.1.1). Ethernet comms fail; relays go offline.

  • Quick Fix: Assign unique static IPs; use EnerVista to set subnet/gateway; test ping before commissioning.

Underpowering the Chassis in High-Density RacksTechs fill a 12-slot chassis with UR-9AH (8.5W) + 8xx I/O (6–7W each). Total power exceeds backplane 60W limit; CPU resets randomly.

  • Field Rule: Budget 9W/CPU + 7W/I/O; keep total <55W; use redundant power supplies for 9+ slots.
UR-9AH

UR-9AH

Commercial Availability & Pricing Note

Please note: The listed price is for reference only and is not binding. Final pricing and terms are subject to negotiation based on current market conditions and availability.

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