GE URRHH - Universal Redundant Relay Housing for Mark VI and Mark VIe Control Systems

GE URRHH – Universal Redundant Relay Housing for Mark VI and Mark VIe Control Systems

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Product Introduction:
The URRHH is a specialized relay output housing module designed for GE Mark VI and Mark VIe gas turbine and generator control systems. The designation breaks down as Universal (U), Relay (R), Redundant (R), High-Reliability (H), and Housing (H). This module serves as the physical enclosure and interface for critical protection relay outputs. It houses the relay cards that execute the final trip commands for the turbine, generator, and associated plant equipment. The dual redundant designation ensures that both the A and B sides of the protection system have identical relay capability, allowing the system to trip even if one entire side of the control rack fails.

Technical Specifications:
Module Type: Universal Relay Housing (Redundant, High-Reliability)
System Compatibility: GE Mark VI, Mark VIe, and Mark V control systems
Relay Channels: Typically 16 or 32 Form-C (Changeover) relay outputs per housing
Contact Rating: 5 Amps at 250V AC (Resistive), 2 Amps at 125V DC (Inductive)
Coil Voltage: 24V DC, 48V DC, or 125V DC (configurable per card)
Redundancy: Full A/B redundant architecture with automatic cross-monitoring
Response Time: Less than 10 milliseconds from command to contact closure
Isolation: 1500V RMS channel-to-ground isolation
LED Indicators: Per-relay status LEDs (green for energized, red for de-energized, amber for fault)
Form Factor: Standard 6U VIC Eurocard
Operating Temperature: 0 to 60 degrees Celsius

Functional Features:
Dual Redundant Relay Banks: Both A and B sides contain identical relays; the system monitors both sides continuously for agreement.
Coil Supervision: Each relay coil is continuously monitored for open-circuit or short-circuit faults, with immediate alarming to the operator.
Fail-Safe Design: Relays default to a pre-configured safe state (typically de-energized for trip circuits) upon loss of power or CPU communication.
Hot-Swappable Relay Cards: Individual relay cards can be removed and replaced while the system is running in redundant mode.
Manual Trip Pushbutton: Front-panel test/trip pushbutton allows operators to verify relay operation without initiating an actual trip.
Status Annunciation: Comprehensive LED display shows the real-time state of every relay in the housing.

Application Scenarios:
Turbine Emergency Trip: Sends the signal to close main fuel stop valves and steam stop valves during overspeed or vibration trips.
Generator Breaker Trip: Energizes the trip coil to open the generator circuit breaker and disconnect the turbine from the grid.
Auxiliary Equipment Control: Switches large contactors for lubrication oil pumps, seal oil systems, and hydraulic power units.
Fire and Gas System Activation: Trips fire suppression systems and activates gas detection alarms in hazardous areas.

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