GE UR8FV CT VT Analog Input Module For Multilin UR Series Protection Relays
- Product Code: UR8FV
- Availability: In Stock
GE UR8FV CT/VT Analog Input Module For Multilin UR Series Protection Relays
Manufacturer: GE Multilin (GE Grid Solutions)
Model: UR8FV (CT/VT Transformer Sensing Module)
Compatible Host: All UR universal protection relays (F60, T60, G60, C60, UR30/50/70/80/90)
Type: Internal plug-in analog daughter card, dedicated CT/VT secondary signal acquisition, fully isolated analog front-end
Core Function: Sample 3-phase load current, ground residual current and bus voltage from CT/VT secondary; high-precision power parameter measurement (I, V, P, Q, THD); supply raw analog data for overcurrent, earth fault, over/under voltage, phase unbalance protection algorithms; per-channel circuit self-diagnosis, CT open-circuit & VT fuse loss detection
1. Product Overview
UR8FV is the core analog sampling expansion card for GE UR series multifunction protection relays, completely different from UR6EV/UR6PH digital switch I/O modules. It is installed inside the relay chassis via internal backplane slot, powered by the main unit 24VDC bus.
Channel allocation: 3 phase CT (A/B/C), 1 neutral/ground CT, 4 independent VT voltage inputs; CT supports auto selection of 1A or 5A secondary rated current without jumper setting, VT adapts to 100/120V secondary voltage standard for power substation.
Equipped with high linearity 16-bit A/D converter, current measurement accuracy ±1% reading, voltage accuracy ±0.5% reading, support 50/60Hz power frequency synchronous sampling. Each analog channel adopts independent transformer galvanic isolation (2000VAC isolation withstand), effectively eliminate ground loop interference in high EMI substation cabinet.
Unique CT open-circuit detection and VT fuse failure monitoring function: continuously monitor abnormal secondary loop state, record fault time stamp and upload alarm to SCADA/HMI. All signal terminals integrate surge & ESD suppression circuits, wide temperature industrial hardware, widely used in thermal power, hydropower, petrochemical distribution substation main protection cabinets. GE has ceased mass production, only surplus new stock and refurbished spare parts available aftermarket.
2. Complete Technical Specifications
• CT Input Channels: 3 phase CT + 1 ground CT, auto-ranging 1A / 5A secondary
• VT Voltage Inputs: 4 independent VT terminals, rated 100V / 120V AC secondary
• Sampling Converter: 16-bit high linearity synchronous A/D sampling
• Measurement Accuracy: Current ±1% FS, Voltage ±0.5% FS
• Galvanic Isolation: 2000VAC rms channel-to-logic isolation, each channel independent isolating transformer
• Supported Frequency: 50Hz / 60Hz auto-detect power frequency
• Diagnostic Functions: CT open circuit, VT fuse blown, over-range, loop overload fault detection with millisecond timestamp logging
• Surge & ESD Protection: ±15kV contact ESD, 2kV line surge suppression on all CT/VT terminals
• Power Supply: Derived from UR main relay internal 24VDC backplane, max power consumption 5W
• Operating Temperature: -40℃ ~ +70℃ substation cabinet with ventilation
• Storage Temperature: -40℃ ~ +85℃
• Humidity: 5% ~ 95% RH non-condensing
• Mechanical Form: Single-slot internal plug-in card for UR relay chassis, IP20 protection grade
• Weight: ~0.37kg
• Certifications: IEC60255 protection relay standard, CE, UL industrial safety certification
3. Hardware Structure Composition
1. 4 groups of CT isolating transformers (3 phase + ground) with anti-saturation circuit
2. 4 VT voltage isolation & attenuation sampling circuits
3. Multi-channel synchronous 16-bit A/D conversion chip for real-time electrical quantity sampling
4. Front screw terminal block labeled C/T/V for CT/VT field wiring
5. Internal high-speed backplane bus interface for analog raw data upload to main relay CPU
6. Fault monitoring ASIC for CT open / VT fuse loss real-time detection
4. UR8FV vs UR6EV / UR6PH Core Difference
• UR8FV: Analog CT/VT sampling module, collect current/voltage analog signals for protection calculation
• UR6EV: Digital I/O card (8DI+4DO), only switch status & relay control, no analog measurement
• UR6PH: Digital I/O card (4DI+6DO), multi-relay output for trip/alarm control
• All three plug into UR relay internal slots, function types completely independent and complementary
5. Core Power Industry Application Scenarios
• Thermal power plant generator/transformer main protection cabinet: 3-phase current, zero-sequence ground current, bus voltage sampling for overload, differential, earth fault protection
• Petrochemical substation feeder protection: measure line power factor, load, harmonic distortion, supply over/under voltage fault criteria
• Hydropower unit relay protection system: stator current, bus voltage synchronous sampling for loss-of-field, reverse power protection
• Urban distribution intelligent substation UR relay analog quantity expansion, high-precision telemetry data upload to SCADA
GE Grid Solutions © UR8FV CT/VT Analog Sensing Module For UR Series Protection Relays