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GE UR8LH CT/VT Module with Enhanced Diagnostics 3-1A/5A Phase CT and 4x50-240V VT Inputs
GE UR8LH CT/VT Module with Enhanced Diagnostics 3-1A/5A Phase CT and 4x50-240V VT Inputs
Enhanced Diagnostics CT/VT Module
3-1A/5A Phase CT UR8LH Module
4x50-240V VT Inputs GE UR8LH
Place of Origin:
USA
Brand Name:
General Electric
Model Number:
UR8LH
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Product Details
PHASE CTS:
3-1AMP / 5AMP
GROUND CT:
1-1AMP / 5AMP
VTS:
3PH 1AUX / 50-24V
Product Model:
UR8LH
Product Parameters:
CT/VT Module
Country Of Origin:
USA
Place Of Shipment:
Xiamen, China
Manufacturer:
General Electric
Highlight:
Enhanced Diagnostics CT/VT Module
,3-1A/5A Phase CT UR8LH Module
,4x50-240V VT Inputs GE UR8LH
Payment & Shipping Terms
Minimum Order Quantity
1
Price
66USD
Packaging Details
Brand new and original
Delivery Time
2-3 work days
Payment Terms
T/T
Supply Ability
in stock
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Product Description
Estimated Shipping Size: 4×18.5×17.2 cm
Weight: 1.2 kg
Phase CT Inputs: 3 × 1 A or 5 A
VT Inputs: 4 × 50 - 240 V AC
Isolation: 2.5 kV RMS between
Operating Temperature: -40°C to +70°C (industrial rating)
Storage Temperature: -40°C to +85°C
Humidity: 5% to 95% RH (non-condensing)
The performance of microprocessor-based relays depends critically on the accuracy and availability of analog channel measurements, as protection functions operate directly on these values. Any failure within an analog measurement channel may result in incorrect protection operation.
The GE UR8LH CT/VT Module is part of the UR CT/VT modules with Enhanced Diagnostics (module types 8L, 8M, 8N, 8R, 8S, and 8V). These modules are capable of detecting failures in analog channel measurements caused by internal CT/VT module faults.
When an internal failure is detected, the module generates an alarm indicating CT/VT module failure and automatically blocks tripping from any protection function associated with the affected module. This diagnostic capability helps prevent incorrect relay operation and enhances overall system reliability.
Enhanced Diagnostics functionality is available when the UR relay is operating with firmware version 5.20 or later.
Why is analog channel integrity the primary variable for protection reliability?
Microprocessor-based relays execute protection algorithms directly against digitized analog values. A deviation or corruption in the analog measurement channel—without diagnostic oversight—translates directly into erroneous protection logic and potential spurious tripping.
Which specific hardware iterations support the Enhanced Diagnostics protocol?
The functionality is embedded in the UR CT/VT module series with Enhanced Diagnostics. This specifically encompasses module types 8L (UR8LH), 8M, 8N, 8R, 8S, and 8V. Standard legacy modules do not possess this architecture.
What is the specific trigger for the diagnostic alarm?
The system monitors for internal CT/VT module faults. It isolates failures specifically located within the module's analog circuitry, distinguishing internal hardware degradation from external system grid events.
Execute Sequence: What occurs immediately upon positive fault detection?
The relay initiates a dual-stage response:
1. Alarm Generation: Flags a "CT/VT module failure" event.
2. Trip Blocking: Automatically inhibits the trip output for any protection function mapped to the compromised module to prevent maloperation.
1. Alarm Generation: Flags a "CT/VT module failure" event.
2. Trip Blocking: Automatically inhibits the trip output for any protection function mapped to the compromised module to prevent maloperation.
Is this hardware backward compatible with pre-5.x firmware kernels?
Negative. The Enhanced Diagnostics logic requires UR Firmware Version 5.20 or later to correctly interface with the module's hardware status registers and execute the blocking logic.
How does this feature alter the Security vs. Dependability equation?
It significantly biases the system towards Security. By identifying invalid analog data at the source (the internal AD conversion/signal path), it prevents the relay from acting on false positives, thereby maintaining overall grid stability.
Does the UR8LH monitor external instrument transformer (IT) health?
Distinction required: The Enhanced Diagnostics focus strictly on the relay's internal analog measurement channels. While it ensures the relay is healthy, it is distinct from algorithms designed to detect VT fuse loss or open CT circuits in the switchyard.
Is user intervention required to block the trip during a failure event?
No. The blocking mechanism is autonomous. Once the internal diagnostic threshold is breached, the module self-protects the system by disabling associated tripping functions without operator latency.
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