Description
GE Multilin UR8NH / UR-8NH CT/VT Module
Key Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | GE Multilin |
| Model | / UR-8NH |
| Series | Universal Relay |
| Module Type | CT/VT Module |
| Configuration | 8N |
| Standard CT Function | 8 standard CT inputs |
| CT Ratings | 1 A / 5 A configurations |
| Signal Type | CT/VT analog measurement signals |
| Diagnostics | Advanced health diagnostics and analog-data integrity checking |
| Host System | Compatible GE Multilin UR Series relay |
| Configuration Environment | EnerVista UR |
| Dimensions | Approx. 6 × 7 × 1.5 in. |
| Weight | Approx. 1.15 kg |
The belongs to the GE Multilin UR CT/VT module family. The 8N designation identifies the standard 8CT configuration, while the module family incorporates diagnostic mechanisms for monitoring the integrity of analog measurement signals.
The available technical references also identify support for 1 A and 5 A CT configurations. The frequently published dimensions and weight are approximately 6 × 7 × 1.5 inches and 1.15 kg, respectively; these physical figures should still be checked against the actual replacement module when purchasing used equipment.
Product Introduction
The GE Multilin is a CT/VT measurement module used inside compatible Universal Relay protection systems. Its primary job is to bring transformer-derived electrical measurement signals into the relay’s processing architecture so that configured protection, metering, monitoring, and control functions can operate on the measured power-system quantities. The is therefore an input/measurement module rather than a complete protection relay or CPU.
The GE Multilin is particularly relevant to maintenance of installed UR systems where the relay chassis, processor, and protection settings remain serviceable but the CT/VT hardware requires replacement. Its diagnostic capability is important in protection applications because problems in the analog measurement path can affect protection elements that depend on those measurements. GE Multilin’s UR architecture uses modular CT/VT, CPU, power-supply, I/O, and communications hardware, so the complete relay configuration must be checked before approving a replacement.
UR8NH
Application Scenarios & Field Pitfalls — The Engineer’s Perspective
Engineering Pain Point
A CT/VT module failure can look like a protection-setting problem when the actual issue is the analog measurement path. Incorrect CT module selection can also create a hardware-generation mismatch even when the replacement board physically fits the relay chassis. For this reason, should be purchased against the complete UR relay configuration rather than as a generic analog input card.
Typical Applications
- Feeder Protection: Supplies CT measurement signals used by applicable overcurrent, directional, and related protection functions.
- Generator Protection: Provides current measurement inputs for compatible generator protection schemes.
- Motor and Industrial Power Protection: Supports current measurement for applicable UR relay applications.
- Substation Protection and Monitoring: Interfaces transformer-derived measurement signals with the UR relay processing system.
- Legacy Relay Maintenance: Serves as a replacement module for compatible UR installations using the 8N CT configuration.
Technical Pitfalls
- is not a standalone relay. It is a modular CT/VT component that requires a compatible UR relay chassis and CPU/control architecture.
- Do not confuse 8NH with 8CH or 8RH. GE Multilin offers several CT/VT module configurations. The UR-8RH, for example, is associated with sensitive-ground CT functionality, while the 8NH represents the standard 8CT configuration.
- Verify 1 A versus 5 A CT requirements. The installed relay’s transformer secondary configuration must agree with the replacement module and protection-system design.
- Hardware generation matters. A UR CT/VT module should be checked against the relay’s CPU and other installed hardware generations. Physical insertion alone does not establish system compatibility.
- Do not accept unsupported communication specifications. Some secondary listings incorrectly assign Ethernet and Modbus RTU directly to the CT/VT module. Those claims should not be used for engineering decisions.
- Analog integrity diagnostics are significant. The UR CT/VT family uses analog-data integrity checking, and diagnostic conditions can affect protection functions using the affected measurement data.
- Perform secondary-injection testing after replacement. Verify phase currents, polarity, scaling, metering, protection pickup, directional elements where applicable, and trip logic before returning the relay to service.
Related Products
- GE Multilin UR8CH — CT/VT module with a different UR hardware configuration.
- GE Multilin UR8RH — CT/VT module associated with sensitive-ground applications.
- GE Multilin UR8SH — 7CT/1VT CT/VT configuration; not equivalent to the standard 8CT .
- GE Multilin UR8MH — Another UR CT/VT module generation.
- GE Multilin UR8LV — UR Series CT/VT module with different input configuration.
- GE Multilin UR8LM — Related UR CT/VT module.
- GE Multilin UR9AH — UR Series CPU module; processor function rather than CT/VT measurement.
- GE Multilin UR9EH — Later UR CPU module generation; compatibility must be verified.
- GE Multilin UR-RHV — UR power-supply module, functionally different from the .
Procurement Note
For a GE Multilin / UR-8NH replacement, provide the complete UR relay model, existing CT/VT module designation, CPU type, firmware revision, and module label whenever possible. Confirm the required CT secondary rating and compare the hardware generation before installation.
For a protection-system spare, the most useful acceptance test is not simply a power-up check. The replacement should be evaluated for correct CT measurement, channel assignment, metering, diagnostics, protection-element response, and trip logic within the actual UR relay configuration.
