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- UR 8HH
- Current Transformer/Voltage Transformer Module
- USA
- 120 × 30 × 100 mm
- 2.27 kg
- Xiamen, China
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Product Overview
The GE UR 8HH Multilin UR Series Current Transformer/Voltage Transformer Module is associated with the GE Multilin Universal Relays (UR) product family, which is used in electrical protection, control, measurement, and monitoring applications. Current and voltage measurement circuits form a key part of these installations, allowing protective relays to assess electrical conditions and respond according to the configured protection scheme.
Current transformers (CTs) convert primary circuit current into secondary signals suitable for measurement equipment, while voltage transformers (VTs) provide corresponding voltage signals. These signals can be used by compatible protection equipment to monitor feeder loading, detect abnormal electrical conditions, supervise voltage, and support event analysis. The specific functions available depend on the connected relay, the hardware configuration, and the protection settings.
In an installed protection panel, the UR 8HH must be identified by its complete model designation and checked against the applicable equipment documentation. Similar-looking components within the UR Series may have different input characteristics, terminal assignments, or application requirements. Confirming the exact module identity before installation or replacement helps avoid wiring errors and prevents an unverified component from being introduced into an existing protection circuit.
For maintenance teams, the most useful starting point is the installed system’s wiring diagram, relay configuration record, and equipment nameplate. These records establish how the module is used in the actual installation and provide the information needed to verify electrical connections, measurement scaling, and replacement suitability.
Technical Specifications
| Parameter | Specification |
|---|---|
| Brand | GE |
| Model | UR 8HH |
| Product Family | Multilin UR Series |
| Product Type | Current Transformer/Voltage Transformer Module |
| Product Category | Electrical measurement and protection-system hardware |
| Primary Application | Current and voltage measurement within a compatible protection system |
| Measurement Circuit Types | Current transformer and voltage transformer circuits, subject to the documented configuration |
| System Role | Supports the measurement signal path associated with protection and monitoring equipment |
| Typical Installation | Electrical protection panel or compatible control cabinet |
| System Integration | GE Multilin UR Series; verify the specific supported configuration |
| Electrical Input Ratings | Confirm from the product nameplate and applicable GE documentation |
| Terminal Configuration | Refer to the model-specific terminal diagram |
| Protection Functions | Depend on the connected relay and its configured functions |
| Dimensions | 120 × 30 × 100 mm |
| Weight | 2.27 kg |
Product Features
- GE Multilin UR Series Association: The UR 8HH belongs to the Multilin UR Series product family used in power system protection and monitoring. Its precise position within a particular relay configuration should be verified from the applicable documentation.
- Current and Voltage Measurement Application: CT and VT circuits provide secondary electrical signals that can be used by compatible protective relays to evaluate system operating conditions. Correct signal routing is essential to accurate measurement and protection decisions.
- Support for Electrical Protection Schemes: Current and voltage measurements can contribute to overcurrent, voltage supervision, phase measurement, and other protection functions when those functions are supported by the associated relay and configured for the installation.
- Module-Level Identification: The complete UR 8HH model number provides a specific reference for purchasing, inventory control, maintenance records, and replacement planning. Technicians should verify the entire designation rather than relying on the product family alone.
- Integration With Panel Wiring: The module must be considered alongside the surrounding measurement circuits, terminal blocks, protective devices, and relay connections. Wiring identification and documented terminal assignments are essential during commissioning and service.
- Documentation-Based Configuration: Electrical ratings, connection arrangements, and supported operating conditions should be established from the correct GE documentation. These details should not be inferred from a similar UR Series model.
- Maintenance and Retrofit Planning: Recording the installed module, associated relay, and connected CT/VT circuits helps reduce uncertainty during planned maintenance, troubleshooting, and control-panel modifications.
Working Principle
In a typical electrical protection arrangement, current and voltage transformers provide secondary signals that represent conditions in the primary power circuit. A CT produces a secondary current proportional to primary current according to its transformation ratio. A VT provides a secondary voltage proportional to the primary system voltage. The actual ratios, secondary ratings, and circuit arrangements depend on the instrument transformers selected for the installation.
These secondary signals are routed through the designated measurement circuits to compatible protection equipment. The relay interprets the incoming values, compares them with configured settings, and evaluates whether the electrical system is operating within the required limits. Depending on the relay model and enabled functions, the measurements may contribute to alarm generation, protective tripping, operating records, and post-event analysis.
The UR 8HH is identified as a Multilin UR Series Current Transformer/Voltage Transformer Module. However, the model designation alone does not establish its internal circuitry, exact measurement channels, or supported input ratings. Its precise role in the signal path should therefore be confirmed from the relevant GE technical documentation and the wiring diagram for the installed system.
During commissioning, technicians should verify that the correct CT and VT circuits are connected to the designated terminals, that transformer ratios and phase assignments match the relay configuration, and that measured values are consistent with expected system conditions. Unexpected readings should be investigated before the protection scheme is placed into service.
Role in a GE Multilin UR Series Protection Architecture
| System Element | Function | Integration Considerations |
|---|---|---|
| Primary Power Circuit | Carries the current and voltage monitored by the protection system | Identify the monitored circuit and the boundaries of the protection zone |
| Current Transformers | Convert primary current into secondary measurement signals | Verify ratio, polarity, secondary rating, accuracy requirements, and circuit continuity |
| Voltage Transformers | Provide secondary voltage signals representing primary system voltage | Confirm ratio, phase relationships, fusing, and grounding arrangements |
| GE UR 8HH Module | Identified as a Multilin UR Series Current Transformer/Voltage Transformer Module | Confirm its exact hardware role, terminal assignments, and supported configuration from GE documentation |
| GE Multilin UR Series Relay | Processes supported electrical measurements and executes configured protection functions | Verify relay model, supported measurement inputs, configuration, and enabled protection functions |
| Protection Settings | Define operating thresholds, timing, and decision logic for the selected protection scheme | Use approved settings based on the system design and protection study |
| Alarm and Trip Circuits | Communicate protection decisions to annunciation systems or circuit-breaker control circuits | Check output assignments, interlocks, trip-circuit continuity, and end-to-end operation |
| Engineering Records | Preserve model information, wiring diagrams, settings, and commissioning results | Keep documentation consistent with the installed equipment and approved changes |
The UR 8HH should be assessed as part of the complete measurement and protection architecture. The integrity of the system depends on correct instrument-transformer connections, suitable measurement inputs, accurate configuration, and the proper operation of downstream alarm and trip circuits. The exact relationship between the UR 8HH and a specific UR Series relay must be confirmed before selecting or installing the module.
Industrial Applications
| Application | Measurement and Protection Role | Practical Considerations |
|---|---|---|
| Electrical Substations | CT/VT measurement supports protective relays monitoring feeders, transformers, and other power equipment | Verify phase identification, transformer ratios, polarity, and approved wiring diagrams |
| Industrial Distribution Networks | Provides the measurement context required for electrical supervision and protection | Confirm that the measurement circuit corresponds to the intended feeder or bus section |
| Motor Protection Systems | Current and voltage signals can support motor-related protection functions where available in the connected relay | Verify relay capabilities, motor data, and the protection settings used in the installation |
| Transformer Protection | Electrical measurements can contribute to transformer protection schemes supported by the associated equipment | Confirm the intended protection method and all required measurement inputs |
| Generator Protection | Supports electrical measurement arrangements used for generator supervision and protection | Check the relay’s supported functions and the generator-specific protection design |
| Switchgear Protection | Measurement signals help the protection system evaluate operating conditions in switchgear circuits | Confirm circuit assignments and verify the complete trip path |
| Process and Manufacturing Plants | Supports electrical protection arrangements serving production equipment and critical loads | Maintain clear circuit identification and coordinate wiring with plant documentation |
| Retrofit and Replacement Projects | Provides a model reference for identifying existing measurement hardware during maintenance | Verify the complete part number and documented compatibility before substitution |
These applications represent common uses of CT/VT measurement in industrial power systems. They do not establish that every listed protection function is implemented directly by the UR 8HH. Actual functionality depends on the module’s documented role, the associated relay, and the configuration of the installed protection system.
Installation and Maintenance
- Verify the Product Identification. Check the equipment label for the complete UR 8HH model designation before installation or replacement. Compare the label with the bill of materials, maintenance records, and panel drawings to avoid confusing it with another UR Series component.
- Review the Correct Technical Documentation. Obtain the applicable GE Multilin documentation, wiring diagram, and terminal information for the installed hardware. Do not rely on the specifications of a similar model when determining electrical ratings or connection assignments.
- Follow Electrical Isolation Procedures. Apply the site’s approved lockout/tagout and electrical isolation procedures before working on the equipment. Verify the relevant circuit conditions using appropriate methods and equipment before touching conductors or terminals.
- Protect CT Secondary Circuits. Never open an energized current-transformer secondary circuit unless the approved procedure and suitable shorting arrangements explicitly permit the work. An open CT secondary can generate dangerous voltage. Follow the established site procedure before disconnecting, testing, or reconnecting CT wiring.
- Inspect the Mounting Arrangement. Confirm that the intended installation position matches the panel drawings and allows sufficient access for wiring inspection and maintenance. Check the mounting hardware and surrounding equipment for signs of damage or interference.
- Record Existing Wiring. Before removing an installed module, label each conductor and record the terminal position. Compare the wiring with the latest approved schematic and preserve enough information to restore the original measurement circuit correctly.
- Check CT and VT Connections. Verify that current and voltage circuits are connected to their designated terminals. Confirm CT polarity, VT phase sequence, transformer ratios, and specified grounding arrangements against the approved protection design.
- Inspect Terminals and Conductors. Check for loose connections, corrosion, damaged insulation, contamination, and overheating. Use the conductor preparation, terminal tightening, and wiring methods specified for the actual equipment.
- Confirm Electrical Ratings. Review the nameplate and model-specific documentation for applicable input, insulation, and operating requirements. Do not connect measurement circuits or apply test signals until the suitability of the electrical ratings has been established.
- Carry Out Commissioning Checks. Perform the required continuity, polarity, ratio, phase, and measurement checks in accordance with the approved procedure. Compare relay readings with expected values and investigate discrepancies before enabling the protection scheme.
- Update Maintenance Documentation. Record the module designation, wiring changes, test results, and relevant configuration updates. Revise drawings and equipment records whenever an authorized change affects the measurement or protection circuit.
- Include the Module in Routine Inspection. During scheduled maintenance, examine the physical condition, terminal security, wiring integrity, and consistency of measurement readings. Follow the manufacturer’s maintenance recommendations and site inspection intervals, and investigate abnormal readings rather than relying on visual inspection alone.
Compatible System Components
| Component | Function in the System | Compatibility Considerations |
|---|---|---|
| GE Multilin UR Series Protective Relay | Processes supported electrical measurements and applies configured protection logic | Confirm the exact relay model and documented compatibility with the UR 8HH |
| Current Transformer (CT) | Supplies a secondary current signal representing primary circuit current | Match the ratio, secondary rating, polarity, accuracy, and burden requirements to the protection design |
| Voltage Transformer (VT) | Supplies a secondary voltage signal representing primary system voltage | Verify voltage ratio, phase relationship, insulation rating, and secondary protection |
| CT Shorting Terminal Block | Provides a controlled method for shorting CT secondary circuits during approved maintenance procedures | Confirm the device ratings and follow the site’s CT shorting procedure |
| VT Secondary Protection | Provides the specified protection for voltage measurement wiring | Select the appropriate fuse or protective arrangement according to the approved schematic |
| Relay Control Power Supply | Powers the associated protective relay where required | Confirm the relay’s permitted supply range and connection requirements |
| Trip Relay or Output Circuit | Transfers protection decisions to a circuit-breaker trip circuit or other control function | Verify output ratings, contact assignments, interlocks, and trip-circuit continuity |
| Panel Terminal Blocks | Organize field wiring and measurement connections | Check terminal ratings, conductor requirements, identification, and circuit segregation |
| Engineering Configuration Tools | Support configuration and maintenance of compatible UR Series equipment where applicable | Confirm tool support for the exact relay model and configuration version |
| Protection Panel Drawings | Define measurement wiring, terminal assignments, and the overall protection arrangement | Use the latest approved drawings and document all authorized modifications |
The components listed are typical elements of an electrical protection installation, not a manufacturer-certified compatibility list for the UR 8HH. Confirm the specific supported arrangement, electrical ratings, and terminal connections from the applicable GE documentation before procurement or installation.
Recommended Related Models
| Model or Product Family | Product Role | Relationship to the UR 8HH |
|---|---|---|
| GE Multilin UR Series Protection Relays | Electrical protection, control, and monitoring | Relevant when identifying the relay associated with the installed measurement hardware |
| GE Multilin UR Series Current Measurement Hardware | Supports current measurement in applicable protection configurations | Consider only after confirming the required input characteristics and documented hardware arrangement |
| GE Multilin UR Series Voltage Measurement Hardware | Supports voltage measurement in applicable protection configurations | Verify the voltage input requirements and supported configuration before selection |
| GE Multilin UR Series Feeder Protection Equipment | Supports feeder protection where the selected relay provides the required functions | Relevant to distribution circuits monitored through CT/VT measurement |
| GE Multilin UR Series Motor Protection Equipment | Supports motor protection where the selected relay provides the required functions | Relevant when the application involves motor current and voltage monitoring |
| GE Multilin UR Series Transformer Protection Equipment | Supports transformer protection in applicable configurations | Confirm the protection scheme and measurement requirements before selecting related hardware |
These are related product families and application categories rather than confirmed direct replacements for the UR 8HH. A replacement must be evaluated against the full model designation, documented function, electrical ratings, terminal arrangement, and system requirements. A shared UR Series designation alone does not establish interchangeability.
Key Advantages
- Specific Product Identification: The UR 8HH model designation supports equipment tracking, inventory management, purchasing, and maintenance documentation.
- Association With the Multilin UR Platform: The module belongs to a product family used in electrical protection and monitoring installations.
- Support for Measurement-Circuit Maintenance: Correct identification and wiring records help technicians trace CT/VT signal paths and investigate measurement discrepancies.
- Useful for Retrofit Work: Confirming the installed model and its connections supports more controlled planning for panel maintenance and equipment replacement.
- Documentation-Led Commissioning: Verification of ratings, terminal assignments, transformer ratios, and relay configuration helps reduce installation errors and supports protection-system integrity.
Technical FAQs
1. What is the GE UR 8HH Multilin UR Series module?
The GE UR 8HH is identified as a Multilin UR Series Current Transformer/Voltage Transformer Module. Its exact internal function, electrical characteristics, and supported connection arrangement should be verified using the equipment nameplate and applicable GE documentation.
2. Is the UR 8HH compatible with all GE Multilin UR Series relays?
Compatibility should not be assumed across the entire UR Series family. Check the specific relay model, supported hardware configuration, electrical input requirements, and the manufacturer’s documented relationship with the UR 8HH before installation.
3. What should be verified before replacing a UR 8HH?
Confirm the complete model designation, terminal diagram, existing wiring, CT and VT circuit assignments, electrical ratings, and associated relay configuration. Follow the approved electrical isolation procedure and take particular care with CT secondary circuits, which can develop dangerous voltage if opened while energized.
4. What maintenance checks are appropriate for a UR 8HH installation?
Inspect the physical condition, terminals, wiring, and associated measurement circuits. Verify CT polarity, VT phase relationships, transformer ratios, and relay readings according to the approved commissioning or maintenance procedure. If measurements are abnormal, compare the installation with the correct wiring diagram and consult the applicable GE technical documentation.