GE UR-8LH Protection Relay

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                                                                              • • • • • • • • • • • • • • • • • • • • • • GE UR-8LH Protection Relay (Universal Relay CT/VT Module)

                                                                                                                          

                                                                                                                           

                                                                                                                          The GE UR-8LH is a CT/VT input module used inside GE Multilin Universal Relay (UR) systems. It is not a standalone protection relay, but a signal acquisition module that provides current and voltage inputs to the main UR relay CPU.

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                                                                                                                          Key Specifications

                                                                                                                          • Model: UR-8LH
                                                                                                                          • Brand: GE Multilin (GE Vernova)
                                                                                                                          • Series: Universal Relay (UR)
                                                                                                                          • Product Type: CT/VT Module (Input Module)
                                                                                                                          • Function:
                                                                                                                            • Measures 3-phase current (CT inputs)
                                                                                                                            • Measures voltage inputs (VT inputs)
                                                                                                                            • Sends signals to relay processor for protection logic
                                                                                                                          • Configuration (typical):
                                                                                                                            • 4 CT + 4 VT channels
                                                                                                                          • Installation:
                                                                                                                            • Plug-in module inside UR relay chassis
                                                                                                                          • Communication:
                                                                                                                            • Backplane communication with UR CPU module

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                                                                                                                          What it actually does

                                                                                                                          This module is responsible for signal measurement only:

                                                                                                                          CT / VT (field signals)
                                                                                                                          ↓
                                                                                                                          UR-8LH Module (measurement & conditioning)
                                                                                                                          ↓
                                                                                                                          UR Relay Processor (protection logic)
                                                                                                                          ↓
                                                                                                                          Trip / Alarm outputs

                                                                                                                          So:

                                                                                                                          • ❌ Not a protection relay CPU
                                                                                                                          • ❌ Not a standalone controller
                                                                                                                          • ❌ Not a PLC module
                                                                                                                          • ✔ It is a measurement input module for UR relay systems

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                                                                                                                          Features & Advantages

                                                                                                                          • High-accuracy current and voltage acquisition
                                                                                                                          • Supports 3-phase power system monitoring
                                                                                                                          • Modular plug-in design for UR platform
                                                                                                                          • Enhanced diagnostic capability (signal validation)
                                                                                                                          • Supports multiple UR relay configurations
                                                                                                                          • Used in high-reliability substation protection systems

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                                                                                                                          Applications

                                                                                                                          • Power transmission substations
                                                                                                                          • Feeder protection systems
                                                                                                                          • Transformer protection systems
                                                                                                                          • Generator protection systems
                                                                                                                          • Industrial electrical distribution
                                                                                                                          • Utility grid protection systems 

The structure and details of the product：