GE Multilin UR-8LV UR Series CT/VT Module

Description

The GE Multilin UR-8LV operates as a high-reliability analog instrumentation component within the Universal Relay (UR) protection and control platform. Designed specifically as a replacement card for vertical hardware frames, this CT/VT Module handles precision simultaneous acquisition of both current and voltage metrics from major power system lines. The hardware is defined by a Standard 4CT/4VT with enhanced diagnostics layout, integrating four current transformer (CT) channels and four voltage transformer (VT) channels onto a unified circuit assembly. This enables the parent relay to continuously analyze three-phase power variables plus an additional auxiliary channel for neutral or zero-sequence parameter tracking. Engineered to cooperate directly with an enhanced front panel with Chinese display and user-programmable pushbuttons, the UR-8LV feeds vital electrical network samples to the CPU for localized protection logic execution, comprehensive power metering, true RMS evaluation, and active waveform event monitoring in regions utilizing Chinese-localized interface architectures.

Features

• Integrates a balanced 4CT (Current Transformer) and 4VT (Voltage Transformer) channel design within a single, full-height slot footprint.
• Implements enhanced internal hardware diagnostics to continuously verify signal cross-checks and analog-to-digital converter path health.
• Built to interface seamlessly with specialized UR front-panel variants featuring native Chinese character displays.
• Supports high-fidelity continuous sampling of alternating current and AC voltage waveforms for localized relay intelligence.
• Equipped with mechanical internal CT shorting bars that lock closed automatically to secure field loops upon card extraction.
• Manufactured specifically to comply with the alignment tracks of vertical orientation rack configurations.

Applications

• Three-phase feeder protection paired with zero-sequence or residual voltage/current monitoring.
• Main-tie-main and bus-coupler protective relaying in localized industrial sub-distribution plants.
• Substation automation nodes requiring localized Chinese text interfaces and manual command pushbuttons.
• Core instrumentation tracking for multi-zone voltage stability and overcurrent coordination.

Ordering Information

Technical Specifications

Connections/Interfaces

The rear terminal terminal map of the UR Series relies on a coordinate-based indexing scheme corresponding directly to the slot position where the UR-8LV card is installed.

• CT Terminal Blocks: Rigid heavy-duty barrier terminals integrated with automatic, physical spring-loaded shorting bars to handle continuous current feedback.
• VT Terminal Blocks: High-dielectric isolation voltage ports dedicated to receiving secondary potential utility instrumentation lines.

Installation Guidelines

• De-energization Rule: Ensure that all primary control power supplied to the UR chassis is fully isolated and switched off before sliding out or inserting any sub-assembly.
• ESD Mitigation: Technicians must wear a grounded anti-static wrist strap throughout the installation or maintenance cycle to prevent static discharges into the microprocessors.
• Card Insertion: Slide the card evenly into the physical track of the vertical rack slot until the inner backplane connectors engage, then lock the upper and lower faceplate latch mechanisms simultaneously to ensure a uniform connection.
• Display Verification: Following system power-up, cross-check the front-panel localized display module to ensure that the newly updated analog channel arrays align correctly with the localized menu logic.