ALSTOM MVTU11K1CD0751G | VT Voltage Transformer Supervision Midos Draw-out Relay Low-Burden 110VDC - Field Service Notes

ALSTOM MVTU11K1CD0751G | VT Voltage Transformer Supervision Midos Draw-out Relay Low-Burden 110VDC – Field Service Notes

Component Snapshot At-a-Glance

Model: MVTU11K1CD0751G
Alt. P/N: MVTU11B1CD0751G (medium-burden coil variant, higher DC draw); MVAW11 (standalone over/undervoltage, no VT fault discrimination); MCGG series (current-only, no voltage circuit supervision)
Product Series: MVTU Midos static VT supervision relay family, shared rack base footprint with MCGG/MVAJ/MVAX/MVTT relays
Hardware Type: Full withdrawable plug-in static voltage transformer monitoring relay, blue aluminum industrial chassis, front adjustable fault detection threshold dial
Key Feature: K-series low-burden 110/125VDC auxiliary coil, negative/zero sequence voltage measurement to distinguish grid faults vs VT secondary open/fuse blow, blocking output for distance protection elements
Primary Field Use: Detect blown VT fuses, broken PT secondary wiring, open VT circuits; send blocking signal to disable distance relays to avoid false zone tripping from missing voltage signals.