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Medium Voltage Phasing Comparator

MV Phasing Comparator Data Sheet
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The MV Phasing Comparator is used to verify phase matching and phase rotation on energized medium-voltage networks before making a connection, closing a breaker, or transferring load. It provides a clear indication when two points are either in-phase (safe to connect) or out-of-phase (hazardous) — helping prevent equipment damage, flashover, and backfeed incidents during switching.

Key Features

  • Designed for live-line phase comparison on MV networks

  • Clear in-phase / out-of-phase visual indication

  • Lightweight, insulated design for comfortable field use

  • Allows safe confirmation before breaker closing or switching

  • Helps prevent fault backfeed, transformer damage & arc risk

  • Suitable for substations, line maintenance & ring feed systems

  • Works on overhead lines, transformer bushings & switchgear

Technical Specifications

Parameter Value
Rated Operating Voltage Medium Voltage (model dependent)
Function Phase comparison & rotation verification
Indication Visual phase match / mismatch indication
Construction Fully insulated live-line rated operating rods
Application Energized overhead lines & substation equipment
Safety Standard Designed to meet utility live-line work practices

Applications in the Field

  • Confirming phase before jumpering or paralleling feeders

  • Ensuring correct phase rotation before motor or pump energizing

  • Checking transformer primary vs secondary phasing

  • Verifying phases during ring feed switching

  • Safe line identification during fault restoration

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