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Winding Resistance Meters & Tap Changer Analyzers

About Winding Resistance Meters & Tap Changer Analyzers

 

Winding resistance test of inductive test objects, such as power transformers, is one of the most effective non-intrusive ways of checking its condition. Due to their advanced design, DV Power winding resistance meters provide high test currents (up to 100 A DC) and high accuracy (up to 0.1%) within light and portable test instruments. In addition to winding resistance measurement, it is also possible to perform simple, quick and reliable transformer on-load tap changer condition assessment by recording the test current during tap changer operation, also known as DVtest. Because of that, problems with a tap changer connection, contacts, and switching procedure can be detected.

DV Power winding ohmmeters consist of single-phase RMO-T and three-phase TWA series. Models from the TWA series are designed for six-winding resistance measurement of power and distribution transformers, with only one single-step cable setup. As a result of reducing the total test time, it enables significant saving of time and money.

Typical application areas of these instruments are high-voltage substations and industrial environments. They are intended to measure the resistance of:

  • Transformer windings
  • On-load tap changers
  • Generators
  • Electrical motors
  • High-current bus bar joints
  • Cable splices
  • Welding joints

Series Comparison

Series
Picture
Models
Type
Tap Changer Dynamic Resistance Measurement
Tap Changer Motor Current Measurement
Temperature Channels
Transformer Ohmmeter RMO-TW Isometric View
RMO10TW, RMO20TW, RMO30TW, RMO50TW
Single-Phase
1
RMO-TD Isometric View
RMO25TD, RMO40TD, RMO60TD
Single-Phase
1
Transformer Resistance Meter RMO100TT Isometric View
RMO40TT, RMO60TT, RMO100TT
Single-Phase
4
Winding Resistance Meter TWA
TWA25A, TWA40D
Single-Phase
1