Winding Ohmmeter RMO20TW

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Tap Changer Analyzers & Winding Ohmmetrs
Winding Ohmmeter RMO20TW

The Winding Ohmmeter RMO20TW is a portable and lightweight instrument (7,5 kg / 16.5 lbs) designed for the winding resistance measurement of inductive test objects and for on-load tap changer verification. The RMO20TW instrument generates a true DC ripple-free current with automatically regulated measurement and discharging circuit. The injection of current and discharge of energy from the test object are both automatically regulated. The two independent channels enable testing of two windings in series. This instrument enables measurements of a winding resistance in every tap position of an on-load tap changer without discharging between the tests. Problems with switching of the OLTC, such as interruption, can be detected with these measurements.

 

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  • Included accessories
    • Mains power cable
    • Ground (PE) cable
    • USB cable
    • DV-Win software
    Recommended accessories
    • Current cables 2 x 10 m 2,5 mm2(32.8 ft, 13 AWG) and Sense cables 2 x 10 m (32.8 ft) with TTA clamps
    • Sense cables 2 x 10 m (32.8 ft) with TTA clamps
    • Current connection cable 1 x 5 m 6 mm2 (16.4 ft, 9 AWG) with TTA clamps
    • Transport case
    Optional accessories
    • Test shunt 150 A / 150 mV
    • Thermal printer 80 mm (3.15 in) (built-in)
    • Cable bag
    • Device bag
    • Current cables 2 x 15 m 2,5 mm2(49.2 ft, 13 AWG) and Sense cables 2 x 15 m (49.2 ft) with TTA clamps
    • Current cables 2 x 20 m 2,5 mm2(65.6 ft, 13 AWG) and Sense cables 2 x 20 m (65.6 ft) with TTA clamps
    • Bluetooth communication module

  • Winding Resistance Measurement
    • Test currents: 5 mA – 20 A DC
    • Output voltage: up to 55 V DC
    • Measurement range: 0,1 μΩ – 10 kΩ
    • Typical accuracy:
      ± (0,1% rdg + 0,1% F.S.) for
      0,1 μΩ – 1,999 kΩ range
      ± (0,2% rdg + 0,1% F.S.) for
      2 kΩ – 9,999 kΩ range

     

    Data Storage
    • 1000 internal memory positions

    Warranty
    • Three years

    Printer (optional)
    • Thermal printer
    • Paper width 80 mm

     

    Mains Power Supply
    • Connection according to IEC/EN60320-1;
      UL498, CSA 22.2
    • Mains supply: 90 V – 264 V AC
    • Frequency: 50/60 Hz
    • Mains supply voltage fluctuations
      up to ±10 % of the nominal voltage
    • Input power: 1500 VA
    • Fuse 15 A / 250 V, type F, not user replaceable

    Environmental conditions
    • Operating temperature:
      -10 ºC – + 55 ºC / 14 F – +131 F
    • Storage & transportation:
      -40 ºC – + 70ºC / -40 F – +158 F
    • Humidity 5 % – 95 % relative humidity, non condensing

     

    Resolution
    • 0,1 μΩ – 999,9 μΩ: 0,1 μΩ
    • 1,000 mΩ – 9,999 mΩ: 1 μΩ
    • 10,00 mΩ – 99,99 mΩ: 10 μΩ
    • 100,0 mΩ – 999,9 mΩ: 0,1 mΩ
    • 1,000 Ω – 9,999 Ω: 1 mΩ
    • 10,00 Ω – 99,99 Ω: 10 mΩ
    • 100,0 Ω – 999,9 Ω: 0,1 Ω
    • 1,000 kΩ – 9,999 kΩ: 1 Ω

     

    OLTC Dynamic Resistance Measurement
    • Sampling rate: 4 ms
    • Automatic open circuit detection and warning
    • Transition current ripple measurement
    • Transition time measurement using DV-Win software
    • Timing measurement of different transition changes using DV-Win graph analysis tools

    Computer Interface
    • USB
    • Optional: RS232

     

    Dimensions and Weight
    • Dimensions: 198 mm x 255 mm x 380 mm
      7.8 in x 10.0 in x 15.0 in
    • Weight: 7,5 kg / 16.5 lbs

     

    Safety
    • Low Voltage Directive 2014/35/EU
      (CE Conform)
    • Applicable standards, for a class I instrument,  pollution degree 2,
      Installation category II : IEC EN 61010-1
    • CAN/CSA-C22.2 No. 61010-1

    Electromagnetic Compatibility
    • Directive 2014/30/EU (CE Conform)
    • Applicable standard EN 61326-1

    All specifications listed herein are valid at the ambient temperature of + 25 °C (77°F) and with the recommended accessories included.

    Specifications are subject to change without notice.

  • The DV-Win software enables control and observation of the test process, as well as saving and analyzing the results on a PC. It provides a test report, arranged in a selectable form as an Excel spreadsheet, PDF, Word, or ASCII format. The software provides an OLTC (tap changer) condition assessment through analysis of the graphs representing dynamic resistance values during the tap changer transitions.

    Additionally, the DV-Win measures and calculates the OLTC transition time, the ripple and the winding resistance for each tap changing operation.
    The software can also perform the calculations necessary for the “Heat Run” test. All results can be exported in the report format.

    The standard interface is USB. RS232 is optional.

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