The controer Analyzer & Winding Ohmmeter of the RMO-TD series is designed for winding resistance measurement of inductive objects, and for a tap changer analysis. The RMO-TD series is based on the state of the art technology, using the most advanced switch mode technology available today. The RMO-TD series is accurate (0,1_%), powerful (up to 60 A) and lightweight. It generates a true DC ripple free current with automatically regulated measure-ment and discharging circuit.
RMO-TD series can perform a simple, quick and reliable transformer on-load tap changer condition assessment. This series enables measurements of a winding resistance in every tap position, current ripple values (percentage of a current drop during a tap change) and transition times during the tap changes. Problems with a connection, contacts, and selector/diverter switch operation (tap change with interruption) can be detected with these measurements.
On-load tap changer dynamic resistance measurement
Three resistance measurement channels
One temperature measurement channel
Automatic resistance measurement
Heat Run test
Rapid automatic demagnetization
Tap changer motor current monitoring channel
Automatic discharge circuit
Built-in tap changer control unit
Three models: RMO25TD, RMO40TD, RMO60TD
Winding Resistance Measurement
Test currents:
5 mA – 25 A DC for RMO25TD
5 mA – 40 A DC for RMO40TD
5 mA – 60 A DC for RMO60TD
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 - 10 kΩ range
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
Data Storage
1 000 internal memory positions
USB flash drive feature enables storage of a huge number of measurements
Printer (optional)
Thermal printer
Paper width 80 mm
Temperature Measurement
One temperature measurement channel Thermometer Pt100
-50 ºC +180 ºC / -58 ºF +356 ºF
50 mm x 6 mm
OLTC Dynamic Resistance Measurement
Sampling rate: 0,1 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 tool
AC Current Measurement Channel
Resolution: 0,1 ms
Amplitude resolution: 16 bit
Current Clamp Meter Specifications
Measuring range: 30 / 300 A
Nominal current: 300 ARMS or 450 A DCPK
Frequency range: DC to 20 kHz (-3 dB)
Computer Interface
USB
Optional: RS232
Warranty ：Three years
Environmental Conditions
Operating temperature: - 10 ºC to + 55 ºC / + 14 ºF to + 131 ºF
Storage & transportation: - 40 ºC to + 70 ºC / - 40 ºF to + 158 ºF
Humidity 5 % - 95 % relative humidity, non condensing
Dimensions and Weights
Device Weight Dimensions (WxHxD)
RMO25TD 10,0 kg / 22,0 lbs 480 x 197 x 395 mm (18.9 x 7.75 x 15.6 in)
RMO40TD 13.5 kg / 29.8 lbs 480 x 197 x 395 mm (18.9 x 7.75 x 15.6 in )
RMO60TD 14,0 kg / 30.8 lbs 480 x 197 x 395 mm (18.9 x 7.75 x 15.6 in)
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: 1 800 VA
Fuse 15 A / 250 V, type F, not user replaceable
Applicable Standards
Installation/overvoltage: category II
Pollution: degree 2
Low voltage directive: Directive 2014/35/EU (CE conform); Applicable standards, for a class I instrument, pollution degree 2, installation category II: IEC EN61010-1
EMC: Directive 2014/30/EU (CE Conform) Applicable standard EN 61326-1
Safety: CAN/CSA-C22.2 No. 61010-1, 2nd edition, including Amendment 1
