Automatic resistance measurement for the Heat Run test
Rapid automatic demagnetization
Automatic discharge circuit
Resistance measurement of transformers, rotary machines
Four models: RMO10TW, RMO20TW, RMO30TW, RMO50TW
Three-channel winding resistance measurement, which enables simultaneous winding resistance measurement of up to three windings on a single phase
Detection of interruptions during the operation of on-load tap changers (OLTC), performed on a single phase
Heat Run test, which enables obtaining the Hot Spot temperature along with resistance graph during the cooling process
The Winding Ohmmeter of the RMO-TW series is designed for winding resistance measurement of inductive objects.
The RMO-TW instrument is based on the state of the art technology, using the most advanced switch mode technology available today. The RMO-TW instrument is accurate (0,1%), powerful (up to 50 A) and lightweight.
It generates a true DC ripple free current with automatically regulated measurement and discharging circuit.
RMO-TW instrument can perform a simple, quick and reliable transformer on-load tap changer verification.
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. The results are displayed on a backlit LCD display.
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.
The standard interface is USB. RS232 is optional.
Winding Resistance Measurement:
5 mA – 10 A DC for RMO10TW
5 mA – 20 A DC for RMO20TW
5 mA – 30 A DC for RMO30TW
5 mA – 50 A DC for RMO50TW
Output voltage: up to 55 V DC
Measurement range: 0,1 μΩ - 10 kΩ
±(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
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
Paper width 80 mm
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 tool
Please feel free to contact for detailed specifications, accessories, software and options.