On-load tap changer dynamic resistance measurement
Three resistance measurement channels
Four temperature measurement channels
Vibration measurement
Automatic resistance/temperature measurement for the Heat Run test
Rapid automatic demagnetization
Tap changer motor current monitoring channel
Automatic discharge circuit
Three models: RMO40TT, RMO60TT, RMO100TT
Application:
Three-channel winding resistance measurement, which enables simultaneous winding resistance measurement of up to three windings on a single phase
Dynamic resistance measurement (DVtest) of on-load tap changers, performed on a single phase
A measurement of on-load tap changer motor current by using a dedicated channel
Measurement of on-load tap changer external tank vibrations using an accelerometer
Heat Run test, which enables obtaining the Hot Spot temperature along with temperature/resistance graph during the cooling process
A single-phase automatic transformer demagnetization
System Overview:
The Tap Changer Analyzer & Winding Ohmmeter of the RMO-TT series is designed for winding resistance measurement of inductive objects, and for a tap changer analysis.
The RMO-TT instruments are accurate (0,1%), powerful (up to 100 A) and still portable.
The Instruments generate a true DC ripple free current with automatically regulated measurement and discharging circuit.
RMO-TT instruments can perform a simple, quick and reliable transformer on-load tap changer condition assessment.
This series of instruments enable 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.
DV-Win software:
The DV-Win application 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.