DV Power RMO40T - DV Power RMO40T Winding Resistance OhmMeter on MyMeterStore.com

The ohmmeter RMO40T is designed for resistance measurement of inductive test objects. RMO40T generates true, filtered DC current. Both injection of current and discharge of energy from the inductance is automatically regulated.

RMO40T injects current with a voltage as high as 60V. This ensures that the duration of test is as short as possible, and that the desired test current is reached as soon as possible. Two independent channels enable testing of two series windings, or primary and secondary windings. There is enough memory within RMO40T instrument to store 100 measurements. All measurements are time and date stamped.

The set is equipped with thermal and overcurrent protection. The RMO40T has very high ability to cancel electrostatic and electromagnetic interference in high HV electric fields. It is achieved byvery efficient filtration. The filtration is made utilizing appropriate hardware and software.

On Load Tap Changers

RMO40T can measure the winding resistance of the individual taps of a power transformer�s tap changer, and can check whether the on-load tap changer (OLTC) switches without an interruption.

In the moment the tap is changed from tap to tap, the device detects the sudden, very short drop of the current flow. A properly working of tap changer differs from a malfunctioning one, e.g., an interruption during the change, by the magnitude of the ripple and slope values. An interruption will result in much higher ripple and slope values than a properly functioning of tap changer.

RWOWin-T

Using RMOWin-T software a test can be operated from PC, and the results can be obtained directly in PC. Using RWOWin-T the result can be printed like an Excel table which later can be shown as a diagram and used for a report. Also, the diagram of the current during the on-load tap changer test can be obtained using RMOWin-T software.

Typical application of RMO40T is measuring the resistance of:

Power transformers
On-Load Tap Changers
Generators and electrical motors
High-current busbar joints
Cable splices

More Information

See the DV Power RMO40T Brochure