Specifications

P.56
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Wardson Limited
Unit A & B, 21/F., Infotech Centre, No. 21 Hung To Road Kwun Tong, Kowloon, Hong Kong. Web: www.wardsonlimited.com
Tel: [phone] Fax: [phone] E-mail: [e-mail]
Model
Part # Description
RMO20T non
Winding OhmMeter
RMO20T
High DC current reslstance meter for Transformers/motors
Winding OhmMeter
Description
Typical application
Typical application of RMO10T is measuring the resistance of:
n Power transformers
n On-Load Tap Changers
n Generators and electrical motors
n High-current busbar joints
n Cable splices
Description
The ohmmeter RMO20T is designed for resistance measurement of inductive test objects.
RMO20T generates true, filtered DC current. Both injection of current and discharge of
energy from the inductance are automatically regulated.
RMO20T 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 RMO20T instrument to store 500 measurements.
All measurements are time and date stamped.
The set is equipped with thermal and overcurrent protection. The RMO20T has very high
ability to cancel electrostatic and electromagnetic interference in HV electric fields. It is
achieved by very efficient filtration. The filtration is made utilizing appropriate hardware
and software.
On Load Tap Changers
The RMO20T can be used to measure winding resistance of individual taps of a power
transformer's tap changer. It can also check whether the on-load tap changer (OLTC)
switches without an interruption. The moment a tap position is changed from one tap to
another, the device detects a sudden, very short drop of the current. A properly working
tap changer differs from a malfunctioning one. This is obvious from an interruption during
the change, and by the magnitude of the ripple. An interruption will result in much higher
ripple value than a properly functioning tap changer that operates without interruption.
RMOWin-T
Using RMOWin-T software, tests could be performed from a PC, and results can be
obtained directly at a PC. Utilizing RMOWin-T software, results can be arranged in an
Excel spreadsheet, which can be shown later as a diagram and printed for a report.
DV-POWER
Features
n Lightweight - only 7,5kg
n Test current 5mA - 20A DC
n Measuring range 0,1 - 2k
n Two voltage sense channels
n Extremely quick measurement
n Automatic discharge circuit