WRT-10 – Winding Resistance Tester

Transformer Testing – Current Transformers

Part number: 205

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  • Rugged, highly regulated and filtered output current source for fast stabilized measurements even on very large power transformers
  • High Accuracy 0.25 % of rdg
  • High resolution with 4 _ display, 0.1 µΩ
  • Large, Color LCD display
  • Full QWERTY keyboard for easy onsite data entry.
  • Large internal memory
  • Results for each transformer are stored in a file along with the serial number and other details
  • Reporting software automatically generates a finished report from PC
  • Built-in thermal Printer
  • Automatic or Manual Remote Tap Changer circuit
  • Stabilized reading indicator
  • Protection against overvoltageTransients
  • Filtered Input channels eliminating substation noises influence
  • Timed mode for logging heat run testing
  • Multi-language interface
  • Internal storage compartment for accessories or leads


  • Power Transformers
  • Instrument Transformers
  • Voltage Regulators
  • Rotating Machines


The WRT-10 injects a DC current through the windings & measures the voltage drop. The instrument calculates the resistance R= E / I. The challenge in winding resistance measurements is that the voltage across an inductor is defined by V = L (di/dt), where L is the inductance of the winding & (di/dt) is rate of change of current. Therefore small changes in the current, as may be caused by ripple or poor regulation, can make it impossible to measure the DC resistance. The highly regulated and filtered current output of the WRT-10 allows for winding resistance measurements on very large power transformers.



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