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Transformer Oil Test Lab
Transformer Testing
Transformer Rental



Transformer Testing
We are having following Testing Facility for Transformer

  • Dielectric Response Analyzer (DIRANA) Test
  • SFRA Test (Make: Doble)
  • Tan Delta Test (Make: Megger)
  • High Voltage Test
  • Insulation Resistance Test
  • Winding Resistance Test (Scope)
  • Voltage Ratio Test
  • Measuring Open Circut Voltage
  • Measurement S C Current Test
  • OTI and WTI Calibration
  • Magnetic Balance Test
  • Magnetizing Current Test
  • Spill Current Test
  • DVDF Test
  • BDV Test of Transformer Oil
  • Impedance Voltage Test
  • Vector Group Test
  • Earth Resistance Test
  • CT Testing (Kneepoint Voltage Test& Primary Injection)
  • Due Point Test( Doble Make Kit)
  • Moisture Content in Oil(PPM) (Doble Make Kit)
  • Moisture Content in SF6 Gas (Doble Make Kit)
  • CT ,PT & Power Analyser for Loss Measurement(Yokohama)

Dielectric Response Analyzer(DIRANA)Test:-

Dielectric Response Analyer (DIRANA) Test on Transformer Winding (To  determine the moisture content in oil-paper insulations of Winding by Direct Measurement).

This is the Most Advanced Method of Determining the Moisture Content in oil-paper insulations of Transformer Winding.

The DIRANA reduces the required measurement time to 50%, as the device uses a combination of the time and frequency range method (Polarization Depolarization Current [PDC] and Frequency Domain Spectroscopy [FDS]).



  • Water analysis of oil-paper insulation
  • Capacitance and dissipation factor measurement on power transformers
  • Dissipation factor measurement and determination of ageing on bushings
  • Diagnosis of generator, motor and cable insulation, as well as instrument transformers

Key Features:-

  • Extremely fast measurements reduce downtimes
  • Detailed connection diagrams show the correct wiring for various measurement scenarios
  • Automatic determination of the water content with the DIRANA software (no expert knowledge required)
  • Reliable moisture content determination for new and aged oil-paper insulation
  • No overestimation of water content due to unique compensation for ageing by products
  • Evaluation of very dry transformers due to a wide measuring range of 5 kHz to 10 µHz

SFRA Test (Sweep Frequency Response Analysis)
Doble Make SFRA Test Kit

The Purpose of SFRA Test is mainly to check any Mechanical Dislocation inside your transformer during Transportation or due to Fault Condition.

Frequency Sub-Band
< 10 kHz
Main Core; Bulk Winding (Inductance)
10 kHz to 150 kHz
Bulk Component Shunt Impedances
150 kHz to 400 kHz
Main Windings
400 kHz to ~1 MHz
Main windings, Tap windings etc
In This Test Insulation power factor or dissipation factor (Tan delta) and Capacitance measurement of bushing provide an indication of the quality and soundness of the insulation in the bushing.
Eltel Make Tandelta Testing Kit Megger Make Tandelta Testing Kit
In this Test voltage upto 10KV is Applied to Bushing and Winding.There are Two type mode of measured in this method UST & GST Mode.

Insulation Resistance Test(5000 Volts)

Insulation resistance (IR) measurement is the simplest and most widely used test to check the soundness of transformer insulation. This test reveals the condition of insulation (i.e.Degree of dryness of paper insulation), presence of any foreign contaminants in oil and also any gross defect inside the transformer (like failure to remove the temporary transportation bracket on the live portion of tap-changer part).

Kyoritsu Make Insulation Resistance Testing Kit

Winding Resistance Test(25aMPs)

Transformer winding resistance are measured in the field in order to check for any abnormalities due to loose connections, broken strands and high contact resistance in tap
changers as a pre-commissioning checks and compare the measured values with factory
test values.

Scope Make Winding Resistance Test Testing Kit

Voltage Ratio Test

To determine the turns ratio of transformer, Turns Ratio: The Turns Ratio of a transformer is the ratio of the number of turns in a higher voltage winding to that in a lower voltage winding. Transformer turns ratio (TTR) meter available in convenient portable form. They have a hand crank power supply, with the voltages commonly used being very low, such as 12-120 V and 50-60 Hz.

Eltel Make Voltage Ratio Testing Kit
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