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Power transformer test van

To stream-line your on-site assessment of power transformer condition the Megger transformer test van is equipped with a selection of instruments. It arrives on site ready for action to start testing, to rapidly yield and store results, and it even simplifies packing up for you.

Transformer test van

Adiradh Energy offering power  transformer test van uniquely combine several intelligent instruments packaged as a single system. This approach provides all the efficiencies that one would expect from a multifunction solution with all the comfortability and feel of working with a manageable single function instrument. A transformer test van in India and Hyderabad with fully integrated instruments, accessories and test leads, furthers this concept. All lead management takes place at a smart interface at the back-end of the van. At the heart of the system is a switchbox that serves to reduce the collective sets of test leads from all the individual test instruments to a minimum common set



Power transformer test van

The transformer test van combines routine electrical tests and advanced diagnostic techniques to allow a complete transformer check in field. Field experience has shown that automated selection of the instrument and switching through all necessary test arrangements provides a substantial time saving – over 70% – as well as minimising the risk of accidents. The central computer collects all measurement results and the integrated database allows remote accessing, reporting and comparison of the data to the previous test results, eventually building a trend of transformer condition over time. Multiple field tests have proven that the measurement accuracy is in line with that achieved when using individual instruments.To stream-line your on-site assessment of power transformer condition the Megger transformer test van in India is equipped with a selection of instruments. It arrives on site ready for action to start testing, to rapidly yield and store results, and it even simplifies packing up for you.The dedicated transformer test van helps you perform a range of routine electrical tests and advanced diagnostic techniques to international standards.

Overview of Power transformer test van 

  • Routine and advanced diagnostic tests
  • Centralized control and reporting
  • Two sets of cables (HV and LV) are shared among different instruments
  • Automated test circuit arrangement and switching process
  • Safe operation and user guidance through the tests
  • Easy extraction of mounted instruments for standalone use

Measurement techniques provided

Four instruments are integrated into the core of the system:

1,Insulation tester (5 kV megohmmeter)

2. Capacitance and tan delta test set (exciting current)

3. Winding resistance

4. Turns ratio meters.

Optional further test capabilities can be added in Power transformer test van:

  • Short circuit impedance
  • Power loss for no-load and short circuit conditions
  • Frequency response analysis
  • Moisture assessment with the DFR technique
  • Single-phase HV source up to 100 kV AC and 70 kV DC for withstand tests
  • Oil breakdown test set.

Insulation testing

There is a need for preventative testing on transformers taken out of service. Most commonly, measurements of the insulation parameters of transformers and bushings are made with a megohmmeter and a dissipation factor (tan delta) test set. The results provide defined values for the insulation condition, which can indicate the presence of major defects, and in some cases, locate the defect origin

Ratio testing and vector group verification for three-phase transformers

Transformer turns ratio tester and a transformer ohmmeter is deployed. Both devices share the same multi-core leads, so it is practical to develop an LV switch that allows the switching of test leads between these two instruments.Simultaneously with the ratio testing, the instrument determines the vector group of winding interconnection in three-phase power transformers.

Winding resistance measurement

Winding resistance measurements should be performed for all tap positions.Simultaneous connection to the HV and LV terminals allows the use of the dual-magnetization method.  After finishing winding resistance testing, it is recommended to perform core demagnetization (or removal of remaining magnetization). The best transformer ohmmeters provide facilities for doing this.

Power loss measurement-No-load losses

No-load loss measurements are usually done during commissioning and after repairs on service aged transformers in order to identify an inter-turn shorts, core sheet shorts and core-ground faults. It is recommended that the no-load test is carried out at 380/220 V.

Short circuit losses

This test is used to determine the complex short circuit impedance (Zk) of transformers to identify possible deformations with winding damages due to through-fault currents. This information is derived from the comparison of the test results with the initial Zk value measured by the manufacturer.The short circuit test is carried out with a low-test voltage (380, 220 V).

Adiradh Energy offers Power transformer test van in India; Hyderabad; Visakhapatnam; Vijayawada; Chennai; Puducherry; Trichy; Coimbatore; Hosur; Bangalore; Hubli; Mysore; Cochin; Kolkata; Pune; Goa; Mumbai; Thane; Kanpur; Jaipur; Nagpur; Delhi; Noida; Gurugam; Bhopal; Vadodara; Ahmedabad; Chandigarh; Chandigarh; Tata Nagar; Raipur; Rudrapur;; Durgapur; Kharagpur; Raigarh; Bhilai;Angul; Haldia; Jabalpur; Indore; Jamshedpur; Rajahmundry; Bokaro Steel City; Salem; Kochi; Rourkela; Ahmedabad ;Jamnagar; Bharuch; Sri City; Nashik; Haridwar; Mathura; Aurangabad; Bhubaneswar and other cities

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