EHV Test Lab

        SAEW EHV testing facility located at Sriperumbudur. Having excellent testing facilities compared to other EHV Labs in India, SAEW is a first of its kind private lab to have High Voltage for design, testing and R&D work connected with transformers and various other electrical equipment manufactured by the power industry.

The SAEW laboratory is updated with instrumentation in tune with the latest requirements. The lab is qualified for undertaking the testing of manufacturers of Transformers, Insulators, Isolators, Sf6 Circuit Breakers, CTs/CVTs, Lightning Arresters etc., upto 400kV

Test Facilities :

SAEW offers facilities for testing of transformer and also its condition monitoring.

Products Tested :

1 Distribution Transformer
  • IS:2026
  • IS:1180
  • IEC:60076
  • 2 Power Transformer
  • IS:2026
  • IEC:60076
  • 3 Current Transformer
  • IS:2705
  • IEC:60044-1
  • 4
  • Potential Transformer
  • Inductive Voltage Transformer
  • IS:3156
  • IEC:60044-2
  • 5
  • Continuously variable
  • Voltage auto Transformers
  • IS:5142
  • IEC:60989-1
  • 6 Dry type transformer
  • C 57.12.91
  • IS: 11171
  • IEC: 60076-11
  • 7 Reactor IS:5553-1990

    Shree Abirami Enggineering Works EHV Laboratory is a well-known independent laboratory for testing and certification of medium and high voltage Transformers used in the electrical infrastructure. We deal customers with all transformer manufacturers and utilities throughout India.


    Shree Abirami Enggineering Works EHV LaboratoryTest Reports for tests on Distribution transformers, power transformers, Current transformers, Potential transformers, Inductive Voltage transformers, Continuously variable voltage auto transformers, Dry type transformers, Reactors, Insulators, Isolators, SF6 Circuit Breakers, CTs/CVTs, Lightning Arrestors, upto 400 kV.


    Our test engineers and technicians are highly qualified and experienced in (type) testing of medium and high voltage transformers.


    We provide very efficient and cost effective testing of your transformers. Maximum flexibility is offered for meeting your requirements.


    Infrastructure :

    The major facilities included :

    This Laboratory can undertake the following tests as per IS/IEC Standards :

    • Capacitance and tan d measurement
      • -Transformers
      • -Bushings
    • Partial Discharge measurements.
    • Measurement of load loss and No load loss measurement up to 315MVA 400kV class
    • Harmonic measurement (of current at no load).
    • DIRANA
    • Frequency response Analysis
    • Noise level measurement
    • Impulse testing facility upto 2400kVp,180KJ
    • Routine tests of transformer upto 315MVA 400kV.

    1.Capacitance and tan d measurement or Dissipation Factor for Transformers & Bushings :

    Capacitance and Dissipation factor measurement is used to indicative of problem in insulation structure and predicative ageing of insulation


    2.Partial Discharge measurements :

    Partial discharge (PD) diagnostics are used to examine the aging process ofmineral oil-impregnated-high density kraft paper capacitor bushing models, subjectedto repetitive voltage switching surges. It is demonstrated that the PD measurementsof cumulative apparent charge transfer and discharge inception stressconstitute an effective means for assessing aging and its reversibility due to gas evolution and re-absorption or solubility of a mineral oil-impregnated-paper insulation system in the presence and absence of switching surges.


    3. Measurement of load loss and No load loss measurement up to 315MVA 400kV class :

    Load loss :

    The load losses of a transformer are those losses incident to a specified load carried by the transformer.

    Load loss include I˛R loss in the windings due to load current and stray losses due to eddy currents induce by leakage flux in windings, core clamps, magnetic shield, tank walls and other conducting parts

    Impedance voltage is measured during the load loss test by measuring the voltage requires to circulate test current in windings.

    No load loss :

    The purpose of the no-load test is to measure no-load losses and current at a specified excitation voltage and a specified frequency.

    4. Harmonic measurement :

    To determine the percentage of noload current harmonic of the transformer.

    5.Dielectric Response Analyzer test DIRANA:

    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]).

    6. Sweep Frequency response Analysis (SFRA):

    SFRA measurement which is signature analysis, provides vital information of the internal condition of the equipment so that early corrective action could be initiated.

    FRA is performed to check the mechanical integrity of the transformers to ascertain that the transformer active parts has suffered any impacts or jerks during transportation and also any deformities has occurred after any short circuit fault.

    The references frequency responses obtained during laboratory testing serve as “fingerprints” to monitor the condition of transformer or reactor during service.

    7. Noise level measurement :

    To determine the transformer sound level when transformer is in no load and load conditions.

    8. Impulse testing facility upto 2400kVp,180KJ :

    The purpose of the impulse test is to determine the ability of the insulation of the transformer to withstand transient voltage due to lightning.

    9. Routine tests of transformer upto 315MVA 400kV:

    CERTIFICATE for Impulse Test Lab