Diagnostics Laboratory

The Laboratory has facilities for conducting diagnostic testing/condition assessment of HV Power Equipment like Power Transformers, Hydro and Turbo Generators, Power Cables, Large AC Motors, Current Transformers (CTs), Capacitance Voltage Transformers (CVTs), Lightning Arresters etc. in service. The laboratory has adequate experience and expertise in conducting Residual Life assessment Studies on High Voltage Substation and Power Plant Electrical Equipment in service. Diagnostic Laboratory is an accredited Laboratory as per ISO 9001-2015 Quality Management System for undertaking field engineering consultancy services for various utilities

Test / Equipment Facilitoes: -

  • Insulation Resistance Meter up to 5kV DC
  • Automatic Capacitance and Tan delta Test System with Resonator up to 12 kV
  • Recovery Voltage Meter up to 2 kV DC
  • Dielectric Spectroscopy Test Kit up to 2 kV peak.
  • Polarization Depolarization Current Kit
  • Sweep Frequency Response Analysis Test Kit
  • Leakage Reactance/Short Circuit Impedance Measurement Kit
  • Automatic Three Phase Transformer Turns Ratio Meter
  • Winding Resistance Meter up to 50 A DC
  • Partial Discharge Detection System by Acoustic Emission
  • Partial Discharge Detection System
  • Advanced Winding Analyser Kit for Surge Comparison, DC Leakage Current and DC High Potential Test up to 12 kV
  • Rotor Reflectometer
  • Electro Magnetic Core Imperfection Detector (ELCID)
  • Wedge Tightness Detector
  • HV Dielectric Spectroscopy upto 30 kV rms
  • VLF Cable Diagnosis Test System up to 42kV rms, 60 kV peak 
  • Damped AC Partial Discharge Test System up to 42kV rms, 60 kV peak
  • DC Dielectric Test Set up to 100 kV DC

CONSULTANCY: -

  • Consultancy through Field Testing

Diagnostic laboratory is equipped with test facilities for undertaking condition monitoring/diagnostic tests on HV Power Equipment in order to assess the state and condition of their insulation systems. Diagnostics test facilities are extensively used by State Electricity Boards, Thermal Power Stations, Nuclear Power Stations, Hydro Power Stations, Petro Chemical Plants, Process Industries and the like.

  • Involved in Renovation and Modernization (R&M) & Residual Life Assessment (RLA) Studies.

Majority of the generating sets operating in our country are about 35-40 years old and have already come to the end of their notional design life. In recent times, with the ever growing demand for power, high cost of new equipment and paucity of funds there is an increasing trend to upgrade and extend the life of older generating sets. It has been recognized that with the advent of new technologies there is a scope for upgrading of generating capacity of the generators. In the light of this, knowledge of integrity of these machines and their remaining service life would be of great interest. In this, endeavor; there is a strong incentive for condition assessment of various components of these machines. Over the years many diagnostic tests have been suggested for condition monitoring of different components of the machines. The data obtained from these tests provide much needed information regarding present state and condition of the components.

  • Failure Investigation of EHV/HV Power Equipment.

To understand the root cause of failure of any power plant equipment, failure investigation is carried out. Diagnostic laboratory is equipped with facilities and expertise for failure investigation of failure of HV equipment line generators, HT Motors, Power Cable etc.

DIAGNOSTIC TESTS:-

Product / Apparatus / Type of Tests Conducted

Power Transformer

Insulation Resistance/Polarization Index Test, Capacitance and Tan Delta Measurement on Windings and Bushings, Recovery Voltage Measurement, Dielectric Spectroscopy, Polarization Depolarization Current, Sweep Frequency Response Analysis, Transformer Turns Ratio, Short Circuit Impedance, Magnetising Current test, Magnetic balance Test, Winding Resistance Measurement, Core Insulation Resistance Test, On-line Partial Discharge Measurement by Acoustic Emission Method

Generator / Large Motors / Stator / Rotor

Insulation Resistance/Polarization Index Test, Capacitance and Tan Delta Measurement, Partial Discharge Measurement, Surge Comparison Measurement, Conductor Resistance Measurement, Electro Magnetic Core Imperfection Detection (ELCID) Test, Wedge Mapping Test, Recurrent Surge Oscillogram (RSO ) Test, Field Impedance Test, Pole Drop Test

Power Cables (Up to 66kV)

Insulation Resistance/Polarization Index Test, Capacitance and Tan Delta Measurement, Very Low Frequency (VLF) Capacitance and Tan Delta Test, Partial Discharge Measurement by VLF and Damped AC Voltage

EHV CTs / CVTs

Insulation Resistance/Polarization Index Test, Capacitance and Tan Delta Measurement

Resin Cast CTs (up to 33kV)

Insulation Resistance/Polarization Index Test, Capacitance and Tan Delta Measurement

Resin Cast PTs (up to 33kV)

Insulation Resistance/Polarization Index Test, Capacitance and Tan Delta Measurement, Partial Discharge Test

Lightning Arresters

On-line Third Harmonic Resistive Leakage measurement, Off-line DC Leakage Current Measurement

CLIENTEE: -

Diagnostics test facilities are extensively used by State Electricity Boards, Thermal Power Stations, Nuclear Power Stations, Hydro Power Stations, Petro Chemical Plants, Process Industries and the like.

TRAINING: -

The diagnostic laboratory provides customized training in the area of diagnostic testing and condition assessment of HV/EHV Power equipment.

Contact Details

Smt.Meena K P
Joint Director/HoD
Cables and Diagnostics Division
Phone: +91 (0) 80 22072333
Mobile: +91 9731551059
E-Mail : meena@cpri.in