CNT RESEARCH undertake testing of Transformer Oil, Power Transformers, Current Transformers, Potential Transformers, Residual Voltage Transformers, Current Limiting Reactors, EHT SF6 Breakers, HT SF6 Breakers, HT VCB Breakers, HT OCB Breakers, HT RMU Breakers, HT Breaker Protection Relays, LT ACB Breakers and LT OCB Breakers.

Testing of Transformer Oil
❖ Electrical Properties Analysis
    ✦ Dielectric Strength Test
    ✦ Dielectric Dissipation Factor Test
    ✦ Specific Resistance Test
❖ Chemical Properties Analysis
    ✦ Neutralization Value Test
    ✦ Water Content Test
    ✦ Sediments & Sludge Test
❖ Physical Properties Analysis
    ✦ Physical condition & Appearance Test
    ✦ Density Test
    ✦ Flash Point Test
    ✦ Inter Facial Tension Test
    ✦ Kinematic Viscosity Test
    ✦ Pour Point Test
❖ Power Transformer Internal Fault Analysis
    ✦ Dissolved Gases Analysis (DGA)
        ★ Total Dissolved Combustible Gas
        ★ Concentration of component gases
            ⚬ Hydrogen H2
            ⚬ Oxygen O2
            ⚬ Nitrogen N2
            ⚬ Carbon Monoxide CO
            ⚬ Carbon Dioxide CO2
            ⚬ Methane CH4
            ⚬ Ethane C2H6
            ⚬ Ethylene C2H4
            ⚬ Acetyline C2H2
            ⚬ Propane C3H8
            ⚬ Propylene C3H6
❖ Power Transformer Remnant Life Assessment
    ✦ FURAN Analysis
    ✦ 2,6-di-tert-Butyl p-Cresol (DBPC) Analysis &
      2,6-di-tert-Butyl Phenol (DBP) Analysis
❖ Transformer Oil Remnant Life Assessment
    ✦ Polychlorinated Biphenlyls (PCB's) Analysis
    ✦ Corrosive Sulphur Test
    ✦ Oxidation Stability

Testing of Power Transformer
❖ Insulation Condition Analysis
    ✦ Insulation Resistance & Polarization Index Test
    ✦ Dissipation Factor (Tan δ) Test of Insulation Capacitance
    ✦ Capacitance Test
    ✦ Induced High Voltage Test
    ✦ Power Frequency High Voltage Test
    ✦ Double Frequency High Voltage Test
❖ Winding Condition Analysis
    ✦ HV Winding Resistance Test at 75℃
    ✦ LV Winding Resistance Test at 75℃
    ✦ Thermography Test
❖ Core-Coil Assembly Condition Analysis
    ✦ Verification of Terminals & Polarity Test
    ✦ Magnetic Balance Test
    ✦ Magnetization Current Test
    ✦ No Load Loss Test
    ✦ No Load Current Test
    ✦ No Load Current Harmonics Test
    ✦ Full Load Loss Test
    ✦ Short-Circuit Impedance Test
    ✦ Zero-Sequence Impedance Test
    ✦ Ratio Test on all tap position
    ✦ Vector Group Test
    ✦ Sweep Frequency Response Analysis Test
    ✦ Sound Level Test
❖ On-load Tap-Changer Assembly Condition Analysis
    ✦ Operation Test
    ✦ Auxiliary Circuit Insulation Test
❖ Control Simulation Analysis
    ✦ MOG Operation Test
    ✦ Buchholz Relay Operation Test
    ✦ OSR Operation Test
    ✦ PRD Test Operation Test (Main tank)
    ✦ PRD Test Operation Test (OLTC tank)
    ✦ OTI Calibration Test
    ✦ WTI Calibration Test
❖ Earthing Pit Analysis
    ✦ Earth Resistance Test

Testing of Current Transformer
❖ Insulation Condition Analysis
    ✦ Insulation Resistance Test
    ✦ Tan Delta (Tan δ) & Capacitance Test
    ✦ Overvoltage Interturn Test
    ✦ Power Frequency High Voltage Test
    ✦ Double Frequency High Voltage Test
❖ Winding Condition Analysis
    ✦ Primary Winding Resistance Test at 75℃
    ✦ Secondary Winding Resistance Test at 75℃
    ✦ Thermography Test
❖ Core-Coil Assembly Condition Analysis
    ✦ Verification of Terminals & Polarity Test
    ✦ Magnetization Curve Test
    ✦ Knee Point Voltage Test
    ✦ Composite Error Test
    ✦ Ratio Error Test
    ✦ Phase Angle Error Test
    ✦ Temperature Rise Test

Testing of Potential Transformer
❖ Insulation Condition Analysis
    ✦ Insulation Resistance Test
    ✦ Capacitance & Tan Delta (Tan δ) Test
    ✦ Induced High Voltage Test
    ✦ Power Frequency High Voltage Test
    ✦ Double Frequency High Voltage Test
❖ Winding Condition Analysis
    ✦ Primary Winding Resistance Test at 75℃
    ✦ Secondary Winding Resistance Test at 75℃
    ✦ Thermography Test
❖ Core-Coil Assembly Condition Analysis
    ✦ Verification of Terminals & Polarity Test
    ✦ Ratio Error Test
    ✦ Phase Angle Error Test
    ✦ Temperature Rise Test

Testing of Residual Voltage Transformer
❖ Insulation Condition Analysis
    ✦ Insulation Resistance Test
    ✦ Capacitance & Tan Delta (Tan δ) Test
    ✦ Induced High Voltage Test
    ✦ Power Frequency High Voltage Test
    ✦ Double Frequency High Voltage Test
❖ Winding Condition Analysis
    ✦ Primary Winding Resistance Test at 75℃
    ✦ Secondary Winding Resistance Test at 75℃
    ✦ Thermography Test
❖ Core-Coil Assembly Condition Analysis
    ✦ Verification of Terminals & Polarity Test
    ✦ Open Delta Test
    ✦ Ratio Error Test
    ✦ Phase Angle Error Test
    ✦ Temperature Rise Test

Testing of Current Limiting Reactor
❖ Insulation Condition Analysis
    ✦ Insulation Resistance Test
    ✦ Capacitance & Tan Delta (Tan δ) Test
    ✦ Power Frequency High Voltage Test
    ✦ Double Frequency High Voltage Test
❖ Winding Condition Analysis
    ✦ Winding Resistance Test at 75℃
    ✦ Thermography Test
❖ Coil Assembly Condition Analysis
    ✦ Reactance Test
    ✦ Temperature Rise Test
    ✦ Full Load Loss Test
    ✦ Short-Circuit Impedance Test

Testing of EHT & HT SF6 Circuit Breaker
❖ Insulation Condition Analysis
    ✦ Insulation Resistance Test
    ✦ Power Frequency High Voltage Test
❖ Contacts Condition Analysis
    ✦ Contact Resistance Test at 75℃
    ✦ Thermography Test
❖ Triping Coil Condition Analysis
    ✦ Relay Test
    ✦ Alarm Test
    ✦ Triping Test
❖ Triping CT Condition Analysis
    ✦ Insulation Resistance Test
    ✦ Primary Current Injection Test
    ✦ Overvoltage Interturn Test
    ✦ Power Frequency High Voltage Test
    ✦ Secondary Winding Resistance Test at 75℃
    ✦ Current Ratio Test

Testing of HT Vaccum Circuit Breaker
❖ Insulation Condition Analysis
    ✦ Insulation Resistance Test
    ✦ Power Frequency High Voltage Test
❖ Contacts Condition Analysis
    ✦ Contact Resistance Test at 75℃
    ✦ Thermography Test
❖ Triping Coil Condition Analysis
    ✦ Relay Test
    ✦ Alarm Test
    ✦ Triping Test
❖ Triping CT Condition Analysis
    ✦ Insulation Resistance Test
    ✦ Primary Current Injection Test
    ✦ Overvoltage Interturn Test
    ✦ Power Frequency High Voltage Test
    ✦ Secondary Winding Resistance Test at 75℃
    ✦ Current Ratio Test

Testing of HT Oil Circuit Breaker
❖ Insulation Condition Analysis
    ✦ Dielectric strength Test
    ✦ Insulation Resistance Test
    ✦ Power Frequency High Voltage Test
❖ Contacts Condition Analysis
    ✦ Contact Resistance Test at 75℃
    ✦ Thermography Test
❖ Triping Coil Condition Analysis
    ✦ Relay Test
    ✦ Alarm Test
    ✦ Triping Test
❖ Triping CT Condition Analysis
    ✦ Insulation Resistance Test
    ✦ Primary Current Injection Test
    ✦ Overvoltage Interturn Test
    ✦ Power Frequency High Voltage Test
    ✦ Secondary Winding Resistance Test at 75℃
    ✦ Current Ratio Test

Testing of HT Ring Main Unit Breaker
❖ Insulation Condition Analysis
    ✦ Dielectric strength Test
    ✦ Insulation Resistance Test
    ✦ Power Frequency High Voltage Test
❖ Contacts Condition Analysis
    ✦ Contact Resistance Test at 75℃
    ✦ Thermography Test
❖ Triping Coil Condition Analysis
    ✦ Relay Test
    ✦ Alarm Test
    ✦ Triping Test
❖ Triping CT Condition Analysis
    ✦ Insulation Resistance Test
    ✦ Primary Current Injection Test
    ✦ Overvoltage Interturn Test
    ✦ Power Frequency High Voltage Test
    ✦ Secondary Winding Resistance Test at 75℃
    ✦ Current Ratio Test

Testing LT Oil Circuit Breaker
❖ Insulation Condition Analysis
    ✦ Dielectric strength Test
    ✦ Insulation Resistance Test
    ✦ Power Frequency High Voltage Test
❖ Contacts Condition Analysis
    ✦ Contact Resistance Test at 75℃
    ✦ Thermography Test
❖ Triping Coil Condition Analysis
    ✦ Relay Test
    ✦ Alarm Test
    ✦ Triping Test
❖ Triping CT Condition Analysis
    ✦ Insulation Resistance Test
    ✦ Primary Current Injection Test
    ✦ Overvoltage Interturn Test
    ✦ Power Frequency High Voltage Test
    ✦ Secondary Winding Resistance Test at 75℃
    ✦ Current Ratio Test

Testing LT Air Circuit Breaker
❖ Insulation Condition Analysis
    ✦ Insulation Resistance Test
    ✦ Power Frequency High Voltage Test
❖ Contacts Condition Analysis
    ✦ Contact Resistance Test at 75℃
    ✦ Thermography Test
❖ Triping Coil Condition Analysis
    ✦ Relay Test
    ✦ Alarm Test
    ✦ Triping Test
❖ Triping CT Condition Analysis
    ✦ Insulation Resistance Test
    ✦ Primary Current Injection Test
    ✦ Overvoltage Interturn Test
    ✦ Power Frequency High Voltage Test
    ✦ Secondary Winding Resistance Test at 75℃
    ✦ Current Ratio Test

Testing of Protection Relays
❖ Power Transformer Primary Winding Phase to Phase Fault Analysis
    ✦ Differential Protection Relay Test
    ✦ Overcurrent Protection Relay Test
❖ Power Transformer Primary Winding Phase to Earth Fault Analysis
    ✦ Differential Protection Relay Test
    ✦ Overcurrent Protection Relay Test
❖ Power Transformer Secondary Winding Phase to Phase Fault Analysis
    ✦ Differential Protection Relay Test
❖ Power Transformer Secondary Winding Phase to Earth Fault Analysis
    ✦ Differential Protection Relay Test
    ✦ Restricted Earth Fault Relay Test
❖ Power Transformer Winding Interturn Fault Analysis
    ✦ Differential Protection Relay Test
    ✦ Buchholz Gas Relay Test
❖ Power Transformer Core Flashover Arcing Fault Analysis
    ✦ Differential Protection Relay Test
    ✦ Buchholz Gas Relay Test
❖ Power Transformer Oil Tank Flashover Arcing Fault Analysis
    ✦ Differential Protection Relay Test
    ✦ Buchholz Gas Relay Test
    ✦ Earth Resistance Test
❖ Power Transformer Overfluxing Fault Analysis
    ✦ Overfluxing Test
❖ Power Transformer Overheating Fault Analysis
    ✦ Thermography Test

Contact us

✆ 9321690034
    9320690034
    9820690034
✉ cnt@cnt.org.in
     www.cnt.org.in
        

Tushar Shinde
Proprietor
CNT RESEARCH
MIDC, Badlapur, Thane 421503, India