Repair of Oil Filled Power Transformer
❖ Repairing of fail/burn Power Transformer
❖ Re-winding Power Transformer
❖ Re-insulation Power Transformer
❖ Oil Replacement, Drying & IR value improvement of Power Transformer
❖ Vacuum Drying & IR Value improvement of Power Transformer
❖ Nitrogen Drying & IR Value improvement of Power Transformer
❖ Vapor Phase Drying & IR Value improvement of Power Transformer

Repair of Oil Filled Distribution Transformer
❖ Repairing of fail/burn Distribution Transformer
❖ Re-winding Distribution Transformer
❖ Re-insulation Distribution Transformer
❖ Oil Replacement, Drying & IR value improvement of Distribution Transformer
❖ Vacuum Drying & IR Value improvement of Distribution Transformer
❖ Nitrogen Drying & IR Value improvement of Distribution Transformer
❖ Vapor Phase Drying & IR Value improvement of Distribution Transformer

Repair of Oil Filled Current Transformer
❖ Repairing of fail/burn Current Transformer
❖ Re-winding Current Transformer
❖ Re-insulation of Current Transformer
❖ Oil Replacement, Drying & IR value improvement of Current Transformer
❖ Vacuum Drying & IR Value improvement of Current Transformer
❖ Nitrogen Drying & IR Value improvement of Current Transformer
❖ Vapor Phase Drying & IR Value improvement of Current Transformer

Repair of Oil Filled Potential Transformer
❖ Repairing of fail/burn Potential Transformer
❖ Re-winding of Potential Transformer
❖ Re-insulation of Potential Transformer
❖ Oil Replacement, Drying & IR value improvement of Potential Transformer
❖ Vacuum Drying & IR Value improvement of Potential Transformer
❖ Nitrogen Drying & IR Value improvement of Potential Transformer
❖ Vapor Phase Drying & IR Value improvement of Potential Transformer

Repair of Oil Filled Residual Voltage Transformer
❖ Repairing of fail/burn Residual Voltage Transformer
❖ Re-winding of Residual Voltage Transformer
❖ Re-insulation of Residual Voltage Transformer
❖ Oil Replacement, Drying & IR value improvement of Residual Voltage Transformer
❖ Vacuum Drying & IR Value improvement of Residual Voltage Transformer
❖ Nitrogen Drying & IR Value improvement of Residual Voltage Transformer
❖ Vapor Phase Drying & IR Value improvement of Residual Voltage Transformer

Repair of Oil Filled Current Limiting Reactor
❖ Repairing of fail/burn Current Limiting Reactor
❖ Re-winding of Current Limiting Reactor
❖ Re-insulation of Current Limiting Reactor
❖ Oil Replacement, Drying & IR value improvement of Current Limiting Reactor
❖ Vacuum Drying & IR Value improvement of Current Limiting Reactor
❖ Nitrogen Drying & IR Value improvement of Current Limiting Reactor
❖ Vapor Phase Drying & IR Value improvement of Current Limiting Reactor

Avail our service of Vacuum Drying & Insulation Resistance Value (Megger Value) improvement of Power Transformer at our works.

Maintenance

CNT undertake onsite Routine & Major Maintenance Overhaul of Power Transformer.

Filtration, Recondition & Reclaim of Transformer Oil
❖ Filtration to improve its dielectric strength
❖ Recondition high vacuum dehydration to remove moisture content
❖ Reclaim to remove volatile acidic compound Arsenic, Fluoride & Sulfur

On-line, Live-line Filtration of Transformer Oil
❖ 11KV On-line Live-line Transformer Oil Filtration
❖ 22KV On-line Live-line Transformer Oil Filtration
❖ 110KV On-line Live-line Transformer Oil Filtration
❖ 132KV On-line Live-line Transformer Oil Filtration
❖ 220KV On-line Live-line Transformer Oil Filtration

Avail our service of On-Line (Live-Line) Filtration of Transformer Oil.

Routine Maintenance of Power Transformer
❖ Testing of Transformer Oil
❖ Testing of Power Transformer
❖ Maintenance of Transformer
❖ Maintenance of OLTC/Diverter switch
❖ Attending oil Leakages of Transformer
❖ Attending oil Leakages of OLTC/Diverter switch

Major Maintenance of Power Transformer
❖ Overhauling of Transformer
❖ Overhauling of OLTC/Diverter switch
❖ Oil Replacement of OLTC/Diverter switch
❖ Internal Fault Analysis of Transformer
❖ Remnant Life Assessment of Transformer
❖ Vacuum Drying & IR value improvement of Transformer
❖ Oil Replacement, Drying & IR value improvement of Transformer
❖ Nitrogen Drying & IR Value improvement of Transformer
❖ Vapor Phase Drying & IR Value improvement of Transformer

Dry Type (Epoxy) Transformer Servicing
❖ Annual (One Time) Maintenance & Servicing of Dry-type Transformer
❖ Replacement of Cross Ventilation Cooling Fan of Dry-type Transformer

Testing

CNT undertake onsite & at works Testing of Transformer Oil, Power Transformer, Current Transformer, Potential Transformer, Residual Voltage Transformer & Current Limiting Reactor.

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
Avail our service of at Testing of Transformer Oil.

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℃
❖ 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
Avail our service of at Testing of Power Transformer & OLTC. ❖ 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℃
❖ 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
Avail our service of at Testing of CT.

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℃
❖ 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℃
❖ Core-Coil Assembly Condition Analysis
    ✦ Verification of Terminals & Polarity Test
    ✦ Open Delta Test
    ✦ Ratio Error Test
    ✦ Phase Angle Error Test
    ✦ Temperature Rise Test
Avail our service of at Testing of RVT.

Testing of Current Limiting Reactor
❖ 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
    ✦ Winding Resistance Test at 75℃
❖ Coil Assembly Condition Analysis
    ✦ Reactance Test
    ✦ Temperature Rise Test
    ✦ Full Load Loss Test
    ✦ Short-Circuit Impedance Test
Avail our service of at Testing of Current Limiting Reactor.

Consultancy

CNT provides service of Engineering & Technical Consultancy for Power Projects in concept stage, design & development stage, tendering stage & execution stage.

CONCEPT STAGE
❖ Data Collection from Client through RFI
❖ Analysis of collected Data
❖ Preparation of DBR
❖ Approval of DBR from authority
❖ Preparation of Conceptual Design Drawings for approval from authority

DESIGN & DEVELOPMENT STAGE
❖ Submission of DBR to Client
❖ Submission of Schematic Drawing to Client

TENDER STAGE
❖ Preparation of Drawing & Documents for tendering
❖ Preparation of BOQ & Budgetary Estimate
❖ Pre-bid Technical discussion with Vendor
❖ Raising RFQ to approved Vendors
❖ Preparation of Comparative Statement of quotations with estimates
❖ Preparation of Work Schedule

EXECUTION STAGE
❖ Issuing all the GFC drawing & SLD for execution of project
❖ Approval of Shop drawing, GA drawing submitted by contractor
❖ Suggesting various measures to reduce project cost
❖ Regular visits to site for supervision of installation, testing and commissioning
❖ Interaction with site engineers & maintaining quality of work

     

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