Condition Monitoring of Transformers

Tests on Transformers:

1. Insulation Resistance (IR).
2. Polarization Index (PI).
3. DC Absorption Test.
4. Capacitance & Tan Delta Test.(On Insulation)
5. Leakage Current Test.
6. Magnetic Balance and Magnetizing Current Test.
7. Capacitance & Tan Delta Test.(On Bushings)
8. Ratio and Phase Angle Error Test
9. Short Circuit Impedance
10. Winding Resistance and OLTC Tap changer Test
11. Excitation current
12. SFRA (Sweep Frequency Response Analyzer)
13. Partial Discharge (Offline and Online)
14. DIRANA (Dielectric Response Analysis)
    (Measurement of Moisture Content in Solid Insulation)

Transformer oil Reclamation (On Line)

Condition Monitoring of all Switch Yard Equipments

Tests on CTs:

1. Capacitance & Tan Delta Test.
2. Insulation Resistance (IR).
3. Polarization Index (PI).
4. DC Absorption Test.
5. Primary Injection, Ratio.
6. Excitation curve
7. Winding resistance

Tests on VTs and CVTs:

1. Capacitance &Tan Delta Test.
2. Insulation Resistance (IR).
3. Polarization Index (PI).
4. DC Absorption Test.
5. Ratio

Tests on Lightning Arrestor:

1. Insulation Resistance. (Off Line)
2. Capacitance and Tan Delta. (Off Line)
3. Leakage Current/Resistive Current. (On Line)
4. 3rd Harmonic Measurement. (On Line)

Tests on Circuit Breaker:

1. Measurement of Tripping & Closing Time.
2. Insulation Resistance (IR).
3. Polarization Index (PI)
4. Contact Resistance
5. Dynamic Contact Resistance
6. Motion/Velocity Measurement

Condition Monitoring Tests on Generators and Motors:

Off Line Tests:

1. Insulation Resistance (IR).
2. Polarization Index (PI).
3. DC Absorption Test.
4. Capacitance & Tan Delta Test.
5. Leakage Current Test.
6. DC Resistance.
7. Short Circuit Impedance
8. Surge Comparison Test
9. HI-POT Test
10. Digital RSO test on Rotor Winding
11. Online Partial Discharge
12. Offline Partial Discharge measurement on DG Set
13. ELCID Test

On Line Tests:

1. Vibration Analysis
2. Motor Current Signature Analysis
3. Thermograph

Condition Monitoring of Switch Gear Panels

Omicron CMC 356

Testing of Relays (Using Digital Kit Omicron CMC 356)

1. Electromechanical relays
2. Static relays
3. Numerical relays
4. Testing of Relays

Tests on CTs:

1. Insulation Resistance (IR).
2. Polarization Index (PI).
3. DC Absorption Test.
4. Primary Injection, Ratio.
5. Excitation curve (Knee Point Measurement)
6. Winding resistance
7. Burden and Polarity

Tests on PTs:

1. Insulation Resistance (IR).
2. Polarization Index (PI).
3. DC Absorption Test.
4. Ratio

Test on Circuit Breaker:

1. Measurement of Tripping & Closing Time.
2. Insulation Resistance (IR).
3. Polarization Index (PI)
4. Contact Resistance

Condition Monitoring of Cables

Tests on HV Cable:

1. Capacitance & Tan Delta Test.
2. Insulation Resistance (IR).
3. Polarization Index (PI).
4. DC Resistance
5. Leakage Current Test.
6. DC Absorption Test.
7. Hi-Pot Test
8. Cable Fault Locate.

Earth Resistance Testing:

1. Measurement of Earth Resistance

Tests on Transformer Oil:

1. Interfacial Tension.
2. Neutralization Number.
3. Moisture Content.
4. Flash Point.
5. Sludge.
6. Dielectric Dissipation Factor.
7. Dielectric Strength.
8. Resistivity.
9. Dissolved Gas Analysis:
   Methane
   Ethane
   Ethylene.
   Acetylene
   Carbon Dioxide
   Carbon Monoxide
   Hydrogen
   Oxygen
   Nitrogen
   Total Gas Content
10. FURAN ANALYSIS

We have the Industrial Experience in:

1. Electric Control Panel
2. Industrial Automation Panel
3. PLC Based Automation Panel
4. VFD Panel, Motor Control Centre
5. PLC Base Automation Panel For Hydraulic Press
6. Distribution Panel
7. MCC with PLC Panel
8. Out Door Unit Panels
9. PLC Panel, RO Plant Panel
10. Chillers Panels, Drive Panels
11. Control Desk Panels
12. Sewage Treatment Plant Panels
13. AHU Panels, Automation Panels
14. Distribution Panels
15. Instrument Panels and Water Treatment Plant Panel

Preventive Maintenance of Transformers:

• Checking Tightness and Cleaning of HT and LT Connections
• Checking and Cleaning NGR
• Checking of Bucholz Relay
• Checking WTI and OTI operation
• Checking Resistance
• Checking IR value

Preventive Maintenance of HT and LT Panel:

• Checking Tightness of Wiring and
• Cleaning of HT and LT Panels
• Checking Resistance
• Checking IR value
• Primary Injection of CTs
• Cleaning of Circuit Breaker
• Testing of Contact Resistance of Breaker
• Testing of Open and Close Timing of Breaker
• Testing of Relay (Optional)

Preventive Maintenance of Bus Duct:

• Checking of Tightness and Cleaning of Bus Duct
• Checking Resistance
• Checking of IR value

Annual Maintenance of Transformers:

• Checking Tightness and Cleaning of HT and LT Connections
• Checking and Cleaning NGR
• Checking of Bucholz Relay
• Checking WTI and OTI operation
• Checking Resistance
• Checking IR value

Annual Maintenance of HT and LT Panel:

• Checking IR value
• Primary Injection of CTs
• Testing of Contact Resistance of Breaker
• Testing of Open and Close Timing of Breaker
• Testing of Relay

Electrical Motor Winding

Example of Short Circuit
Thermograph of :

1. Switch Yard
2. Transformers
3. Switch Gear Panels
4. Motors and Generators
5. Pumps

Advantages of Thermograph

You get a visual picture

So that you can compare temperatures over large area

It is real time capable of catching moving targets

Able to find deteriorating components prior to failure

Measurement in areas inaccessible or hazardous