WorksheetsTransformer Oil Maintenance
Total questions: 10
Worksheet time: 2mins
What are the advantages of Roger's Ratio Method?
Early Fault Detection
Cost Effective
Non-Intrusive
All of the above
Which method measures the temperature at which transformer oil vapors ignite?
Pour Point Test
Flash Point Test
Power Factor Test
Interfacial Tension Test
Which of the following is an objective of physical tests on transformer oil?
Optimize transformer performance
Detect contaminants and aging effects
Ensure reliability and safety
All of the above
Which gas ratio is primarily used in IEC 60599 to identify thermal faults in mineral oil-filled electrical equipment?
CO2/CO
O2/N2
C2H2/C2H4
C2H2/H2
Given gas composition
H2: 8 ppm
CH4: 1313 ppm
C2H2: 2908 ppm
C2H4: 616 ppm
C2H6: 420 ppm
CO: 450 ppm
CO2: 1069 ppm
Low Power Discharge
High Power Discharge
Partial Discharge
Thermal Fault
Which gas is a key indicator of high-temperature overheating in transformer oil?
Methane (CH₄)
Acetylene (C₂H₂)
Ethylene (C₂H₄)
Hydrogen (H₂)
What is the primary purpose of DGA in power transformers?
To monitor the temperature of the transformer oil and ensure it remains within safe operational limits to prevent overheating.
To analyze gases dissolved in the transformer oil, enabling the detection of potential faults as well as to assess insulation aging and degradation.
To ensure that the transformer operates at its maximum load capacity by monitoring performance parameters and optimizing efficiency under varying conditions.
To replace traditional oil sampling practices by providing a non-invasive, real-time analysis of the oil’s condition and fault-related gas composition.
Which of the following tests is used to measure the water content in transformer oil?
Acidity Test
Furan Analysis
Moisture Content Test
Interfacial Tension Test
The presence of Furanic compounds in transformer oil indicates the degradation of which component?
Metal Windings
Insulation Paper
Transformer Casing
Cooling System
What is the primary purpose of the Dielectric Breakdown Voltage (BDV) Test?
To measure the temperature of the oil
To measure the voltage at which oil breaks down
To measure the viscosity of the oil
To measure the density of the oil
