Learning Outcome 6

What is the purpose of a Buchholz relay?

• To detect and respond to internal faults in oil-filled transformers

• To stabilize the voltage in the secondary circuits of transformers

• To measure the temperature of transformer windings

• To ground the core and secondary windings of transformers

Which component of a Buchholz relay detects internal faults?

• Main Housing

• Float Chamber

• Float

• Pipes

What does not trigger the Buchholz relay to trip the transformer?

• Gas accumulation in the float chamber

• Oil flow into the float chamber

• Movement of the main housing

• Temperature rise in the transformer

What is the purpose of measuring transformer winding temperature?

• To detect and respond to internal faults in transformers

• To destabilize the voltage in the secondary circuits of transformers

• To ground the core and secondary windings of transformers

Which temperature-sensing devices are commonly used in transformer windings?

• Resistance Temperature Detectors (RTDs)

• Thermocouples

• Both RTDs and Thermocouples

• Temperature Controllers

What is the purpose of grounding the core and secondary windings in voltage and current transformers?

• To detect and respond to internal faults in transformers

• To stabilize the voltage in the secondary circuits of transformers

• To measure the temperature of transformer windings

• To ensure safety

What does grounding the core and secondary windings help minimize?

• Risk of electric shock

• Voltage transients

• Voltage stress

• All of the above

What does grounding the core and secondary windings help protect?

• Sensitive connected equipment

• Insulation materials

• Both connected equipment and insulation materials

• None of the above

What can grounding the core and secondary windings help shield the transformer from?

• External electromagnetic interference

• High-voltage spikes

• Both external electromagnetic interference and high-voltage spikes

• None of the above

Why is grounding the core and secondary windings important for compliance with standards?

• To ensure safety and proper system operation

• To stabilize the voltage in the secondary circuits of transformers

• To measure the temperature of transformer windings

• To detect and respond to internal faults in transformers