What is a potential transformer primarily used for in high voltage systems?

• For power distribution

• For measuring high voltages

• For switching operations

• For measuring high current

What is partial discharge (PD)?

• A substances in the battery maintain chemical equilibrium without any electrochemical reaction

• An equation which imposes relations between the various partial derivatives of a multivariable

• A sudden flow of electrons from one charged object to another

• A localized electrical discharge that partially bridges the insulation between conductors and which can or cannot occur adjacent to a conductor.

Which of the following is NOT a type of partial discharge?

• Internal discharge

• Surface discharge

• Lightning discharge

• Corona discharge

What causes internal discharge in solid dielectric materials?

• High humidity levels
  

• Cavities formed within the material due to high electrical stress

• Sharp edges in the insulating material

• Overheating of the material

What is the primary reason for scaling down high voltage measurements in industrial testing?

• To reduce power consumption
  

• To improve measurement accuracy

• To ensure safety of personnel and equipment

• To reduce electromagnetic interference (EMI)

Which of the following methods is NOT suitable for measuring HVDC?

• Sphere gap

• Electrostatic voltmeter

• Series resistance micro-ammeter

• Potential transformer

According to IEC 60052, what is the accuracy of sphere gap measurements when the ratio of spacing (d) to sphere diameter (D) is less than or equal to 0.5D?

What is the main advantage of capacitive potential dividers over resistive ones?

• Lower cost
  

• Higher accuracy

• Can measure DC voltage

• Overcomes stray capacitances

Which of the following factors does NOT significantly affect sphere gap measurements?

• Temperature

• Color of spheres

• Surface condition of spheres
  

• Pressure

The following are the purpose of PD measurement EXCEPT

• to identify the types of PD

• to detect the flaw in equipment

• to determine the origins of the PD

• To ensure the complete breakdown of insulation