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WorksheetsQuiz: High Voltage Measurement
Total questions: 11
Worksheet time: 6mins
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?
± 5%
± 1%
± 3%
± 7%
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
Which of the following is an advantage of vertical alignment over horizontal alignment in sphere gap measurement?
Have a higher voltage measurement range
Have a lower voltage measurement range
have a smaller sphere dimension
maximize the influence of dust particles
