Protection of Electrical Equipment Quiz

Which relay is specifically used for detecting internal faults in transformers?

• Distance relay

• Differential relay

• Impedance relay

• Overcurrent relay

Buchholz relay operates based on:

• Magnetic flux variations

• Gas accumulation in the transformer oil

• High winding temperature

• Overvoltage conditions

Earth fault protection in transformers is used to protect against:

• Phase-to-phase faults

• Phase-to-ground faults

• Overcurrent conditions

• Winding insulation failure

The main purpose of overcurrent protection in transformers is to:

• Detect overheating

• Protect against excessive load currents

• Detect oil leakage

• Monitor voltage fluctuations

Overheating protection for alternators is primarily achieved through:

• Buchholz relay

• RTD (Resistance Temperature Detector) sensors

• Overcurrent relays

• Surge arrestors

Differential protection for alternators is used to detect:

• Internal faults between stator windings

• Overvoltage conditions

• Lightning surges

• Phase unbalance

Which of the following faults can be detected by an overcurrent relay in alternators?

• Internal winding faults

• External short circuits

• Ground faults

• All of the above

Which type of relay is commonly used for overload protection in motors?

• Time-delay relay

• Thermal relay

• Differential relay

• Reverse power relay

Short circuit protection in motors is achieved by:

• HRC fuses

• Circuit breakers

• Overcurrent relays

• All of the above

Overload protection in motors prevents:

• Rotor overheating

• Excessive current flow

• Damage to windings due to prolonged overcurrent

• All of the above