SA4 - HV & LV Electrical Protections

What is the main purpose of switchgear?

• To provide internet connectivity

• To control the weather

• To protect the power system from harm during fault conditions

• To generate electricity

Answer explanation

The main purpose of switchgear is to protect the power system from harm during fault conditions.

What is the function of a fuse in an electrical circuit?

• To increase current flow

• To detect faults

• To melt and disconnect the circuit during excessive current flow

• To provide lighting

Answer explanation

To melt and disconnect the circuit during excessive current flow

What is the purpose of a circuit breaker?

• To create short circuits

• To open or close a circuit under all conditions

• To increase voltage

• To cool down the system

Answer explanation

To open or close a circuit under all conditions

What is the function of a relay in a circuit breaker?

• To increase resistance

• To provide lighting

• To detect faults and supply information to the circuit breaker for interruption

• To generate power

Answer explanation

To detect faults and supply information to the circuit breaker for interruption

What is the purpose of a current transformer?

• To step up voltage

• To isolate relay circuits from the high voltage system

• To provide internet connectivity

• To increase current flow

Answer explanation

The purpose of a current transformer is to isolate relay circuits from the high voltage system.

What is the function of an isolator or disconnecting switch?

• To detect faults

• To increase current flow

• To open a circuit under NO load

• To open a circuit under load

Answer explanation

To open a circuit under NO load

What is the main classification of switchgear?

• No classification

• High voltage only

• Low voltage only

• Both low voltage and high voltage

Answer explanation

The main classification of switchgear includes both low voltage and high voltage equipment, covering a wide range of electrical distribution systems.

What is the purpose of a fire-wall in an electrical system?

• To increase current flow

• To cool down the system

• Water containment barrier

• Fire containment barrier

Answer explanation

The purpose of a fire-wall in an electrical system is to act as a fire containment barrier, preventing the spread of fire within the system.

What is the function of an air-break switch?

• To increase resistance

• To open a circuit under load

• To open a circuit under NO load

• To generate power

Answer explanation

To open a circuit under load

What is the purpose of a potential transformer?

• To provide internet connectivity

• To increase current flow

• To step up voltage

• To step down voltage

Answer explanation

The purpose of a potential transformer is to step down voltage, not to provide internet connectivity, increase current flow, or step up voltage.