Transformers - Learning Outcomes

A pole-mounted transformer is installed on utility poles, while a pad-mounted transformer is installed on the ground. Identify which is which.

• Pole-mounted transformer is on utility poles; pad-mounted transformer is on the ground.

• Pole-mounted transformer is on the ground; pad-mounted transformer is on utility poles.

• Both are installed on the ground.

• Both are installed on utility poles.

Identify the primary and secondary bushings of a transformer.

• The bushings connected to the high voltage and low voltage windings respectively

• The bushings connected to the core and the tank

• The bushings used for cooling the transformer

• The bushings used for earthing only

The kVA rating of a transformer can be found on:

• the nameplate

• the winding

• the core

• the oil tank

The difference between a conventional and CSP (Completely Self-Protected) transformer is:

• CSP transformers have built-in protection devices, while conventional transformers do not.

• Conventional transformers are more compact than CSP transformers.

• CSP transformers require external protection devices, while conventional transformers do not.

• There is no difference between conventional and CSP transformers.

The core of a transformer is made of:

• Copper

• Aluminium

• Silicon steel laminations

• Plastic

The function of the windings in a transformer is to:

• Transfer electrical energy between circuits through electromagnetic induction.

• Increase the resistance in the circuit.

• Store electrical energy as chemical energy.

• Convert AC to DC.

The purpose of insulating fluids in a transformer is:

• To provide electrical insulation and dissipate heat

• To increase the voltage

• To reduce the size of the transformer

• To improve the efficiency of the core

The purpose of the pressure relief valve in a transformer is:

• To regulate the voltage

• To prevent overheating

• To release excess pressure and protect the transformer

• To increase the efficiency

Which of the following best defines induction, turns ratio, polarity, losses, and impedance in the context of transformers?

• They are key electrical properties and characteristics that determine transformer operation and performance.

• They are types of transformer windings.

• They are transformer cooling methods.

• They are transformer core materials.

The turns ratio of a transformer is calculated by dividing the number of primary windings by the number of secondary windings. What is the turns ratio if the primary has 200 windings and the secondary has 50 windings?

• 2:1

• 4:1

• 1:2

• 1:4