Power Factor Correction Quiz

What is the principle of global compensation in power factor correction?

• The capacitor bank is connected to each local distribution board.

• The capacitor bank is connected to the busbars of the main LV distribution board for the installation.

• The capacitor bank is connected directly to the load.

• The capacitor bank is used to increase the power factor of individual machines.

Which of the following is NOT an advantage of global compensation?

• Reduces the tariff penalties for excessive consumption of kvars.

• Relieves the supply transformer, which is then able to accept more load if necessary.

• Increases the sizing of cables and power losses in them.

• Reduces the apparent power kVA demand, on which standing charges are usually based.

What is a significant benefit of compensation by sector in power factor correction?

• It increases the risk of overcompensation and consequent overvoltage problems.

• It reduces the size of the cables supplying the local distribution boards.

• It allows for additional capacity for possible load increases.

• It increases the tariff penalties for excessive consumption of kvars.

What is a disadvantage of compensation by sector mentioned in the text?

• It reduces the apparent power kVA demand.

• It relieves the supply transformer.

• There is always a risk of overcompensation and consequent overvoltage problems.

• It reduces losses in the same cables.

When should individual compensation be considered according to the text?

• When the power of the motor is negligible with respect to the power of the installation

• When the power of the motor is significant with respect to the declared power requirement (kVA) of the installation

• When the power of the motor exceeds 50% of the kVA rating of the installation

• When the power of the motor is less than 10% of the kVA rating of the installation

What is the order of the kVar rating of the capacitor bank in relation to the kW rating of the motor for individual compensation?

• 50% of the kW rating of the motor

• 25% of the kW rating of the motor

• 75% of the kW rating of the motor

• 10% of the kW rating of the motor

What are the advantages of individual compensation? (Select all that apply)

• Increases the tariff penalties for excessive consumption of kvars

• Reduces the apparent power kVA demand

• Increases the size of all cables as well as the cable losses

• Reduces the size of all cables as well as the cable losses

What is a significant result of individual compensation mentioned in the comments?

• Significant reactive currents are introduced into the installation

• Significant reactive currents are reduced but still present in the installation

• Significant reactive currents no longer exist in the installation

• There is no effect on significant reactive currents in the installation