Power factor tariff in power plant engineering sector
Power factor tariff:
- The tariff in which the power factor of the consumer’s load is taken into consideration is known as power factor
- In an A.C. system power factor plays an important role.
- A low power factor increases the rating of station equipment and line losses.
The following are the important types of power factor tariff:
- kVA maximum demand tariff:
- It is modified form of two-part tariff.
- In this type the fixed charges are made on the basis of maximum demand in kVA and not in kW.
- As kVA is inversely proportional to power factor, therefore, a consumer having low power factor has to contribute more towards fixed charges.
- It encourages the consumers to operate their appliances and machinery at improved power factor.
- Sliding scale tariff:
- This is known as average power factor tariff.
- In this case an average power factor (say 0.8 lagging) is taken as the reference
- If the power factor of the consumer falls below this factor, suitable additional charges are made
- If the power factor is above the reference, a discount is allowed to the consumer
- kW and kVAR tariff:
- In this type both active (kW) and reactive (kVAR) power supplied are charged separately.
- A consumer having low power factor will draw more reactive power and hence shall have to pay more charges.