Electrical Engineering ⇒ Topic : Various types of Tariffs
Various types of Tariffs:-
Flat demand rate:-
The flat demand rate is expressed as follows :
i. e., the bill depends only on the maxirnum demand irrespective of amount of energy consumed.By the use of this form of tariff the cost of metering equipment and meter reading is eliminated.
Straight meter rate:-
The straight meter rate can be expressed in the form
Here the charge per unit is constant.
Block meter rate:-
The term 'block' indicates that a certain specified price unit is charged for all or any part of such units. The reduced prices per unit are charged for all or any part of succeeding blocks of units, each such reduced price per unit applying only to a particular block or portion there of. Its main defect is that it lacks a measure of the customer's demand
Hopkinson demand rate (Two part tariff):-
This method charges the consumer according to his maximum demand and energy consumption.
This can be expressed as
z = a + b.y
This method requires two meters to record the maximum demand and energy consumption of the consumer. This form of tariff is used for industrial consumers.
Doherty rate (Three part tariff):-
It consists of a customer or meter charge, plus a demand charge plus any energy charge.
This is expressed as follows :
y = a.x + b.y + c ...(18.10)
As it requires two meters it is better suited for industrial than for residential customers.
Wright demand rate:-
This rate intensifies the inducement by lowering both the demand and energy charge for a reduction in maximum demand or in other words an improvement in load factor. This rate is usually specified /Or industrial customers who have some measure of control over their maximum demands
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