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MAXIMUM DEMAND (M.D.): -

It is the greatest demand of load on the power station during a given period.

I.e. The maximum of all the demands that have occurred during a given period (may be a day, may be an hour etc.).

Need of maximum demand in Electricity bill?

When the rate of electrical energy is charged on the basis of maximum demand of the consumer & the units consumed, it is called two-part tariff.

In this total charge is divided into two.

A) Fixed charge à depends on maximum demand of consumer

B) Running charge à depends on no. of units consumed

It is measuring by installing maximum demand meter. Charges are made on the basis of maximum demand in kVA & not in kW

Maximum demand used to be measured by a demand needle on the meter, that would actually store only a peak demand. When you start an electric motor, this peak can be very high for a second or two. For this reason, more modern meters calculate an average demand over some period of time (often 15 minutes), and the maximum of those average demands is used as the maximum demand for billing purposes.

Billing by maximum demand allows the utility to bill for the cost of installing better wiring and Transformers for customers with a large active demand (KW).

Values other than KW can be measured the same way for other demand values.

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Q: Definition of maximum demand
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