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Maximum demand indicator

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A Maximum Demand Indicator (MDI) is an instrument which measures the maximum amount of electrical energy required by a specific consumer during a given period of time.[1]

Construction

MDI instruments are designed in such a way that they record the base load requirement of electrical energy. They can also measure the peak load but are unable to record sudden short circuit or High motor Starting Currents. Its main construction parts are:

  1. A Dial connected with moving system
  2. A pointer on dial
  3. Reset device
  4. Fraction device
  5. Indicating pin

Maximum demand indicator is often available as a built in feature of three phase energy meters, included in a single case.

Maximum Demand is calculated by

Maximum Demand(KW)=Maximum Energy Recorded(KWh)⁄Time(hours)

References

  1. ^ Electrical Instruments & Measurements. Pakistan: Allied Book Center Urdu Bazar Lahore. 2002. p. 461.
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