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Which type of measuring instrument widely used in power system for measuring the energy?

Which type of measuring instrument widely used in power system for measuring the energy? Correct Answer Induction type

Various Measuring Parameter:

Meter Parameter Instrument used
Ammeter Current PMMC, EMMC,
MI, Hot Wire
Voltmeter Voltage PMMC, EMMC,
MI, Hot Wire,
Electrostatics Type
Power Factor Meter Power Factor Dynamometer Type,
Moving Iron type
Watt-hour Meter
(Energy Meter)		 Energy Induction Type
Wattmeter Power Dynamometer Type,
Induction Type
Frequency Meter Frequency Moving iron type,
Dynamometer Type,
Vibrating Type

Additional Information

Induction type energy meter:

An induction type meter consists of two electromagnets, called shunt magnet and series magnet of laminated construction.

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A coil having a large number of turns of fine wire is wound on the middle limb of the shunt magnet. This coil is known as voltage coil or pressure coil and it is connected across the supply mains. It has many turns and is arranged to be as highly inductive as possible. This causes the current and therefore the flux, to lag the supply voltage by nearly 90°.

An adjustable copper shading ring are provided on the central limb of the shunt magnet to make the phase angle displacement between the magnetic field set up by the shunt magnet and the supply voltage is approximately 90°.

The series electromagnet is energized by a coil which is known as a current coil and it is connected in series with the load so that it carries the load current. The flux produced by this magnet is proportional to and in phase with the load current.

The moving system essentially consists of a light rotating aluminum disk mounted on a vertical spindle or shaft. The fluxes produced by the shunt and series magnet induce eddy currents in the aluminum disc. The interaction between these two magnetic fields and eddy currents set up a driving torque in the disc.

As in energy meter instrument, we have two fluxes and two eddy currents and therefore two torques are produced by

(i) First flux interacting with eddy current produced by second flux and

(ii) Second flux interacting with eddy currents generated by the first flux

Hence in an energy meter, the energy measures in kWh and the magnitude of flux vary due to abnormal current & voltage.

Maximum torque is produced when the phase angle between these two fluxes is 90°

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