• The Transactions of the Korean Institute of Electrical Engineers B
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• v.48 no.11
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• pp.587-596
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• 1999

The use of Switching elements in power systems causes the current or voltage to involve harmonic waves. Harmonics bring about registration errors of the equipment for measuring power. In case the induction watthour meter designed on sinusoidal source is used in the measurement of power with harmonics, the precise measurement of power has many problems because harmonics cause a decrease of power factor and vibration by the unstable driving force on the aluminum disc. In this paper, analysis and test results on the harmonic sensitivity of an induction watthour meter is reported when the input voltage and current with harmonics were supplied to single-phase watthour meter.

• Proceedings of the KIEE Conference
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• 1998.11a
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• pp.31-33
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• 1998

The sensitivity of induction watthour meter was reviewed by characteristic tests under the effects of each input harmonics and the variation of power factor of inverter input/output terminal. This paper presents experimental data on the characteristics of induction watthour meter under the effect of harmonics.

• Proceedings of the KIEE Conference
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• 1998.07a
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• pp.58-60
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• 1998

The precise measurement of consumed power during the given time is very important in the energy management aspect. Up to days, induction watthour meter has been designed for use in the alternating circuits in which the voltage and current are essentially sinusoidal. The use of switching elements in power system causes the current or voltage involving harmonics. Therefore the registration error is caused by harmonics in the equipment for measuring power. This paper presents the registration error of the induction watthour meter in the presence of harmonic distortion. The accuracy of a watthour meter on loads in which the input source is not sinusoidal is investigated. And the effects of individual harmonic are reported by experiment.

• Proceedings of the KIEE Conference
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• 1997.07a
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• pp.77-79
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• 1997

An induction watthour meter was designed for use on circuits in which the voltage and current are essentially sinusoidal. As the application of switching devices has been increased, the waveforms of voltage and current have involved the harmonics. Therefore, power energy involving voltage and current with the harmonics is supplied to the system and the registration error of watthour meter is existed. In this paper, we experimented on the error of watthour mesurement under the sinusoidal and nonsinusoidal input source.

• Proceedings of the KIEE Conference
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• 1997.11a
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• pp.25-27
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• 1997

The precise measurement of consumed power for a given time is very important in the energy management aspect. Up to days, most power meter has been used and designed for use on circuits in which the voltage and current are essentially sinusoidal. Recently the increase of switching element in power system causes the current and voltage with harmonics. Therefore, power energy involving harmonics is supplied to the system and the error of power measurement of watthour meter is existed. In this paper, we present a characteristic analysis by input frequency variation and analytical basis of induction watthour meter considering harmonics.

• Proceedings of the KIEE Conference
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• 1998.07a
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• pp.290-292
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• 1998

The driving torque acting on a rotatable disk of watthour meter is proportional to the effective power. The aim of this paper is to show how the driving torque on a disk can be measured by a LVDT transducer. This driving torque is obtained by the theoretical computation. To verify the computated result, the LVDT as torque transducer, was used. A comparison is made between computed and measured torques.