Harmonic Characteristics on the Starting of the Lag Type Operating Circuit for the High Pressure Mercury Arc Lamp

Abstract

The research relates to the starting harmonic characteristics of the lag type operating circuit for the high pressure mercury arc lamp and the way to improve the power factor in the circuit in the rated condition with a view to saving energy.
The research has been conducted in the following sequence. First, sinusoidal rated voltage is supplied at the input terminal of the lag type operating circuit for the high pressure mercury arc lamp.
(1) From the time when the rated voltage is supplied, the current, voltage, and luminous flux are measured every ten seconds till the lamp gets fully illuminated, and the operating characteristics are considered.
(2) The wave analyses of the voltage and current of distorted waves at each element are made at each moment when the lamp voltage becomes 20 V, 40 V, 60 V, 80 V and 100 V during the above mentioned starting period. The wave analyses are also made in the stable condition: 115 V. By the examination of the followings, the starting characteristics of a lamp are clarified.
(a) The vector diagrams are obtained for the voltage and current of each harmonic at each element.
(b) The effective power, reactive power, apparent power, and distorted power at each element are obtaioned.
(3) A condenser is connected in parallel with the input terminal, and investigations are made to improve the power factor of the supply voltage and current.