HARMONIC ANALYZING DEVICE FOR ELECTRIC POWER

摘要

PURPOSE:To output the harmonic contained value of the secondary output of each transformer, after converting it to a value corresponding to the primary input of each transformer, by providing the transformation comparing means of a digital switch. CONSTITUTION:The titled device is provided with a transformation ratio setting means 6, a potential transformer 7, a potential current transformer 8 and a central processor CPU, etc. In this state, the transformation ratio of the transformer 7 and the current transformer 8 is set by the means 6 and a measurement start command is given to an analyzing means. Subsequently, the CPU applies an input switching signal to multiplexers 3a, 3b through an address data bus AB and controls them. Next, an input to be measured is selected and a measuring input is given to the CPU from a voltage input line LV and a current input line LC. In this case, the CPU inputs the set transformation ratio of the transformer 7 or the current transformer 8 from the means 6 through the data bus AB. Based on this inputted transformation ratio, the CPU calculates and outputs the harmonic contained value corresponding to the primary input of the transformer 7 and the current transformer 8.