| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a testing device capable of measuring excitation characteristics of a bushing CT quickly when a generator is in a steady operating state even during operation, namely in an operating state of stably operating with a fixed load. <P>SOLUTION: The testing device includes: a current transformer 1 fitted to the bushing of the generator; a variable load resistor 5 connected to the secondary side of the current transformer; an ammeter 3 for measuring an inflow current to the variable load resistor; a voltmeter 4 for measuring voltage across the variable load resistor at an end extremely close to the current transformer; and a data processor 6 for processing and storing a resistance value of the variable load resistor, and measurement results of the ammeter and voltmeter. In a state where the generator is operating stably with a fixed load, a change in the measurement value of the voltmeter to the amount of decrease in the measurement value of the ammeter when increasing the value of the variable load resistor is set to be approximate excitation characteristic of the current transformer, and the approximate excitation characteristic and the excitation characteristics of the current transformer measured in advance are compared by the data processor, thus determining the presence or absence of abnormality in the current transformer. <P>COPYRIGHT: (C)2010,JPO&INPIT</p> |
