| 摘要 |
PROBLEM TO BE SOLVED: To provide a measuring instrument having a correction function capable of measuring characteristics of a current transformer or a transformer incorporated in the measuring instrument such as an insulation monitoring device independent of the classification in the measuring instrument, obtaining accurate correction values, and confirming operation of the measuring instrument in a connection state and no load state of the current transformation or the transformation used in periodic check. SOLUTION: A property monitoring device has: a test current output circuit capable of changing output current; a test current value computing means for computing a current value of test current output from the test current output circuit; a test current control means for performing feedback control of the test current value computed via the test current value computing means to a target value ; a measurement current detection circuit for measuring an output current value of the current transformer or the voltage transformer when the test current controlled to the target value via the test current control means is supplied, for storing a relationship between the output current value of the current transformer or the voltage transformer and the test current value for each target value by varying the target value of the test current via a predetermined pattern, and computing a correction coefficient for correcting a property of the current transformer or the voltage transformer based on the stored relationship. COPYRIGHT: (C)2011,JPO&INPIT
|
