| 摘要 |
An insulation specimen (10) may be analyzed by removing any absorbed charge from the specimen (10). Test voltage E is applied through system resistance R. ITOT is sensed at time intervals occurring at selected times multiplied by any three points in a power series while maintaining E constant and RIR is calculated from the formula: <IMAGE> and displayed. Apparatus consists of a high voltage power supply (12), current sensing means (14) and specimen terminals for connecting an insulating specimen (10) across the power supply (12) in series with the current sensing means (14). A voltage comparator (16) is connected across the specimen terminals to sense effective voltage across the specimen (10). Computation means (18) receives inputs from timing means (18), the current sensing means (14) and the voltage comparator (16) and is used to calculate insulating current using a formula involving elapsed time measurements of total current through the insulation specimen to calculate insulation current and the insulation resistance of the insulation specimens. Means (18, 2a) is employed to adjust the high voltage direct current power supply (12) and display means (22) permits display of insulation current and insulation resistance readings. |
