| 摘要 |
<p>PURPOSE:To prevent burning of primary winding due to the rapid increase of exciting current by setting the magnetic flux density of the iron core of gas PT below 1/2 of the saturated magnetic flux density at a rated voltage. CONSTITUTION:The magnetic flux density of the iron core of gas PT is set below 1/2 (10T) of the saturated magnetic flux density at a rated voltage. By this, even if a voltage nearly twice as large as the rated voltage for gas PT is impressed, in operating a on-the-site withstand AC voltage test on a gas-insulating, sealed type switchegear of a non-effective ground system, since the magnetic flux density of the iron core of gas PT is below the saturated magnetic flux density (20T), no burning occurs to primary winding that might be caused by the rapid increase of the exciting current due to the saturation of the iron core.</p> |
