| 摘要 |
PURPOSE:To compensate the difference of the conditions of cooling, and to measure the temperature of the winding accurately at all times by controlling currents flowed through pseudo winding mounted for measuring the temperature of the winding in response to the drive of a motor for cooling in the stationary induction apparatus with the motor for cooling. CONSTITUTION:The winding of the stationary induction apparatus is cooled by insulating coil. Said winding is connected in series with the primary winding 401 of a current transformer 4, secondary winding 402 is connected to the mimic winding 5, and the temperature of the winding 5 is detected by a temperature detecting element 6 and displayed 7. A signal contact 13 for control is closed by the drive signals of the motor 8 for cooling, a relay 9 is energized and a main contact 9A and an auxiliary contact 9a are closed, the motor 8 is driven, and the induction apparatus is cooled by a fan. A shunt resistor 15 is connected in parallel with the winding 5 at the same time, and the winding 5 is compensated when cooled by air flow. A motor 11 for cooling is driven similarly by drive signals under this condition, cooling oil is circulated, the induction apparatus is cooled while a shunt resistor 16 is connected in parallel, and the winding can be compensated when oil fed is cooled by air flow. |
