電気機器の安全性を高めるための巻線

安全性が強化された電気機器において, 防爆モーターなど, 変圧器, 電磁線, 蛍光灯用安定器など, 一部に内部巻線が含まれています. これらの巻線の要件, 機械的にも電気的にも, 標準巻線よりも高い.

一般的に, これらのコイルを巻くために使用される絶縁ワイヤは二重絶縁されている必要があります, and the coil’s rated diameter must not be less than 0.25mm.

For the enameled wire used in winding these coils, it is recommended to use GB/T6109.2-2008 “Polyester Enameled Round Copper Wire, Class 155,” ギガバイト/トン 6109.5-2008 “Polyester-imide Enameled Round Copper Wire, Class 180,” ギガバイト/トン 6109.6-2008 “Polyimide Enameled Round Copper Wire, Class 220,” or GB/T6109.20-2008 “Polyamide-imide Composite Polyester or Polyester-imide Enameled Round Copper Wire, Class 220.”

さらに, 学年 1 enameled round copper wire as specified in these standards can be used, provided it passes the relevant tests outlined in the standards.

After winding, an appropriate impregnating agent should be used to enhance the insulation properties of the windings.

The impregnation process should follow the manufacturer’s specified method, using techniques like dipping, trickling, or vacuum pressure impregnation (VPI) to fill the gaps between winding wires and ensure strong adhesion. If the impregnating agent contains solvents, the impregnation and drying should be performed twice to allow solvent evaporation.

一般的に, methods like spraying or coating for insulating windings are considered unreliable for 防爆電気機器. Adequate attention should be given to this in engineering practice.

さらに, for high-voltage windings, the impregnated windings should be treated with anti-corona paint to prevent additional hazards caused by corona discharges.

In enhanced-safety electrical devices, whether motors, electromagnetic coils, or other equipment’s coils, they should generally be equipped with 温度 protection devices to prevent exceeding limit temperatures under normal operation or recognized abnormal conditions.

If a winding does not exceed the limit temperature under continuous overload (such as a motor rotor lock), or if a winding is not subject to overload (like a ballast for fluorescent lamps), then it does not require a temperature protection device.

When enhanced-safety electrical equipment is equipped with temperature protection devices, these can be installed either internally or externally. Regardless, the protection device should have the appropriate 防爆型 and should be assessed in conjunction with the protected equipment.