The Effect Of Internal Humidity On The Operational Stability Of An Ac Reactor

In industrial electrical equipment, the ac dc reactor is a crucial electromagnetic component for suppressing harmonics and buffering transient phenomena. Composed of a silicon steel core and windings, it plays a vital role in power quality and equipment lifespan.

When ambient humidity is high or the equipment is exposed to a humid environment for extended periods, the ac input reactor internal structure absorbs moisture, potentially causing performance degradation or changes in electrical characteristics of its insulation materials, electromagnetic coils, and core materials. The thin film of moisture formed between the windings alters the local electric field distribution, increasing leakage current paths and dielectric losses, thus impacting overall equipment reliability.

When the ac output reactor internal structure comes into contact with moisture, the coil insulation varnish and other epoxy-based insulation materials undergo hygroscopic changes, increasing the risk of dielectric breakdown. Moisture penetration can also accelerate material aging, especially under repeated thermal cycling conditions, leading to faster evolution of microcracks and decreased mechanical structural stability. Humid and hot environments also pose challenges to the insulation layers between the core laminates, potentially causing permeability degradation and increased magnetic losses, affecting the equipment's frequency response and electromagnetic performance.