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Damp electrical steel will cause multiple faults and performance degradation of transformer cores. Humidity destroys steel surface state and internal operation environment.

Dampness firstly damages electrical steel insulating coatings. Moisture erodes surface coatings and causes peeling and bubbling. Coating failure leads to interlayer insulation performance decline.

It causes interlayer short circuit and increased eddy current loss. Failed insulation cannot isolate steel layers. Local short-circuit loops generate extra heat and loss.

Damp steel surfaces are prone to rust and oxidation. Rust layers destroy flat steel structure. It increases core magnetic resistance and unbalanced vibration. Transformer noise rises obviously.

It reduces core overall insulation resistance. Moisture forms conductive micro-layers on steel surfaces. The whole core insulation level decreases. It increases electric leakage risks.

Long-term dampness accelerates internal insulation aging. Core humidity conducts to surrounding insulating paper and paint. It causes overall insulation aging of transformers.

Serious dampness may trigger equipment partial discharge faults. Insulation defects and humidity induce discharge phenomena. It endangers transformer operation safety.

Drying treatment can relieve slight damp problems. Severe damp and rusted electrical steel must be replaced. It avoids hidden operational dangers.

In short, electrical steel dampness damages transformer insulation, loss and safety performance. Strict warehouse moisture-proof and pre-installation drying are essential.