Safety Hazards Of Dry-type Transformers In Humid Environments

dry resin transformer faces several risks when operating in a humid environment. High humidity can negatively impact insulation performance, leading to partial discharge and accelerated insulation aging. If the dry type is in a high-humidity environment for a long time, its internal windings may absorb moisture, causing a decrease in insulation resistance, which may lead to electrical faults or even shutdown accidents.

The Impact of Humidity on Insulation Systems

The insulation system of equipment like dry type auto transformer includes winding insulation and inter-slot insulation. Under high humidity conditions, moisture from the air can penetrate the insulation materials.

• Moisture Absorption in Winding Insulation: After absorbing moisture, the winding insulation resistance decreases, making it prone to partial discharge and leading to insulation degradation.

• Inter-Slot Insulation Degradation: Moisture absorption and expansion of inter-slot insulation can cause winding compression and gap changes, increasing thermal stress.

• Surface condensation: Condensation on the core and outer casing increases the risk of short circuits and affects the operational stability of the dry type cast resin.

In high humidity environments, the insulation problems of dry type electrical transformers equipment develop progressively. Initially, it may only be a decrease in insulation resistance, but long-term accumulation may lead to serious damage.

Electrical Safety Risks in High Humidity Environments

The electrical performance of dry-type transformers is sensitive to ambient humidity. Moisture affects the surface of conductive components, causing additional stress on electrical clearances, which may lead to the following:

• Increased short-circuit current

• Increased partial discharge frequency

• Accelerated heat buildup

These factors can shorten the lifespan of dry-type transformers and increase the risk of equipment downtime. Monitoring the insulation resistance and partial discharge status of dry-type transformers is particularly important in high humidity environments.