Resin Insulation Dry Type Transformer Precautions

First, although the resin insulation dry type transformer has strong moisture resistance, it is still prone to moisture because it is generally an open structure, especially the resin insulation dry type transformer produced in my country has a low insulation level (lower insulation level).

Therefore, resin insulation dry type transformers can only obtain high reliability when the relative humidity is below 70%. Dry-type transformers should also avoid long-term outages to avoid severe damp. When the insulation resistance value is lower than 1000/V (operating voltage), it means that the transformer is seriously damp, and the test run should be stopped.

Second, the dry-type transformer used for step-up in the power station is different from the oil-immersed transformer. Open-circuit operation on the low-voltage side is prohibited, so as to avoid insulation breakdown of the resin insulation dry type transformer due to overvoltage on the grid side or lightning strikes on the line, resulting in overvoltage transmission.

In order to prevent the transmission of overvoltage hazards, a set of overvoltage protection arresters should be installed on the voltage bus side of the dry-type transformer.

As one of the important power equipment in power transmission and distribution lines, resin insulation dry type transformers are more and more popular among users because of their high insulation strength, strong short-circuit resistance, environmental protection, fire prevention, explosion-proof, and maintenance-free.

Therefore, for installation technicians, it is necessary to use professional and scientific technology to do every preparation work, and to solve and summarize the problems that arise during the installation process in time to ensure the safe operation of the equipment.