Isolation transformer belongs to the safety power supply, generally used for machine repair, maintenance, protection, lightning protection, filtering function. The principle of isolation transformer is the same as that of ordinary transformer. They all use the principle of electromagnetic induction. Isolation transformers generally (but not all) refer to 1:1 transformers.

the structure of the power transformer:(1) Rectifier；(2) Filter；(3) Inverter；(4) Power factor correction:

A power transformer is a static machine used for transforming power from one circuit to another without changing the frequency. As there is no rotating or moving parts, a transformer is classified as a static device. Transformer operates on an AC supply. Transformers operate based on the principle of mutual induction.

In the power system, the role of the current transformer is to change the large current into the small current, isolate the secondary loop connected to the relay and measuring instrument from the high voltage system of the primary current, and convert the primary current to the secondary current value of 5A or 1A standards.

In conclusion, the power transformer is not a commodity but a strategically selected foundation component​ that directly influences the safety, accuracy, longevity, and field reliability of metering equipment. Its selection involves a careful analysis of isolation requirements, efficiency targets, size constraints, and the specific load characteristics of the meter's electronics. Compromising on transformer quality can lead to premature failures, measurement drift, or susceptibility to grid disturbances. Therefore, for meter manufacturers and procurement specialists, specifying power transformers from established, quality-focused suppliers like Oswell​ is a critical decision. It ensures access to components engineered with the right materials, construction techniques, and testing protocols to deliver consistent, reliable performance in the challenging real-world environments where meters operate, safeguarding the integrity of the revenue and data collection system.