The high frequency transformer is the most important part of the switching power supply. The switching power supply generally uses a half-bridge power conversion circuit. When working, two switching transistors are turned on in turn to generate a 100kHz high-frequency pulse wave, and then the high-frequency transformer is used to step down and output low-voltage alternating current.

Transformers and inductors are easily confused because they have the same physical shape. There is only one rule that can be distinguished between them, the transformer is marked with "QTK", and the inductor is marked with "QHP".

The smart grid represents the next-generation power system, integrating advanced sensing, communication, and automation technologies to enhance efficiency, reliability, and sustainability. A critical enabler of this transformation is high-precision current measurement, which underpins energy metering, fault detection, and dynamic protection.

With the increasing complexity of modern electrical systems, DC-immune current transformers (CTs) have become essential for accurate current measurement in environments with DC offset or mixed AC/DC currents. The DCT105W-B3 120A CT with DC immunity represents a significant advancement in this field, offering precise current sensing even in the presence of DC components.

The 60A DC-immune current transformer (CT) is a compact, high-performance solution designed specifically for three-phase watt-hour (Wh) meters. With its single-core design, small footprint, and robust insulation, this CT is optimized for easy installation inside meter casings, making it ideal for smart meters, energy monitoring systems, and industrial power measurement applications. This article explores its key features, technical advantages, and applications in modern electrical metering.