Working principle of transformer core

The working principle of the mutual inductor is the same as that of the transformer, both of which operate on the principle of electromagnetic induction, so most of the Iron Cores used in transformers can be used for the mutual inductor core. Nanhai Silicon Iron Core Manufacturing Co., Ltd. produces ring cores, C-type cores, step cores, rectangular cores, sheared/laminated cores, EI-type cores, open-wound cores and special-shaped cores, which can be used in both transformers and mutual inductors.

The permeability of the transformer corehas a great influence on the measurement accuracy of the transformer. C-type core, ring core, ladder core, Rectangular Core, etc. are used as winding cores. They use oriented cold-rolled high-quality silicon steel materials to ensure the consistency of the magnetic flux direction and the grain orientation of the silicon steel sheet. They are used in transformers and have the advantages of safety, high efficiency, low noise, low loss, strong short-circuit resistance, and strong pressure resistance. They have always been commonly used product components in transformers.

The main function of the transformer is to reduce the AC voltage and high current proportionally to a value that can be directly measured by the instrument, which is convenient for direct measurement by the instrument, and at the same time provides power for relay protection and automatic devices. The quality of the transformer determines whether the person and equipment are safe, and the key role of the iron core in the transformer determines its status.

Unlike the magnetic flux density of transformer core (transformer is generally designed to be less than 1.7T), the magnetic flux density of transformer core is generally designed to be relatively low, about 0.08-1T. C-type transformer core is generally made of cold-rolled oriented silicon steel material, rolled and cut, and its structure is an open structure with two halves of C-shaped spliced ​​into a closed circuit. It is especially suitable for medium and low frequency electromagnetic components. In addition to being used in transformers, it is also used in transformers, reactors, and chokes in electronic equipment.

Excitation current is the main cause of low-voltage current transformer errors (reduce excitation current). In addition, it is also closely related to the design and production of the core itself. Starting from the core, the following methods can be used to reduce errors: First, use high magnetic permeability materials to make the core, because the magnetic properties of the core not only affect the ratio difference and angle difference, but also the saturation multiple. Secondly, increase the core cross-section, shorten the magnetic path length, and increase the number of coil turns. Increasing or decreasing the core cross-section or coil ampere-turns will increase or decrease the saturation multiple accordingly. When increasing the core cross-section or coil ampere-turns to improve the ratio difference and angle difference, the impact on the saturation multiple needs to be considered. "