Core structure and shape of current transformer

In my country's current current transformer market, the types produced by current transformer manufacturers are mainly electromagnetic current transformers. At the same time, the power transformer can be divided into dry type, resin casting type and other types according to the way of primary winding. The composition structure of different types of current transformers is very different.

At present, the iron core materials of the current transformers produced by current transformer manufacturers are all made of cold-rolled silicon steel sheets, alloys, microcrystalline alloys, etc. Used as an iron core at the measurement port. It is widely used and inexpensive. The remaining two alloys have the characteristics of excellent magnetic permeability, but the purchase price is quite high, and most of them are only used in current transformers that require high precision!

The commonly used core shapes of current transformers produced by current transformer manufacturers include laminations, rings, openings, etc.

a. Laminated iron core

The cold-rolled silicon steel sheet is divided into strips along the direction of the magnetic line, and then the divided cold-rolled silicon steel sheets are stacked. In most cases, the laminated core is only used for less than 30 It is used on a small current transformer of 5000 volts.

b, the beginning of the iron core

The open iron core in the current transformer is also called the air-gap iron core. This iron core is made by painting the wound iron core under vacuum conditions or after the epoxy resin is solidified, and then cutting it. tool to cut it into two or more parts. Stainless steel is used to form a complete iron core at the cutout, and the initial iron core is mainly used on current transformers that require transient characteristics.