The Structure of Micro Precision Current Transformers
Jul 21, 2026
A Micro Precision Current Transformers consists of a primary winding, a secondary winding, an iron core, insulation between the windings and the core, and a casing.
Micro precision current transformers used to commonly use 1J85 splashed ink alloy wound into a ring-shaped iron core, but thanks to the industry development, currently those Micro Precision Current Transformers mainly use of nanocrystalline core. Common pressure pressed thin strips models include 1k107 and 1k107B. If the Micro precision current transformers performance requirements are not high, silicon steel sheets and ferrites can be used as a replacement choose. The advantage of a ring-shaped magnetic core is that it has no air gap and good magnetic properties. Especially if the winding is uniform during the winding process, the leakage magnetic flux is very small.
The insulation between the ring core and the winding is generally achieved by adding a plastic protective shell to the core. The protective shell has two functions, insulation and protection of the core, which the protection of the core is the most important.
The core material is highly sensitive to stress, and its magnetic properties will change when subjected to stress. Adding a protective shell can reduce stress during winding, thus it is important to handle the transformer with care during production. However, ultrafine crystalline materials are already very brittle and require even more protection. After winding the windings, the transformer is encapsulated in the casing. Of course, there will be many inspection processes throughout the entire production process.
Micro current transformers are divided into single turn and multi turn types according to the primary winding.
The primary winding of a single turn miniature current transformer has only one turn.
Rod type: Steel tube copper bars are integrated with the transformer housing through the iron core window (such as micro current transformers used in some electronic meters).
Busbar type: The iron core window is retained, and the busbar passes directly through the iron core window. For measuring small currents, the busbar can also be wound around the iron core window for 2 or 3 turns to obtain a smaller current ratio.
Multi turn miniature current transformers have multiple turns of primary winding, such as the 103105 series current type miniature voltage transformers.
The function of potting adhesive is to encapsulate and insulate, and the commonly used material is epoxy resin+curing agent.
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