Overview:

Current transformer coils for GIS are used in 66kV-500kV SF6 enclosed combined electrical appliances for current and electrical energy measurement and relay protection.

Structure introduction:

The transformer wire circle adopts high permeability cold-rolled silicon steel sheet or microcrystalline alloy material, and the secondary winding adopts polyimide enameled wire with high strength, high temperature resistance and thick paint film, and polyester film is used as the interlayer Insulation, high insulation strength.

The secondary winding is packaged by a double-head winding machine, which can complete the winding of the insulation and the wire at the same time, the number of turns of the wire, and the tension program control, which avoids the uneven tension of the wire and the error of the number of turns during the manual winding process; The DC resistance difference of the same batch of coils is small.

Polyester film is used for interlayer insulation, with a high withstand voltage of 10kV/mm

The windings are wrapped with high-temperature resistant PTFE tape and are cast with saturated ring chlorine resin, which has high electrical insulation strength and excellent heat resistance.

The secondary coil is poured into the metal casing with epoxy resin material. After curing, the coil and the metal casing form a solid whole, which ensures that the secondary coil will not be perturbed, rubbed, misplaced, or damaged during transportation. .