SHIELDINGS ELEMENTS

Introduction

The following solutions are offered for any kind of shielding needs.

- Shield rings

- Open tapered shield ring

- Closed, wound metallized shield rings

- Flexible core shields and yoke shields

Field of Application

Shielding elements are used to define areas of uniform electrical potential at the end of the winding,

around the magnetic core or in some cases within windings.

Types

Core shields / Yoke shields

Flexible shields provide an economical means of electrostatic shielding around magnetic cores

and inside winding structures. Moreover, centre terminal exits through the tap winding can be shielded.

Flexible shields are used in power and traction transformers. With these shields, the conductive layer is

bonded between two TRANSFORMERBOARD TIV boards under high pressure. Because of

this strong construction, the metal layer is effectively protected against mechanical damage.

Closed, wound metallized shield ring

Metallized shield rings control and smooth the electrical field at the axial winding ends of power

transformers. They generally consist of a hard core of TRANSFORMERBOARD covered with a layer of

metal-foil tape. The outer insulating layer of the metallized shield ring consists of crepe paper tightly

wrapped around the ring by machine.

Open, wound tapered end compensating ring (core wound)

Metallized shield rings control and smooth the electrical field at the helical winding ends of power

transformers. Wound, metallized tapered end rings are used for spiral windings (often regulating windings)

to compensate for axial length.