HV instrument transformer

摘要

The subject of invention is a HV instrument transformer based on a new type of combined dry insulation system. High- voltage instrument transformer has a form of current transformer (1) or a voltage transformer (21). The current transformer (1) has a head insulating body (7) having a form of a bushing for electrical insulation of the secondary winding assembly (5) from the primary winding conductor (6), the head insulating body (7) being placed within a conductive encapsulation (12) and being in contact with the insulating member (15). The insulating member (15) is made of an elastic compressible material or an elastic conformable material which tightly adheres to matching outer surfaces of the head insulating body (7), the column insulating body (13), a winding shield (10) and to the inner surface of the conductive encapsulation (12) of the current transformer (1), whereas for the voltage transformer (21) the insulating member (30) is made of the same material as for the current transformer (1) and the insulating member (30) tightly adheres to matching outer surfaces of the primary winding (24), column insulating body (28) and to the inner surface of the conductive encapsulation (26).