Hv dry instrument transformer

The subject of invention is a HV dry instrument transformer based on a new type of dry insulation system. High-voltage instrument transformer has a form of current transformer (1) or a voltage transformer (21). The column insulating body (1 1 ) or (29) of the instrument transformer has a form of a dry capacitor bushing wound as a block of spacer sheet (9) or (30), respectively. The current transformer (1) has a head insulating body (13) for electrical insulation of the secondary winding assembly (8) from the primary winding conductor (12). For the current transformer (1) the head insulating body (13) has a form of a capacitor bushing and is in contact with the insulating member (18). The voltage transformer (21) has a primary winding (24) which is in contact with the insulating member (32). The column insulating body (11) or (29) has an impregnation material having substantially the same coefficient of thermal expansion as the material of the insulating member (18) or (32), respectively.