A cover unit for a converter head of a high-voltage converter device includes a flat, preferably planar, cover element and an RIV shielding device peripherally surrounding the cover element for shielding radio interference voltage. The RIV shielding device is formed by a plurality of RIV shielding elements distributed peripherally on the edge of the cover element. The RIV shielding elements each have a substantially cylindrical shape, in particular a capsule shape. A corresponding converter head and a corresponding high-voltage converter device are also provided.

The present invention refers to HV apparatus, in particular a HV dry current transformer, insulated with an insulating gel, or a voltage transformer, insulated with an insulating gel. The dry HV current transformer comprises at least two electrically conductive elements i.e. a head transformer cover, a head housing base, a core casing and a primary conductor. In the dry HV current transformer at least one of the electrically conductive elements has a coating made of solid insulating material separating the surface of the conductive elements from the insulating gel and adapted for limiting the electron emission from the conductive elements into the insulating gel. The voltage transformer comprises a bottom external housing, a bottom support flange, a core. In the voltage transformer at least one of the electrically conductive elements has a coating made of solid insulating material separating the surface of the conductive elements from the insulating gel and adapted for limiting the electron emission from the conductive elements into the insulating gel.

The present invention refers to HV apparatus, in particular a HV dry current transformer, insulated with an insulating gel, or a voltage transformer, insulated with an insulating gel. The dry HV current transformer comprises at least two electrically conductive elements i.e. a head transformer cover, a head housing base, a core casing and a primary conductor. In the dry HV current transformer at least one of the electrically conductive elements has a coating made of solid insulating material separating the surface of the conductive elements from the insulating gel and adapted for limiting the electron emission from the conductive elements into the insulating gel. The voltage transformer comprises a bottom external housing, a bottom support flange, a core. In the voltage transformer at least one of the electrically conductive elements has a coating made of solid insulating material separating the surface of the conductive elements from the insulating gel and adapted for limiting the electron emission from the conductive elements into the insulating gel.

An instrument transformer for high current and/or high voltage conversion has a housing and at least an active part, which is electrically insulated by an isolation material. The isolation material includes particles. A method for the instrument transformer includes the filling of a housing of the instrument transformer with particles, particularly with particles of paper material and/or cellulose, which were impregnated by an insulating fluid, particularly mineral oil and/or a synthetic oil, and/or ester, particularly vegetable esters.

A protection device protects an AC device, in particular an inductive voltage converter, electrically connected to an AC line, from damage caused by direct currents flowing in the AC line. In this case, at least one current transfer coil, which runs around a magnetic core section of a magnetic core, is connected to the AC line in parallel with the AC device.

A protection device protects an AC device, in particular an inductive voltage converter, electrically connected to an AC line, from damage caused by direct currents flowing in the AC line. In this case, at least one current transfer coil, which runs around a magnetic core section of a magnetic core, is connected to the AC line in parallel with the AC device.

A gas-insulated measurement transformer for measuring high voltages has a plurality of transformer arrays arranged in a fluid-tight housing for transforming a high voltage to a measurement voltage. Each of the arrays has an active part, a high voltage contact guided through the housing, a fixed contact that is electrically connected to the active part, a movable contact that is electrically connected to the fixed contact, and a separating device, which can be operated from outside the housing, for establishing or separating a connection between the movable contacts and the high voltage contacts. The separating device has a connecting element connecting the movable contacts to one another, and an adjustment device for moving the connecting element in an actuating direction, wherein the fixed contact is configured as a guiding device for the movable contact in an actuating direction.

A gas-insulated measurement transformer for measuring high voltages has a plurality of transformer arrays arranged in a fluid-tight housing for transforming a high voltage to a measurement voltage. Each of the arrays has an active part, a high voltage contact guided through the housing, a fixed contact that is electrically connected to the active part, a movable contact that is electrically connected to the fixed contact, and a separating device, which can be operated from outside the housing, for establishing or separating a connection between the movable contacts and the high voltage contacts. The separating device has a connecting element connecting the movable contacts to one another, and an adjustment device for moving the connecting element in an actuating direction, wherein the fixed contact is configured as a guiding device for the movable contact in an actuating direction.

An explosion-proof inductive voltage transformer (IVT) of the type comprising: i) a high voltage section that receives a high voltage current, limits and insulates the high voltage current to be transformed and reduces its electrical stress; and, ii) a voltage transforming section connected to the high voltage section and contained in an insulation body in order to protect the elements of the voltage transforming section and reduce the impact of explosions in case of electrical failure, wherein the voltage transforming section comprises means for reducing the voltage of the high voltage current to a low voltage and electric transmission means that transmit a resulting low voltage current to a low voltage distribution line; wherein the voltage transforming section of the IVT further comprises shock mitigation means comprising at least one hollow section located opposite the high voltage section that, during an electrical failure causing an explosion, direct the gases and shockwave of the explosion towards the hollow section, thereby reducing the damage caused by the explosion to the IV transformer and its surroundings; provides an explosion-proof inductive voltage transformer easy to install and with a low cost manufacture.

An instrument transformer for high current and/or high voltage conversion includes a housing and at least an active part, which is electrically insulated by an isolation material. The isolation material includes or is a paste and/or pulp. A method for producing the instrument transformer includes the filling of a housing of the instrument transformer with paste and/or pulp, particularly with paste and/or pulp including paper material and/or cellulose, solved in a solvent, particularly at least one ionic liquid.