The present invention relates to a high-voltage insulated adaptor (100) for application at a point of connection between a piece of high-voltage electrical equipment (6) and at least one measuring, control and protecting means (8), which allows connecting the measuring, control and protecting means (8) with at least one bar (10) of the main set of bars of the high-voltage electrical equipment (6), regardless of the type of element (5) for electrical connection existing in the high-voltage electrical equipment (6), where the adaptor (100) additionally comprises at least one anchoring means (9) securing the installation of the assembly formed by the insulating body (1) and the measuring, control and protecting means (8) on the bushing (5) for electrical connection corresponding to at least one bar (10) of the main set of bars of the high-voltage electrical equipment (6).