| 摘要 |
The invention is intended for measuring an alternating current without interrupting a current-conducting conductor of an electric circuit. The current transformer comprises a primary winding formed by a current-conducting conductor of a circuit, a magnetic circuit comprising at least two concentrically coincident annular cores, and a secondary winding, which surrounds the magnetic circuit over part of the perimeter thereof. In accordance with a first variant, the magnetic circuit cores are arranged in an annular framework, which is designed with the possibility of rotation of at least one of the cores about the common geometrical axis of said cores. The secondary winding is arranged on the annular framework. The magnetic circuit cores and the annular framework are formed with radial gaps which provide for the passage of the current-conducting conductor of the circuit. In the current transformer in accordance with a second variant, one of the annular cores in the form of a hollow ring with the possibility of rotation of at least one of the annular cores arranged in said hollow ring about the common geometrical axis of said annular cores acts as the framework. In order to bring the current transformer into a working position, at least one of the cores is rotated through part of a full revolution about the common geometrical axis of said cores. |
