On-line monitoring type intelligent current transformer

The invention discloses an on-line monitoring type intelligent current transformer comprising a current transformer body, a box body, and a combined sensor. The combined sensor is integrated with a partial discharge sensor and a dielectric loss sensor and is capable of testing partial discharging and dielectric losses. The sensor is arranged inside the box body and the box body is arranged at the lower end of the current transformer. The sensor and the current transformer are based on an integrated design, interfaces unified and standardized, and live testing is realized, so that the operation and maintenance costs of the grid are lowered. The current transformer comprises an end screen and a secondary end screen that form a dual-end-screen structure, so that testing of partial discharge and dielectric losses of the current transformer in electrified and non-electrified states is realized. Moreover, the testing processes are not affected; reliability of grounding of the end screen of the current transformer i