Electronic current transformer and on-line energy-receiving device of high-voltage side of electronic current transformer

Abstract

The invention discloses an electronic current transformer and a high-voltage side on-line energy-receiving device of the electronic current transformer. The electronic current transformer and the on-line energy-receiving device of the high-voltage side of the electronic current transformer comprises a high-voltage side electricity-using unit and a high-voltage side energy-receiving device for supplying electricity to the high-voltage side energy-receiving device. The high-voltage side on-line energy-receiving device comprises a shielding shell, wherein an iron core and a secondary winding are internally arranged in the shielding shell, the secondary winding is winded on the iron core, a leading-out terminal of the secondary winding is connected on a connecting terminal externally arranged on the shielding shell, an annular laminated core is adopted as the iron core, a group of magnetic valves is arranged on the periphery of the iron core, and a narrow groove is arranged on the magnetic valves and extends along the radial direction, and penetrates through the front end surface and the rear end surface of the iron core along the radial direction. Because the group of magnetic valves is arranged on the iron core, not only the problem that when the current of a bus is large, a traditional current transformer can not stably obtain energy with large power because of saturation is solved, but also upper limit of a current dead zone can be increased to more than 20000A.

Description

technical field [0001] The invention belongs to the technical field of electric power systems, and in particular relates to an electronic current transformer and an online energy harvesting device on the high-voltage side thereof. Background technique [0002] In modern power systems, electronic transformers are key equipment for monitoring the operating status of primary equipment and systems. Among them, the electronic current transformer is divided into active type and passive type according to whether the high-voltage side needs power supply. With the promotion of microelectronics technology and optical fiber technology, active electronic transformers with relatively mature technology, reasonable cost and good stability have been paid attention to. Active electronic current transformers have excellent insulation performance and no magnetic saturation. Excellent characteristics, adapt to the needs of large capacity, high voltage level and automation development of power ...

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Problems solved by technology

[0005] Chinese patent CN101309057A discloses an ultrasonic energy supply device. Although the energy supply power is relatively large, the structure is complicated and the working reliability cannot be guaranteed.

[0007] Chinese patent CN201219065Y discloses an active electronic photoelectric current transformer hybrid energy supply device, which uses two online energy-taking current transformers to take into account the minimum and maximum bus current limit conditions, and uses laser energy supply technology to solve the current The problem of dead zone, the structure of this device is relatively complex and the size of the power supply is not specified

[0008] Chinese patent CN 202352507 U discloses an energy supply device for the high-voltage side of an electronic current transformer. The device adopts a combination of coil energy acquisition and laser energy supply. When it is large, it will be difficult to obtain high-power energy stably due to saturation

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