Current transformer with temperature measuring device

Abstract

The invention relates to a current transformer with a temperature measuring device. The current transformer comprises a shell, an iron core, a copper coil and a terminal; the iron core is arranged in the shell; the copper coil is wound on the iron core; the shell and the iron core are of an integrated structure; the inside of the iron core is provided with a through hole which penetrates through the iron core and the shell; and the surface of the through hole is provided with a temperature sensor. According to the current transformer with the temperature measuring device provided by the invention, a thermal resistance temperature sensor is directly poured in the shell of the current transformer, the current transformer and the temperature measuring device are combined, and the integration degree is greatly improved. The current transformer can not only output secondary currents, but can also output temperature signals, thereby enriching the functions of the current transformer; the temperature sensor is directly poured in the shell of the current transformer, so that mounting parts of the temperature sensor are saved; and while a temperature sensor probe directly faces a cable head, which has a higher reliability structurally and functionally.

Description

technical field [0001] The invention relates to a current transformer, in particular to a current transformer with a temperature measuring device. Background technique [0002] The current transformer is a sensor that enables secondary equipment such as measuring instruments and relay protection in the power system to obtain primary circuit current information, and enables important electrical equipment in the power system to undertake the isolation between high and low voltage systems and the high voltage to low voltage. Transformation functions. Whether the current transformer itself works normally or not is of great significance to the safety of the power system and the normal operation of protection, measurement and other equipment. [0003] The principle of current transformer is based on the principle of electromagnetic induction. A current transformer consists of a closed core and windings. Its primary winding has very few turns, and it is connected in series in th...

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Problems solved by technology

[0007] In the prior art, the temperature measuring device of the cable head of the ring network cabinet is a separate module, and the temperature measuring device of the cable head and the current transformer are two independent devices. After the current transformer is installed, the temperature measuring device of the cable head needs to be additionally installed; Due to the limited space in the ring network cabinet, the installation of the cable head test device of the ring network cabinet is complicated, and the installation of the cable head test device is difficult to meet the design requirements. The stability of the cable head test device is poor, causing the ring network cabinet to fail to operate normally.

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