Iron core coil type current transformer with high detection precision and electric leakage detection device

Abstract

The invention provides an iron core coil type current transformer with high detection precision and an electric leakage detection device. The high-precision iron core coil type current transformer comprises a first iron core group and a second iron core group, wherein both the first iron core group and the second iron core group include a first iron core and a second iron core which form a circular ring after being folded, both the first iron core and the second iron core include a plurality of long iron core sheets and short iron core sheets which are arranged at intervals, the folding part of the short iron core sheet of the first iron core and the long iron core sheet of the second iron core is provided with a first air gap, the folding part of the long iron core sheet of the first ironcore and the short iron core sheet of the second iron core is provided with a second air gap, a connecting line of the first air gap at one end and the second air gap at the other end passes throughthe center of the iron core group, the first air gap of the first iron core group is perpendicular to the second air gap of the second iron core group, and the second air gap of the first iron core group is perpendicular to the first air gap of the second iron core group. The electric leakage detection device comprises an electric leakage detection terminal provided with the high-precision iron core coil type current transformer and a receiving terminal.

Description

technical field [0001] The invention relates to the technical field of leakage detection, in particular to an iron core coil type current transformer and a leakage detection device with high detection accuracy. Background technique [0002] At present, in the power system, the current transformer is an instrument for measuring line current, and the commonly used current transformers include electronic current transformers and electromagnetic current transformers. [0003] As an electronic current transformer for metering, its accuracy level is generally 0.2, and its measurement accuracy is at the ampere level. And when the user's residual current reaches 35mA, that is, the action value of the lowest gear of the home insurance and each leakage protector, the measurement accuracy of the general electronic current transformer is difficult to meet the use requirements. Therefore, as a standard current transformer for online calibration, its accuracy level must be at least bette...

AI Technical Summary

Problems solved by technology

The traditional method is to use soft magnetic materials with high magnetic permeability and low eddy current loss as the iron core, reduce the length of the magnetic circuit, increase the cross-sectional area of ​​the iron core to increase the number of turns, etc. to reduce the excitation current, but the high magnetic permeability The material is easy to saturate, the length of the magnetic circuit cannot be reduced wirelessly and must meet the actual needs, increasing the core area not only increases the cost, but also makes the current transformer bulky and heavy so that it is not easy to install

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