Open-close type current transformer

Abstract

The invention discloses an open-close type current transformer, comprising a shell, an iron core, a coil and a connecting terminal. The iron core consists of two iron cores which can be assembled into a square ring shape; the shell is a hollow square shell and consists of an upper shell and a rectangular lower shell; the front surface and the rear surface of the shell are inverted concave shape; the inner part of the upper shell is encapsulated with a big iron core; the inner part of the lower shell is encapsulated with a small iron core; and the upper shell and the lower shell are fixed by a connecting pawl and screws which are convenient to be disassembled. The transformer does not disassemble a circuit to be measured when in maintenance and exchanging, has convenient disassembling and high working efficiency and simultaneously has the protecting function of preventing electrical larceny, easy manufacture, low cost and wide market prospect.

Description

technical field [0001] The invention relates to electrical equipment, in particular to a split current transformer which is convenient for maintenance and replacement. Background technique [0002] At present, to measure current and electric energy in a low-voltage AC circuit, a current transformer is placed on the power line to sample the line current. The current current transformer mainly includes a shell, a protective cover, a coil, an iron core, and a terminal block. Its structure has the following defects: 1. When the current transformer is regularly maintained and replaced, the primary circuit to be tested in the indoor switch cabinet must be replaced. Take it apart, so the work efficiency is low and troublesome. 2. When the current transformer is used as a metering product, it is required to protect the rated current ratio. However, most of the secondary wiring of the existing domestic low-voltage current transformer is open, and there is no anti-theft protection co...

AI Technical Summary

Problems solved by technology

The current current transformer mainly includes a shell, a protective cover, a coil, an iron core, and a terminal block. Its structure has the following defects: 1. When the current transformer is regularly maintained and replaced, the primary circuit to be tested in the indoor switch cabinet must be replaced. Take it apart, so the work efficiency is low and troublesome

2. When the current transformer is used as a metering product, it is required to protect the rated current ratio. However, most of the secondary wiring of the existing domestic low-voltage current transformer is open, and there is no anti-theft protection cover, which is easy to be replaced. current ratio, thereby obtaining illegal power

3. Most of the iron cores of existing transformers are annular iron cores, and the winding of the coil is inconvenient. When the iron core is heavy, after this process, it is easy to cause damage to the secondary coil and increase the number of unqualified products.

4. Most of the existing transformers with square iron cores are lamination structures. The end faces of the laminations are not flat enough, the lamination coefficient is low, and the magnetic flux leakage is large. Correspondingly, the cross-sectional area of ​​the iron core and the copper material of the secondary winding are increased. , increasing the cost

5. Most of the existing domestic low-voltage current transformers have only one screw connection on the secondary terminal, which cannot meet the requirements of customers for various connection methods

6. Most of the existing domestic low-voltage transformers are installed on the electrical installation board with the bottom support frame, and the installation method is single

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