High-protection ammeter current transformer

Abstract

The invention relates to a high-protection ammeter current transformer, which comprises a shell, a U-shaped mutual inductance frame and a voltage sampling needle, and is characterized in that the cross section of the shell is a closed body formed by two U-shaped sections and two arc-shaped sections, one U-shaped section forms the bottom of the shell and is marked as a lower U-shaped section, the two ends of the lower U-shaped section are respectively connected with one ends of the two arc-shaped sections, and the other end of the lower U-shaped section is connected with the other end of the two arc-shaped sections. One U shape is marked as an upper U shape, two ends of the other U shape are respectively connected with the other ends of the two arc-shaped bodies, a cylindrical convex column is arranged in the shell, the cylindrical convex column and the shell are integrated, and a rectangular hole is formed in the cylindrical convex column. According to the invention, the two probe holes of the voltage sampling probe are completely embedded with the bottom conductive block after installation and are tightly embedded with each other, so that the voltage value is stable, and the problem of poor contact is effectively solved. Meanwhile, the voltage sampling needle and the shell form a compact structure.

Description

technical field [0001] The invention relates to the technical field of transformers, in particular to a high-protection electric meter current transformer. Background technique [0002] The transformer is the main current signal acquisition part of the electric energy meter, and its performance will directly affect the measurement accuracy of the electric energy meter. Because in AC lines, the influence of DC and even harmonics can produce large errors on current signals, especially under high-power loads, traditional transformers can filter their DC harmonics due to their unreasonable structure, and then This causes relatively large measurement errors in the transformer, making it difficult to maintain high-precision measurement of the current. From the structural point of view, the current output of the existing current transformer is directly inserted into the circuit under test by using a wire harness, which leads to an unreasonable design structure and inconvenient pro...

AI Technical Summary

Problems solved by technology

Because in AC lines, the influence of DC and even harmonics can produce large errors on current signals, especially under high-power loads, traditional transformers can filter their DC harmonics due to their unreasonable structure, and then Make the transformer produce a relatively large measurement error, and it is difficult to maintain high-precision measurement of the current

From the structural point of view, the current output of the existing current transformer uses a wire harness to directly insert into the circuit under test, resulting in an unreasonable design structure and inconvenient production. At the same time, the structure of the pin and the shell is inconvenient for wiring and assembly, and it is difficult to judge the accuracy of the connection circuit.

Images