CN202549603U

CN202549603U - High-precision zero sequence current transformer

Info

Publication number: CN202549603U
Application number: CN2012201811715U
Authority: CN
Inventors: 金波; 何斌; 闵文杰; 石艳君
Original assignee: HUBEI TIANRUI ELECTRONIC CO Ltd
Current assignee: HUBEI TIANRUI ELECTRONIC CO Ltd
Priority date: 2012-04-26
Filing date: 2012-04-26
Publication date: 2012-11-21
Anticipated expiration: 2022-04-26

Abstract

The utility model relates to a high-precision zero sequence current transformer which comprises a transformer shell, transformer magnetic cores arranged in the shell and windings on the magnetic core, wherein the quantity of the transformer magnetic cores in the shell and the windings on the magnetic core is 3, and the transformer magnetic cores in the shell and the windings on the magnetic core are evenly distributed in the shell; the current of each phase in a three-phase motor can be monitored by the arranged current transformer for motor protection, the starting protection, the open-phase protection, the lock-rotor protection, the short-circuit protection and the three-phase unbalance protection of the motor are realized, and the safe operation of the motor is realized. The transformer adopts the three-phase integrated design and has compact structure and convenience for installation.

Description

High accuracy zero sequence current transformer

Technical field

The utility model relates to electronic devices and components field or electronic monitoring and field of measurement, especially a kind of zero sequence current mutual inductor.

Background technology

At present; On the market the ZCT that extensively adopts constitute by transformer casing and the transformer core and the winding on the magnetic core that are placed in the shell; Because earth current is less; It is bigger that the ZCT of this kind structure is measured error, even cause the ZCT can't operate as normal, stayed hidden danger to power grid security.Thereby be necessary to improve on this basis.

The utility model content

The purpose of the utility model provides a kind of sensitive high accuracy zero sequence current transformer.

The technical scheme of the utility model is achieved in that

A kind of high accuracy zero sequence current transformer is provided, is made up of transformer casing and the transformer core and the winding on the magnetic core that are placed in the shell, it is characterized in that: said magnetic core adopts the iron based nano crystal soft magnetic material to process.

Through more than high accuracy zero sequence current transformer after being provided with, measuring current range is 0 to 1 peace, precision can reach 0.2%.This instrument transformer can detect the small and weak electric current that passes through on the tested lead; The output signal can directly insert computer real-time and monitor, and therefore, this instrument transformer also has the function of real-time monitoring except the function that realizes general zero sequence current mutual inductor ground protection.

Description of drawings

Fig. 1 is the utility model contour structures floor map.

Fig. 2 is the plan structure sketch map of Fig. 1.

Fig. 3 is the electrical schematic diagram of the utility model.

Embodiment

Embodiment below in conjunction with accompanying drawing 1 to accompanying drawing 3 explanation the utility model:

Referring to accompanying drawing 1 and accompanying drawing 2, a kind of high accuracy zero sequence current transformer is provided, constitute by transformer casing 1 and the transformer core 2 and the winding on the magnetic core 2 that are placed in the shell 1, it is characterized in that: said magnetic core 2 adopts the iron based nano crystal soft magnetic materials to process.

Shown in Figure 2, the toroidal core 2 that monitored ampere wires or netting twine are processed from the iron based nano crystal soft magnetic material passes and exports the structure of (OUT).

Referring to Fig. 3, the electrical connection of the utility model is described:

P1, P2 represent monitored electric current the two poles of the earth, and S1 and S2 are these transformer induced signal output the two poles of the earth, and wherein P1, S1 are end of the same name (*).

Though preceding text have shown the detailed embodiment of the utility model, obvious, those skilled in the art revises and changes can carry out part under the prerequisite of the utility model; The content of mentioning in the description of preceding text and the accompanying drawing is not as the restriction to the utility model only as illustrative case, has the high accuracy zero sequence current transformer of above-mentioned technical characterictic, all falls into the utility model protection range.

Claims

1. high accuracy zero sequence current transformer is made up of transformer casing and the transformer core and the winding on the magnetic core that are placed in the shell, and it is characterized in that: said magnetic core adopts the iron based nano crystal soft magnetic material to process.