CN209183380U - Miniature protected level current transformer - Google Patents

Abstract

The utility model discloses miniature protected level current transformers, including height to lead directional cold-rolling silicon steel iron core and Double-wire parallel wound winding；It is cuboid that the height, which leads directional cold-rolling silicon steel iron core,；The height is led directional cold-rolling silicon steel iron core and is made of cold-reduced silicon sheet；It is arcuation that the height, which leads directional cold-rolling silicon steel iron core edges and corners,；The Double-wire parallel wound winding terminal is connected with high temperature lead-out wire.The utility model saves volumetric spaces, ensure that the high measuring accuracy of current transformer；Using single iron core double winding form, the enameled wire of two windings uses Double-wire parallel wound form, on the one hand can reduce mutual inductor copper wire and flow through size of current, reduce the loss of power, on the other hand the reliability of product testing current is also increased, while significantly reduces the temperature rise of coil；Edges and corners avoid magnetic material winding process corner's damage influence to the magnetic property of product at arcuation when coiling iron core.

Description

Miniature protected level current transformer

Technical field

The utility model relates to current transformer more particularly to miniature protected level current transformers.

Background technique

The common material of current transformer core has amorphous and nanocrystalline, permalloy and silicon steel material, no matter uses Which kind of material, since the saturation induction density of material is certain, when test electric current reaches certain range ability, iron core can occur Saturated phenomenon, output curent change reduce, and are unable to satisfy the linear measurement and protection requirement of protected level electric current.

Existing current transformer product, since size is larger, quality is larger, not only occupies larger space, Er Qiecheng This is higher, expensive, and the occasion used is also restrained.

Utility model content

The purpose of this utility model is that solve the above-mentioned problems and provides miniature protected level current transformer, including Height leads directional cold-rolling silicon steel iron core and Double-wire parallel wound winding；It is cuboid that the height, which leads directional cold-rolling silicon steel iron core,；The height is led Directional cold-rolling silicon steel iron core is made of cold-reduced silicon sheet；It is arcuation that the height, which leads directional cold-rolling silicon steel iron core edges and corners,；It is described double Line is simultaneously connected with high temperature lead-out wire around winding terminal.

Further, the cold-reduced silicon sheet is with a thickness of 0.15mm-0.25mm.

Further, the Double-wire parallel wound winding is 0.16QY-2 type enameled wire.

The utility model has the beneficial effects that:

(1) iron core select material be high saturation magnetic induction, low core loss value (Hi-B) silicon steel material, can expire in this way The requirement overloaded enough, and volumetric spaces are saved, it ensure that the high measuring accuracy of current transformer；

(2) using single iron core double winding form, the enameled wire of two windings uses Double-wire parallel wound form, on the one hand can drop Low mutual inductor copper wire flows through size of current, reduces the loss of power, on the other hand also increases the reliability of product testing current, The temperature rise of coil is significantly reduced simultaneously；

(3) iron core is led directional cold-rolling silicon steel magnetic tape material using height and is wound, saturation induction density with higher, And lower iron loss；

(4) edges and corners avoid magnetic material winding process corner's damage influence to product at arcuation when coiling iron core Magnetic property.

Detailed description of the invention

Fig. 1 is the structural schematic diagram of miniature protected level current transformer.

Specific embodiment

The utility model is described in further detail with reference to the accompanying drawing:

As shown in Figure 1, the miniature protected level current transformer of the utility model, including height leads directional cold-rolling silicon steel iron core and double Line and around winding；It is cuboid that the height, which leads directional cold-rolling silicon steel iron core,；The height leads directional cold-rolling silicon steel iron core by cold-reduced silicon Steel disc composition；It is arcuation that the height, which leads directional cold-rolling silicon steel iron core edges and corners,；The Double-wire parallel wound winding terminal is connected with height Warm lead-out wire.

Double-wire parallel wound winding uses 0.16QY-2 type enameled wire.

Iron core select material be high saturation magnetic induction, low core loss value (Hi-B) silicon steel material, be both able to satisfy in this way The requirement of overload, and volumetric spaces are saved, it ensure that the higher measuring accuracy of current transformer.

Winding uses Double-wire parallel wound form using single iron core double winding form, the enameled wire of two windings, on the one hand can be with It reduces mutual inductor copper wire and flows through size of current, reduce the loss of power, on the other hand also increase the reliable of product testing current Property, while significantly reducing the temperature rise of coil；After complete winding enameled wire, the end of a thread outlet is drawn with high temperature lead-out wire, line The place of head contact bandages, and four the end of a thread of double winding are distinguish with the line of four kinds of colors of red-black champac, and wherein 1A and 1B is One group of winding, 2A and 2B are another set windings.High temperature lead-out wire and enameled wire the end of a thread weld are wrapped up with high-temperature insulation adhesive tape Good, coil finally uses high-temperature insulation oil to be impregnated.

Core material is that the cold-rolled orientation silicon steel piece of 0.20mm thickness is superimposed, and it is cuboid that height, which leads directional cold-rolling silicon steel iron core, Rectangular body thickness is only 5mm.The magnetic induction intensity of general grain-oriented Si steel sheet reaches as high as 16000 Gausses, part Hi-B silicon steel sheet It even can achieve 19000 Gausses, by being controlled in the orientation angles of rolling direction crystal grain when processing Hi-B silicon steel sheet Extremely low core loss may be implemented.On the other hand since initial permeability is in 3000 or so, in high saturated magnetic induction Under the conditions of, B-H loop is more gentle, and very wide measurement range may be implemented, and still further aspect silicon steel sheet is in magnetic field strength When 1.7T, within iron loss control to 0.98W/kg, become smaller in this way to the exciting current of excitation, the measuring accuracy of mutual inductor It can improve.

Nominal load: 115V/400Hz three-phase；Single-phase primary rated current: 50A；Mutual inductor coil is at 5 times and 5 times or less Product works long hours when overload rating, and functional characteristic is normal；It is not damaged in product 5s when 5 times~8 times overloads, functional characteristic is just Often；It is not damaged in product 2s when 8 times~12 times overloads, functional characteristic is normal.Every group of secondary output-current rating of 50A coil be 30mA；

The miniature protected level current transformer essence is not influenced when two groups of secondary coil laod unbalance resistance values are less than 1.2 Ω Degree；Primary current is within the scope of 50%~500% rated current within error 2% (whole working environments)；500%~ Within the scope of 1000% rated current within error 4% (whole working environments)；Rated power factor is not less than 0.85.15A,50A, 8 Ω of 100A nominal load, 5A current rating load 8 Ω.

Iron core select material be high saturation magnetic induction, low core loss value (Hi-B) silicon steel material, be both able to satisfy in this way The requirement of overload, and volumetric spaces are saved, it ensure that the high measuring accuracy of current transformer；Using single iron core double winding shape The enameled wire of formula, two windings uses Double-wire parallel wound form, on the one hand can reduce mutual inductor copper wire and flow through size of current, reduces On the other hand the loss of power also increases the reliability of product testing current, while significantly reducing the temperature rise of coil；Iron Core is led directional cold-rolling silicon steel magnetic tape material using height and is wound, saturation induction density with higher and lower iron Damage；Edges and corners avoid magnetic material winding process corner's damage influence to the magnetic property of product at arcuation when coiling iron core.

The limitation that the technical solution of the utility model is not limited to the above specific embodiments, all skills according to the present utility model The technology deformation that art scheme is made, each falls within the protection scope of the utility model.

Claims (3)

1. miniature protected level current transformer, which is characterized in that lead directional cold-rolling silicon steel iron core and Double-wire parallel wound winding including height； It is cuboid that the height, which leads directional cold-rolling silicon steel iron core,；The height is led directional cold-rolling silicon steel iron core and is made of cold-reduced silicon sheet；Institute Stating height and leading directional cold-rolling silicon steel iron core edges and corners is arcuation；The Double-wire parallel wound winding terminal is connected with high temperature lead-out wire.

2. miniature protected level current transformer according to claim 1, which is characterized in that the height leads directional cold-rolling silicon steel iron Core is with a thickness of 0.15mm-0.25mm.

3. miniature protected level current transformer according to claim 1, which is characterized in that the Double-wire parallel wound winding is 0.16QY-2 type enameled wire.