CN105895344A - Unsaturated current transformer and fabrication method thereof - Google Patents

Abstract

The invention relates to an unsaturated current transformer and a fabrication method thereof. In the current transformer, a framework of the annular current transformer is made of a non-magnetic conduction material and is solid, an annular groove is formed in the annular outer side, the depth of the groove is in the way that at least three enameled wires winding around a secondary coil can be embedded into the groove, the secondary coil comprises two parts, one part winds in the annular groove, and the other part winds around the annular framework. The winding method comprises the following steps of winding the part in the annular framework for 3 circles, winding the other part around the annular framework, and leading out the head and the tail of the secondary coil; embedding the annular framework wound with the secondary coil into a shielding cover, wherein the shielding cover is an annular cover made of a non-magnetic conduction metal sheet material, and the inner side of the annular cover is opened; and embedding the framework wound with the secondary coil into the annular shielding cover, and placing the framework and the shielding cover into a shell. The unsaturated current transformer fabricated by the method has the advantages of high linearity, large linear range, light weight, low cost and wide application range, and cannot be saturated.

Description

A kind of unsaturation current transformer and manufacture method thereof

Technical field:

The invention belongs to the manufacturing technology field of current transformer.

Technical background:

The iron core that general current transformer is made up of permeability magnetic material, such as silicon steel sheet, stalloy etc., and Coiling on iron core, reinstalls shell and is formed, but this cored current transformer, according to leading The physical arrangement feature of magnetic material, its magnetic flux is conditional, it is impossible to infinitely increase, and therefore uses magnetic conduction The current transformer of iron core made by material, after primary current reaches to a certain degree, and primary current and secondary Electric current is not the most by the linear change of regulation, i.e. secondary output electric current cannot truly reflect and once inputs electricity The sizes values of stream；So it is the most inapplicable at this easy saturating current transformer of some occasion；Send out for this A kind of non-magnet material of bright employing makes the coiling skeleton of current transformer, substitutes the iron core of permeability magnetic material； On non-magnet material skeleton, the method for coiling is different from existing method simultaneously；And around wired The additional radome of skeleton of circle, prevents magnetic interference；Thus overcome the saturated and mutual of current transformer Interference.

Technology contents:

The ring skeleton that the present invention is made up of non-magnet material, the secondary coil being wound on skeleton, set The unsaturation current transformer that radome outside coil and shell are formed, it is characterised in that non-magnetic The ring skeleton that material is made is solid skeleton, and the outer rim side of skeleton has a cannelure, and the deep width of groove is at least Three enamel-covered wires around secondary coil can be embedded, ring skeleton PC material compression molding；Described Secondary coil be made up of two parts, the coil being i.e. wound in cannelure and the coil groups being wound on skeleton Become；Its winding, first in cannelure around three circle, the end of a thread draw, line tail continue on ring skeleton around Another part secondary coil, tail is drawn；Therefore the secondary coil of this current transformer is by being wound in cannelure Coil and be wound on annular bone add coils connected in series composition；Described radome is by non-magnetic gold Belonging to rolling and form two semi-circulars, the interior side opening of ring is easy to embed the skeleton being wound with coil；Ring skeleton After winding secondary coil, then insulating paper of double-baging, become equipment body in being then inserted into radome；Outside described Shell is made up of two parts anyway, is injection mo(u)lding, and secondary coil that ring skeleton winds also is double-baged absolutely Edge paper, is then inserted into radome and grows up to be a useful person body, reinstall shell, and received end to end on shell by secondary coil Binding post on, two half-shells are closed up and seal；Advantage of the present invention, does not has permeability magnetic material iron core, Therefore current transformer will not be saturated, one time input current is by linear rule with secondary output current ratio all the time Walk, and its linearity is fine；This current transformer structure is simple simultaneously, lightweight, also reduces mutual inductance Device cost, applied widely.

Accompanying drawing illustrates:

Accompanying drawing 1 is current transformer cut-away section front view.

Accompanying drawing 2 is the sectional schematic diagram of non-magnet material skeleton and radome.

Accompanying drawing 3 is coiling schematic diagram on non-magnet material skeleton.

Accompanying drawing 1 is current transformer cut-away section front view, and in figure, 1 is shell, is positive and negative by being molded into Two halves, shell 1 has two binding posts 8；2 is radome, non-magnetic sheet metal make two and half Ring, side opening in ring；3 is the non-ring skeleton led and make through material, has a cannelure outside its ring；4 It it is the secondary coil part being wound on ring skeleton 3；5 is centre bore, for wearing a cable or mother Row uses.

Accompanying drawing 2 is the sectional schematic diagram of non-magnetic skeleton and radome, and in figure, 2 is radome, is non-leading The sheet metal of magnetic makes two semi-rings, side opening in ring；3 is ring skeleton；7 is the ring of ring skeleton 3 Outer then cannelure.

Accompanying drawing 3 is non-magnet material backbone winding line schematic diagram, and in figure, 3 is ring skeleton；4 is to be wound on ring A secondary coil part on shape skeleton.

Detailed description of the invention:

According to the technology of the present invention, manufacture unsaturation current transformer, it is desirable to no-load voltage ratio 1000A/100mV (mark On quasi-load resistance), transformer center-hole diameter 56mm, ring skeleton is annular solid, annulus Overall diameter is 78mm, and ring interior diameter is 68mm, and ring skeleton section is circular, a diameter of 10mm, Having a cannelure outside the ring of ring skeleton, secondary coil is Qzy-180 enamel-covered wire, and line footpath is φ 0.21mm, first around three circles in cannelure, then around 850 circles on ring skeleton, draws end to end, Double-baging insulating paper again, load shell in the lump in embedding radome, secondary coil is received on binding post end to end, Two half-shells close up and seal, and this current transformer test result is as follows:

Rated primary current percentage ratio (A)	1%	20%	50%	100%	200%	300%	400%
								Secondary output voltage (standard termination) (mV)	8	20	47	96	191	290	389

In terms of test result, this current transformer primary current inputs from 10A～400,000 A, and secondary current is defeated Go out the most linear, meet design requirement.

Claims (4)

1. unsaturation current transformer and a manufacture method thereof, unsaturation current transformer is by non-magnetic The ring skeleton that material is made, the secondary coil being wound on skeleton, radome and shell formed, its Being characterised by, there is a cannelure (7) in the outside of ring skeleton (3), it is the widest at least can embed three around The enamel-covered wire of secondary coil；Described secondary coil (4) is dimeric, and a part is wound on In cannelure (7), another part is wound on ring skeleton (3)；Described radome (2) is by non- The sheet metal of magnetic conduction makes annular, side opening in ring；Described shell (1) is positive and negative two halves, and it has Two binding posts (8).

A kind of unsaturation current transformer the most according to claim 1 and manufacture method, its feature Being, first around 3 circles in cannelure (7), head is drawn, then around another on ring skeleton (3) Part secondary coil, line tail is drawn.

A kind of unsaturation current transformer the most according to claim 1 and manufacture method, its feature Being, radome (2) is made up of non-magnetic sheet metal, shape as ring skeleton (3), Side opening in its ring.

A kind of unsaturation current transformer the most according to claim 1 and manufacture method, its feature Being, shell (1) is to be shaped by PC material injection, is positive and negative two halves, and transformer device body loads two halves Closing up sealing, secondary coil is received on binding post (8) end to end.