CN103187160A

CN103187160A - Combination winding type current transformer and manufacturing method thereof

Info

Publication number: CN103187160A
Application number: CN2013101403429A
Authority: CN
Inventors: 虞育号; 肖记理; 孙飞
Original assignee: NANJING ZHIDA ELECTRIC CO Ltd
Current assignee: NANJING ZHIDA ELECTRIC CO Ltd
Priority date: 2013-04-18
Filing date: 2013-04-18
Publication date: 2013-07-03
Anticipated expiration: 2033-04-18
Also published as: CN103187160B

Abstract

The invention discloses a combination winding type current transformer and a manufacturing method of the combination winding type current transformer. The current transformer comprises an electromagnetic induction coil, wherein the electromagnetic induction coil is wound on an alloyed iron core, a coil insulating layer is arranged outside the electromagnetic induction coil, wiring terminals extend from two ends of the electromagnetic induction coil, the electromagnetic induction coil comprises integer turns of wire loops and fractional turns of wire loops, the integer turns of wire loops are formed by winding first copper wires, and the fractional turns of wire loops are formed by winding second copper wires and third copper wires. According to the combination winding type current transformer and the manufacturing method of the combination winding type current transformer provided by the invention, a winding structure combining integer turns and fractional turns is adopted, and the purposes of compressing the size of the electromagnetic induction coil and adjusting the precision are achieved by regulating the turns of the fractional turns, thus the precision of the current transformer is improved.

Description

Combination enwinding type current transformer and preparation method thereof

Technical field

The present invention relates to a kind of current transformer and preparation method thereof, relate in particular to a kind of combination enwinding type current transformer and preparation method thereof.

Background technology

Current transformer error compensation method commonly used at present has whole circle compensation, fractional turns compensation, magnetic shunt compensation etc.For the bigger product of number of ampere turns, the compensation method of taking to use always can be satisfied the requirement of error limit value.But there is following defective respectively in existing compensation at high precision current transformer:

1) whole circle compensation: because the little compensation numerical value of no-load voltage ratio can't be modulated to numerical value in the scope of regulation greatly; 2) fractional turns compensation: because iron core itself needs exciting current, so current transformer in uncompensation, current error is generally minus tolerance.Existing fractional turns compensation way generally is divided into a secondary lead the transversal gross area identical two or many coilings, by adjusting wherein one error is regulated.Because existing method is two coilings simultaneously, it is bigger to take up room, thus compressed cross section unshakable in one's determination, thus make iron core saturated in advance; 3) magnetic shunt compensation: be only applicable to the silicon steel plate core product.

Therefore, existing compensation is at high precision current transformer each defectiveness all, therefore, be necessary to provide a kind of combination enwinding type current transformer and preparation method thereof, can in limited space, use the fractional turns compensation, and low magnetic density falls in the raising core section, produces the high accuracy instrument transformer.

Summary of the invention

Technical problem to be solved by this invention provides a kind of combination enwinding type current transformer and preparation method thereof, can effectively compress the electromagnetic induction coil size, and improves the precision of current transformer.

The present invention solves the problems of the technologies described above the technical scheme that adopts to provide a kind of combination enwinding type current transformer, comprise electromagnetic induction coil, described electromagnetic induction coil is wrapped on the alloy core, described electromagnetic induction coil peripheral hardware has coil covering, the two ends of described electromagnetic induction coil lead to binding post, wherein, described electromagnetic induction coil comprises whole numbers of turns loop and fractional turns loop, described whole numbers of turns loop is formed by the first copper cash coiling, and described fractional turns loop is formed by second copper cash and the 3rd copper cash coiling.

Above-mentioned combination enwinding type current transformer, wherein, the coiling number of turn of described whole numbers of turns loop is N-n; The coiling number of turn of described fractional turns loop is n, n＞1, and N is total number of turns.

Above-mentioned combination enwinding type current transformer, wherein, described first copper cash is the copper cash of diameter 1.8mm, and described second copper cash is the copper cash of diameter 1.12mm, and described the 3rd copper cash is the copper cash of diameter 1.45mm; The coiling number of turn n of described fractional turns loop is 20～60, and total number of turns N is 120.

Above-mentioned combination enwinding type current transformer, wherein, described alloy core is the ultramicro-crystal alloy iron core.

Above-mentioned combination enwinding type current transformer, wherein, described coil covering is the PET insulating barrier.

The present invention also provides a kind of manufacture method that makes up the enwinding type current transformer for solving the problems of the technologies described above, and comprises the steps: a) to utilize the first copper cash coiling whole numbers of turns loop at alloy core earlier; B) use second copper cash and the 3rd copper cash coiling residue number of turn then instead and form the fractional turns loop; C) at coiling good electromagnetic induction coil and alloy core peripheral hardware coil covering is arranged, the welding binding post.

The preparation method of above-mentioned combination enwinding type current transformer, wherein, described first copper cash is the copper cash of diameter 1.8mm, and described second copper cash is the copper cash of diameter 1.12mm, and described the 3rd copper cash is the copper cash of diameter 1.45mm; The coiling number of turn n of described fractional turns loop is 20,40 or 60, and total number of turns N is 120.

The present invention contrasts prior art following beneficial effect: combination enwinding type current transformer provided by the invention and preparation method thereof, adopt whole circle and the winding structure that divides circle to combine, reach the purpose of compression electromagnetic induction coil size and adjustment precision by the number of turn of adjusting fractional turns, thereby improve the precision of current transformer.

Description of drawings

Fig. 1 makes up enwinding type current transformer structural representation for the present invention;

Fig. 2 is the combination coiling schematic diagram of electromagnetic induction coil among Fig. 1.

Among the figure:

1 coil covering, 2 whole numbers of turns loop, 3 fractional turns loop

4 alloy cores, 5 binding posts

Embodiment

The invention will be further described below in conjunction with drawings and Examples.

Fig. 1 makes up enwinding type current transformer structural representation for the present invention.

See also Fig. 1, combination enwinding type current transformer provided by the invention comprises electromagnetic induction coil, described electromagnetic induction coil is wrapped on the alloy core 4, described electromagnetic induction coil peripheral hardware has coil covering 1, the two ends of described electromagnetic induction coil lead to binding post 5, wherein, described electromagnetic induction coil comprises whole numbers of turns loop 2 and fractional turns loop 3, described whole numbers of turns loop 2 is formed by the first copper cash coiling, and described fractional turns loop 3 is formed by second copper cash and the 3rd copper cash coiling.

Combination enwinding type current transformer provided by the invention, wherein, the coiling number of turn of described whole numbers of turns loop 2 is N-n; The coiling number of turn of described fractional turns loop 3 is n, n＞1, and N is total number of turns; Described first line processed can be the copper cash of diameter 1.8mm, and described second copper cash is the copper cash of diameter 1.12mm, and described the 3rd copper cash is the copper cash of diameter 1.45mm; The coiling number of turn n of described fractional turns loop 3 is 20～60, and total number of turns N is 120.

Above-mentioned combination enwinding type current transformer, described coil covering 1 are PET (Polyethylene terephthalate) insulating barrier; Described alloy core 4 is preferably the ultramicro-crystal alloy iron core; Ultracrystallite also claims nano amorphous, the ultracrystallite magnetic core has higher saturation induction density, high magnetic permeability, low-coercivity, low-loss and good stable, resistance to wear, corrosion resistance have lower price simultaneously, in all metal soft magnetic material cores, has best cost performance, replace silicon steel, permalloy and ferrite are widely used in and make various types of transformer iron core.

The present invention also provides a kind of preparation method who makes up the enwinding type current transformer, please comprise the steps: simultaneously referring to Fig. 1 and Fig. 2

Step S1: utilize the first copper cash coiling whole numbers of turns loop 2 at alloy core 4 earlier;

Step S2: use second copper cash and the 3rd copper cash coiling residue number of turn then instead and form fractional turns loop 3; Such as, for the 600/5A instrument transformer, first copper cash can be selected the copper cash of diameter 1.8mm for use, and described second copper cash can be selected the copper cash of diameter 1.12mm for use, and described the 3rd copper cash is the copper cash of diameter 1.45mm; Specified total number of turns N is 120 circles, the compensation number of turn, and namely the coiling number of turn n of fractional turns loop 3 can adjust flexibly, as coiling 20,40 or 60;

Step S3: electromagnetic induction coil and alloy core 4 peripheral hardwares good in coiling have coil covering 1, and 5, two terminations of welding binding post are respectively S1 and S2.

In sum, combination enwinding type current transformer provided by the invention and preparation method thereof, the winding structure that adopts whole numbers of turns loop 2 to combine with fractional turns loop 3, the compensation number of turn of fractional turns loop 3 can be set at the arbitrary value of 1～n according to actual needs, with the control that realizes under the different compensation circles coil dimension and error are adjusted, satisfy the high-precision requirement of current transformer, reach the purpose of compression electromagnetic induction coil size and adjustment precision simultaneously.

Though the present invention discloses as above with preferred embodiment; right its is not in order to limiting the present invention, any those skilled in the art, without departing from the spirit and scope of the present invention; when can doing a little modification and perfect, so protection scope of the present invention is when with being as the criterion that claims were defined.

Claims

1. one kind is made up the enwinding type current transformer, comprise electromagnetic induction coil, described electromagnetic induction coil is wrapped on the alloy core (4), described electromagnetic induction coil peripheral hardware has coil covering (1), the two ends of described electromagnetic induction coil lead to binding post (5), it is characterized in that, described electromagnetic induction coil comprises whole numbers of turns loop (2) and fractional turns loop (3), described whole numbers of turns loop (2) is formed by the first copper cash coiling, and described fractional turns loop (3) is formed by second copper cash and the 3rd copper cash coiling.

2. combination enwinding type current transformer as claimed in claim 1 is characterized in that, the coiling number of turn of described whole numbers of turns loop (2) is N-n; The coiling number of turn of described fractional turns loop (3) is n, n＞1, and N is total number of turns.

3. combination enwinding type current transformer as claimed in claim 1 is characterized in that, described first copper cash is the copper cash of diameter 1.8mm, and described second copper cash is the copper cash of diameter 1.12mm, and described the 3rd copper cash is the copper cash of diameter 1.45mm; The coiling number of turn n of described fractional turns loop (3) is 20～60, and total number of turns N is 120.

4. combination enwinding type current transformer as claimed in claim 1 is characterized in that, described alloy core (4) is the ultramicro-crystal alloy iron core.

5. combination enwinding type current transformer as claimed in claim 1 is characterized in that, described coil covering (1) is the PET insulating barrier.

6. the preparation method of a combination enwinding type current transformer as claimed in claim 1 is characterized in that, comprises the steps:

A) utilize the first copper cash coiling whole numbers of turns loop (2) at alloy core (4) earlier;

B) use second copper cash and the 3rd copper cash coiling residue number of turn then instead and form fractional turns loop (3);

C) at coiling good electromagnetic induction coil and alloy core (4) peripheral hardware coil covering (1) is arranged, welding binding post (5).

7. the preparation method of combination enwinding type current transformer as claimed in claim 6 is characterized in that, described first copper cash is the copper cash of diameter 1.8mm, and described second copper cash is the copper cash of diameter 1.12mm, and described the 3rd copper cash is the copper cash of diameter 1.45mm; The coiling number of turn n of described fractional turns loop (3) is 20,40 or 60, and total number of turns N is 120.