CN203165656U

CN203165656U - Combined winding type current transformer

Info

Publication number: CN203165656U
Application number: CN 201320205197
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: 2013-08-28
Anticipated expiration: 2023-04-18

Abstract

The utility model discloses a combined winding type current transformer, which comprises an electromagnetic induction coil which is wound on an alloy iron core, a coil insulation layer is arranged outside the electromagnetic induction coil, terminal blocks are guided out from two ends of the electromagnetic induction coil, wherein the electromagnetic induction coil comprises an integer-turn conductive coil and a fractional-turn conductive coil, the integer-turn conductive coil is formed by winding a first copper wire, and the fractional-turn conductive coil is formed by winding a second copper wire and a third copper wire. The combined winding type current transformer provided by the utility model adopts a winding structure combining the integer turn with the fractional turn, and the aims of compressing the size of the electromagnetic induction coil and adjusting accuracy are fulfilled by adjusting the number of turns of the fractional turn, so the accuracy of the current transformer is improved.

Description

Combination enwinding type current transformer

Technical field

The utility model relates to a kind of current transformer, relates 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 limits coiling more, 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, can in limited space, use the fractional turns compensation, and improve core section, fall low magnetic density, produce the high accuracy instrument transformer.

The utility model content

Technical problem to be solved in the utility model provides a kind of combination enwinding type current transformer, can effectively compress the electromagnetic induction coil size, and improves the precision of current transformer.

The utility model is to solve 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 utility model contrast prior art has following beneficial effect: the combination enwinding type current transformer that the utility model provides, 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 is the utility model combination enwinding type current transformer structural representation;

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 utility model will be further described below in conjunction with drawings and Examples.

Fig. 1 is the utility model combination enwinding type current transformer structural representation.

See also Fig. 1, the combination enwinding type current transformer that the utility model provides 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.

The combination enwinding type current transformer that the utility model provides, 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 copper cash 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 utility model 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, the combination enwinding type current transformer that the utility model provides, 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 utility model discloses as above with preferred embodiment; so it is not in order to limit the utility model; any those skilled in the art; in not breaking away from spirit and scope of the present utility model; when doing a little modification and perfect, therefore protection range of the present utility model is worked as 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, the line processed of described the 3rd copper wire 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.