CN203070896U

CN203070896U - K-coefficient transformer

Info

Publication number: CN203070896U
Application number: CN 201220681548
Authority: CN
Inventors: 曹祥雄; 徐启惠; 曹仲飞
Original assignee: SHANGHAI INDUCTEK POWER ELECTRONICS EQUIPMENT Ltd
Current assignee: SHANGHAI INDUCTEK POWER ELECTRONICS EQUIPMENT Ltd
Priority date: 2012-12-11
Filing date: 2012-12-11
Publication date: 2013-07-17
Anticipated expiration: 2022-12-11

Abstract

The utility model relates to a K-coefficient transformer. The K-coefficient transformer aims to overcome the defects of common isolation transformers, is suitable for operating in a circuit environment with a high harmonic wave content, has a filtering function, and can effectively reduce mutual interference between harmonic waves of a converter and a load. The K-coefficient transformer comprises a transformer upper iron yoke, a transformer lower iron yoke and 1-3 transformer core limbs; secondary coils same as the core limbs in number are wound on corresponding core limbs; primary coils same as the core limbs in number are wound outside corresponding secondary coils; one or two layers of screening windings are wound among the primary coils and the secondary coils; and pins of all the screening windings are connected to corresponding connection terminals.

Description

K-coefficient transformer

Technical field

The utility model relates to a kind of power equipment, specifically, relates to a kind of K-coefficient transformer.

Background technology

Along with the development of power electronic technology, high-power nonlinear load occurs in a large number.Large-scale data center for example, important computer floor, comprehensive office block etc.These loads are subjected to the humorous wave interference from power supply on the one hand easily, and himself also can produce more harmonic signal on the other hand, and existing common-mode signal also has difference mode signal.After injecting electrical network from the harmonic wave of load, can disturb other power consumption equipments, even disturb the UPS(current transformer) control module.These harmonic signals also can reduce power supply reliability to for the isolating transformer of its power supply produces a series of harm simultaneously.As causing supply transformer overheated, shorten useful life greatly, when serious even transformer is burnt out at short notice.

Therefore, must possess following several characteristics simultaneously: 1, have stronger anti-harmonic wave ability as the isolating transformer of this class load power supply.When load or mains side harmonic content were higher, transformer can safe operation; 2, jumbo Transformer Winding adopts paper tinsel formula winding (Copper Foil or aluminium foil), reduces the loss that harmonic wave produces; 3, elementary winding delta connection, the secondary winding star connection, Y connection; When 4, each phase load size differed big, the neutral line was unlikely overheated; 5, for inhibited from the harmonic wave of load or power supply, avoid the phase mutual interference; 6, according to application requirements, multi-form shielding winding is set; The shielding winding adopts Copper Foil; 7, has less inrush phenomenon.

Harmonic wave size in the system is usually from frequency and the examination of content two aspects.For the content of harmonic wave in the comprehensive consideration system, weigh with k-factor usually.Under this background, developed the transformer-K-coefficient transformer that adapts to different K-coefficient environment respectively.But, on the existing market, also there is not a kind of K-coefficient transformer can overcome the deficiency of common transformer fully, satisfy above-mentioned requirements simultaneously.

The utility model content

The purpose of this utility model provides a kind of K-coefficient transformer, overcome the deficiency of common isolating transformer, applicable to operating in the higher circuit environment of harmonic content, have filter function, the harmonic wave that can effectively reduce between current transformer and the load harmonic wave interferes with each other.

The purpose of this utility model is achieved in that

A kind of K-coefficient transformer, comprise: iron yoke on transformer, transformer lower yoke, a 1-3 leg, the secondary coil identical with described core limb quantity is around on the corresponding core limb, the primary coil identical with described core limb quantity is around in corresponding secondary coil outside, be wound with one deck or two-layer shielding winding between described primary coil and the secondary coil, the described lead-in wire that respectively shields winding is connected on the corresponding binding post.

Further, as a kind of preferred version of the present utility model, between described secondary coil and core limb, also be provided with one deck shielding winding.

Further, as a kind of preferred version of the present utility model, also be provided with one deck shielding winding in the outside of described primary coil.

Wherein, the lead-in wire of described shielding winding is the high-temperature insulation cable; Described shielding winding is Copper Foil or aluminium foil.

When described leg was one, described leg was EI sections stem, and described K-coefficient transformer is single-phase transformer; When described leg was two, described K-coefficient transformer was single-phase transformer; When described leg was three, described k-factor transformer was three-phase transformer.

Air gap can be provided with on the described leg, also air gap can be do not established.When leg was provided with air gap, described air gap was located in the middle of the core limb or the junction of core limb and upper yoke/lower yoke.

Wherein, described core limb is amorphous iron stem, orientation silicon steel core limb or non-orientation silicon steel core limb; Described upper yoke or lower yoke are amorphous iron yoke, orientation silicon steel iron yoke or non-orientation silicon steel iron yoke.

The utility model is according to calculating under the different K coefficient condition, loss in transformer core and the winding, transformer electromagnetic scheme and organization plan that aspect such as design temperature rise, inrush phenomenon meets the demands, enable safe operation under the higher environment of harmonic content, guarantee that transformer operates under the corresponding k-factor environment, can not surpass the temperature rise that allows; Transformer no-load switchon surge is no more than allowed band, generally can accomplish below 10 times, and no-load transformer can not cause its prime switch trip when closing a floodgate; Realize filter function by the shielding winding that is arranged between primary coil and the secondary coil, suppressed the phase mutual interference between power supply and the load effectively, but guarantee power supply and all safe operations of load.

Description of drawings

By following embodiment of the present utility model and description taken together with the accompanying drawings, other advantage of the present utility model and feature are shown, this embodiment provides with the form of example, but is not limited to this, wherein:

Structural representation when Fig. 1 is three for the quantity of the core limb of the utility model K-coefficient transformer;

Fig. 2 is the structural representation of the left side view direction of embodiment shown in Fig. 1;

Structural representation when Fig. 3 is two for the quantity of the core limb of the utility model K-coefficient transformer;

Fig. 4 is the structural representation of the left side view direction of embodiment shown in Fig. 3;

Structural representation when Fig. 5 is one for the quantity of the core limb of the utility model K-coefficient transformer;

Fig. 6 is the structural representation of the left side view direction of embodiment shown in Fig. 5;

Fig. 7 is the cross-sectional view (first kind of set-up mode of shielding winding) of the core limb of the utility model K-coefficient transformer;

Fig. 8 is the cross-sectional view (second kind of set-up mode of shielding winding) of the core limb of the utility model K-coefficient transformer;

Fig. 9 is the cross-sectional view (the third set-up mode of shielding winding) of the core limb of the utility model K-coefficient transformer;

Figure 10 is the cross-sectional view (the 4th kind of set-up mode of shielding winding) of the core limb of the utility model K-coefficient transformer.

Embodiment

As shown in Figure 1 and Figure 2, a kind of K-coefficient transformer, comprise an iron yoke on transformer 1, a transformer lower yoke 3 and three legs 2, the outside of each core limb 2 be wound with respectively one group of secondary coil 4 around with one group of primary coil 5, be equipped with shielding winding 6 on each core limb, in conjunction with shown in Figure 7, one group of secondary coil 4 is around on the core limb 2, one group of primary coil 5 is around in the outside of secondary coil 4, be wound with one deck shielding winding 6 between primary coil 5 and the secondary coil 4, the lead-in wire of shielding winding 6 is connected on the corresponding binding post 7.Wherein, shielding winding 6 is Copper Foil or aluminium foil, and its lead-in wire is the high-temperature insulation cable.In the present embodiment, the quantity of leg 2 is three, and the utility model k-factor transformer is three-phase transformer.

Air gap can be provided with on the leg 2, also air gap can be do not established.Air gap can be located at the junction of core limb 2 centres or core limb 2 and upper yoke 1 or lower yoke 3, not shown gap structure in the accompanying drawing.

Wherein, core limb 2 is amorphous iron stem, orientation silicon steel core limb or non-orientation silicon steel core limb; Upper yoke 1 or lower yoke 3 are amorphous iron yoke, orientation silicon steel iron yoke or non-orientation silicon steel iron yoke.

The set-up mode of shielding winding has multiple, be illustrated in figure 7 as wherein a kind of: one group of secondary coil 4 is around on the core limb 2, one group of primary coil 5 is around in the outside of secondary coil 4, be wound with one deck shielding winding 6 between primary coil 5 and the secondary coil 4, the lead-in wire of shielding winding 6 is connected on the corresponding binding post 7.

Be illustrated in figure 8 as second kind of set-up mode of shielding winding: one group of secondary coil 4 is around on the core limb 2, one group of primary coil 5 is around in the outside of secondary coil 4, between primary coil 5 and secondary coil 4, be wound with one deck shielding winding 6, also be wound with one deck shielding winding 6 between secondary coil 4 and core limb 2, the lead-in wire of shielding winding 6 is connected on the corresponding binding post 7.

Be illustrated in figure 9 as the third set-up mode of shielding winding: one group of secondary coil 4 is around on the core limb 2, one group of primary coil 5 is around in the outside of secondary coil 4, between primary coil 5 and secondary coil 4, be wound with one deck shielding winding 6, between secondary coil 4 and core limb 2, also be wound with one deck shielding winding 6, and still being wound with one deck shielding winding 6 in the outside of primary coil 5, the lead-in wire that covers winding 6 is connected on the corresponding binding post 7.

Be the 4th kind of method to set up of shielding winding as shown in figure 10: the difference of itself and the third method is, in this method, is wound with two-layer shielding winding 6 between primary coil 5 and the secondary coil 4.

As shown in Figure 3, Figure 4, when the quantity of leg 2 was two, the utility model K-coefficient transformer was single-phase transformer, comprised an iron yoke on transformer 1, a transformer lower yoke 3 and two legs 2.The outside of each core limb 2 be wound with respectively one group of secondary coil 4 around with one group of primary coil 5, be equipped with shielding winding 6 on each core limb, the set-up mode of shielding winding can be selected as shown in Fig. 7-10 any one.

Be that transformer is single-phase transformer as Fig. 5, K-shown in Figure 6, comprise an iron yoke on transformer 1, a transformer lower yoke 3 and a leg 2.Leg 2 is EI sections stem (as shown in Figure 5), the outside of core limb 2 be wound with one group of secondary coil 4 around with one group of primary coil 5, also be provided with shielding winding 6 on the core limb 2, the set-up mode of shielding winding can be selected any one as shown in Fig. 7-10.

Claims

1. K-coefficient transformer, it is characterized in that, comprise: iron yoke on transformer, transformer lower yoke, a 1-3 leg, the secondary coil identical with described core limb quantity is around on the corresponding core limb, the primary coil identical with described core limb quantity is around in corresponding secondary coil outside, be wound with one deck or two-layer shielding winding between described primary coil and the secondary coil, the described lead-in wire that respectively shields winding is connected on the corresponding binding post.

2. K-coefficient transformer as claimed in claim 1 is characterized in that: be provided with one deck shielding winding between described secondary coil and core limb.

3. K-coefficient transformer as claimed in claim 1 is characterized in that: be provided with one deck shielding winding in the outside of described primary coil.

4. as the described K-coefficient of arbitrary claim transformer among the claim 1-3, it is characterized in that: the lead-in wire of described shielding winding is the high-temperature insulation cable.

5. as the described K-coefficient of arbitrary claim transformer among the claim 1-3, it is characterized in that: described shielding winding is Copper Foil or aluminium foil.

6. K-coefficient transformer as claimed in claim 1, it is characterized in that: when described leg was one, described leg was EI sections stem.

7. K-coefficient transformer as claimed in claim 1, it is characterized in that: described leg is provided with air gap.

8. K-coefficient transformer as claimed in claim 7 is characterized in that: described air gap is located in the middle of the core limb or the junction of core limb and upper yoke/lower yoke.

9. K-coefficient transformer as claimed in claim 1, it is characterized in that: described core limb is amorphous iron stem, orientation silicon steel core limb or non-orientation silicon steel core limb.

10. K-coefficient transformer as claimed in claim 1, it is characterized in that: described upper yoke or lower yoke are amorphous iron yoke, orientation silicon steel iron yoke or non-orientation silicon steel iron yoke.