CN204857421U

CN204857421U - No electric arc on -load voltage -regulating transformer

Info

Publication number: CN204857421U
Application number: CN201520407218.9U
Authority: CN
Inventors: 王文明; 张乐; 刘建辉
Original assignee: Sina-Newchance New Energy Technology Corp Ltd
Current assignee: Sina-Newchance New Energy Technology Corp Ltd
Priority date: 2015-06-12
Filing date: 2015-06-12
Publication date: 2015-12-09
Anticipated expiration: 2025-06-12

Abstract

The utility model relates to a no electric arc on -load voltage -regulating transformer, this transformer include iron core, alternating current coil winding and direct current excitation regulating winding, and wherein, the iron core axial sets up at the center of alternating current coil winding, and direct current excitation regulating winding sets up between iron core and alternating current coil winding, and direct current excitation regulating winding inserts the direct current. Because the utility model provides a transformer has increased direct current excitation regulating winding, and inserts the direct current to it, and consequently, the contact does not have electric arc during the pressure regulating to to the life -span and not influence of heat dissipation of contact, but also can realize online pressure regulating, and under the wide condition of control range, can carry out the transition to the regulation contact through regulation remanent flux density to realize, so both can finely tune voltage, improve the precision of pressure regulating, but also practiced thrift the energy.

Description

Without electric arc on-load tap-changing transformer

Technical field

The utility model relates to field transformer, is specifically related to a kind of without electric arc on-load tap-changing transformer.

Background technology

Existing transformer generally includes the auxiliary contact of strip resistance or reactance, and its pressure regulation method mainly comprises following several:

1, without excitatory pressure regulation

Without excitatory pressure regulation be at transformer primary side and secondary side all in electrical network beginning situation, use the tap without excitatory tap changer conversion primary side or secondary side, change its effective winding, reach the object of pressure regulation.The shortcoming of this technology is: be first with load pressure regulation, can not must disconnect electrical network during pressure regulation, therefore can not on-line automaticly regulate; In addition, because voltage regulating mode has pole pressure regulation, thus precision is low.

2, on-load voltage regulation

On-load voltage regulation be when transformer on load operation, use on-load voltage regulating switch conversion primary side or the tap of secondary side, change its effective winding, thus reach the object of pressure regulation.When usual on-load voltage regulation scope is less (such as 15% and following), pressure regulation part is a part for basic coil, it is then a coil when on-load voltage regulation scope is larger, there are three kinds of forms, Fig. 1 a goes out to hold direct pressure regulation, Fig. 1 b is central point pressure regulation, and Fig. 1 c goes out the pressure regulation of end band winding, and Fig. 1 b is conventional pressure regulation method.

The transitional processes of existing transformer on-load voltage regulating is as shown in Figure 1: the method is realized by load tap changer, adopt in conversion process resistance or reactance excessive, with limit its excessive time circulating current, therefore have reactance and resistance point.The feature of reactance is, design by the continuous operation of reactor, therefore, the position work of cross-over connection 2 taps can be rested in conversion point termination process, when required pressure regulation progression is identical, load tap changer is made to reduce half, even if the power supply of shunting switch work, break down in excessive arbitrary process, transformer still can continue to run, but circulating current power factor (PF) time is excessively lower, when contact switches, electric current is larger, easy generation electric arc, thus cause the contact life-span short, and owing to it using reactor, therefore at volume, cost all do not have advantage yet.The feature of resistance-type is that transition time is shorter, but because resistance is short-term operation, operating mechanism, once switch, must complete, if mechanism is unreliable, if interrupted during switching, then it can be made to rest on switching position, thus cause resistance to burn and generation accident.Because on load tap changer switch current is large, there is bad impact to insulation oil product and contact life-span, and complex structure, thus there is the problems such as high to material requirements, manufacturing cost is high, degree of regulation is lower.

Utility model content

The purpose of this utility model is to provide a kind of without electric arc on-load tap-changing transformer, in order to solve the problem that in prior art, transformer regulating degree of regulation is low.

The utility model provides a kind of without electric arc on-load tap-changing transformer, this transformer comprises iron core, AC coil winding and DC excitation and regulates winding, wherein, iron core is axially disposed within the center of AC coil winding, DC excitation regulates winding to be arranged between iron core and AC coil winding, and DC excitation regulates winding access direct current.

Further, this transformer also comprises ammeter, and described ammeter and DC excitation regulate winding electric to be connected.

Further, DC excitation regulates the number of turn of winding to be 30000 ~ 60000 circles.

Further, DC excitation regulates winding to access galvanic size is 0 ~ 5A.

The beneficial effect of above-mentioned technical solutions of the utility model is adopted to be: the transformer provided due to the utility model embodiment adds DC excitation and regulates winding, and to its access direct current, therefore, during pressure regulation, contact does not have electric arc, thus does not affect with heat radiation the life-span of contact; But also can be implemented in line pressure regulation, DC excitation regulates the pressure reduction between tapping, can be regulated the size of residual magnetic flux density, under making transformer core just be operated in saturation flux by the size of adjustment direct current exciting current.When adjustable range is wide; contact can be regulated to realize by regulating residual magnetic flux density to be transitioned into; so both can trim voltage; improve the precision of pressure regulation; be unlikely to again to make Flux saturation too much cause primary side current excessive (copper loss is excessive), thus also a saving the energy while protecting first side winding.

Accompanying drawing explanation

Fig. 1 a, Fig. 1 b and Fig. 1 c are the transitional processes schematic diagram of existing transformer on-load voltage regulating;

The structural representation without electric arc on-load tap-changing transformer that Fig. 2 provides for the utility model embodiment one;

The structural representation without electric arc on-load tap-changing transformer that Fig. 3 provides for the utility model embodiment two;

The pressure regulation process schematic without electric arc on-load tap-changing transformer that Fig. 4 provides for the utility model.

Embodiment

For making the object of the utility model embodiment, technical scheme and advantage clearly, below in conjunction with the accompanying drawing in the utility model embodiment, technical scheme in the utility model embodiment is clearly and completely described, obviously, described embodiment is the utility model part embodiment, instead of whole embodiments.

Embodiment one

The utility model embodiment one provides a kind of without electric arc on-load tap-changing transformer, the structural representation without electric arc on-load tap-changing transformer that Fig. 2 provides for the utility model, as shown in Figure 2, this transformer comprises iron core 201, AC coil winding 202 and DC excitation regulate winding 203, wherein, iron core 201 is axially disposed within the center of AC coil winding 202, DC excitation regulates winding 203 to be arranged between iron core 201 and AC coil winding 202, in the present embodiment, winding 203 can be regulated to access direct current to DC excitation, thus make iron core 201 magnetic saturation to the magnetic flux of less winding, circulation is not had with the adjustment that makes to stride.

Embodiment two

As shown in Figure 3, in the present embodiment, ammeter 204 can also be accessed, ammeter 204 is regulated on winding 203 by being connected electrically in DC excitation, thus can monitor more intuitively DC excitation regulate winding 203 access galvanic size.

In the present embodiment, the number of turn of DC excitation adjustment winding 203 can at 30000 ~ 60000 circles, specifically can adjust according to the power of transformer, when transformer efficiency is less, then DC excitation regulates the number of turn required for winding 203 also relatively less, when transformer efficiency is larger, then DC excitation regulates the number of turn required for winding 203 also relatively many.In addition, DC excitation regulates winding 203 to access galvanic size can between 0 ~ 5A, the size can passing through accessed constant current regulates the size of magnetic field intensity, in the present embodiment, DC excitation regulates the pass between the galvanic size that accesses of winding 203 and magnetic field intensity to be: H=N × I/Le; Wherein, H is magnetic field intensity, and unit is A/m, N is the number of turn that DC excitation regulates winding, and I is exciting current (the galvanic electric current that DC excitation regulates winding 203 to access), unit position A, Le is the effective magnetic circuit length of transformer, and unit is m, usually between 1 ~ 2m.Therefore, the electric current of winding and residual flux can be regulated (by observing the size of ammeter reading by the good DC excitation of initial alignment, just can extrapolate residual flux size) relation, the magnetic flux that each tap winding of AC coil winding that combination has been demarcated again produces, just can when the adjustment that strides at every turn, the magnetic flux regulating winding to produce DC excitation, be adjusted under connecting that less group flux density saturation state of winding, after switching to running status, remove the exciting current that DC excitation regulates winding again, thus avoid wasting energy.

The pressure regulation process schematic without electric arc on-load tap-changing transformer that Fig. 4 provides for the utility model, as shown in Figure 4, the transformer provided due to the utility model is provided with DC excitation adjustment winding between iron core and AC coil winding, therefore, when carrying out striding adjustment, winding can be regulated to access direct current to DC excitation, regulated by 2 main contacts, thus make iron core can magnetic saturation to the magnetic flux of less winding, regulate to realize striding and there is no circulation and the high object of regulation precision.

The transformer provided due to the utility model embodiment adds DC excitation adjustment winding, and to its access direct current, therefore, during pressure regulation, contact does not have electric arc, thus does not affect with heat radiation the life-span of contact; But also can be implemented in line pressure regulation, DC excitation regulates the pressure reduction between tapping, can be regulated the size of residual magnetic flux density, under making transformer core just be operated in saturation flux by the size of adjustment direct current exciting current.When adjustable range is wide; contact can be regulated to realize by regulating residual magnetic flux density to be transitioned into; so both can trim voltage; improve the precision of pressure regulation; be unlikely to again to make Flux saturation too much cause primary side current excessive (copper loss is excessive), thus also a saving the energy while protecting first side winding.

Last it is noted that above each embodiment is only in order to illustrate the technical solution of the utility model, be not intended to limit; Although be described in detail the utility model with reference to foregoing embodiments, those of ordinary skill in the art is to be understood that: it still can be modified to the technical scheme described in foregoing embodiments, or carries out equivalent replacement to wherein some or all of technical characteristic; And these amendments or replacement, do not make the essence of appropriate technical solution depart from the scope of each embodiment technical scheme of the utility model.

Claims

1. one kind without electric arc on-load tap-changing transformer, it is characterized in that, described transformer comprises iron core, AC coil winding and DC excitation and regulates winding, described iron core is axially disposed within the center of described AC coil winding, described DC excitation regulates winding to be arranged between described iron core and described AC coil winding, and described DC excitation regulates winding access direct current.

2. transformer according to claim 1, is characterized in that, described transformer also comprises ammeter, and described ammeter and described DC excitation regulate winding electric to be connected.

3. transformer according to claim 1, is characterized in that, described DC excitation regulates the number of turn of winding to be 30000 ~ 60000 circles.

4. transformer according to claim 1, is characterized in that, it is 0 ~ 5A that described DC excitation regulates winding to access galvanic size.