CN205335056U - Be total to box isolation transformer - Google Patents

Abstract

The utility model provides a common box-type isolation transformer, comprising: a transformer box, at least two single-phase transformer bodies and an auxiliary transformer body, the at least two transformer bodies and the auxiliary transformer body are installed on the In the transformer box, each single-phase transformer body includes a primary winding and a pair of secondary windings, and the primary windings of the at least two single-phase transformer bodies are drawn out after being connected in parallel in the transformer box. The secondary windings of at least two single-phase transformer bodies and the auxiliary transformer windings are separately drawn out from the transformer box. The common box-type isolation transformer provided by the utility model reduces the overall volume of the transformer, saves the occupied area of the transformer installation site, and reduces the material cost of the transformer at the same time.

Description

Common box type isolation transformer

technical field

The utility model relates to the electrical field, in particular to a box-common isolation transformer.

Background technique

With the continuous development of electrified railways in our country, active filter devices are more and more widely used in comprehensive harmonic control of high-speed railways. As the main equipment of the active filtering device, the isolation transformer is usually connected to the parallel side of the converter in the active filtering device. Since the parallel side of the converter is composed of multiple converter units, the connection mode of the isolation transformer is required to be: one high-voltage winding on the primary side, multiple windings on the secondary side and an independent auxiliary winding.

At present, the power supply of multiple windings on the secondary side and an independent auxiliary winding is usually completed by using multiple independently installed transformers plus an auxiliary transformer. Each transformer is installed in a different transformer box. In this installation method, the overall volume of the transformer becomes larger, which increases the occupied area of the transformer installation site.

Utility model content

The embodiment of the utility model provides a box-common isolation transformer, which is used to solve the problem that the isolation transformer in the prior art increases the occupied area of the transformer installation site.

The utility model provides a common box-type isolation transformer, comprising: a transformer box, at least two single-phase transformer bodies and an auxiliary transformer body, the at least two transformer bodies and the auxiliary transformer body are installed on the In the transformer box, each single-phase transformer body includes a primary winding and a pair of secondary windings, and the primary windings of the at least two single-phase transformer bodies are connected in parallel in the transformer box and then drawn out. The secondary windings of at least two single-phase transformer bodies and the auxiliary transformer windings are separately drawn out from the transformer box.

In another embodiment, the primary windings of the at least two single-phase transformer bodies are connected in parallel and then connected to a pair of outgoing terminals.

In another embodiment, a pair of secondary windings of each single-phase transformer body is connected to corresponding two pairs of outgoing terminals.

In another embodiment, the number of pairs of outlet terminals corresponding to the secondary windings of the at least two single-phase transformer bodies is twice the number of the single-phase transformer bodies.

In another embodiment, the secondary winding of the single-phase transformer body adopts a mutual decoupling structure between windings.

In another embodiment, there are 5 single-phase transformer bodies, and 10 secondary windings of the single-phase transformer bodies.

In another embodiment, the bodies of the at least two transformers are identical.

In the common box-type isolation transformer provided by the embodiment of the utility model, by installing the at least two single-phase transformer bodies and the auxiliary transformer body in the transformer box, the at least two single-phase transformer bodies The primary windings of the primary windings are connected in parallel in the transformer box, and the secondary windings of the at least two single-phase transformer bodies and the auxiliary transformer windings are separately led out in the transformer box, realizing multiple transformer secondary windings. The power supply mode of one winding and one independent auxiliary winding; by installing multiple transformer bodies in the same transformer box, the overall volume of the transformer is reduced, and the floor area of the transformer installation site is saved; at the same time, the material of the transformer is reduced Cost; again, since the primary windings of multiple transformers are connected in parallel in the transformer box, there is no need for parallel connection outside the transformer box, thereby further reducing the space occupied by the wiring connection outside the box.

In order to make the above-mentioned features and advantages of the present invention more comprehensible, the following specific embodiments are described in detail with accompanying drawings.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description These are some embodiments of the present utility model. Those skilled in the art can also obtain other drawings based on these drawings without any creative work.

Fig. 1 is a schematic structural diagram of a box-common isolation transformer according to an embodiment of the present invention.

detailed description

In order to make the purpose, technical solutions and advantages of the embodiments of the utility model more clear, the technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the utility model. Obviously, the described The embodiments are some embodiments of the present utility model, but not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

The embodiment of the utility model aims at the problem that the isolation transformer in the prior art increases the floor area of the installation site, and proposes a common box type isolation transformer, which reduces the overall volume of the transformer and saves the floor area of the transformer installation site .

Fig. 1 is a schematic structural diagram of a box-common isolation transformer according to an embodiment of the present invention. Please refer to Fig. 1, the common box type isolation transformer provided by the embodiment of the utility model includes: a common box type isolation transformer, including: a transformer box 10, at least two single-phase transformer bodies 20 and an auxiliary transformer body 30 , the at least two single-phase transformer bodies 20 and the auxiliary transformer body 30 are installed in the transformer box 10, each single-phase transformer body 20 includes a primary winding and a pair of secondary windings, The primary windings of the at least two single-phase transformer bodies 20 are drawn in parallel in the transformer box, and the secondary windings of the at least two single-phase transformer bodies 20 and the auxiliary transformer windings are respectively connected in the Separately lead out in the transformer case 10.

In the common box-type isolation transformer provided by the embodiment of the present invention, by installing the at least two single-phase transformer bodies 20 and the auxiliary transformer bodies 30 in the transformer box 10, the at least two single-phase The primary windings of the phase transformer bodies 20 are drawn in parallel in the transformer box, and the secondary windings of the at least two single-phase transformer bodies 20 and the auxiliary transformer windings are separately installed in the transformer box 10. Leading out, the power supply mode of multiple windings on the secondary side of the transformer and an independent auxiliary winding is realized. When in use, the independent auxiliary transformer is used for starting. The common box-type isolation transformer provided by the embodiment of the utility model reduces the overall volume of the transformer by installing multiple transformer bodies in the same transformer box, and saves the floor area of the transformer installation site; Thirdly, since the primary windings of multiple transformers are connected in parallel in the transformer box, there is no need for parallel connection outside the transformer box, thereby further reducing the space occupied by wiring connections outside the box.

Specifically, the primary sides of the at least two single-phase transformer bodies 20 are connected in parallel to a pair of outgoing terminals A, X. A pair of secondary windings of each single-phase transformer body 20 is connected to corresponding two pairs of outgoing terminals.

Further, in order to realize multiple outputs of the secondary side, the number of pairs of outlet terminals corresponding to the secondary winding of the single-phase transformer body 20 is twice the number of the single-phase transformer body.

Specifically, there are at least four pairs of outlet terminals on the secondary sides of the at least two single-phase transformer bodies 20 .

Further, in order to prevent the current impact formed in the power supply circuit from affecting the normal operation of the power supply network, the secondary winding of the single-phase transformer body 20 adopts a mutual decoupling structure between windings.

Specifically, the number of single-phase transformer bodies 20 is 5, and the number of secondary windings of the single-phase transformer bodies 20 is 10. Please refer to Fig. 1, there are ten pairs of outlet terminals corresponding to the secondary winding of the transformer body 20, respectively a1-x1, a2-x2, a3-x3, a4-x4, a5-x5, a6-x6, a7 -x7, a8-x8, a9-x9, a10-x10. The body of the auxiliary transformer has a pair of output terminals au-xu. The auxiliary transformer is used to start the box-common isolation transformer, and when the primary side of the box-common isolation transformer starts to supply power, the auxiliary transformer will no longer work.

Further, in order to ensure that the outputs of multiple sets of secondary windings of the transformer are stable and consistent, the bodies of the at least two transformers are identical.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present utility model, and are not intended to limit it; although the present utility model has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand : It can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements to some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions depart from the embodiments of the present utility model Scope of technical solutions.

Claims (7)

1. a common box type isolating transformer, it is characterized in that, including: transformer-cabinet, at least two single-phase transformer device body and auxiliary transformer device body, described at least two single-phase transformer device body and described auxiliary transformer device body are installed in described transformer tank body, each single-phase transformer device body includes a primary side winding and a pair vice-side winding, the primary side winding of described at least two single-phase transformer device body is drawn after parallel connection in described transformer tank body, vice-side winding and the described auxiliary transformer winding of described at least two single-phase transformer device body are individually drawn respectively in described transformer tank body。

2. common box type isolating transformer according to claim 1, it is characterised in that be connected to a pair outlet terminal after the primary side winding parallel connection of described at least two single-phase transformer device body。

3. common box type isolating transformer according to claim 1, it is characterised in that a pair vice-side winding of each single-phase transformer device body is connected to two pairs of outlet terminals of correspondence。

4. common box type isolating transformer according to claim 3, it is characterised in that the twice that logarithm is described single-phase transformer device body quantity of the outlet terminal that described at least two single-phase transformer device body vice-side winding is corresponding。

5. the common box type isolating transformer according to any one of claim 1-4, it is characterised in that the vice-side winding of described single-phase transformer device body adopts mutual decoupling structure between winding。

6. common box type isolating transformer according to claim 5, it is characterised in that described single-phase transformer device is as 5, and the vice-side winding of described single-phase transformer device body is 10。

7. common box type isolating transformer according to claim 5, it is characterised in that described at least two transformer body is identical。