CN103632820A - On-load adjustable capacity transformer low-voltage outgoing line structure - Google Patents

Abstract

The invention provides a low-voltage outlet structure of an on-load capacity-regulating transformer, which includes an iron core, a three-phase low-voltage winding, and a capacity-regulating switch. The low-voltage winding of each phase in the three-phase low-voltage winding includes a first winding, a second winding wire and the third winding, the three windings are wound on the core, forming three-layer distribution from the inside to the outside, the a3 end of the first winding is connected to the x2 end of the second winding, the three windings The coil outlet is drawn out along the axial direction of the iron core. The coil outlet and the coil outlet lead are arranged on the same side. The coil outlet is respectively connected to the corresponding contacts of the capacity adjustment switch through the coil outlet lead. The lead-out direction of the coil head is vertical. The invention minimizes the lead wire length, reduces load loss, and at the same time clamps the lead wire through the wire clamp, thereby increasing the mechanical strength of the product.

Description

A low-voltage outgoing line structure of an on-load capacity-adjusting transformer

technical field

The invention relates to the technical field of transformers, in particular to a low-voltage outgoing line structure of an on-load capacity regulating transformer.

Background technique

The size of the rural power grid load varies with the seasons. The power grid load is heavy during busy farming seasons, and the power grid load is small during slack seasons, which will bring difficulties to the selection of distribution transformers in rural power grids. If the capacity is selected to be large, the phenomenon of "big horse-drawn carts" will appear during the slack season. If the capacity is selected to be small, the transformer will burn out due to excessive load during the busy season. The load increases sharply. If the transformers in the mountainous countryside burn out at this time, it will not only greatly reduce the festive atmosphere, but also bring inconvenience to people's lives.

Now there is an on-load capacity regulating transformer on the market, which has two different sizes of capacity, which can be adjusted according to the size of the load. The basic design idea is: the three-phase high-voltage winding of the transformer is a triangle (D) when it has a large capacity, and it is a star (Y) when it is a small capacity.

The change of the connection mode of the high-voltage winding, the conversion of the parallel and series connection of the low-voltage winding and the adjustment of each tap part are all completed by a special on-load capacity regulating tap-changer. At the same time, when the large capacity is adjusted to the small capacity, due to the increase of the number of low-voltage turns, the magnetic flux density of the iron core is greatly reduced, so that the unit loss of the silicon steel sheet is reduced, and the no-load loss and no-load current are reduced to achieve the purpose of loss reduction and energy saving.

The on-load capacity regulating transformer not only leads to the end of the high-voltage winding (A, B, C, X, Y, Z) to the on-load capacity regulating switch, but also the head of the low-voltage winding (a1, b1, c1, x1, y1, z1, a2, b2, c2, x2, y2, z2) should also lead to the on-load capacity regulating switch. Due to the large number of low-voltage leads and the large cross-section, the arrangement of the leads and the way of the low-voltage outlet are very important. If the arrangement of the leads is improper or the way of the outlet is not well considered, it will increase the amount of leads or increase the load loss.

Contents of the invention

The purpose of the present invention is to overcome the deficiencies of the prior art, and provide a low-voltage outgoing line structure of an on-load capacity regulating transformer with reasonable and reliable design, which can minimize the length of lead wires, low load loss, and high mechanical strength.

In order to achieve the above object, the technical solution provided by the present invention is: a low-voltage outgoing line structure of an on-load capacity-adjusting transformer, which includes an iron core, a three-phase low-voltage winding and a capacity-regulating switch, and each phase of the three-phase low-voltage winding The low-voltage windings all include the first winding, the second winding and the third winding. The three sections of winding are wound on the iron core to form a three-layer distribution from the inside to the outside. The a3 end of the first winding is connected to the second winding. The x2 end of the coil is connected, the coil outlet of the three-section winding is drawn out along the axial direction of the iron core, the coil outlet and the coil outlet lead are arranged on the same side, and the coil outlet is connected to the corresponding contact of the capacity adjustment switch through the coil outlet lead respectively. The lead wires of the coil head run along the side of the coil, and their arrangement direction is perpendicular to the lead-out direction of the coil head.

The winding direction of the first winding is opposite to that of the second and third windings.

One end of the coil leading wire connected to the contact of the capacity regulating switch is connected with a lug through which the coil leading wire and the contact of the capacity regulating switch are connected.

The outgoing leads of the coil are clamped by the wire clamp, and the wire clamp is fixed on the clip.

The three-phase low-voltage windings include a-phase low-voltage windings, b-phase low-voltage windings, and c-phase low-voltage windings, wherein the a3 end of the first winding in the a-phase low-voltage winding is connected to the x2 end of the second winding, and the b-phase low-voltage winding The b3 end of the first winding is connected to the y2 end of the second winding, and the c3 end of the first winding in the c-phase low-voltage winding is connected to the z2 end of the second winding.

After adopting the above scheme, the present invention has the greatest advantages in that it can minimize the lead wire length and reduce the load loss, and at the same time clamp the lead wire through the wire clamp, thereby increasing the mechanical strength of the product.

Description of drawings

Fig. 1 is a structural schematic diagram of the present invention.

Fig. 2 is a schematic diagram of the middle and low voltage coils of the present invention.

Fig. 3 is a schematic diagram of low-voltage coil wiring in large capacity in the prior art.

Fig. 4 is a schematic diagram of low-voltage coil wiring in the case of small and medium capacity in the prior art.

Detailed ways

The present invention will be further described below in conjunction with specific examples.

Referring to accompanying drawings 1 to 4, the low-voltage outgoing line structure of the on-load capacity regulating transformer described in this embodiment includes an iron core 1, a three-phase low-voltage winding 2 and a capacity regulating switch 3, and the three-phase low-voltage winding 2 The a, b, and c-phase low-voltage windings all include the first winding 2-1, the second winding 2-2 and the third winding 2-3. The three windings are wound on the core 1, and the first winding The winding direction of 2-1 is opposite to the winding direction of the second and third winding wires 2-2 and 2-3, forming a three-layer distribution from the inside to the outside, and the a3 end of the first winding wire 2-1 in the a-phase low-voltage winding is connected to The x2 end of the second winding 2-2 is connected, the b3 end of the first winding 2-1 in the b-phase low-voltage winding is connected to the y2 end of the second winding 2-2, and the first winding 2 in the c-phase low-voltage winding The c3 end of -1 is connected to the z2 end of the second winding 2-2, the coil outlet 7 of the three-section winding is drawn out along the axial direction of the core 1, and the coil outlet 7 and the coil outlet lead 4 are arranged on the same side. The heads 7 are respectively connected to the corresponding contacts of the capacity regulating switch 3 through the coil leading wires 4, and one end of the connection between the coil leading wires 4 and the contacts of the capacity regulating switch 3 is connected with a wiring nose, and the coil leading wires 4 and the contacts of the capacity regulating switch 3 pass through the The wiring nose is connected, and the capacity adjustment switch 3 converts the size and capacity according to the load. The coil lead wire 4 runs along the side of the coil, and its arrangement direction is perpendicular to the direction of the coil lead 7, and the coil lead wire 4 is clamped by the wire clamp 5 Tight, and the wire clamp 5 is fixed on the clip 6. The invention can reduce the lead wire length to the greatest extent and reduce the load loss, and at the same time, the lead wire is clamped by the wire clamp, thereby increasing the mechanical strength of the product.

The implementation examples described above are only preferred embodiments of the present invention, and are not intended to limit the scope of the present invention. Therefore, all changes made according to the shape and principle of the present invention should be covered within the scope of protection of the present invention.

Claims (5)

1. A low-voltage outlet structure of an on-load capacity-regulating transformer, which includes an iron core (1), a three-phase low-voltage winding (2) and a capacity-regulating switch (3), characterized in that each phase of the three-phase low-voltage winding (2) The low-voltage windings each include a first winding (2-1), a second winding (2-2) and a third winding (2-3), and the three windings are wound on the core (1), from Three-layer distribution is formed from the inside to the outside. The coil head (7) of the three-section winding is drawn out along the axial direction of the iron core (1). The coil head (7) and the coil head lead (4) are arranged on the same side. The coil head ( 7) Connect to the corresponding contacts of the capacity adjustment switch (3) through the coil lead wires (4) respectively. The coil lead wires (4) run along the side of the coil, and their arrangement direction is perpendicular to the lead-out direction of the coil lead (7). 2. A low-voltage outgoing line structure of an on-load capacity regulating transformer according to claim 1, characterized in that: the winding direction of the first winding (2-1) is the same as that of the second and third windings (2-2, 2-3) in the opposite direction. 3. A low-voltage outgoing line structure of an on-load capacity regulating transformer according to claim 1, characterized in that: the end of the coil leading wire (4) connected to the contact of the capacity regulating switch (3) is connected with a terminal nose, and the coil The leading wire (4) is connected with the contact of the capacity regulating switch (3) through the terminal lug. 4. A low-voltage outgoing line structure of an on-load capacity regulating transformer according to claim 1, characterized in that: the lead wire (4) at the head of the coil is clamped by the wire clamp (5), and the wire clamp (5) is fixed on the clamp (6) on. 5. A low-voltage outlet structure of an on-load capacity regulating transformer according to claim 1, wherein the three-phase low-voltage winding (2) includes a-phase low-voltage winding, b-phase low-voltage winding and c-phase low-voltage winding, wherein , the a3 end of the first winding (2-1) in the a-phase low-voltage winding is connected to the x2 end of the second winding (2-2), and the b3 end of the first winding (2-1) in the b-phase low-voltage winding It is connected to the y2 end of the second winding wire (2-2), and the c3 end of the first winding wire (2-1) in the c-phase low-voltage winding is connected to the z2 end of the second winding wire (2-2).

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