CN220774100U - Voltage regulating circuit of transformer - Google Patents

Abstract

The utility model discloses a transformer voltage regulating circuit. Wherein the circuit comprises: the winding coil is formed by two wires which are spirally wound in parallel; the first end of a first strand of wire in the winding coil is connected to a first binding post, the tail end of the first strand of wire and the head end of a second strand of wire are connected to a second binding post, the tail end of the second strand of wire is connected to a third binding post, and the first binding post, the second binding post and the third binding post are arranged outside the winding coil and are connected with the winding coil through an external wire. According to the utility model, the problems of abnormal radial size of the coil and cracking of the welding spots caused by more connecting welding spots between the coils and poor welding spot quality in the related technology are solved, and the voltage regulation operation of the coil is further affected.

Description

Voltage regulating circuit of transformer

Technical Field

The utility model relates to the field of voltage regulation of transformers, in particular to a voltage regulating circuit of a transformer.

Background

The voltage regulating coil of the high-capacity and high-voltage-class power transformer has the advantages that the sectional areas of the conventional flat wires and the combined wires cannot meet the current-carrying requirement due to larger current, therefore, CTC (Continuously Transposed Conductor, continuous transposed wires) wires are required to be wound, and the voltage regulating coil is required to withstand high surge voltage level due to the high-voltage-class power transformer product, so that the surge voltage level of the conventional continuous coil cannot be met, and a intertwined winding coil structure is required to be adopted.

However, when the conventional intertwined coil is wound using CTC wires, there are many welding spots between the coils, the radial size of the coil exceeds the size requirement at the welding site, and the voltage regulation operation of the coil cannot be normally performed due to the cracking of the welding spots because of poor welding quality of part of the welding spots.

Aiming at the problems that in the related art, as the number of connecting welding spots between coils is large and the quality of the welding spots is poor, the radial size of the coils is abnormal and the welding spots are cracked, so that the voltage regulation operation of the coils is influenced, no effective solution is proposed at present.

Disclosure of Invention

The utility model provides a transformer voltage regulating circuit which solves the problems that in the related art, due to the fact that the number of connecting welding spots between coils is large and the quality of the welding spots is poor, the radial size of the coils is abnormal, the welding spots are cracked, and then the voltage regulating operation of the coils is affected.

According to one aspect of the present utility model, a transformer voltage regulation circuit is provided. The circuit comprises: the transformer comprises a winding coil, a first connecting terminal, a second connecting terminal and a third connecting terminal, wherein the winding coil is arranged outside a transformer core, the winding coil is composed of N layers of pancake coils, the N layers of pancake coils are composed of two wires which are spirally wound in parallel, and N is more than or equal to 2; the first binding post is connected to the head end of first strand wire in the winding coil, and the tail end of first strand wire is connected at the second binding post with the head end of second strand wire, and the tail end connection of second strand wire is at the third binding post, and first binding post, second binding post and third binding post set up in the outside of winding coil, are connected through the outside wire with the winding coil.

Optionally, the first connection terminal, the second connection terminal, and the third connection terminal are connected to an on-load tap-changer.

Alternatively, the two wires between adjacent layers of pancake coils are oppositely wound.

Optionally, an oil duct cushion layer is arranged between adjacent layers of cake-type coils.

Alternatively, the number of turns in adjacent pancake coils are set to be the same or different.

Alternatively, in the case where the number of turns of the coils in the adjacent pancake coils is different, the backing strip is provided in the pancake coil layer having the smaller number of turns in the adjacent pancake coil.

Optionally, the wire is a continuously transposed winding wire.

Optionally, the transformer voltage regulating circuit includes a plurality of winding coils, wherein the plurality of winding coils are sequentially disposed outside the transformer core.

Optionally, the third connection terminal of the former winding coil of the two adjacent winding coils is connected with the first connection terminal of the latter winding coil.

Optionally, the first connection terminal, the second connection terminal, and the third connection terminal in each of the plurality of winding coils are connected to an on-load tap-changer.

By the utility model, the following steps are adopted: the transformer comprises a winding coil, a first connecting terminal, a second connecting terminal and a third connecting terminal, wherein the winding coil is arranged outside a transformer core, the winding coil is composed of N layers of pancake coils, the N layers of pancake coils are composed of two wires which are spirally wound in parallel, and N is more than or equal to 2; the first binding post is connected to the head end of first strand wire in the winding coil, and the tail end of first strand wire is connected at the second binding post with the head end of second strand wire, and the tail end connection of second strand wire is at the third binding post, and first binding post, second binding post and third binding post set up in the outside of winding coil, are connected through the outside wire with the winding coil. The problems that in the related art, due to the fact that the number of connecting welding spots between the coils is large, and the quality of the welding spots is poor, the radial size of the coils is abnormal, the welding spots are cracked, and then the voltage regulation operation of the coils is affected are solved. Through with the coil in the winding coil and the former solder joint position between the coils remove outside the coil to can avoid carrying out welding operation in the coil through wire connection's mode, can also control two coils that two strands of wires were wound respectively through the break-make between the control binding post simultaneously, and then reached the accuracy of guaranteeing the radial size of coil, can also reach the effect of nimble access coil simultaneously.

Drawings

The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the utility model. In the drawings:

fig. 1 is a schematic diagram of a voltage regulating circuit of a transformer according to an embodiment of the present utility model.

Fig. 2 is a schematic diagram of an alternative transformer voltage regulating circuit provided in accordance with an embodiment of the present utility model.

101, a transformer core; 201. a winding coil; 301. a first connection terminal; 302. a second connection terminal; 303. a third connection terminal; 401. an external wire; 501. an oil passage cushion layer; 601. a filler strip; 701. on-load tap changer.

Detailed Description

It should be noted that, without conflict, the embodiments of the present utility model and features of the embodiments may be combined with each other. The utility model will be described in detail below with reference to the drawings in connection with embodiments.

In order that those skilled in the art will better understand the present utility model, a technical solution in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present utility model, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present utility model without making any inventive effort, shall fall within the scope of the present utility model.

It should be noted that the terms "first," "second," and the like in the description and the claims of the present utility model and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate in order to describe the embodiments of the utility model herein.

According to an embodiment of the present utility model, a transformer voltage regulating circuit is provided.

Fig. 1 is a schematic diagram of a voltage regulating circuit of a transformer according to an embodiment of the present utility model. As shown in fig. 1, the circuit includes:

the transformer comprises a winding coil 201, a first connecting terminal 301, a second connecting terminal 302 and a third connecting terminal 303, wherein the winding coil 201 is arranged outside the transformer core 101, the winding coil 201 is formed by N layers of pancake coils, the N layers of pancake coils are formed by two wires which are spirally wound in parallel, and N is more than or equal to 2; the first end of the first strand of wire in the winding coil 201 is connected to the first connection terminal 301, the tail end of the first strand of wire is connected to the second connection terminal 302 with the head end of the second strand of wire, the tail end of the second strand of wire is connected to the third connection terminal 303, and the first connection terminal 301, the second connection terminal 302 and the third connection terminal 303 are arranged outside the winding coil 201 and are connected with the winding coil 201 through the external wire 401.

The winding coil 201 in fig. 1 is wound around the transformer core 101, and as the secondary side of the transformer, the voltage value obtained by regulating the high voltage on the primary side is determined according to the number of turns of the access coil, and since the winding coil 201 is formed of two wires wound in a spiral shape in parallel, after the winding is completed, there are two groups of contacts, namely, a contact 1 wound with the first wire, a contact 9 wound with the first wire, a contact 1 'wound with the second wire, and a contact 9' wound with the first wire.

Further, in order to avoid the connection between two wires by welding, the contact 1 and the first connection terminal 301 may be connected by using an external wire 401, the contact 9 and the contact 1 'may be connected by using an external wire 401, and the contact 9' and the third connection terminal 303 may be connected by using an external wire 401, so that the contacts of the wires in the winding may be connected by using the external wire 401, and welding of the contacts may not be required, thereby ensuring the stability of contact connection.

It should be noted that, 1-9 in the drawing are sectional views of different layers of the first wire after winding is completed, that is, 1-9 is a first wire, and 1'-9' is a sectional view of the second wire, and when a conventional intertwined coil is wound, the contact 9 of the first wire and the contact 1 'of the second wire in the drawing are required to be connected by welding, so in order to eliminate welding spots in the coil, the contact 9 of the first wire and the contact 1' of the second wire can be connected by using an external wire 401, and the external wire 401 is used to draw out to the second connection terminal 302, so that an effect of connecting the two coils outside the coil is achieved, the connected coil still has the electromagnetic characteristics of the intertwined coil, and the surge voltage tolerance level of the surge voltage regulating coil is higher.

The transformer voltage regulating circuit provided by the embodiment of the utility model is characterized in that a winding coil 201, a first wiring terminal 301, a second wiring terminal 302 and a third wiring terminal 303 are used, wherein the winding coil 201 is arranged outside a transformer core 101, the winding coil 201 is formed by N layers of pancake coils, and the N layers of pancake coils are formed by two wires which are spirally wound in parallel, wherein N is more than or equal to 2; the first end of the first strand of wire in the winding coil 201 is connected to the first connection terminal 301, the tail end of the first strand of wire is connected to the second connection terminal 302 with the head end of the second strand of wire, the tail end of the second strand of wire is connected to the third connection terminal 303, and the first connection terminal 301, the second connection terminal 302 and the third connection terminal 303 are arranged outside the winding coil 201 and are connected with the winding coil 201 through the external wire 401. The problems that in the related art, due to the fact that the number of connecting welding spots between the coils is large, and the quality of the welding spots is poor, the radial size of the coils is abnormal, the welding spots are cracked, and then the voltage regulation operation of the coils is affected are solved. Through with the former solder joint position between coil in winding coil 201 and the coil outside to can avoid carrying out welding operation in the coil through wire connection's mode, can also control two coils that two strands of wires were wound respectively through the break-make between the control binding post simultaneously, and then reached the accuracy of guaranteeing the radial size of coil, can also reach the effect of nimble access coil simultaneously.

Optionally, the first connection terminal 301, the second connection terminal 302, and the third connection terminal 303 are connected to the on-load tap-changer 701.

Specifically, since the voltage regulation magnitude can be controlled by using the first connection terminal 301, the second connection terminal 302, and the third connection terminal 303, that is, the voltage value between the first connection terminal 301 and the third connection terminal 303 is twice the voltage value between the first connection terminal 301 and the second connection terminal 302, and between the second connection terminal 302 and the third connection terminal 303, the voltage value at both ends of the on-load tap-changer 701 can be regulated by changing the connection terminals connected to the on-load tap-changer 701, and thus the voltage regulation operation on the voltage received at both ends of the on-load tap-changer 701 can be completed.

For example, the fixed contact in the on-load tap-changer 701 may be connected to the first connection terminal 301, and the movable contact may be connected to any one of the second connection terminal 302 and the third connection terminal 303, so that the voltage value between the movable contact and the fixed contact of the on-load tap-changer may be changed by controlling the connection condition between the movable contact and the second connection terminal 302 and the third connection terminal 303, thereby achieving the voltage regulation effect.

Optionally, in the voltage regulating circuit of the transformer provided by the embodiment of the utility model, two wires between adjacent layers of pancake coils are opposite in relative winding position.

Specifically, in fig. 1, when the wires are wound, in the case of changing the number of layers, for example, from a first layer to a second layer, the radial relative position between the two wires needs to be changed, as shown in fig. 1, where the first wire in the first layer is on the right side (1 on the right side) of the second wire and the first wire is on the left side (3 on the left side) of the second wire in the second layer, so that the winding of the intertwined coil is completed.

Optionally, in the transformer voltage regulating circuit provided by the embodiment of the present utility model, an oil channel pad layer 501 is disposed between adjacent pancake coils.

Specifically, when conducting wire winding, an oil passage cushion layer 501, such as an oil passage cushion block or an oil passage cushion piece, needs to be added between each layer of wire cake, so that insulation is carried out between different layers of wires, and heat dissipation is carried out on the transformer coil.

Alternatively, the number of turns in adjacent pancake coils are set to be the same or different.

Specifically, when the coil is wound, the number of turns of the coil in each layer of pancake winding can be unified, for example, the number of turns of the coil in each layer of pancake winding is 5 turns, so that the radial dimension of each layer of pancake winding in the coil is ensured to be consistent.

Alternatively, in the case where the number of turns of coils in the adjacent pancake coils is different, the filler strip 601 is provided in the pancake coil layer having the smaller number of turns in the adjacent pancake coil.

Also, in some cases, the number of turns in a certain layer or layers of pancake windings may not be identical to the number of turns in other layers, as shown in fig. 1, in the first layer and the second layer of pancake windings from bottom to top, the number of turns in the first layer is 4 turns, and the number of turns in the second layer is 5 turns, at this time, since the number of turns between the adjacent layers is different, in order to ensure that the radial dimensions of the coils are identical, the filler strip 601 in fig. 1 may be used to fill between the wires, for example, the paper filler strip 601 or the chain filler strip 601, so that insulation can be performed between the wires, heat dissipation can be performed on the transformer coil, and the radial dimensions of the coils can be kept identical.

Optionally, in the voltage regulating circuit of the transformer provided by the embodiment of the utility model, the wire is a continuously transposed winding wire.

Specifically, the wound wire used in the present utility model is a CTC wire.

Alternatively, in the transformer voltage regulating circuit provided by the embodiment of the present utility model, the transformer voltage regulating circuit includes a plurality of winding coils 201, where the plurality of winding coils 201 are sequentially disposed outside the transformer core 101.

Specifically, fig. 2 is a schematic diagram of an alternative voltage regulating circuit of a transformer according to an embodiment of the present utility model, as shown in fig. 2, multiple groups of winding coils 201 may be wound on a transformer core, so that more voltage regulating voltages may be provided, that is, the number of voltage regulating voltages may be increased by increasing the number of connected winding coils 201.

Optionally, in the voltage regulating circuit of the transformer provided in the embodiment of the present utility model, the third connection terminal 303 of the previous winding coil 201 of the two adjacent winding coils 201 is connected to the first connection terminal 301 of the next winding coil 201.

Specifically, in order to ensure normal connection between winding coils, the third connection terminal 303 of the previous winding coil 201 in two adjacent winding coils 201 may be connected with the first connection terminal 301 of the next winding coil 201, so that the two winding coils 201 are connected in series by the connection point, so that a loop is formed between the two winding coils 201, and meanwhile, the contact on the two winding coils 201 is prevented from being connected in a welding manner, but the two winding coils 201 are connected in series by the connection manner of the external wire 401 connected with the contact, so that the radial dimension of the winding is ensured to meet the requirement, and meanwhile, the connection stability between the windings is improved.

Optionally, the first connection terminal 301, the second connection terminal 302, the third connection terminal 303 in each winding coil 201 of the plurality of winding coils 201 are connected to an on-load tap-changer.

Specifically, since the voltage regulation can be controlled by using the first connection terminal 301, the second connection terminal 302, and the third connection terminal 303, in the case of having a plurality of winding coils 201, the voltage values at the two ends of the on-load tap-changer 701 can be adjusted by changing the connection terminals connected to the movable contacts in the on-load tap-changer, so as to complete the voltage regulation operation on the voltages received at the two ends of the on-load tap-changer 701.

For example, in fig. 2, a stationary contact of the on-load tap-changer 701 may be connected to the first connection terminal 301 of the lower winding coil 201, a movable contact may be connected to the third connection terminal 303 of the upper winding coil 201, a voltage value between the movable contact and the stationary contact of the on-load tap-changer 701 is 4U, at this time, the movable contact of the on-load tap-changer 701 is moved from the third connection terminal 303 of the upper winding coil 201 to the second connection terminal 302 of the upper winding coil 201, and a voltage value between the movable contact and the stationary contact of the on-load tap-changer 701 is 3U, so that the voltage value between the movable contact and the stationary contact of the on-load tap-changer may be changed by controlling the connection condition of the movable contact and the stationary contact, thereby achieving a voltage regulation effect.

The following steps are the winding and production steps of the transformer voltage regulating circuit of the utility model:

the arrangement of the wires is shown in fig. 1, the cake of the lowest wire is the first cake, the connecting wire 1 and the correction wire 1 'are connected in parallel to start winding, the winding method operates as the reverse cake winding of the continuous coil, the contact 1 and the contact 1' are tapped at the leading end of the surface of the 1 st cake, the bottom S bending transposition of all the wires is completed at the inner diameter side of the coil, and a paper filler strip or a chain filler strip is filled in the middle of the radial direction of the coil during winding.

After the bottom S bending position of all the wires of the 1 st cake is finished, an inter-cake oil duct cushion block is placed, the winding of the 2 nd cake is continued, the 2 nd cake is a positive cake, the operation is the same as the winding of the positive cake of the continuous coil during the winding, the surface S bending position of all the wires is finished on the outer diameter side of the coil, the bottom S bending position of all the wires is finished on the outer diameter side of the coil, and a paper filler strip or a chain filler strip is filled in the radial middle part of the coil during the winding.

After the surface S bending position of all the wires of the 2 nd cake is completed, placing an oil duct cushion block, continuing the winding of the 3 rd cake, wherein the 3 rd cake is a reverse cake, and operating the same as the reverse cake winding of the continuous coil during the winding, completing the bottom S bending position of all the wires at the inner diameter side of the coil, and filling a paper cushion strip or a chain cushion strip in the radial middle during the winding.

After the bottom S bending position of all the wires of the 3 rd cake is completed, placing an oil duct cushion block, continuing the winding of the 4 th cake, wherein the 4 th cake is a positive cake, and the winding is operated in the same way as the winding of the positive cake of the continuous coil, but the outer diameter side of the coil has no surface S bending position, and the surface of the 4 th cake is directly sheared and led out, so that the contact 9 and the contact 9' are tapped from the tail end, thereby completing the winding operation of the circuit in FIG. 1.

After winding is completed, the contact 1 is connected with the first wiring terminal 301 by using an external wire 401, the contact 9 is connected with the contact 1 'by using the external wire 401, and the contact 9' is connected with the third wiring terminal 303 by using the external wire 401, so that the contacts of wires in the winding can be connected by using the external wire 401, welding of the contacts is not required, and the stability of contact connection is ensured.

The foregoing is merely exemplary of the present utility model and is not intended to limit the present utility model. Various modifications and variations of the present utility model will be apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the utility model are to be included in the scope of the claims of the present utility model.

Claims (10)

1. A transformer voltage regulating circuit, comprising: a winding coil (201), a first connecting terminal (301), a second connecting terminal (302) and a third connecting terminal (303), wherein,

the winding coil (201) is arranged outside the transformer core (101), the winding coil (201) is composed of N layers of pancake coils, the N layers of pancake coils are composed of two wires wound in parallel spiral, and N is more than or equal to 2;

the first end of a first strand of wire in the winding coil (201) is connected to a first wiring terminal (301), the tail end of the first strand of wire and the head end of a second strand of wire are connected to a second wiring terminal (302), the tail end of the second strand of wire is connected to a third wiring terminal (303), and the first wiring terminal (301), the second wiring terminal (302) and the third wiring terminal (303) are arranged outside the winding coil (201) and connected with the winding coil (201) through an external wire (401).

2. The transformer voltage regulating circuit according to claim 1, wherein the first connection terminal (301), the second connection terminal (302), the third connection terminal (303) are connected to an on-load tap changer (701).

3. The transformer voltage regulator circuit of claim 1, wherein the two wires between adjacent pancake coils are oppositely wound.

4. The transformer voltage regulating circuit of claim 1, wherein an oil passage pad layer (501) is provided between adjacent pancake coils.

5. The transformer voltage regulating circuit of claim 1, wherein the number of turns in adjacent pancake coils are set to be the same or different.

6. The transformer voltage regulating circuit according to claim 5, wherein, in case of different numbers of turns in the pancake coils of the adjacent layers, a filler strip (601) is provided in the pancake coil layer having the smaller number of turns in the pancake coil of the adjacent layers.

7. The transformer voltage regulator circuit of claim 1, wherein the wire is a continuously transposed winding wire.

8. The transformer voltage regulating circuit according to claim 1, wherein the transformer voltage regulating circuit comprises a plurality of winding coils (201), wherein the plurality of winding coils (201) are sequentially arranged outside the transformer core (101).

9. The transformer voltage regulating circuit according to claim 8, wherein the third connection terminal (303) of the preceding winding coil (201) of the two adjacent winding coils (201) is connected to the first connection terminal (301) of the following winding coil (201).

10. The transformer voltage regulating circuit of claim 8, wherein the first connection terminal (301), the second connection terminal (302), the third connection terminal (303) in each winding coil (201) of the plurality of winding coils (201) are connected to an on-load tap changer (701).