Body structure of V-V type wiring three-phase combined mutual inductor

Abstract

The utility model discloses a V-V type wiring three-phase combined mutual inductor body structure which comprises two sets of identical current and voltage connecting rods, two sets of identical connecting pieces and a B-phase conducting rod, one end of one set of current and voltage connecting rods is connected with a primary winding of an A-phase current coil, and the other end of one set of current and voltage connecting rods is connected with a primary winding of an A-B voltage coil through the connecting pieces. One end of the other group of current and voltage connecting rods is connected with a primary winding of a phase-C current coil, the other end of the other group of current and voltage connecting rods is connected with a primary winding of a phase-B voltage coil through a connecting sheet, and the two groups of current and voltage connecting rods are opposite in direction; and the other end of the primary winding is respectively connected with the A-B voltage coil primary winding and the B-C voltage coil primary winding through metal sheets. Therefore, the appearance size of the mutual inductor is reduced, and the appearance of the mutual inductor does not need to specially consider the fixing problem of the primary winding of the voltage coil, so that the appearance of the mutual inductor can meet the special requirements of customers.

Description

Technical Field

[0001] The utility model relates to the technical field of combined mutual inductors, in particular to a VV-type connection three-phase combined mutual inductor body structure, which realizes miniaturization of the mutual inductor. Background Art

[0002] The VV type connection current and voltage combination transformer is a combination transformer that contains at least two current coils and two voltage coils. The wiring schematic is as follows: Figure 1 As shown in Figure 1, a VV-connected current-voltage combination transformer has one primary current winding for each phase A and C, and one or more secondary current windings. The primary voltage windings AB and BC are connected to the primary current winding via leads, and the secondary voltage winding is wrapped around the voltage core.

[0003] Based on the requirements of transformer insulation, there must be sufficient insulation distance between all high-voltage and low-voltage terminals of VV type connection current and voltage combination transformers, such as Figure 1 As shown, the A and C phase current primary windings and the AB and BC voltage primary windings are at high voltage and equal potential, and the A and C phase current secondary windings and voltage secondary windings are at low potential.

[0004] Our traditional approach previously involved fixing the primary and secondary windings of the A and C phase current coils, as well as the primary and secondary windings of the voltage coil, separately during mold assembly. Conductors were then used to connect the primary winding of the A phase current coil to the primary windings of the AB voltage coils; and conductors were used to connect the primary winding of the C phase current coil to the primary winding of the BC voltage coils. This approach was simple and reliable, but the transformer mold required fixed positions for the primary and secondary windings of the current coils and the primary and secondary windings of the voltage coils. Consequently, current and voltage combination transformers using this traditional VV-type wiring often had a relatively fixed appearance and were larger in size.

[0005] With the customer's pursuit of miniaturization of electrical components and the market demand for special-shaped transformers, the traditional transformers often cannot meet customer needs in terms of volume and appearance. This requires a VV-type wiring current and voltage combination transformer with a body structure to solve this problem. Summary of the Invention

[0006] The purpose of the utility model is to provide a VV-type wiring current-voltage combination transformer body structure, which can achieve transformer miniaturization and special shape requirements while meeting transformer insulation requirements.

[0007] To achieve the above-mentioned objectives, the present invention adopts the following technical solutions: a VV-type connection three-phase combination transformer body structure, comprising two groups of identical current and voltage connecting rods and two groups of identical connecting plates and B-phase conductive rods, wherein one end of one group of current and voltage connecting rods is connected to the primary winding of the A-phase current coil, and the other end is connected to the primary winding of the AB voltage coil through the connecting plate; one end of the other group of current and voltage connecting rods is connected to the primary winding of the C-phase current coil, and the other end is connected to the primary winding of the BC voltage coil through the connecting plate; the two groups of current and voltage connecting rods are in opposite directions; one end of the B-phase conductive rod is connected to the embedded nut of the B-direction primary output line, and the other end is connected to the primary winding of the AB voltage coil and the primary winding of the BC voltage coil respectively through metal plates.

[0008] Preferably, the current and voltage connecting rods are connected to the connecting pieces using nuts.

[0009] Preferably, the connecting piece is made of metal material.

[0010] Preferably, one end of the connecting piece connected to the current and voltage connecting rod is formed into a long strip opening.

[0011] Preferably, the metal sheet and the connecting sheet are bilaterally symmetrical on the primary windings of the A and C current coils.

[0012] Compared with the prior art, the beneficial effects of the present invention are as follows: in the VV-type wiring current-voltage combination transformer of the utility model, the primary winding of the voltage coil can be fixed on the mold through the current-voltage connecting rod and the B-phase conductive rod, and does not need to be fixed on the transformer mold separately. This reduces the external dimensions of the transformer and also makes it unnecessary to specifically consider the problem of fixing the primary winding of the voltage coil in the external shape of the transformer, so that the external shape of the transformer can meet the special requirements of customers. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is the wiring schematic diagram of the VV type current and voltage combination transformer.

[0014] Figure 2 This is a schematic diagram of the current and voltage connecting rod of the utility model.

[0015] Figure 3 This is a schematic diagram of the connecting piece of the present invention.

[0016] Figure 4 This is a schematic diagram of the B-phase conductive rod assembly of the present invention.

[0017] Figure 5 This is a schematic diagram of the structure of the VV type wiring current and voltage combiner of the present utility model.

[0018] Markings in the figure: 1-B phase primary wire embedded nut, 2-B phase conductive rod, 3-metal sheet, 4-connecting plate, 5-nut, 6-current and voltage connecting rod, 7-A phase current coil primary winding, 8-A phase current coil secondary winding, 9-C phase current coil primary winding, 10-C phase current coil secondary winding, 11-AB voltage coil primary winding, 12-AB voltage coil secondary winding, 13-BC voltage coil primary winding, 14-BC voltage coil secondary winding. DETAILED DESCRIPTION

[0019] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0020] The conductor connecting the primary current windings of phases A and C in a VV-connected current-voltage combination transformer to the primary voltage winding is constructed into a strong rod-like structure with a threaded end (hereinafter referred to as the current-voltage connecting rod 6). The conductor connecting the primary windings of the AB and BC voltage coils to the primary current winding is constructed into an open-hole sheet-like structure (hereinafter referred to as the connecting sheet 4) that can be threadedly connected to the current-voltage connecting rod 6. The primary outgoing conductor at the common terminal B of the primary coils of voltage coils AB and BC is constructed into a strong rod-like structure (hereinafter referred to as the B-phase conductive rod 2). The specific structure is as follows: a VV-type connection three-phase combination transformer body structure, including two sets of identical current and voltage connecting rods 6 and two sets of identical connecting plates 4 and B-phase conductive rods 2. One end of one set of current and voltage connecting rods 6 is connected to the A-phase current coil primary winding 7, and the other end is connected to the AB voltage coil primary winding 11 through the connecting plate 4. One end of the other set of current and voltage connecting rods 6 is connected to the C-phase current coil primary winding 9, and the other end is connected to the BC voltage coil primary winding 13 through the connecting plate 4. The two sets of current and voltage connections 6 are in opposite directions. One end of the B-phase conductive rod 2 is connected to the embedded nut 1 of the B-direction primary output line, and the other end is connected to the AB voltage coil primary winding 11 and the BC voltage coil primary winding 13 through the metal plate 3. The current and voltage connecting rods 6 and the connecting plates 4 are connected using nuts 5.

[0021] Reference Figure 2 One end of the current-voltage connecting rod 6 is welded to the primary winding of the current coil, and the other end is threaded and fixed to the connecting piece 4 using a nut 5. The current-voltage connecting rod 6 is made according to the specified dimensions and is made of metal with a strength that can support the primary winding of the voltage coil for a long time without deformation.

[0022] Reference Figure 3 The connecting piece 4 is made of a metal material with a certain strength, and one end is buckled on the primary winding of the voltage coil. The connecting piece 4 is made according to the specified size. The strength of the metal material can support the primary winding of the voltage coil for a long time without deformation. The hole that cooperates with the current and voltage connecting rod 6 is preferably a long strip hole.

[0023] Reference Figure 4 Schematic diagram of the B-phase conductive rod assembly. One end of the B-phase conductive rod 2 is welded to the B-phase primary wire nut 1, and the other end is welded to a metal sheet 3 connected to the primary winding of the voltage coil. The metal sheet 3 and the connecting sheet 4 are symmetrically positioned on the primary winding of the wire coil, achieving force balance. The B-phase primary wire nut 1 in the B-phase conductive rod 2 assembly is coated and has inherent anti-pullout and anti-drilling measures. The B-phase conductive rod 2 is strong enough to support the primary winding of the voltage coil for a long time without deformation. The metal sheet 3 is also strong enough to support the primary winding of the voltage coil for a long time without deformation.

[0024] Reference Figure 5 A schematic diagram of the VV-type current-voltage combination structure shows the combined structure of two current coils and two voltage coils. The primary windings of the A and C phase current coils are securely welded to the current-voltage connecting rod 6 in opposite directions. The connecting rod 6 is connected to the connecting piece 4 and secured with a nut 5. The B phase conductive rod 2 is welded to the embedded nut 1 for the B-direction primary conductor and then welded to the primary windings of the AB and BC voltage coils, respectively.

[0025] When assembling the mold, connect the opening of the connecting piece 4 to the thread of the current and voltage connecting rod 6, and use the nut 5 to fix it firmly. Weld the B-phase conductive rod 2 and the embedded nut 1 of the B-direction primary output line, and then weld them to the primary windings of the AB and BC voltage coils respectively. In this way, the primary windings of the AB and BC voltage coils are firmly fixed on the transformer mold through the support and positioning of the A and C phase current and voltage connecting rods 6 and the B phase conductive rod 2.

[0026] The secondary winding of the current coil includes the A-phase current coil secondary winding 8, and the C-phase current coil primary winding 9 is hoisted separately. The secondary winding of the voltage transformer includes the AB voltage coil primary winding 11 and the BC voltage coil secondary winding 14 together with the voltage core, and the voltage core is hoisted separately.

[0027] In the VV-type wiring current-voltage combination transformer of the utility model, the primary winding of the voltage coil can be fixed on the mold through the current-voltage connecting rod 6 and the B-phase conductive rod 2, and does not need to be fixed on the transformer mold separately. This reduces the external dimensions of the transformer and also makes it unnecessary to specially consider the fixation problem of the primary winding of the voltage coil in the external shape of the transformer, so that the external shape of the transformer can meet the special requirements of customers.

[0028] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and improvements are intended to fall within the scope of the present invention. The scope of protection claimed in this invention is defined by the appended claims and their equivalents.

Claims

1. A VV-type connection three-phase combination transformer body structure, characterized by: The invention comprises two groups of identical current and voltage connecting rods (6), two groups of identical connecting plates (4) and a B-phase conductive rod (2), wherein one end of one group of current and voltage connecting rods (6) is connected to the primary winding (7) of the A-phase current coil, and the other end is connected to the primary winding (11) of the AB voltage coil via the connecting plate (4); one end of the other group of current and voltage connecting rods (6) is connected to the primary winding (9) of the C-phase current coil, and the other end is connected to the primary winding (13) of the BC voltage coil via the connecting plate (4); the two groups of current and voltage connecting rods (6) are in opposite directions; one end of the B-phase conductive rod (2) is connected to the embedded nut (1) of the B-direction primary output line, and the other end is connected to the primary winding (11) of the AB voltage coil and the primary winding (13) of the BC voltage coil via the metal plate (3).

2. A VV-type connection three-phase combination transformer body structure according to claim 1, characterized in that: The current and voltage connecting rod (6) is connected to the connecting piece (4) by using a nut (5).

3. The VV-type connection three-phase combination transformer body structure according to claim 1, characterized in that: The connecting piece (4) is made of metal material.

4. The VV-type connection three-phase combination transformer body structure according to claim 3, characterized in that: One end of the connecting piece (4) connected to the current and voltage connecting rod (6) is formed into a long strip opening.

5. The VV-type connection three-phase combination transformer body structure according to claim 3, characterized in that: The metal sheet (3) and the connecting sheet (4) are symmetrical on the left and right of the primary windings of the A and C current coils.

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