Three-phase transformer multi-path parallel voltage regulation circuit, three-phase transformer and electrical equipment

Abstract

The utility model provides a three-phase transformer multipath parallel voltage regulating circuit, a three-phase transformer and electrical equipment, and relates to the technical field of transformer equipment, each current-carrying loop of the three-phase transformer is divided into a plurality of current-carrying loop sections, each current-carrying loop section is provided with a plurality of taps, and meanwhile, the current-carrying loop sections are connected in parallel. A voltage regulating switch is configured for two adjacent current-carrying loop sections, the connection state of taps between the two adjacent current-carrying loop sections can be regulated through the voltage regulating switch, the connected taps are different, the number of turns of coils in the current-carrying loop is different, and therefore voltages output by the multi-path parallel voltage regulating circuit of the three-phase transformer are different. The multi-path parallel voltage regulation circuit of the three-phase transformer can provide adjustable voltage according to load requirements.

Description

Technical Field

[0001] The utility model relates to the technical field of transformer equipment, in particular to a three-phase transformer multi-channel parallel voltage regulating circuit, a three-phase transformer and electrical equipment. Background Art

[0002] Three-phase transformers are essential devices widely used in power systems. Their primary function is to transform voltage and transfer energy through the principle of electromagnetic induction. A three-phase transformer consists of three independent windings connected to a three-phase AC power source via various configurations (such as star or delta) and outputs a corresponding three-phase voltage. They primarily consist of an iron core (or magnetic core) and coils, including a primary coil (also known as the primary winding) and a secondary coil (also known as the secondary winding). The operating principle of a three-phase transformer is based on the law of electromagnetic induction. When an AC voltage is applied to the primary winding of the transformer, an AC current flows through it, generating magnetization. This excitation creates an alternating magnetic flux in the core. This alternating magnetic flux passes through both the primary and secondary windings, inducing an induced electromotive force (EMF) in each winding. The magnitude of the induced EMF is proportional to the rate of change of the magnetic flux, and its direction follows Lenz's law. When the secondary winding is connected to an external load, an AC current flows, generating electrical energy output.

[0003] Different loads on a three-phase transformer require different voltages, which in turn requires the three-phase transformer to provide different voltages. However, the three-phase transformers in existing solutions usually only provide a fixed output voltage. The corresponding type of three-phase transformer needs to be selected based on the voltage requirements of the load. There is a lack of a three-phase transformer that can provide different voltages for the load. Utility Model Content

[0004] In view of this, an embodiment of the present invention provides a three-phase transformer multi-channel parallel voltage regulation circuit, a three-phase transformer and an electrical device, so as to realize a three-phase transformer capable of providing different voltages to a load.

[0005] To achieve the above objectives, the present invention provides the following technical solutions:

[0006] A three-phase transformer multi-channel parallel voltage regulation circuit, comprising:

[0007] A phase coil, a B phase coil and a C phase coil, each phase coil includes a current-carrying circuit;

[0008] The current-carrying loop includes X current-carrying loop segments, each current-carrying loop segment includes N taps, and X and N are positive integers not less than 2;

[0009] X-1 voltage-regulating switches, each voltage-regulating switch corresponds to two adjacent current-carrying loop segments, and the voltage-regulating switch is used to switch the connection state between a first target tap and a second target tap, the first target tap being a tap of one of the two adjacent current-carrying loop segments, and the second target tap being a tap of the other current-carrying loop segment.

[0010] Optionally, in the above three-phase transformer multi-channel parallel voltage regulation circuit, the value of X is 2;

[0011] The current-carrying loop includes a first current-carrying loop section and a second current-carrying loop section;

[0012] The voltage regulating switch is used to switch the connection state between a first target tap and a second target tap, the first target tap is a tap in the first current-carrying loop segment, and the second target tap is a tap in the second current-carrying loop segment.

[0013] Optionally, in the above-mentioned three-phase transformer multi-parallel voltage-regulating circuit, the current-carrying circuit includes: a primary coil current-carrying circuit and a secondary coil current-carrying circuit, at least one of the primary coil current-carrying circuit and the secondary coil current-carrying circuit includes the first current-carrying circuit segment and the second current-carrying circuit segment, and each sub-current-carrying circuit corresponds to a voltage-regulating switch.

[0014] Optionally, in the above-mentioned three-phase transformer multi-channel parallel voltage regulation circuit, each current-carrying circuit segment of the current-carrying circuit is wound separately or in parallel.

[0015] Optionally, in the above-mentioned three-phase transformer multi-channel parallel voltage regulation circuit, each current-carrying circuit segment of the current-carrying circuit is composed of a single-strand or multiple-strand conductor.

[0016] Optionally, the above-mentioned three-phase transformer multi-channel parallel voltage regulation circuit includes:

[0017] In the current-carrying loop section, the number of coil turns between any two adjacent taps is the same or different.

[0018] Optionally, in the above-mentioned three-phase transformer multi-channel parallel voltage regulation circuit, the voltage regulating switch includes:

[0019] A voltage regulating switch contact disk, wherein the voltage regulating switch contact disk has N contacts, each contact point correspondingly connected to a contact;

[0020] A connector is used to switch the connection state between the two contacts.

[0021] Optionally, in the above-mentioned three-phase transformer multi-channel parallel voltage regulation circuit, the connector includes:

[0022] Connecting piece and moving rod;

[0023] The moving rod is used to drive the connecting piece to move between the contacts. The length of the connecting piece is equal to the distance between two adjacent contacts. When the connecting piece is in contact with two contacts, the two contacts are electrically connected through the connecting piece.

[0024] Optionally, in the above-mentioned three-phase transformer multi-channel parallel voltage regulation circuit, the connector includes:

[0025] a first electrically conductive connecting rod and a second electrically conductive connecting rod;

[0026] The first ends of the first connecting rod and the second connecting rod are electrically connected;

[0027] The positions of the second ends of the first connecting rod and the second connecting rod are changeable, and the second ends of the first connecting rod and the second connecting rod can be switched between the respective contact points.

[0028] A three-phase transformer comprises any one of the above-mentioned three-phase transformer multi-channel parallel voltage regulating circuits.

[0029] An electrical device comprises the above-mentioned three-phase transformer.

[0030] Based on the above technical solution, the above solution provided by the embodiment of the present invention splits each current-carrying circuit of the three-phase transformer into multiple current-carrying circuit segments, and configures multiple taps for each current-carrying circuit segment. At the same time, a voltage regulating switch is configured for two adjacent current-carrying circuit segments. The connection state of the taps between the two adjacent current-carrying circuit segments can be adjusted by the voltage regulating switch. The connected taps are different, and the number of coil turns in the current-carrying circuit is different, so that the voltage output by the multi-channel parallel voltage regulating circuit of the three-phase transformer is different, thereby realizing that the multi-channel parallel voltage regulating circuit of the three-phase transformer can provide adjustable voltage according to load requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0032] Figure 1 This is a structural diagram of a three-phase transformer multi-channel parallel voltage regulation circuit disclosed in an embodiment of the present application;

[0033] Figure 2 This is a structural diagram of a three-phase transformer multi-channel parallel voltage regulation circuit disclosed in another embodiment of the present application;

[0034] Figure 3 This is a structural diagram of a three-phase transformer multi-channel parallel voltage regulation circuit disclosed in another embodiment of the present application;

[0035] Figure 4 This is a structural diagram of a three-phase transformer multi-channel parallel voltage regulation circuit disclosed in another embodiment of the present application;

[0036] Figure 5 This is a structural diagram of a voltage regulating switch disclosed in an embodiment of the present application;

[0037] Figure 6 This is a structural schematic diagram of a voltage regulating switch disclosed in another embodiment of the present application;

[0038] Figure 7 This is a structural schematic diagram of a voltage regulating switch disclosed in another embodiment of the present application;

[0039] Figure 8 This is a structural schematic diagram of a voltage regulating switch disclosed in another embodiment of the present application;

[0040] Figure 9 This is a structural schematic diagram of a three-phase transformer multi-channel parallel voltage regulation circuit disclosed in another embodiment of the present application. DETAILED DESCRIPTION

[0041] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0042] See also Figure 1 The three-phase transformer multi-channel parallel voltage regulation circuit disclosed in the embodiment of the present application may include:

[0043] The A-phase coil, the B-phase coil and the C-phase coil each include a current-carrying circuit A and a voltage-regulating switch K corresponding to the current-carrying circuit.

[0044] Phase A Coil: A coil winding in a three-phase transformer that is dedicated to handling Phase A current. It is usually wound with multiple turns of wire and mounted on the transformer's core.

[0045] B-phase coil: Similar to the A-phase coil, the B-phase coil is a coil winding specifically used to process the B-phase current. Its structure and winding method are the same as those of the A-phase coil, but the two are electrically independent of each other.

[0046] C-Phase Coil: As the third winding in a three-phase transformer, the C-Phase Coil is responsible for handling the C-Phase current. Similarly, it is wound with multiple turns of wire and mounted on an iron core. Together with the A-Phase and B-Phase Coils, it forms the main electrical portion of the three-phase transformer.

[0047] In a three-phase transformer, the current-carrying circuit is mainly reflected in its windings. The three-phase transformer consists of an iron core (or magnetic core) and a coil. The coil is divided into a primary coil and a secondary coil, and each coil contains multiple windings. When the transformer is working, alternating current will flow into these windings, thereby forming a current-carrying circuit. Therefore, in this solution, the primary winding and the pole winding constituting the A-phase coil, the B-phase coil and the C-phase coil can all serve as the current-carrying circuit of the A-phase coil, the B-phase coil and the C-phase coil. In this solution, for the sake of ease of introduction, the current-carrying circuit can refer to the primary winding or the secondary winding, rather than the current-carrying circuit including both the primary winding and the secondary winding.

[0048] In this solution, the current-carrying loop may include X current-carrying loop segments (e.g. Figure 1 The current-carrying loop segments a1 and a2 in the figure are shown in FIG1 . Each current-carrying loop segment can be considered as a winding segment, that is, the primary winding and / or secondary winding of each phase coil can be composed of X current-carrying loop segments, and each current-carrying loop segment can be provided with N taps (such as Figure 1 Taps 3, 4, and N in the figure are positive integers not less than 2, where X and N are adjustable contact points on the coil. By changing the position of the taps, the output voltage or inductance of the device can be changed to meet different circuit requirements. By selecting the taps connected to the current-carrying loop segment, the number of turns of the coil in the current-carrying loop segment can be selected to achieve the output voltage of the device. For example, Figure 1 As shown, in this solution, the value of X may be 2, that is, the current-carrying loop includes a first current-carrying loop segment a1 and a second current-carrying loop segment a2 (the primary winding and / or the secondary winding may include a first current-carrying loop segment and a second current-carrying loop segment), and the first current-carrying loop segment a1 and the second current-carrying loop segment a2 each include N taps;

[0049] Each current-carrying loop corresponds to X-1 voltage-regulating switches K, and each voltage-regulating switch K corresponds to two physically adjacent current-carrying loop segments. The voltage-regulating switch K is used to switch the connection state between a first target tap and a second target tap. The first target tap is a tap of one of the two adjacent current-carrying loop segments, and the second target tap is a tap of the other current-carrying loop segment. The voltage-regulating switch and the tap are connected by a lead. For example, in this embodiment, a certain voltage regulating switch corresponds to the first current-carrying circuit segment and the second current-carrying circuit segment, and the first current-carrying circuit segment and the second current-carrying circuit segment are two adjacent current-carrying circuit segments. Taps 3, 4, 5, 6, 7, and 8 can be provided on the first current-carrying circuit segment and the second current-carrying circuit segment, wherein the taps on the first current-carrying circuit segment are 3, 4, and 5, and the taps on the second current-carrying circuit segment are 6, 7, and 8. The voltage regulating switch is used to realize the on-off state between tap 3 and taps 6, 7, and 8, tap 5 and taps 6, 7, and 8, and can realize the on / off state between tap 3 and tap 6, 7, or 8, the on / off state between tap 4 and tap 6, 7, or 8, and the on / off state between tap 5 and tap 6, 7, or 8.

[0050] The more current-carrying loop sections there are and the more taps there are on each current-carrying loop section, the more voltage levels the three-phase transformer multi-channel parallel voltage regulation circuit can provide. In this embodiment, the values ​​of X and N can be selected according to user needs. Figure 2 As shown, if the current-carrying circuit corresponding to the primary coil is divided into two current-carrying circuit segments and only one voltage-regulating switch is provided for each phase (these voltage-regulating switches are integrated together), the voltage regulation range of the resulting three-phase transformer multi-channel parallel voltage-regulating circuit is limited. In this embodiment, the value of X can be 2, and the value of N can be 3. That is, in the technical solution disclosed in this embodiment, the above-mentioned current-carrying circuit can refer to the primary coil current-carrying circuit and / or the secondary coil current-carrying circuit of the three-phase transformer. The primary coil current-carrying circuit and / or the secondary coil current-carrying circuit can each include the first current-carrying circuit segment and the second current-carrying circuit segment. Each sub-current-carrying circuit corresponds to a voltage-regulating switch. The first current-carrying circuit segment and the second current-carrying circuit segment are each provided with three taps. The voltage-regulating switch can control the connection state of the taps on the first current-carrying circuit segment and the taps on the second current-carrying circuit segment.

[0051] In the above scheme, the connection state of the tap between two adjacent current-carrying circuit segments can be adjusted by the voltage regulating switch. The connected taps are different, and the number of coil turns in the current-carrying circuit is different, so that the voltage output by the multi-channel parallel voltage regulating circuit of the three-phase transformer is different, thereby realizing that the multi-channel parallel voltage regulating circuit of the three-phase transformer can provide adjustable voltage according to load requirements.

[0052] In this embodiment, Figure 3As shown, if each voltage regulating switch is set independently to adjust the voltage of a single-phase coil, and the three voltage regulating switches synchronously complete the voltage regulation of the entire transformer, the equipment will occupy a large space and the voltage regulation mechanism will be complicated. Since in the multi-way parallel voltage regulation circuit of the three-phase transformer, the A-phase coil, the B-phase coil and the C-phase coil can each correspond to X-1 voltage regulating switches, see Figure 4 Three voltage regulating switches (the xth (x∈[1,2,…,X-1]) voltage regulating switch corresponding to the A phase coil, the xth voltage regulating switch corresponding to the B phase coil, and the xth voltage regulating switch corresponding to the C phase coil) can be grouped together and integrated into a total voltage regulating switch K 总 In this case, the three voltage-regulating switches are adjusted synchronously. By adjusting the master switch, the connection status of the contacts of the current-carrying loop segments in the A-phase, B-phase, and C-phase coils can be synchronously controlled. This integrated approach also reduces circuit size. For example, if the primary coils of the A-phase, B-phase, and C-phase coils include two current-carrying loop segments, then the primary coils of the A-phase, B-phase, and C-phase coils correspond to one master voltage-regulating switch. If there are three current-carrying loop segments (two adjacent to each other), then the primary coils correspond to two master voltage-regulating switches. If the secondary coils of the A-phase, B-phase, and C-phase coils include two current-carrying loop segments, then the secondary coils of the A-phase, B-phase, and C-phase coils correspond to one master voltage-regulating switch. If the secondary coils of the A-phase, B-phase, and C-phase coils include three current-carrying loop segments, then the secondary coils of the A-phase, B-phase, and C-phase coils correspond to two master voltage-regulating switches.

[0053] In this embodiment, the current-carrying loop segments of each current-carrying loop can be wound separately or in parallel. Specifically, the coils in the primary coil current-carrying loop and the secondary coil current-carrying loop can be wound separately or in parallel. Separate winding ensures sufficient insulation distance between the primary and secondary coils, which helps prevent short circuits or electric shock risks caused by insulation damage, thereby improving device safety. This reduces electromagnetic interference between the primary and secondary coils, lowering both common-mode and differential-mode noise, facilitating device electromagnetic compatibility (EMC) design. In certain applications, such as welding machines, taps and position switches on the primary coil can adjust the output current or voltage by adjusting the turns ratio of the primary to secondary coils. This adjustment method is more convenient and precise when winding separately. Parallel winding (such as primary flat winding or secondary flat winding) increases the coupling area between the primary and secondary coils, thereby reducing the leakage inductance of the transformer. Reducing leakage inductance helps alleviate voltage stress issues in the switching transistor and improves the electromagnetic interference (EMI) performance of the transformer. With bifilar winding, the DC resistance and AC impedance of the two windings are more symmetrical, meeting the circuit's phase relationship requirements and ensuring complete balance between the two coils. This balance helps suppress common-mode interference and improves the product's electromagnetic compatibility. Bifilar winding also increases the conductor's surface area, minimizing the skin effect of current flow. This reduced skin effect helps lower conductor resistance and temperature rise, improving equipment efficiency and reliability. The specific winding method can be selected based on design requirements.

[0054] In this embodiment, each current-carrying circuit segment in the current-carrying circuit can be composed of single-strand or multi-strand conductors. That is, the coils in the primary and secondary coil current-carrying circuits can be composed of single-strand or multi-strand conductors. Single-strand conductors, due to their solid structure, offer lower resistance and superior conductivity, helping to reduce energy loss. Single-strand conductors are also known for their higher hardness and greater tensile strength, maintaining stable shape and performance in a variety of environments. The production process for single-strand conductors is relatively simple, resulting in lower costs and suitable for mass production. When coils need repairing or replacement, single-strand conductors, due to their simple structure, are easier to repair and replace. Multi-strand conductors, which can be made from multiple thin copper or other metal wires twisted together, offer excellent flexibility and facilitate bending and securing within complex coil structures. Multi-strand conductors have a larger contact area, facilitating heat dissipation and reducing safety hazards caused by overheating. At high frequencies, multi-strand conductors can more effectively disperse current, reduce the skin effect, and improve current transmission efficiency. In certain specialized applications, such as high-frequency transformers, multi-strand conductors can provide better electrical performance to meet specific needs.

[0055] In this embodiment, the number of coil turns corresponding to each tap can be set according to design requirements. In the same current-carrying loop section, the number of coil turns between any two adjacent taps can be the same or different. However, in order to prevent the generation of circulating currents due to different final output voltages between the three phases, the number of turns of the taps corresponding to each current-carrying loop in the primary winding or secondary winding of the three-phase coil is the same. Preferably, in this solution, the number of coil turns between any two adjacent taps is the same. In this case, by changing the taps, the output voltage of the three-phase transformer can be adjusted proportionally. For example, the number of coil turns between tap n-2 and tap n-1 is Z, and the number of coil turns between tap n-1 and tap n is also Z. The number of coil turns between the corresponding taps of the sub-current-carrying loop sections belonging to the primary winding or secondary winding must be the same. At the same time, the number of coil turns between the corresponding two taps in each current-carrying loop section of the primary coil or secondary coil of the A-phase coil, the B-phase coil, and the C-phase coil are the same.

[0056] This embodiment discloses a mechanism of a voltage regulating switch, which may include N contacts and a connector, each contact corresponding to a tap in a current-carrying circuit segment, and the connector is used to switch the connection state between any two of the contacts. Of course, the two contacts connected by the connector belong to different current-carrying circuit segments (the two current-carrying circuit segments are adjacent), for example, see Figure 5 The first current-carrying loop segment a1 and the second current-carrying loop segment a2 are adjacent. Assuming that the taps on the first current-carrying loop segment a1 are 3, 4, and 5, and the taps on the second current-carrying loop segment a2 are 6, 7, and 8, the voltage-regulating switch can include six contacts, which are denoted as contacts 3, 4, 5, 6, 7, and 8, respectively. These contacts correspond to taps 3, 4, 5, 6, 7, and 8, respectively. When the connector connects contact 3 and contact 8, tap 3 is connected to tap 8. When the connector connects tap 4 and contact 7, tap 4 is connected to tap 7. When the connector connects tap 5 and contact 6, tap 5 is connected to tap 6. At this time, by switching the connection state between the contacts, the number of turns of the coil connected to the current-carrying loop can be switched, thereby adjusting the output voltage of the three-phase transformer. In this embodiment, a total voltage-regulating switch can integrate three connectors, which have the same structure and can operate synchronously.

[0057] Furthermore, the connector may include a connecting piece and a moving rod. The distribution between the contacts in the voltage regulating switch contact disk is as follows: the taps corresponding to two adjacent contacts belong to different current-carrying circuit segments. The moving rod is connected to the connecting piece and can drive the connecting piece to move. The connecting piece is a metal piece and is used to achieve electrical connection between two adjacent contacts. For example, see Figure 3The moving rod can drive the connecting piece to rotate in the same way as the clock hand rotates. When the connecting piece rotates to different positions, the two contacts it connects are different. Of course, in addition to the distribution of the contacts Figure 5 In addition to the circular distribution, it can also be Figure 6 linear distribution.

[0058] In addition, the present application also discloses a connector structure, which consists of two conductive connecting rods, respectively denoted as a first connecting rod g1 and a second connecting rod g2. The first ends of the first connecting rod and the second connecting rod are electrically connected, and the positions of the second ends of the first connecting rod and the second connecting rod are variable. The second ends of the first connecting rod and the second connecting rod can be switched between various contacts. By adjusting the positions of the first connecting rod and the second connecting rod, a point connection state between the two contacts can be achieved. Its structural form can be seen in Figure 7 and Figure 8 . Figure 7 Each connecting rod can rotate freely around its second end. Figure 8 In the example, the two connecting rods rotate synchronously, that is, when one connecting rod moves, the other connecting rod will follow and move with the same amplitude.

[0059] In summary of the above embodiments, this application discloses a specific three-phase transformer multi-way parallel voltage regulation circuit, see Figure 9 , taking phase A as an example:

[0060] The A-phase coil includes a current-carrying loop a1 and a current-carrying loop a2 corresponding to the primary coil (or secondary coil). The current-carrying loop a1 and the current-carrying loop a2 are electrically connected in parallel. The current-carrying loop a1 includes two current-carrying loop segments a11 and a12. The current-carrying loop a2 includes two current-carrying loop segments a21 and a22. The current-carrying loop segment a11 has three taps, which are respectively recorded as A3, A4, and A5. The current-carrying loop segment a12 has three taps, which are respectively recorded as A6, A7, and A8. The current-carrying loop segment a21 has three taps, which are respectively recorded as A3', A4', and A5'. The current-carrying loop segment a22 has three taps, which are respectively recorded as A6', A7', and A8'. The voltage regulating switch corresponding to the current-carrying circuit segments a11 and a12 is KA, and the contacts in KA are 3, 4, 5, 6, 7, and 8. Contact 4 is connected to tap A4, contact 5 is connected to tap A5, contact 6 is connected to tap A6, contact 7 is connected to tap A7, and contact 8 is connected to tap A8. The voltage regulating switch corresponding to the current-carrying circuit segments a21 and a22 is KA', and the contacts in KA' are 3', 4', 5', 6', 7', and 8'. Contact 3' is connected to tap A3', contact 4' is connected to tap A4', contact 5' is connected to tap A5', contact 6' is connected to tap A6', contact 7' is connected to tap A7', and contact 8' is connected to tap A8'. By adjusting the voltage regulating switch to the moving rod in KA, the two contacts connected by the connecting piece are adjusted, thereby adjusting the number of coil turns of the corresponding current-carrying circuit in the coil. By adjusting the voltage regulating switch to the moving rod in KA', the two contacts connected by the connecting piece are adjusted, thereby adjusting the number of coil turns of the corresponding current-carrying circuit in the coil.

[0061] The B-phase coil includes a current-carrying loop b1 and a current-carrying loop b2 corresponding to the primary coil (or secondary coil). The current-carrying loop b1 and the current-carrying loop b2 are electrically connected in parallel. The current-carrying loop b1 includes two current-carrying loop segments b11 and b12. The current-carrying loop b2 includes two current-carrying loop segments b21 and b22. The current-carrying loop segment b11 has three taps, which are respectively recorded as B3, B4, and B5. The current-carrying loop segment b12 has three taps, which are respectively recorded as B6, B7, and B8. The current-carrying loop segment b21 has three taps, which are respectively recorded as B3', B4', and B5'. The current-carrying loop segment b22 has three taps, which are respectively recorded as B6', B7', and B8'. The voltage regulating switch corresponding to the current-carrying circuit segments b11 and b12 is KB, and KB has contacts 3, 4, 5, 6, 7, and 8. Contact 3 is connected to tap B3, contact 4 is connected to tap B4, contact 5 is connected to tap B5, contact 6 is connected to tap B6, contact 7 is connected to tap B7, and contact 8 is connected to tap B8. The voltage regulating switch corresponding to the current-carrying circuit segments b21 and b22 is KB', and KB' has contacts 3', 4', 5', 6', 7', and 8'. Contact 3' is connected to tap B3', contact 4' is connected to tap B4', contact 5' is connected to tap B5', contact 6' is connected to tap B6', contact 7' is connected to tap B7', and contact 8' is connected to tap B8'. By adjusting the voltage regulating switch to the moving rod in KB, the two contacts connected by the connecting piece are adjusted, thereby adjusting the number of coil turns of the corresponding current-carrying circuit in the coil. By adjusting the voltage regulating switch to the moving rod in KB', the two contacts connected by the connecting piece are adjusted, thereby adjusting the number of coil turns of the corresponding current-carrying circuit in the coil.

[0062] The C-phase coil includes a current-carrying loop c1 and a corresponding current-carrying loop c2 corresponding to the primary coil (or secondary coil). The current-carrying loop c1 and the current-carrying loop c2 are electrically connected in parallel. The current-carrying loop c1 includes two current-carrying loop segments c11 and c12. The current-carrying loop c2 includes two current-carrying loop segments c21 and c22. The current-carrying loop segment c11 has three taps, which are respectively recorded as C3, C4, and C5. The current-carrying loop segment c12 has three taps, which are respectively recorded as C6, C7, and C8. The current-carrying loop segment c21 has three taps, which are respectively recorded as C3', C4', and C5'. The current-carrying loop segment c22 has three taps, which are respectively recorded as C6', C7', and C8'. The voltage regulating switch corresponding to the current-carrying circuit segments c11 and c12 is KC, and KC has contacts 3, 4, 5, 6, 7, and 8. Contact 3 is connected to tap C3, contact 4 is connected to tap C4, contact 5 is connected to tap C5, contact 6 is connected to tap C6, contact 7 is connected to tap C7, and contact 8 is connected to tap C8. The voltage regulating switch corresponding to the current-carrying circuit segments c21 and c22 is KC', and KC' has contacts 3', 4', 5', 6', 7', and 8'. Contact 3' is connected to tap C3', contact 4' is connected to tap C4', contact 5' is connected to tap C5', contact 6' is connected to tap C6', contact 7' is connected to tap C7', and contact 8' is connected to tap C8'. By adjusting the voltage regulating switch to the moving rod in KC, the two contacts connected by the connecting piece are adjusted, thereby adjusting the number of coil turns of the corresponding current-carrying circuit in the coil. By adjusting the voltage regulating switch to the moving rod in KC', the two contacts connected by the connecting piece are adjusted, thereby adjusting the number of coil turns of the corresponding current-carrying circuit in the coil.

[0063] Corresponding to the above-mentioned voltage regulating circuit, the present application also discloses a three-phase transformer, including any one of the above-mentioned three-phase transformer multi-channel parallel voltage regulating circuits.

[0064] Corresponding to the above-mentioned voltage regulating circuit, the present application also discloses an electrical device, including any one of the three-phase transformers described above.

[0065] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. Reference can be made to the common and similar parts between the various embodiments. For the devices disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple, and the relevant parts can be referred to the method description.

[0066] The above description of the disclosed embodiments will enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A three-phase transformer multi-channel parallel voltage regulation circuit, characterized in that: include: A phase coil, a B phase coil and a C phase coil, each phase coil includes a current-carrying circuit; The current-carrying loop includes X current-carrying loop segments, each current-carrying loop segment includes N taps, and X and N are positive integers not less than 2; X-1 voltage-regulating switches, each voltage-regulating switch corresponds to two adjacent current-carrying loop segments, and the voltage-regulating switch is used to switch the connection state between a first target tap and a second target tap, the first target tap being a tap of one of the two adjacent current-carrying loop segments, and the second target tap being a tap of the other current-carrying loop segment.

2. The three-phase transformer multi-channel parallel voltage regulation circuit according to claim 1, characterized in that: The value of X is 2; The current-carrying loop includes a first current-carrying loop section and a second current-carrying loop section; The voltage regulating switch is used to switch the connection state between a first target tap and a second target tap, the first target tap is a tap in the first current-carrying loop segment, and the second target tap is a tap in the second current-carrying loop segment.

3. The three-phase transformer multi-channel parallel voltage regulation circuit according to claim 2, characterized in that: The current-carrying circuit includes: a primary coil current-carrying circuit and a secondary coil current-carrying circuit. At least one of the primary coil current-carrying circuit or the secondary coil current-carrying circuit includes the first current-carrying circuit segment and the second current-carrying circuit segment. Each sub-current-carrying circuit corresponds to a voltage regulating switch.

4. The three-phase transformer multi-channel parallel voltage regulation circuit according to claim 1, characterized in that: The current-carrying loop sections of the current-carrying loop are wound separately or in parallel.

5. The three-phase transformer multi-channel parallel voltage regulation circuit according to claim 1, characterized in that: Each current-carrying loop segment of the current-carrying loop is composed of a single-strand or multi-strand wire.

6. The three-phase transformer multi-channel parallel voltage regulation circuit according to claim 3, characterized in that: include: In the current-carrying loop section, the number of coil turns between any two adjacent taps is the same or different.

7. The three-phase transformer multi-channel parallel voltage regulation circuit according to claim 2, characterized in that: The voltage regulating switch comprises: A voltage regulating switch contact disk, wherein the voltage regulating switch contact disk has N contacts, each contact point correspondingly connected to a contact; A connector is used to switch the connection state between the two contacts.

8. The three-phase transformer multi-channel parallel voltage regulation circuit according to claim 7, characterized in that: The connector includes: Connecting piece and moving rod; The moving rod is used to drive the connecting piece to move between the contacts. The length of the connecting piece is equal to the distance between two adjacent contacts. When the connecting piece contacts two contacts, the two contacts are electrically connected through the connecting piece.

9. The three-phase transformer multi-channel parallel voltage regulation circuit according to claim 7, characterized in that: The connector includes: a first electrically conductive connecting rod and a second electrically conductive connecting rod; The first ends of the first connecting rod and the second connecting rod are electrically connected; The positions of the second ends of the first connecting rod and the second connecting rod are changeable, and the second ends of the first connecting rod and the second connecting rod can be switched between the respective contact points.

10. A three-phase transformer, characterized in that: The invention comprises the three-phase transformer multi-channel parallel voltage regulating circuit according to any one of claims 1 to 9.

11. An electrical device, characterized in that: Including the three-phase transformer according to claim 10.

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