Production process of an intelligent on-load voltage regulating three-dimensional wound core transformer

Abstract

The present invention relates to the technical field of transformers, and specifically to a production process of an intelligent on-load voltage regulating three-dimensional wound core transformer. The transformer includes an oil tank, a three-dimensional wound core, a high-voltage coil, a low-voltage coil, and an intelligent on-load voltage regulating switch. The three-dimensional wound core, the high-voltage coil, and the low-voltage coil are all arranged in the oil tank. The production process is as follows: Prepare the three-dimensional wound core. The three-dimensional wound core is composed of 3 identical core frames. Each single core frame is stacked by multi-stage and multi-layer amorphous alloy strips. The core column and the lower yoke of the core frame are of a closed structure, and the upper yoke is of an open structure. Through the setting of the open structure of the three-dimensional wound core, there is no need for special equipment such as a three-dimensional wound core winding machine, an argon arc welding machine, a gear mold, and a winding skeleton insulating cylinder in the production process.

Description

Technical Field

[0001] The present invention relates to the technical field of transformers, and specifically to a production process of an intelligent on-load tap-changing three-dimensional wound core transformer. Background Art

[0002] With the increasingly low energy consumption requirements of the power grid for power transmission and transformation equipment, the national mandatory standard GB 20052-2024 "Minimum Allowable Values of Energy Efficiency and Energy Efficiency Grades for Power Transformers" will be implemented on February 1, 2025. Due to the material characteristics of the core and the overall structural advantages, when users adopt a transformer with an amorphous alloy three-dimensional wound core, the energy consumption value will reach the lowest and the volume will be the smallest. However, due to the characteristics of the amorphous alloy core strip being thin, brittle, and hard, if the production process is not good, there will be a risk of high losses and high noise in batches of transformers. Traditional three-dimensional wound cores generally adopt a closed structure, with a complex production process, requiring special three-dimensional wound core winding machines, argon arc welders, gear molds, etc. A customized insulating cylinder is required as a winding skeleton inside each coil. The low-voltage leads need to be led out using very short soft copper strips and embedded in the slots of the gear mold. Moreover, the slot positions of the three-phase leads are all different, and a certain operating space needs to be reserved between the insulating cylinder skeleton and the gear mold and the core. If this spacing is too small or the operation is improper, there will be a risk of the core generating fragments, increased losses, and increased noise. Also, due to the non-load-bearing characteristic of this core, the short-circuit resistance of the transformer coil is relatively poor. The entire production and manufacturing cycle of the transformer is long and the cost is high. Summary of the Invention

[0003] The purpose of the present invention is to provide a production process of an intelligent on-load tap-changing three-dimensional wound core transformer to solve the problems raised in the above background art.

[0004] To achieve the above purpose, the present invention provides the following technical solution: A production process of an intelligent on-load tap-changing three-dimensional wound core transformer, the transformer includes an oil tank, a three-dimensional wound core, a high-voltage coil, a low-voltage coil, and an intelligent on-load tap-changing switch. The three-dimensional wound core, high-voltage coil, and low-voltage coil are all arranged in the oil tank. The production process is as follows:

[0005] S1, prepare the three-dimensional wound core. The three-dimensional wound core is composed of 3 identical core frames. Each single core frame is stacked by multi-stage and multi-layer amorphous alloy strips. The core column and the lower yoke of the core frame are of a closed structure, and the upper yoke is of an open structure;

[0006] S2. The cross-section of the iron core frame is composed of multiple layers of amorphous alloy strips stacked in a parallelogram shape. On the operating table, splice the amorphous alloy strips into a multi-layer parallelogram. The upper yoke has multiple joints, and it is required that the joints are tightly overlapped. After the single iron core frame is stacked and shaped, remove the excess corner materials beyond the circumcircle of the core column. Fill the gaps between the core column and the lower yoke with insulating rods, brush a layer of resin, and after the resin cures, semi-wrap the outside with a layer of fiber tape, and then evenly apply a layer of glass glue on the outside of the iron core;

[0007] S3. Wind the high-voltage coil and the low-voltage coil together as a whole. First, use the foil winding process to wind the low-voltage coil on a circular winding mold. All the oil ducts inside the low-voltage coil are divided into two parts. The outer side is the low-voltage long oil duct, and the inner side is the low-voltage short oil duct. No oil ducts are placed at the 60° phase-interval angles on both sides of the inner side. After the low-voltage coil is wound, place the main insulation oil duct between the high-voltage coil and the low-voltage coil. All the oil ducts inside the high-voltage coil are also divided into two parts. The outer side is the high-voltage long oil duct, and the inner side is the high-voltage short oil duct. No oil ducts are placed at the 60° phase-interval angles on both sides of the inner side;

[0008] S4. The high-voltage coil is of the multi-layer cylindrical type and is provided with interlayer insulation. The interlayer insulation uses DDP full-glue insulating paper. The starting end of the coil is A(B,C). After multi-layer winding, complete the e, c, a tapping leads in the second outermost layer in sequence. Then disconnect the a and b tapping leads during the winding process, and start winding the outermost layer of the coil from the other end of the coil axis. First, add a filling end ring at the starting end of the outermost layer. The width of the filling end ring is equal to the size of the non-full-turn distribution of the outermost layer plus the size of the end insulation. Then complete the b, d, f tapping leads and the X(Y,Z) end drop in the outermost layer in sequence. The tapping leads of the second outermost layer and the outermost layer are symmetrically arranged along the coil axis, and all the tapping leads are led to the upper end through axial leads;

[0009] S5. For transformer assembly, first place the three-phase coils on the horizontal ground in phase sequence, fix the phase spacers, and tie them tightly inside and outside with PET packing straps. Then rotate the three-phase coils 90° on the flipping table and place them on the operating table as a whole. Open the upper yoke of the iron core and tie the yoke sheath. The sheath is made of a rolled stainless steel plate, and the whole is in the shape of a half-cone, with a semi-circular cross-section. The inner diameter of the large head of the cone is equal to the outer diameter of the core column. The large head end of the sheath is tied and fixed to the core column, and the other end is tied to the upper yoke, requiring no burrs at the corners and a circular arc shape around;

[0010] Then insert the single iron core frame into the coil interior in sequence, fix the upper yoke connection head, and then place the whole on the flipping table and rotate it counterclockwise by 90°. Place all the connection heads at the lower part of the transformer body and hoist it to the next assembly process;

[0011] S6. Carry out the general assembly, including lead connection, transformer oil filling, installation of accessory components, and finally conduct electrical performance test and detection to complete the production.

[0012] The intelligent on-load tap-changer includes a switch module and a controller module. The switch module is installed inside the oil tank, and the controller module is installed outside the oil tank.

[0013] The switch module is correspondingly connected to the tap of the high-voltage side of the transformer. By switching the tap through the switch module, the output voltage of the transformer can be adjusted.

[0014] The controller module includes a voltage sampling sensor, a calculation and processing chip, a communication module, a charge and discharge management circuit, and a reserve battery;

[0015] The voltage sampling sensor and the charge and discharge management circuit are both arranged in parallel on the low-voltage connection busbar of the transformer through leads. The output voltage of the low-voltage end of the transformer is monitored by the voltage sampling sensor. The charge and discharge management circuit obtains electric energy through the low-voltage connection busbar of the transformer and charges the reserve battery, so that the power in the reserve battery is always maintained within a certain range. The reserve battery is used to supply power to the calculation and processing chip, the communication module, and the switch module, so that after the low-voltage connection busbar of the transformer is powered off, the calculation and processing chip, the communication module, and the switch module can all operate for a certain period of time.

[0016] An emergency processing program is set in the calculation and processing chip;

[0017] When the voltage sampling sensor detects that the voltage of the low-voltage connection busbar of the transformer disappears, a feedback signal is sent to the emergency processing program in the calculation and processing chip. The emergency processing program controls the operation of the switch module, and the tap is switched step by step in the negative direction through the switch module, so that the number of turns of the high-voltage side coil decreases step by step, thereby trying to bypass the open circuit point of the high-voltage coil. When the voltage sampling sensor detects that the voltage is generated on the low-voltage connection busbar of the transformer, the switching of the tap is stopped.

[0018] Compared with the prior art, the beneficial effects of the present invention are:

[0019] 1. Through the opening structure setting of the three-dimensional wound core, there is no need for special equipment such as a three-dimensional wound core winding machine, an argon arc welder, a gear mold, and a winding skeleton insulating cylinder in the production process.

[0020] 2. The core is simple to manufacture. The specifications and models of the amorphous alloy strips are few and can be combined arbitrarily. There is no need for a core mold, and the coil can be easily sleeved. No fragments are generated during the process. The overall structure is compact. The core is made of amorphous alloy material, which can reduce the no-load loss of the transformer to below the first-level energy efficiency. Moreover, the entire production process of the transformer is simple, and the production and manufacturing cycle of the transformer can be greatly reduced.

[0021] 3. The iron core adopts excellent shock absorption measures. The joints of the upper yoke are tightly overlapped and not affected by external forces. The transformer has low noise. No matter which high-voltage tap position the user uses, the ampere-turn unbalance rate can be minimized to the greatest extent. It has strong short-circuit resistance. While reducing the distance between the iron cores, it can also ensure the safety and reliability of the main insulation. Brief Description of the Drawings

[0022] Figure 1 This is the three-dimensional general drawing of the transformer of the present invention.

[0023] Figure 2 This is the front view of the transformer of the present invention.

[0024] Figure 3 This is the structural schematic diagram of the iron core frame of the present invention.

[0025] Figure 4 This is the cross-sectional schematic diagram of the iron core frame of the present invention.

[0026] Figure 5 This is the cross-sectional layout diagram of the oil ducts of the high- and low-voltage coils of the present invention.

[0027] Figure 6 This is the winding drawing of the high-voltage coil of the present invention.

[0028] Figure 7 This is the cross-sectional drawing of the assembled transformer of the present invention.

[0029] Figure 8 This is the schematic diagram of the intelligent on-load tap-changer module of the present invention.

[0030] In the figure: 1. Oil tank; 2. Intelligent on-load tap-changer; 101. Tank cover; 102. High-voltage bushing; 103. Low-voltage bushing; 3. Iron core frame; 4. Amorphous alloy strip; 5. Corner material; 6. Insulating rod; 7. Glass glue; 8. Main insulation oil duct; 9. Low-voltage long oil duct; 10. High-voltage long oil duct; 11. Low-voltage short oil duct; 12. High-voltage short oil duct; 13. High-voltage electromagnetic wire; 14. Interlayer insulation; 15. Filling end ring; 16. Tap; 17. PET packing belt; 18. Phase spacer. Detailed Embodiments

[0031] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0032] Please refer to Figures 1 to 8, the present invention provides a technical solution: a production process of an intelligent on-load tap-changing three-dimensional wound core transformer. The transformer includes an oil tank 1, a three-dimensional wound core, a high-voltage coil, a low-voltage coil, and an intelligent on-load tap-changing switch 2. The three-dimensional wound core, the high-voltage coil, and the low-voltage coil are all arranged in the oil tank 1. Above the oil tank 1, there is a tank cover 101 for sealing the oil tank 1. On the tank cover 101, a high-voltage bushing 102 and a low-voltage bushing 103 are installed, as shown in Figure 1 and Figure 2 shown in the figure.

[0033] The production process of the intelligent on-load tap-changing three-dimensional wound core transformer is as follows:

[0034] S1. Prepare the three-dimensional wound core. The three-dimensional wound core is composed of 3 identical core frames 3. Each single core frame 3 is stacked by multi-stage and multi-layer amorphous alloy strips 4. The core column and the lower yoke of the core frame 3 are of a closed structure, and the upper yoke is of an open structure, specifically as shown in Figure 3 the figure.

[0035] S2. Refer to Figure 4 , the cross-section of the core frame 3 is multi-stage amorphous alloy strips 4 stacked in a parallelogram. On the operating table, splice the amorphous alloy strips 4 into a multi-layer parallelogram. The upper yoke has multi-stage joints, and it is required that the joints overlap tightly. After the single core frame 3 is stacked and shaped, remove the excess corner material 5 beyond the circumcircle of the core column. Fill the gaps between the core column and the lower yoke with insulating rods 6, brush a layer of resin, and after the resin cures, semi-overlap and wrap a layer of fiber tape on the outside, and then evenly apply a layer of glass glue 7 on the outside of the core;

[0036] S3. Wind the high-voltage coil and the low-voltage coil integrally. First, use the foil winding process to wind the low-voltage coil on a circular winding mold, as shown in Figure 5 the figure. All the oil ducts inside the low-voltage coil are divided into 2 parts. The outer side is the low-voltage long oil duct 9, and the inner side is the low-voltage short oil duct 11. No oil ducts are placed at the 60° phase angle between the two inner sides. After the low-voltage coil is wound, place the main insulation oil duct 8 between the high-voltage coil and the low-voltage coil. All the oil ducts inside the high-voltage coil are also divided into 2 parts. The outer side is the high-voltage long oil duct 10, and the inner side is the high-voltage short oil duct 12. No oil ducts are placed at the 60° phase angle between the two inner sides;

[0037] S4. As shown in Figure 6As shown in the figure, the high-voltage coil is of multi-layer cylindrical type, composed of high-voltage electromagnetic wire 13, with interlayer insulation 14 provided. The interlayer insulation 14 uses DDP full-glue insulating paper. The starting end of the coil is A (B, C). After multi-layer winding, the e, c, and a tapping leads are completed in sequence on the second outermost layer. Then, the a and b tapping leads are disconnected during the winding process, and the winding of the outermost layer coil starts from the other end of the coil axis. First, a filling end ring 15 is padded at the starting end of the outermost layer. The width of the filling end ring 15 is equal to the size of the non-full-turn distribution of the outermost layer plus the size of the end insulation. Then, the b, d, f tapping leads and the X (Y, Z) end drop are completed in sequence on the outermost layer. The tapping leads of the second outermost layer and the outermost layer are symmetrically arranged along the coil axis. All tapping leads are led to the upper end through axial leads;

[0038] S5, as Figure 7 As shown in the figure, for the transformer assembly, first place the three-phase coils on the horizontal ground in phase sequence, fix the phase spacers 18, and tie them tightly with PET packing belts 17 inside and outside. Then, rotate the three-phase coils 90° on the turning table and place them on the operating table as a whole. Open the upper yoke of the iron core and tie the yoke sheath. The sheath is made of rolled stainless steel plate, and is in the shape of a half-cone as a whole, with a semi-circular cross-section. The inner diameter of the large end of the cone is equal to the outer diameter of the core column. The large end of the sheath is tied and fixed to the core column, and the other end is tied to the upper yoke, requiring no burrs at the corners and being arc-shaped all around;

[0039] Then, insert the single iron core frame 3 into the coil interior in sequence, fix the upper yoke connection joint, and then place the whole on the turning table and rotate it counterclockwise by 90°. Place all the connection joints at the lower part of the transformer body and hoist it to the next assembly process;

[0040] S6, for the general assembly, including lead connection, transformer oil filling, and installation of accessory components. Finally, conduct electrical performance test and detection. When connecting the leads, connect the lead-out wires of the windings to the terminal blocks of the transformer. The connection should be firm and have good contact to ensure the smooth transmission of current. At the same time, the leads should be insulated to prevent electric leakage accidents. Inject the processed transformer oil into the transformer oil tank. The oil injection process should be carried out slowly to prevent the oil flow from impacting the windings and the iron core. Install other accessory components on the transformer, such as the oil conservator, radiator, gas relay, etc. Conduct various electrical performance tests on the transformer, such as measuring the DC resistance of the windings, measuring the insulation resistance, measuring the dielectric loss factor, power frequency withstand voltage test, induction withstand voltage test, etc. Through these tests, it can be detected whether there are defects such as short circuits and open circuits in the windings of the transformer, and whether the insulation performance is good. Here, the general assembly process is the same as that in the prior art and will not be elaborated in detail.

[0041] When a transformer is in actual use, since the high-voltage side coil has a thinner diameter and more turns compared to the low-voltage side coil, the probability of open-circuit failure is higher under factors such as thermal expansion and contraction, and vibration. When the high-voltage coil of the transformer is open-circuited, the open circuit on the high-voltage side causes the primary current to interrupt, the core magnetic flux to disappear, and the low-voltage side is unable to induce a voltage. At this time, the low-voltage output side of the transformer will be completely powered off. The on-load tap-changer in the traditional technology realizes voltage monitoring and regulation of the transformer by connecting to the low-voltage busbar, and at the same time uses the low-voltage busbar to supply power to the on-load tap-changer itself. When the above-mentioned open-circuit fault of the high-voltage side coil occurs and the low-voltage output side of the transformer is completely powered off, the on-load tap-changer in the traditional technology will be completely powered off and stop operating, and does not have the function of trying to bypass the open-circuit point of the high-voltage coil to restore power supply emergently.

[0042] The intelligent on-load tap-changer 2 provided in the present invention has the above functions. It includes a switch module and a controller module. The switch module is installed inside the oil tank 1, and the controller module is installed outside the oil tank 1. The switch module is correspondingly connected to the tap 16 on the high-voltage side of the transformer. By switching the tap 16 through the switch module, the output voltage of the transformer can be adjusted. The controller module includes a voltage sampling sensor, a calculation and processing chip, a communication module, a charge and discharge management circuit, and a reserve battery;

[0043] The voltage sampling sensor and the charge and discharge management circuit are both connected in parallel to the low-voltage busbar of the transformer through leads; the output voltage of the low-voltage end of the transformer is monitored through the voltage sampling sensor; the charge and discharge management circuit obtains electrical energy through the low-voltage busbar of the transformer and charges the reserve battery, so that the power in the reserve battery always remains within a certain range; the reserve battery is used to supply power to the calculation and processing chip, the communication module, and the switch module, so that after the low-voltage busbar of the transformer is powered off, the calculation and processing chip, the communication module, and the switch module can all maintain operation for a certain period of time.

[0044] The communication module can be WIFI communication or Internet of Things remote communication technology. Through the communication module, the intelligent on-load tap-changer 2 can be set, or the intelligent on-load tap-changer 2 can send a fault alarm through the communication module.

[0045] An emergency processing program is set in the calculation and processing chip; the calculation and processing chip can be a single-chip microcomputer chip or other microprocessor devices, and the functions are realized through programming settings.

[0046] When the voltage sampling sensor detects the disappearance of the voltage at the low-voltage connection terminal of the transformer, it feeds back a signal to the emergency processing program in the calculation and processing chip. The emergency processing program controls the operation of the switch module, and through the switch module, the tap 16 is switched step by step in the negative direction to adjust, so that the number of turns of the high-voltage side coil decreases step by step, thus attempting to bypass the open circuit point of the high-voltage coil; when the voltage sampling sensor detects the generation of voltage at the low-voltage connection terminal of the transformer, the switching of the tap 16 is stopped. The above principle is: assume that the tap distribution of the high-voltage coil is the main tap, -5% tap, -10% tap, -15% tap... When the open circuit point of the high-voltage side coil is between the main tap and the -5% tap, by switching the tap 16 step by step in the negative direction and switching to the -10% tap, the current path becomes: winding head → -10% tap → winding end to form a connection loop, thus skipping the open circuit point, so that when a high-voltage coil open circuit fault occurs, there is a certain probability to restore emergency power supply. After the above negative reduction adjustment of the tap, the voltage at the low-voltage output side of the transformer will increase. Therefore, it is necessary to preset a safety range for restricting the step-by-step switching adjustment of the tap 16 in the negative direction, so that the voltage at the low-voltage output side of the transformer can ensure the safety of downstream equipment after increasing.

[0047] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A production process of an intelligent on-load voltage regulating three-dimensional wound core transformer, characterized in that, The transformer includes an oil tank, a three-dimensional wound core, a high-voltage coil, a low-voltage coil, and an intelligent on-load tap-changer. The three-dimensional wound core, high-voltage coil, and low-voltage coil are all arranged in the oil tank. Its production process is as follows: S1. Prepare the three-dimensional wound core. The three-dimensional wound core is composed of 3 identical core frames. Each single core frame is stacked by multi-stage and multi-layer amorphous alloy strips. The core column and the lower yoke of the core frame are of closed structure, and the upper yoke is of open structure; S2. The cross-section of the core frame is multi-stage amorphous alloy strips stacked in a parallelogram. On the operating table, splice the amorphous alloy strips into a multi-layer parallelogram. The upper yoke has multi-stage joints, and it is required that the joints are closely overlapped. After the single core frame is stacked and shaped, remove the excess corner materials beyond the circumcircle of the core column. Fill the gaps between the core column and the lower yoke with insulating rods, brush a layer of resin, and after the resin cures, semi-overlap and wrap a layer of fiber tape on the outside, and then evenly apply a layer of glass glue on the outside of the core; S3. Wind the high-voltage coil and the low-voltage coil together as a whole. First, use the foil winding process to wind the low-voltage coil on a circular winding mold. All the oil ducts inside the low-voltage coil are divided into 2 parts. The outer side is the low-voltage long oil duct, and the inner side is the low-voltage short oil duct. No oil ducts are placed at the 60° phase-interval angles on both sides of the inner side; after the low-voltage coil is wound, place the main insulation oil duct between the high-voltage coil and the low-voltage coil. All the oil ducts inside the high-voltage coil are also divided into 2 parts. The outer side is the high-voltage long oil duct, and the inner side is the high-voltage short oil duct. No oil ducts are placed at the 60° phase-interval angles on both sides of the inner side; S4. The high-voltage coil is of multi-layer cylindrical type and is provided with interlayer insulation. The interlayer insulation uses DDP full-glue insulating paper. The starting end of the coil is A(B,C). After multi-layer winding, the e, c, and a tapping leads are sequentially completed on the second outermost layer. Then, disconnect the a and b tapping leads during the winding process, and start the winding of the outermost layer coil from the other end of the coil axis. First, add a filling end ring at the starting end of the outermost layer. The width of the filling end ring is equal to the size of the non-full-turn distribution of the outermost layer plus the size of the end insulation. Then, sequentially complete the b, d, f tapping leads and the X(Y,Z) drop head on the outermost layer; the tapping leads on the second outermost layer and the outermost layer are symmetrically arranged in the coil axis direction, and all the tapping leads are led to the upper end through axial leads; S5. Perform transformer assembly. First, place the three-phase coils on the horizontal ground in phase sequence, fix the phase spacers, and tie them tightly inside and outside with PET packing belts. Then, place the three-phase coils on the turning table and rotate them 90°. Place the whole on the operating table, open the upper yoke of the core, and tie the yoke sheath. The sheath is rolled from a stainless steel plate and is in the shape of a half-cone as a whole, with a semi-circular cross-section. The inner diameter of the large head of the cone is equal to the outer diameter of the core column. The large head end of the sheath is tied and fixed to the core column, and the other end is tied to the upper yoke, requiring no burrs at the corners and an arc shape all around; Then, sequentially insert the single core frames into the coil interior, fix the upper yoke connection joints, and then place the whole on the turning table and rotate it counterclockwise by 90°. Place all the connection joints at the lower part of the transformer body and hoist it to the next assembly process; S6. Perform overall assembly, including lead connection, transformer oil filling, and installation of accessory components. Finally, conduct electrical performance test and detection to complete the production; The intelligent on-load tap-changer includes a switch module and a controller module; the controller module includes a voltage sampling sensor, a calculation and processing chip, a communication module, a charge and discharge management circuit, and a reserve battery; an emergency processing program is set in the calculation and processing chip; When the voltage sampling sensor detects the disappearance of the voltage at the low-voltage terminal block of the transformer, it feeds back a signal to the emergency processing program in the calculation and processing chip. The emergency processing program controls the operation of the switch module, and the switch module makes a step-by-step switching adjustment of the tap changer in the negative direction, so that the number of turns of the high-voltage side coil decreases step by step, thereby attempting to bypass the open-circuit point of the high-voltage coil. When the voltage sampling sensor detects the generation of voltage at the low-voltage terminal block of the transformer, the switching of the tap changer is stopped; the switch module is installed inside the oil tank, and the controller module is installed outside the oil tank; the voltage sampling sensor and the charge and discharge management circuit are both connected in parallel to the low-voltage terminal block of the transformer through leads; the voltage sampling sensor monitors the output voltage at the low-voltage end of the transformer; the charge and discharge management circuit obtains electric energy through the low-voltage terminal block of the transformer and charges the reserve battery, so that the power in the reserve battery is always maintained within a certain range; the reserve battery is used to supply power to the calculation and processing chip, the communication module, and the switch module, so that after the power supply of the low-voltage terminal block of the transformer is cut off, the calculation and processing chip, the communication module, and the switch module can all maintain operation for a certain period of time.

2. The production process of an intelligent on-load voltage regulating three-dimensional wound core transformer according to claim 1, characterized in that: The switch module is correspondingly connected to the tap changer on the high-voltage side of the transformer, and the output voltage of the transformer is adjusted by switching the tap changer through the switch module.

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