High-voltage coil anti-short-circuit optimization structure based on multi-wire parallel winding
By using a high-voltage coil structure with multiple wires wound in parallel and taps optimized, the problem of ampere-turn imbalance in high-voltage coils under different tap positions is solved, improving short-circuit withstand capability and reducing cost.
Patent Information
- Application Number
- CN202520311487.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-25
- Publication Date
- 2026-01-23
- Estimated Expiration
- 2035-02-25
AI Technical Summary
Traditional high-voltage coils exhibit ampere-turn imbalance at different tap positions, leading to electromagnetic force imbalance, reduced short-circuit withstand capability, and complex and costly voltage regulation structures.
The high-voltage coil structure with multiple conductors wound in parallel is adopted. Through alternating winding and tap optimization, the ampere-turn balance under all tap positions is ensured, and cable paper is wrapped around the conductors to enhance insulation.
It achieves ampere-turn balance under all tap positions, improves short-circuit withstand capability, reduces the risk of coil deformation, and simplifies the structure and reduces costs.
Smart Images
Figure CN223828327U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of transformer high-voltage coil technology, specifically relating to an optimized structure for short-circuit protection of high-voltage coils based on multi-wire parallel winding. Background Technology
[0002] The high-voltage coil of a transformer is subjected to enormous electromagnetic forces during a short circuit. If the ampere-turns (current multiplied by the number of turns) distribution is unbalanced, it can lead to coil deformation or even damage. Traditional methods improve short-circuit withstand capability by increasing the coil yield coefficient, the number of pads, or designing a dedicated voltage regulating coil, but these methods suffer from problems such as unbalanced tap regulation and poor economic efficiency. Specifically, when the high-voltage coil tap regulation range is ±5%, the ampere-turn balance is only good at the maximum tap position; other tap positions (especially the minimum tap) show an imbalance, significantly reducing short-circuit withstand capability. Ampere-turn balance requires that the product of current and number of turns in both the high-voltage and low-voltage coils be equal to avoid electromagnetic force imbalance. Tap regulation involves changing the transformer turns ratio by switching coil taps to achieve voltage regulation. Designing a separate voltage regulating coil is costly and structurally complex.
[0003] Therefore, there is an urgent need for a structural solution that can maintain ampere-turn balance across the entire tap range. Utility Model Content
[0004] To address the problems in the prior art, this application proposes an optimized short-circuit protection structure for high-voltage coils based on multi-wire parallel winding, which solves the problem of electromagnetic force imbalance caused by the mismatch in the number of turns of the high-voltage coil under different tap positions, and improves the short-circuit protection capability of all tap positions.
[0005] This utility model proposes a high-voltage coil anti-short-circuit optimization structure based on multi-wire parallel winding, including a sixth tap, a starting section coil 10-6' and 4 wires; the 4 wires are wire 6-4', wire 4-2, wire 3-5' and wire 5-7;
[0006] The first two sections of the coil of the sixth tap include the starting section coil 10-6'. The four wires are wound together with the starting section coil 10-6' as the starting end to form multiple original taps including tap 6', tap 6, tap 4', tap 4, tap 2 lead, tap 3 lead, tap 5', tap 5, and tap 7 lead. Tap 6 and tap 6' are welded to form a new tap 6 lead. Tap 4 and tap 4' are welded to form a new tap 4 lead. Tap 5 and tap 5' are welded to form a new tap 5 lead.
[0007] Furthermore, the high-voltage coil short-circuit protection optimization structure also includes a maximum tap and a minimum tap; the maximum tap is the connection between tap 2 and tap 3; the minimum tap is the connection between tap 6 and tap 7.
[0008] Furthermore, the high-voltage coil has an alternating forward and reverse winding structure.
[0009] Furthermore, each of the aforementioned wires is covered with cable paper.
[0010] Furthermore, the way the wire is covered with cable paper is by half-layer or 1 / 3-layer overlap.
[0011] Furthermore, the thickness of the cable paper is 0.13 mm.
[0012] The beneficial effects of this utility model are:
[0013] Full tap ampere-turn balance: Through multi-wire parallel winding and tap optimization, the ampere-turns of high and low voltage coils can be well coupled in all tap positions.
[0014] Improved short-circuit withstand capability: Eliminates ampere-turn voids, reduces electromagnetic force imbalance, and lowers the risk of coil deformation.
[0015] High cost-effectiveness: No additional voltage regulating coil is required, simplifying the structure and reducing costs. Attached Figure Description
[0016] Figure 1 This is a schematic diagram of the high-voltage coil tap structure of this utility model.
[0017] Figure 2 This is a schematic diagram showing the connection principle of each tap in this utility model. Detailed Implementation
[0018] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.
[0019] like Figure 1 As shown, the first two sections of the sixth tap (or tap 6) are wound with four wires, and the winding direction alternates between the forward and reverse sections.
[0020] like Figure 2 The diagram shows the tap connection logic. For example, when the largest tap is connected (tap 2 and tap 3 are connected), the current path is A-10-6'-6-....-7, achieving full-turn coupling; when the smallest tap is connected (tap 6 and tap 7 are connected), the first 10-6' turns of the coil are retained to avoid ampere-turn voids.
[0021] The optimized structure for short-circuit protection of high-voltage coils based on multi-wire parallel winding in this embodiment mainly includes coil winding and tap welding.
[0022] Coil winding:
[0023] The first two sections of the coil of the sixth tap serve as the starting end, with the number of turns in each section matching the tap position. For example, for a ±5% tap, each section corresponds to 5% of the turns. Four wires are wound in parallel, with the number of turns in each wire equal to that of a tap position, and covered with 0.13mm cable paper (half a stack or 1 / 3 stack). That is, the starting section coil 10-6' is wound in parallel with wires 6-4', 4-2, 3-5', and 5-7, forming multiple initial taps including tap 6', tap 6, tap 4', tap 4, tap 2, tap 3, tap 5', tap 5, and tap 7.
[0024] Tap welding:
[0025] Weld tap 6 to tap 6' to form a new tap 6 lead; weld tap 4 to tap 4' to form a new tap 4 lead; weld tap 5 to tap 5' to form a new tap 5 lead.
[0026] Different tap positions are achieved by selecting different tap combinations, for example:
[0027] Maximum tap (e.g., +5%): Connects tap 2 and tap 3, all wires participate in coupling, achieving full-turn coupling. That is, all wires participate in conduction, with the maximum number of turns, and the electromagnetic force is completely balanced.
[0028] Minimum tap (e.g., -5%): Connect tap 6 and tap 7, retaining 10-6' turns of the initial section coil to avoid empty ampere-turns.
[0029] The outer layer of the conductor is wrapped with 0.13mm thick insulating paper or cable paper. The wrapping method is selected according to the voltage level, either half-overlapping or 1 / 3-overlapping (similar to stacking tiles). For example, half-overlapping wrapping (similar to tiles partially covering) is used for high voltage to enhance insulation. 1 / 3-overlapping wrapping (similar to tiles partially covering) is used for medium and low voltage to save materials.
[0030] The above are merely preferred embodiments of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are within its protection scope. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within its protection scope.
Claims
1. A short-circuit protection optimized structure for a high-voltage coil based on multi-wire parallel winding, characterized in that, It includes a sixth tap, a starting section coil 10-6', and four wires; the four wires are wire 6-4', wire 4-2, wire 3-5', and wire 5-7; The first two sections of the coil of the sixth tap include the starting section coil 10-6'. The four wires are wound together with the starting section coil 10-6' as the starting end to form multiple original taps including tap 6', tap 6, tap 4', tap 4, tap 2 lead, tap 3 lead, tap 5', tap 5, and tap 7 lead. Tap 6 and tap 6' are welded to form a new tap 6 lead. Tap 4 and tap 4' are welded to form a new tap 4 lead. Tap 5 and tap 5' are welded to form a new tap 5 lead.
2. The optimized short-circuit protection structure of a high-voltage coil based on multi-wire parallel winding according to claim 1, characterized in that, The optimized structure for short-circuit protection of the high-voltage coil also includes a maximum tap and a minimum tap; the maximum tap is the connection between tap 2 and tap 3; the minimum tap is the connection between tap 6 and tap 7.
3. The optimized short-circuit protection structure of a high-voltage coil based on multi-wire parallel winding according to claim 1, characterized in that, The high-voltage coil has an alternating positive and negative winding structure.
4. The optimized short-circuit protection structure of a high-voltage coil based on multi-wire parallel winding according to claim 1, characterized in that, Each of the aforementioned conductors is covered with cable paper.
5. The optimized short-circuit protection structure of a high-voltage coil based on multi-wire parallel winding according to claim 4, characterized in that, The cable paper covering the conductor is applied in a half-layer or one-third-layer manner.
6. The optimized short-circuit protection structure of a high-voltage coil based on multi-wire parallel winding according to claim 4, characterized in that, The thickness of the cable paper is 0.13 mm.