Special transformer for power grid capacitance voltage-dividing electricity-taking power supply

Abstract

The utility model provides a special transformer for a power grid capacitance voltage-dividing electricity-taking power supply, which relates to the field of electric power grids and comprises a magnetic core, a low-voltage side winding framework and a high-voltage side winding framework. The magnetic cores are two U-shaped iron cores; an air gap adhesive tape pad is arranged between the two U-shaped iron cores; one sides of the two U-shaped iron cores are inserted into the low-voltage side winding framework, and the other sides of the two U-shaped iron cores are inserted into the high-voltage side winding framework; a high-voltage winding coil is wound on the high-voltage side winding framework, and an isolation adhesive tape is arranged between every two layers of the high-voltage winding coil; and a low-voltage winding coil is wound on the low-voltage side winding framework. The high-voltage insulation performance is excellent, voltage fluctuation, lightning impulse and environmental stress can be resisted, and the service life is obviously prolonged. The utility model has the advantages of compact structure, light weight, high demand conversion efficiency and low iron loss under small current, and is suitable for capacitor electricity taking scenes. The device is convenient to produce, suitable for large-scale manufacturing and high in reliability.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of electric power grid, specifically, relate to a kind of for grid capacitor voltage division power supply special transformer. BACKGROUND

[0002] High-voltage capacitor voltage power supply is mainly for power grid 10KV distribution primary and secondary integrated complete set pole circuit breaker equipment power supply, power supply safe and reliable operation is pole circuit breaker switch core, primary and secondary integrated complete set pole circuit breaker continuous development has significantly improved the reliability of 10kV distribution network. It has real-time monitoring of current and voltage information, sensing and communication and other advanced means, gives real-time monitoring of distribution network, intelligent control and rapid response capability to fault, guarantee the reliability of power supply. High-voltage capacitor voltage power supply technology, output power is stable, small in size, easy to install and low in cost, is the mainstream application scheme of state grid, compared with CT power supply, output power is unstable, PT power supply is easy to cause electromagnetic resonance and explosion. The high-voltage side winding of the transformer is connected to 10KV phase voltage at the starting end and grounded at the tail end, and the voltage difference between the two ends is very high. How to ensure the insulation strength of the high-voltage side winding coil and ensure its safe and reliable operation under the influence of voltage fluctuation, lightning flashover and other environments.

[0003] The distance between the existing high-voltage side winding coil of the transformer and the metal surface of the U-shaped core is too close, which can easily cause partial discharge. In addition, the entire power supply is installed outdoors and is affected by temperature difference such as freezing, which can cause partial discharge in humid weather such as rain and fog, greatly reducing the reliability and service life of the power supply. SUMMARY

[0004] The utility model aims at solving the problem that the existing high-voltage side winding coil of the transformer and the metal surface of the U-shaped core are easy to cause partial discharge, and the reliability and service life of the power supply are greatly reduced.

[0005] To solve the above problems, the utility model provides a kind of for grid capacitor voltage division power supply special transformer, including magnetic core, low-voltage side winding framework and high-voltage side winding framework;The magnetic core is composed of two U-shaped cores;Air gap adhesive tape pad is arranged between the two U-shaped cores;One side of the two U-shaped cores is inserted into the low-voltage side winding framework, and the other side of the two U-shaped cores is inserted into the high-voltage side winding framework;High-voltage winding coil is wound on the high-voltage side winding framework, and isolation adhesive tape is arranged between each layer of the high-voltage winding coil;Low-voltage winding coil is wound on the low-voltage side winding framework.

[0006] Compared with the prior art, the utility model has the following beneficial effects, but is not limited to:

[0007] The U-shaped iron core is butted, and a magnetic path gap is naturally formed in the middle. The thickness of the air gap adhesive tape pad is adjusted to accurately control the size of the air gap in the magnetic path, reduce the invalid air gap, and thus greatly reduce the magnetic resistance and improve the magnetic flux efficiency. The air gap adhesive tape pad provides a simple, accurate and low-cost way to set and adjust the air gap, and the open-close type magnetic core is convenient for production and assembly.

[0008] The high-voltage winding frame greatly improves the insulation strength, increases the creepage distance, facilitates the response to outdoor rainy, foggy, dewy and other humid weather, prevents surface leakage and flashover, and realizes layer insulation. The high-voltage winding coil and the isolation adhesive tape realize uniform voltage distribution, solve the interlayer breakdown, and make the interlayer insulation very easy and reliable.

[0009] The utility model discloses high-voltage insulation performance is excellent, tolerates voltage fluctuation, lightning impact and environmental stress, and life is prolonged significantly. The utility model discloses compact structure, light in weight, satisfies primary and secondary equipment fusion design demand. The utility model discloses conversion efficiency is high, and the iron loss is low under mA small current, and is suitable for the electric capacity power supply scene. The utility model discloses production is convenient, is suitable for scale manufacturing, and reliability is high.

[0010] Further, both ends of the extension direction of the low-voltage winding frame are provided with low-voltage side baffles.

[0011] Further, a gap is left between the low-voltage side baffle and the low-voltage winding coil at the most edge; the gap is 3-12mm.

[0012] Further, both ends of the extension direction of the high-voltage winding frame are provided with high-voltage side baffles.

[0013] Further, a gap is left between the high-voltage side baffle and the high-voltage winding coil at the most edge; the gap is 3-12mm.

[0014] Further, a lock catch is arranged on the magnetic core for fixing with the shell.

[0015] Further, a through hole is arranged on the high-voltage side baffle.

[0016] Further, the air gap adhesive tape pad is made of PET material.

[0017] Further, the thickness of the air gap adhesive tape pad is 0.06mm-0.2mm.

[0018] Further, the magnetic core is connected with the grounding wire, and the contact surface of the U-shaped iron core is processed by mirror grinding. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1The structural schematic view of the special transformer for the power supply of the power grid capacitor voltage division is shown in the embodiment of the utility model.

[0020] Figure 2 The side view of the special transformer for the power supply of the power grid capacitor voltage division is shown in the embodiment of the utility model.

[0021] Figure 3 The structural schematic view of the magnetic core is shown in the embodiment of the utility model.

[0022] Figure 4 The structural schematic view of the low-voltage side winding skeleton is shown in the embodiment of the utility model.

[0023] Figure 5 The structural schematic view of the high-voltage side winding skeleton is shown in the embodiment of the utility model.

[0024] Mark explanation:

[0025] 1, magnetic core; 2, low-voltage side winding skeleton; 3, high-voltage side winding skeleton; 4, low-voltage side baffle; 5, high-voltage side baffle; 6, high-voltage winding coil; 7, low-voltage winding coil; 8, through hole; 9, lock catch; 10, isolation adhesive tape; 11, air gap adhesive tape pad. Specific implementation

[0026] In order to make the purpose, technical scheme and advantages of the present application more clear, the technical scheme in the embodiments of the present application will be described clearly and completely in conjunction with the drawings showing the multiple embodiments according to the present application, and it should be understood that the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments described in the present application, all other embodiments obtained by those skilled in the art without creative labor shall belong to the scope of protection of the present application.

[0027] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used in the description herein is for describing particular embodiments only and is not intended to be limiting of the application; the use herein of terms such as "comprise", "comprises", "comprising", "include", "includes", "including", "have", "has", "having", or the like are meant to be open-ended and non-limiting; the use herein of terms such as "first", "second", "third", "fourth", "fifth", "sixth", "seventh", "eighth", "ninth", "tenth" and the like, merely identify content of the terms as distinguished from other content, rather than describing a specific sequential or chronological order. Also, the terms "first", "second", "third", "fourth", "fifth", "sixth", "seventh", "eighth", "ninth", "tenth" and the like, are used herein for descriptive purposes only and are not to be construed as indicating or implying a relative importance or a specific order in connection with which the features are indicated. It is to be understood that a "first", "second", "third", "fourth", "fifth", "sixth", "seventh", "eighth", "ninth", "tenth" and the like can implicitly or explicitly include one or more of the indicated features. In the description of the present application, unless otherwise stated and limited, the term "a plurality of" means two or more.

[0028] In the description of the present application, it should be understood that the terms "upper", "lower", "left", "right", "front", "rear", and the like indicate the orientation or positional relationship shown in the drawings based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements indicated must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present application.

[0029] In the description of the present application, it should be understood that, unless otherwise specified and limited, the terms "mounting", "connecting", "connection", "attaching" should be understood broadly, for example, can be fixedly connected, or can be detachably connected, or integrally connected; can be directly connected, or indirectly connected through an intermediate medium, or can be connected inside two elements. Those skilled in the art can understand the specific meaning of the above terms in the present application according to the specific circumstances.

[0030] It should be emphasized that the term "comprises / comprising" when used in this specification is taken to specify the presence of stated features, integers, steps or components but does not preclude the presence or addition of one or more other features, integers, steps, components, or groups thereof.

[0031] The term "and / or" in the present application is only used to describe the relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the three cases of A alone, A and B together, and B alone.

[0032] The focus of the utility model is the insulation strength of the high-voltage side single-coil wire and the insulation strength between the coil and the core, and the partial discharge between the core and the coil is reduced.

[0033] Referring to Figures 1-5 The utility model discloses an electric network electric capacity voltage division power supply special transformer, including magnetic core 1, low voltage side winding skeleton 2 and high voltage side winding skeleton 3, the magnetic core 1 is two U type cores and is formed;

[0034] Two U type cores are provided with air gap adhesive tape pad 11 between them;

[0035] One side of the two U type cores is inserted into the low voltage side winding skeleton 2, and the other side of the two U type cores is inserted into the high voltage side winding skeleton 3;

[0036] The high voltage side winding skeleton 3 is provided with a high voltage winding coil 6, and an isolation adhesive tape 10 is provided between each layer of the high voltage winding coil 6;

[0037] The low voltage side winding skeleton 2 is provided with a low voltage winding coil 7;

[0038] In the embodiment, the winding mode of the high voltage winding coil 6 on the high voltage side winding skeleton 3 can be layer winding, and after winding a layer of high voltage winding coil 6, a layer of isolation adhesive tape 10 is wound, which can effectively reduce the voltage difference and uniformly distribute the voltage of the high voltage side in each layer. 40=200KV, which greatly improves the insulation reliability.

[0039] The low voltage side winding skeleton 2 and the high voltage side winding skeleton 3 improve the insulation strength between the high voltage side and the low voltage side winding, and separate the two skeletons for winding, which can improve the creepage distance between the high voltage side winding coil and the U type core, and add a baffle to the two ends of the high voltage side skeleton to reduce the partial discharge.

[0040] The transformer overall structure and magnetic circuit design are the biggest advantages of the utility model, the integrated high-voltage wire package framework and U-shaped core are completely isolated, the open-close type U-shaped core is convenient to install, namely, the magnetic core can be composed of two U-shaped cores, the winding framework can be wound layer by layer independently, the batch production requirement is met, meanwhile, the capacitor power supply two technical routes CL mode and CCL mode are completely considered, the inductance of the CCL resonance mode transformer can be adjusted by the size of the air gap of the U-shaped core section, the air gap adhesive pad 11 can be pasted, the size of the air gap is controlled by replacing the air gap adhesive pad 11 with different thickness, the CL mode does not paste the adhesive tape, the U-shaped core section can be precisely ground, the magnetic flux leakage is reduced, and the transformer conversion efficiency is improved.

[0041] The transformer is applied to a 10KV high-voltage environment and belongs to primary equipment, but is a common small-size electronic transformer, which needs to ensure high-voltage insulation lightning impulse requirements and be small, precise and light in weight, and belongs to the fusion design application of primary and secondary equipment.

[0042] The maximum current of the high-voltage side incoming line end is 10mA, the small current has higher requirements on the transformer core loss and conversion efficiency, the CD type is adopted to cut the open-close core, in order to reduce the magnetic flux leakage, the closed contact surface of the core needs to be mirror ground, and a very high process level is required for the core production, the existing high-voltage transformer is generally a ring-shaped core, the production process is complex and the efficiency is low if the integrated framework and layer-by-layer winding method are adopted, or the sheet material is stacked and connected to the core, and the excitation current is small under the working current of 10mA, and the transformer loss is serious.

[0043] The high-voltage side winding framework of the utility model adopts an integrated molding process, improves the insulation strength between the whole winding and the U-shaped core, and reduces the partial discharge, the whole winding structure is optimized, the framework is wound independently, one layer of wire is wound with one layer of adhesive tape, and the coil is wound, then vacuum impregnation insulation glue is extracted, the whole coil insulation strength is increased, and the reliability is improved.

[0044] In the CL mode application, the contact surface of the U-shaped core is mirror ground to reduce the air gap and the magnetic flux leakage, in the CCL mode, the inductance value is adjusted by the thickness of the air gap adhesive pad, the working current of the high-voltage side is less than or equal to 10mA, and the U-shaped core is optimized to ensure efficient energy conversion.

[0045] The magnetic core 1 is a core magnetic component as a main body of a magnetic circuit of a transformer, and is responsible for efficient conduction and conversion of magnetic field energy. By butt joint of the U-shaped core, a magnetic circuit gap is naturally formed in the middle. The thickness of the air gap adhesive tape pad 11 is adjusted to accurately control the size of the air gap in the magnetic circuit. Reduce the iron loss: the CD type U-shaped core magnetic circuit is optimized, and the leakage magnetic is relatively small. In particular, in the CL mode, by mirror polishing the butt joint surface of the U-shaped core, the contact surface can be extremely smooth, the invalid air gap is reduced, the magnetic resistance is greatly reduced, and the magnetic flux efficiency is improved. This is crucial for capacitor power supply applications with a tiny primary current of only 10mA, which can effectively avoid the problem of serious transformer loss caused by too small excitation current. Realize the inductance adjustment, compatible with two technical routes: this is one of the core innovations of the utility model. For CCL resonance mode, a stable and moderate inductance value is obtained through a large air gap. The air gap adhesive tape pad provides a simple, accurate and low-cost way to set and adjust the air gap, so that transformers with consistent inductance values can be mass produced. For the CL mode, a small air gap is needed to reduce the leakage inductance, and the U-shaped core section can be polished at this time.

[0046] The magnetic core 1 of the utility model is convenient for production and assembly, and the open-close type design, that is, the two U-shaped cores can be easily inserted into the skeleton with the coil wound like a "clip", and the production process is much simpler and more efficient than the split winding ring-shaped U-shaped core or the traditional U-shaped core which needs to be laminated and mortised, so it is suitable for mass production.

[0047] The high-voltage winding skeleton 3 is a high-voltage insulation and support main body, which is a support and positioning of the device, and provides physical support and accurate positioning for the high-voltage winding coil, and serves as a main insulation barrier between the high-voltage coil and the U-shaped core.

[0048] The high-voltage winding skeleton 3 greatly improves the insulation strength and eliminates partial discharge: the integrated forming process avoids the weak points such as joints and bubbles that may exist in the splicing of multiple components, so that the entire skeleton becomes a complete and dense insulator. This ensures that there is no breakdown or surface discharge between the coil and the U-shaped core under the high voltage of 5774V and various impulse overvoltages.

[0049] The high-voltage winding skeleton 3 increases the creepage distance, and the height and diameter of the skeleton itself, combined with the baffle, cleverly increase the creepage distance from the high-voltage coil to the U-shaped core. This is a key design to prevent surface leakage and flashover in response to humid weather such as rain, fog and condensation.

[0050] The high-voltage winding skeleton 3 provides a basis for layered winding method, and its structure design is specially adapted to the advanced technology of "layered winding".

[0051] The high-voltage winding coil 6 is wound by multiple layers of enameled copper wires, and isolation tapes are wrapped between the layers, so that the total voltage applied to the high-voltage side, such as 5774V, is evenly distributed to each layer of the coil. The isolation tapes physically isolate the adjacent coil layers and bear the potential difference between them, achieving interlayer insulation.

[0052] The high-voltage winding coil 6 and the isolation tapes 10 achieve uniform voltage distribution and solve the problem of interlayer breakdown: this is the most core insulation technical innovation of the application. In the traditional whole-winding method, the adjacent turns between layers may bear a very high voltage and are easily broken down at a point. Through the layered winding method, the 5774V voltage is divided by 40 layers, and each layer only needs to bear a voltage difference of about 144.3V. This makes interlayer insulation very easy and reliable.

[0053] The high-voltage winding coil 6 and the isolation tapes 10 greatly improve the overall insulation withstand voltage. The withstand voltage of each layer of insulation tape is >4000V, which is much greater than the actual voltage of 144.3V it needs to bear, forming a large safety margin. In theory, the total withstand voltage of this series multi-layer insulation structure is the sum of the withstand voltage of each layer, i.e. 5000V / layer 40 layers = 200kV, so that the transformer can easily withstand the power grid operating overvoltage and lightning impact, and the reliability has been qualitatively improved.

[0054] The air gap tape pad 11 is used to adjust the air gap and control the inductance. It improves the partial discharge of the high-voltage side winding coil and the U-shaped core, the U-shaped core is grounded, and the discharge is reduced.

[0055] The utility model discloses a high-voltage insulation performance is excellent, withstands voltage fluctuation, lightning impact and environmental stress, and life is prolonged significantly. The utility model discloses compact structure, light in weight, satisfy primary and secondary equipment fusion design demand. The utility model discloses conversion efficiency is high, and the iron loss is low under 10mA small current, and is suitable for the electric capacity scene of taking electricity. The utility model discloses production is convenient, is suitable for scale manufacturing, and the reliability is high.

[0056] Further, both ends of the low-voltage side winding framework 2 in the extension direction are provided with low-voltage side baffles 4.

[0057] The low-voltage side winding framework 2 and the low-voltage side baffle 4 realize isolation and safety, completely separate the low-voltage winding and the high-voltage winding, and are installed on the other side of the U-shaped core, realizing electrical isolation between the high-voltage and the low-voltage. The low-voltage side baffle has the same effect as the high-voltage side, mainly preventing the low-voltage coil from contacting the U-shaped core or other components, and increasing insulation safety.

[0058] The low-voltage side winding framework 2 and the low-voltage side baffle 4 increase the insulation strength between the low-voltage windings: by "separating two frameworks and winding respectively, and pulling apart the safety distance", the insulation breakdown fault that may occur due to the close proximity of the high-voltage and low-voltage windings is completely avoided, in line with the safety design principle of high-voltage equipment.

[0059] Further, a gap is left between the low-voltage side baffle 4 and the low-voltage winding coil 7 at the edge; the gap is 3-12 mm; the coil edge maintains a safety gap of 3-12 mm, effectively eliminating the risk of edge discharge; preventing the coil from being damaged during transportation and installation, forming mechanical protection.

[0060] Further, the high-voltage side baffle 5 is arranged at both ends of the extension direction of the high-voltage side winding framework 3; the high-voltage side baffle 5 prevents partial discharge and mechanical protection; extends the creepage distance, effectively increases the surface distance between the high-voltage component and the U-shaped core, i.e. ground potential, through its own structure and high-low baffles. The baffle forms a "barrier" at the outermost side, forcing the possible surface discharge path to bypass the baffle, greatly increasing the creepage distance. Preventing coil edge discharge, the end of the high-voltage coil is the place where the electric field is most concentrated, and is most likely to discharge to the U-shaped core or air. The baffle separates the coil from the external environment such as the grounded metal shell. Preventing the coil from being damaged during transportation and installation, forming mechanical protection.

[0061] The high-voltage side baffle 5 solves the problem of outdoor partial discharge: directly solves the problems of "too close distance between winding and U-shaped core causing partial discharge" and "wet weather causing partial discharge" mentioned in the background technology. This simple and effective design is an indispensable part of ensuring the reliable operation of the transformer outdoors for many years.

[0062] Further, a gap is left between the high-voltage side baffle 5 and the high-voltage winding coil 6 at the edge; the gap is 3-12 mm; and the coil edge maintains a safety gap of 3-12 mm, effectively eliminating the risk of edge discharge.

[0063] Further, the magnetic core 1 is provided with a lock 9; the lock 9 is used to fix the U-shaped core, and facilitates the fixation between the magnetic core 1 and the external shell, increasing safety.

[0064] Further, the high-voltage side baffle 5 is provided with a through hole 8; the through hole 8 facilitates the fixation of the subsequent transformer, and is beneficial to the installation, disassembly, transportation, etc. of the device.

[0065] Further, the air gap adhesive tape pad 11 is made of PET material; the air gap adhesive tape pad 11 made of PET material is used to adjust the air gap and control the inductance.

[0066] Further, the thickness of the air gap adhesive tape pad 11 is 0.06 mm-0.2 mm. Adjusting the thickness of the air gap adhesive tape pad 11 facilitates the accurate adjustment of the air gap and the control of the inductance.

[0067] Further, the magnetic core 1 is connected with the ground wire, and the contact surface of the U-shaped core is provided by mirror surface polishing treatment. The U-shaped core is grounded to reduce discharge. The U-shaped core is grounded to facilitate elimination of floating potential and prevent discharge. If the U-shaped core is not grounded, it can be in a floating and uncertain potential due to capacitive coupling, and is easy to cause potential difference with surrounding components, thereby causing discharge. After reliable grounding, the potential of the U-shaped core is fixed, i.e. the ground potential, and the discharge phenomenon is completely eliminated, and the operation safety is improved.

[0068] The improvement and technical innovation points of the utility model include:

[0069] The utility model adopts layered winding method, and a layer of isolation tape 10 is wound behind the high-voltage winding coil 6, so that the high-voltage side voltage is uniformly distributed to each layer of high-voltage winding coil 6. The insulation resistance of the isolation tape 10 is high, and the total insulation resistance is significantly improved in combination with the self-voltage resistance of the coil, the reliability is significantly enhanced, and the turn-to-turn insulation strength between the high-voltage side winding layers is improved.

[0070] The utility model is designed by separating the low-voltage winding frame 2 and the high-voltage winding frame 3, i.e. the low-voltage winding frame 2 and the high-voltage winding frame 3 are designed separately, the high-voltage side and the low-voltage side winding are physically isolated, the safety distance is increased, breakdown is avoided, and the insulation strength between the high-voltage side winding and the low-voltage side winding is improved.

[0071] The utility model adds high-voltage side baffles 5 on both sides of the high-voltage winding frame 3, effectively reduces local discharge, and improves the creepage distance between the high-voltage side winding and the U-shaped core.

[0072] Although the utility model discloses the above, the protection scope of the utility model disclosed is not limited to this. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the utility model disclosed, and these changes and modifications will fall within the protection scope of the utility model.

Claims

1. A special transformer for a power grid capacitor voltage division power supply, characterized in that, Including magnetic core (1), low voltage side winding skeleton (2) and high voltage side winding skeleton (3);The magnetic core (1) is two U-shaped cores;Two U-shaped cores are provided with air gap adhesive tape pad (11) between;Two U-shaped cores are inserted into the low voltage side winding skeleton (2) on one side, and the other side of two U-shaped cores is inserted into the high voltage side winding skeleton (3);High voltage winding coil (6) is wound on high voltage side winding skeleton (3), and isolation adhesive tape (10) is arranged between each layer of high voltage winding coil (6);Low voltage winding coil (7) is wound on low voltage side winding skeleton (2).

2. The special transformer for the power grid capacitance voltage division power supply of claim 1, wherein, Both ends of the low voltage side winding skeleton (2) in the extension direction are provided with low voltage side baffle (4).

3. The special transformer for the power grid capacitance voltage division power supply of claim 2, wherein, The low voltage side baffle (4) and the most edge low voltage winding coil (7) are left with a gap;The gap is 3-12mm.

4. The special transformer for the power grid capacitance voltage division power supply of claim 3, wherein, Both ends of the high voltage side winding skeleton (3) in the extension direction are provided with high voltage side baffle (5).

5. The special transformer for the power grid capacitance voltage division power supply of claim 4, wherein, The high voltage side baffle (5) and the most edge high voltage winding coil (6) are left with a gap;The gap is 3-12mm.

6. The special transformer for the power grid capacitance voltage division power supply of claim 5, wherein, The magnetic core (1) is provided with a lock (9) for fixing with the shell.

7. The special transformer for the power grid capacitance dividing power supply of claim 6, characterized in that, The high voltage side baffle (5) is provided with a through hole (8).

8. The special transformer for the power grid capacitance dividing power supply of claim 7, characterized in that, The air gap adhesive tape pad (11) is made of PET material.

9. The special transformer for the power grid capacitance dividing power supply of claim 8, characterized in that, The thickness of the air gap adhesive tape pad (11) is 0.06mm~0.2mm.

10. The special transformer for a power grid capacitance dividing power supply according to claim 9, characterized in that, The magnetic core (1) is connected with the ground wire, and the contact surface of the U-shaped core is treated by mirror surface grinding.

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