CN113990631A - Anti-resonance voltage transformer for high-voltage distribution network - Google Patents

Abstract

The invention discloses an anti-resonance voltage transformer for a high-voltage distribution network, which comprises an iron core and an insulating framework sleeved outside the iron core, wherein a plurality of annular insulating partition plates for dividing the insulating framework into a plurality of sections are arranged on the insulating framework, each insulating partition plate comprises a first insulating partition plate with a radial opening formed in the outer periphery and a second insulating partition plate with a round hole formed in the inner periphery, the first insulating partition plate and the second insulating partition plate are arranged in a crossed mode, each section of the insulating framework is wound with a winding, adjacent windings are connected through the round holes and the openings, and the positions, close to the insulating framework, of the openings are flush with the outer periphery of the windings. The winding coiling is the multistage, realizes more turns, effectively improves the saturation voltage of mutual-inductor, and each section is separated by the baffle, has increased creepage distance, is provided with round hole and rectangle opening on the baffle, easily operates when having guaranteed the coil coiling, and the rectangle opening has guaranteed that the lead wire height is unanimous with the winding height, has avoided lead wire position to form most advanced and then lead to the problem of discharging.

Description

Anti-resonance voltage transformer for high-voltage distribution network

Technical Field

The invention relates to the technical field of transformers, in particular to an anti-resonance voltage transformer for a high-voltage distribution network.

Background

The voltage transformer is used as an important component of the power distribution network, and plays roles in electric energy metering, voltage measurement and signal transmission for relay protection in the power distribution network. At present, most of 10kV voltage transformers for power distribution networks are made of epoxy resin through casting insulation and adopting an electromagnetic induction principle, and the 10kV voltage transformers have decades of use experiences in China. However, due to the characteristic that the neutral point of the power distribution network is not grounded, the phenomenon that the transformer and the line resonate under the induction of lightning stroke, switching, single-phase grounding and the like causes the saturation of the voltage transformer, and further causes the burning-out accident of the transformer to happen frequently.

Because of the principle of electromagnetic induction, the improvement of the saturation resistance of the voltage transformer can only be carried out by two modes of increasing the section of an iron core and increasing the number of turns, but because the limit value of the product volume is limited, the two modes have certain limit values, and the requirement of safe operation cannot be met.

Disclosure of Invention

The technical problem to be solved by the invention is as follows: the anti-resonance voltage transformer for the high-voltage distribution network can solve the problem of coil point discharge.

In order to solve the technical problems, the invention adopts a technical scheme that: the utility model provides an anti resonance voltage transformer for high voltage distribution network, establishes the insulating skeleton outside the iron core including iron core and cover, insulating skeleton is last to have a plurality of ring shape insulating barrier who separates into the multistage with insulating skeleton, insulating barrier includes that the periphery is opened the first insulating barrier who has radial opening and the second insulating barrier that the interior week has the round hole, first insulating barrier with second insulating barrier cross arrangement, all around having the winding on each section of insulating skeleton, connecting through round hole and opening between the adjacent winding, the opening is close to insulating skeleton department and keeps level with the winding periphery.

The invention has the beneficial effects that: the utility model provides a high voltage distribution is anti resonance voltage transformer for net, the winding coiling is the multistage, realizes more turns, effectively improves the saturation voltage of mutual-inductor, and each section is separated by the baffle, has increased creepage distance, is provided with round hole and rectangle opening on the baffle, easily operates when having guaranteed the coil coiling, and the rectangle opening has guaranteed that the lead wire height is unanimous with the winding height, has avoided lead wire position to form most advanced and then lead to the problem of discharging.

Drawings

Fig. 1 is a schematic cross-sectional structure diagram of an anti-resonance voltage transformer for a high-voltage distribution network according to an embodiment of the present invention;

FIG. 2 is an enlarged schematic view at A in FIG. 1;

fig. 3 is an enlarged schematic view of fig. 2 at B.

Description of reference numerals:

1. an iron core; 2. an insulating framework; 3. an insulating spacer; 31. opening the gap; 32. a circular hole; 4. a primary winding; 5. and (4) insulating paper.

Detailed Description

In order to explain technical contents, achieved objects, and effects of the present invention in detail, the following description is made with reference to the accompanying drawings in combination with the embodiments.

Referring to fig. 1 to 3, an embodiment of the present invention provides an anti-resonance voltage transformer for a high voltage distribution network, including an iron core and an insulating framework sleeved outside the iron core, where the insulating framework is provided with a plurality of annular insulating partition plates dividing the insulating framework into a plurality of sections, each insulating partition plate includes a first insulating partition plate having a radial opening at an outer periphery thereof and a second insulating partition plate having a circular hole at an inner periphery thereof, the first insulating partition plate and the second insulating partition plate are arranged in a cross manner, each section of the insulating framework is wound with a winding, adjacent windings are connected by the circular hole and the opening, and a position of the opening near the insulating framework is flush with an outer periphery of the winding.

As can be seen from the above description, the beneficial effects of the present invention are: the winding coiling is the multistage, realizes more turns, effectively improves the saturation voltage of mutual-inductor, and each section is separated by the baffle, has increased creepage distance, is provided with round hole and rectangle opening on the baffle, easily operates when having guaranteed the coil coiling, and the rectangle opening has guaranteed that the lead wire height is unanimous with the winding height, has avoided lead wire position to form most advanced and then lead to the problem of discharging.

Furthermore, the insulating framework is uniformly divided by the insulating partition plates, and the number of turns of each section of winding is the same.

From the above description, it can be known that the voltage between the segments is uniformly decreased, more turns can be realized, and the saturation resistance is better.

Further, the insulating framework and the insulating partition plate are integrally formed.

According to the above description, the insulating framework and the insulating partition plate are integrally formed, so that the insulating materials between the sections are consistent, and the split type structure is prevented from forming an air gap between the framework and the partition plate to generate discharge.

Further, the insulating framework and the insulating partition plate are made of polytetrafluoroethylene.

The above description shows that the insulating strength of the material can reach 200kv/mm, the arc resistance is more than 300s, and the insulating property of the insulating framework is effectively ensured.

Further, each section of the winding is multilayer, and the layers are separated by insulating paper.

From the above description, the insulating paper improves the insulation between winding layers and improves the overvoltage resistance: the creepage distance between layers is increased, and the interlayer insulation is improved.

Further, the insulating paper is specifically a capacitor composite paper.

As can be seen from the above description, the composite paper for the capacitor is uniform and compact in paper quality, free of holes, thin like cicada wing, 4-10 μm thick, high in mechanical strength, and good in air permeability and chemical purity.

Further, the notch and the round hole are provided with lead clamps.

It can be seen from the above description that the lead clip facilitates the fixation of the wire when passing through the circular hole, making the winding easier and making the connection of the windings between the segments easier.

Furthermore, the material of the lead clamp is red copper.

As can be seen from the above description, red copper has the advantages of durability, cold resistance, heat resistance, pressure resistance, corrosion resistance and fire resistance, has the high strength of metal, and can be suitable for long-term use in various environments.

Furthermore, the winding wound on the insulating framework is specifically a high-voltage winding, the iron core is wound with a low-voltage winding, and the insulating framework is sleeved outside the low-voltage winding.

According to the description, the low-voltage winding is wound on the iron core, and the insulating framework is sleeved outside the low-voltage winding, so that the number of turns can be increased on the premise of not increasing the size of the transformer.

Further, the low-voltage winding is an enameled rectangular copper wire winding.

As can be seen from the above description, the enameled rectangular copper wire has a higher filling factor and a stronger loading capacity.

The anti-resonance voltage transformer for the high-voltage power distribution network is applied to the high-voltage power distribution network, plays roles in electric energy metering and voltage measurement and signal transmission for relay protection, and is applied to a 10KV power distribution network.

Example one

Referring to fig. 1 to 3, an anti-resonance voltage transformer for a high voltage distribution network of the present embodiment includes an iron core and an insulating skeleton, a primary winding is used as a high voltage winding for connecting with an external high voltage power grid, and is wound on the insulating skeleton, and a secondary winding is used as a low voltage winding for outputting signals and is wound on the iron core.

Insulating skeleton adopts the polytetrafluoroethylene material to make, the dielectric strength of this material can reach 200kv/mm, arc resistance is greater than 300s, the insulating properties of insulating skeleton has effectively been guaranteed, insulating skeleton is last to have a plurality of ring form baffles that evenly separate into the multistage with the skeleton, the baffle is interior to be unanimous with insulating skeleton diameter, in this embodiment, 9 total baffles, separate into 8 sections with insulating skeleton, number the baffle in proper order and be 1-9, process the rectangle opening in odd number baffle periphery, preferred opening degree of depth 10mm, at the even number baffle internal circumference processing round hole, preferred aperture 2mm, be provided with wall thickness 1mm between each rectangle opening and round hole, the material is red copper's lead clamp.

In this embodiment, insulating skeleton and each baffle are the polytetrafluoroethylene material, and insulating skeleton and each baffle integrated into one piece avoid having the air gap to lead to discharging between insulating skeleton and the baffle.

When the primary winding is wound, the starting end of the primary winding passes through the lead wire clamp in the bottom round hole of the even-numbered partition plate, and then the winding is started. And after the second layer of lead wire is wound, a layer of insulating paper is padded, and then the second layer of lead wire is tiled and wound, wherein the insulating paper is preferably 0.07 thick capacitor composite paper.

And winding to the specified number of turns and layers according to the method, wherein the outer diameter of the wound primary winding is 10mm smaller than the outer diameter of the insulating framework so as to improve the creepage distance between the primary windings and enhance the lightning impact resistance, the tail end of the primary winding is placed in the lead wire clamp with the rectangular opening, at the moment, the periphery of the primary winding is just level with the bottom of the rectangular opening, then another section of lead wire is wound in the opposite direction according to the same mode, and the first turn and the last turn of each section of lead wire are both in the corresponding lead wire clamp.

And winding the other sections of lead wires in the same way, clamping and pinching the round hole of the partition plate and the lead wires in the rectangular notch after the winding is finished, and connecting and fixing the sections of lead wires together. The round hole and the rectangular opening not only ensure that the coil is easy to operate during winding, but also ensure that the height of the lead is consistent with that of the winding due to the rectangular opening, and the problem that the lead is pointed and then discharged due to the position of the lead is avoided.

In summary, according to the anti-resonance voltage transformer for the high-voltage distribution network, the primary winding is wound into 8 sections, the voltage between the sections is reduced to 1/8, more turns are achieved, the saturation voltage of the transformer is effectively improved, each section is separated by the partition plate integrally formed with the framework, the insulation materials between the sections are consistent, air gaps between the framework and the partition plate caused by splitting are prevented from generating discharge, circular holes and rectangular openings are formed in the partition plate, operation is easy to achieve when the coil is wound, the height of the lead is consistent with the height of the winding due to the rectangular openings, the problem that the lead position forms a tip to cause discharge is avoided, and the winding has the advantages of small overall size and compact structure.

The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all equivalent changes made by using the contents of the present specification and the drawings, or applied directly or indirectly to the related technical fields, are included in the scope of the present invention.

Claims (10)

1. The utility model provides a high voltage distribution network is with anti resonance voltage transformer which characterized in that: establish the insulating skeleton outside the iron core including iron core and cover, insulating skeleton is last to have a plurality of ring shape insulating barrier who separates into the multistage with insulating skeleton, insulating barrier includes that the periphery is opened the first insulating barrier who has radial opening and the second insulating barrier that the inner periphery has the round hole, first insulating barrier with the second insulating barrier cross arrangement, all around having the winding on every section of insulating skeleton, connecting through round hole and opening between the adjacent winding, the opening is close to insulating skeleton department and keeps level with the winding periphery.

2. The anti-resonance voltage transformer for the high-voltage distribution network according to claim 1, characterized in that: the insulating framework is uniformly separated by the insulating partition plate, and the number of turns of each section of winding is the same.

3. The anti-resonance voltage transformer for the high-voltage distribution network according to claim 1, characterized in that: the insulating framework and the insulating partition plate are integrally formed.

4. The anti-resonance voltage transformer for the high-voltage distribution network according to claim 1, characterized in that: the insulating framework and the insulating partition plate are made of polytetrafluoroethylene.

5. The anti-resonance voltage transformer for the high-voltage distribution network according to claim 1, characterized in that: each section of winding is multilayer, and the layers are separated by insulating paper.

6. The anti-resonance voltage transformer for the high-voltage distribution network according to claim 5, wherein: the insulating paper is specifically capacitor composite paper.

7. The anti-resonance voltage transformer for the high-voltage distribution network according to claim 1, characterized in that: the notch and the round hole are provided with lead clamps.

8. The anti-resonance voltage transformer for the high-voltage distribution network according to claim 7, wherein: the lead clip is made of red copper.

9. The anti-resonance voltage transformer for the high-voltage distribution network according to claim 1, characterized in that: the winding wound on the insulating framework is specifically a high-voltage winding, the iron core is wound with a low-voltage winding, and the insulating framework is sleeved outside the low-voltage winding.

10. The anti-resonance voltage transformer for the high-voltage distribution network according to claim 9, characterized in that: the low-voltage winding is an enameled flat copper wire winding.

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