Wiring mode of three-phase integrated on-load switch for autotransformer

Abstract

According to the wiring mode of the three-phase integrated on-load switch for the autotransformer, a low-voltage coil, a high-voltage coil and a voltage regulating coil are sequentially arranged in the transformer from inside to outside, and three coil sets are arranged in the voltage regulating coil in a connected mode through voltage regulating wires. The side surface of the outer side of the voltage regulating coil is fixedly provided with an on-load switch, the on-load switch is a three-phase integrated switch, the on-load switch is respectively connected with each coil group through a lead wire, the voltage regulating coil is connected with a lightning arrester through two cables, and the lightning arrester is connected with the voltage regulating coil. And each group of voltage regulating coils is connected with a lightning arrester through a lightning protection guide, so that a three-phase integrated on-load switch voltage regulating mode is adopted, the size of the transformer is reduced, the cost is reduced, the production efficiency is improved, the error rate in the production process is reduced, the production and the installation are convenient, and the production efficiency is improved. And the problems of low production efficiency, increased cost and the like caused by the on-load tap changer of the oil-immersed autotransformer can be effectively solved.

Description

Technical Field

[0001] The present invention belongs to the technical field of transformer three-phase switches, and specifically relates to a wiring method of a three-phase integrated on-load switch for an autotransformer. Background Art

[0002] Distribution transformer is one of the important equipment in the power supply and distribution system of industrial and mining enterprises and civil buildings. It is a device that uses the principle of electromagnetic induction to change the AC voltage. The main components are the primary coil, secondary coil and iron core (magnetic core), among which oil-immersed transformer is a common one.

[0003] At present, oil-immersed autotransformer high load voltage regulators mostly use three single-phase load voltage regulators. The use of three single-phase switches in the design leads to a larger transformer oil tank and an increase in transformer oil volume; in the production process, the three switches are placed between phases, and the insulation distance between the lead wire to the coil, the lead wire to the oil tank, and the lead wire to the lead wire must be considered when wiring the leads. This not only wastes the valuable time of designers and workshop workers, but also poses a risk of errors. Summary of the invention

[0004] In order to solve the above problems, this paper proposes a wiring method for a three-phase integrated on-load switch for an autotransformer. The inside of the transformer is provided with a low-voltage coil, a high-voltage coil and a voltage regulating coil from the inside to the outside. The inside of the voltage regulating coil is provided with three groups of coil groups connected by voltage regulating wires. The outer side of the voltage regulating coil is fixedly provided with an on-load switch. The on-load switch is a three-phase integrated integral switch. The on-load switch is connected to each group of coil groups through lead wiring. The voltage regulating coil is connected to the lightning arrester through two cables. The voltage regulating coil of each group is connected to the lightning arrester through a lightning protection guide. The purpose is to use the three-phase integrated on-load switch voltage regulation method to reduce the size of the transformer, reduce the cost, improve the production efficiency, and reduce the error rate in the production process. It is easy to produce and install, and can effectively solve the problems of low production efficiency and increased cost caused by the on-load voltage regulating switch of the oil-immersed autotransformer.

[0005] The transformer is a body winding type transformer, with a body inside the transformer, the body being in the shape of a cylindrical winding body, with low-voltage coils, high-voltage coils and voltage regulating coils arranged from the inside to the outside, the low-voltage coils and the high-voltage coils being connected and interlaced coils, a ground screen being arranged between the low-voltage coils and the high-voltage coils, a voltage regulating coil being arranged on the outside of the high-voltage coil, and the high-voltage coil and the voltage regulating coil being connected to each other through a wire. When the transformer is in the full-wave state, the voltage difference between the head and the end of the voltage regulating coil exceeds the limit voltage of the switch. In order to protect the switch and prevent overvoltage, two cables are additionally drawn out from the head and the end of the voltage regulating coil to connect to the lightning arrester, and each of the three voltage regulating coils needs to be connected to a lightning arrester.

[0006] The voltage regulating coil is a winding coil, a lightning arrester is arranged on the top of the voltage regulating coil, cables are arranged on the outer edges of both sides of the voltage regulating coil, the voltage regulating coil is connected to the lightning arrester through two cables on both sides, the wiring of the on-load switch is consistent with the wiring of the conventional switch and is connected to the voltage regulating coil, the voltage regulation of the transformer can be reliably realized through the three-phase integrated on-load voltage regulating switch, at the same time, the size of the transformer is reduced, the cost is reduced, the production efficiency is improved, and the error rate in the production process is reduced.

[0007] Beneficial effects:

[0008] Through the analysis and summary of on-load voltage regulators of various manufacturers, a method of voltage regulation using a three-phase integrated on-load voltage regulator for autotransformers was invented. The three-phase integrated on-load voltage regulator is placed on the side of the device body, which ensures the insulation distance between the leads and the leads, and between the leads and the oil tank. At the same time, it reduces the size of the transformer, reduces costs, improves production efficiency and reduces the error rate in the production process.

[0009] The purpose is to use the three-phase integrated on-load switch voltage regulation method to reduce the size of the transformer, reduce costs, improve production efficiency and reduce the error rate in the production process.

[0010] It is easy to produce and install, and can effectively solve the problems of low production efficiency and increased costs caused by on-load voltage regulators of oil-immersed autotransformers. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is an assembly diagram of the wiring method of a three-phase integrated on-load switch for an autotransformer;

[0012] Figure 2 It is a circuit connection diagram of the wiring method of a three-phase integrated on-load switch for an autotransformer;

[0013] In the figure; 1. low-voltage coil, 2. high-voltage coil, 3. voltage regulating coil, 4. lightning arrester, 5. on-load switch, 6. voltage regulating wire, 7. lightning arrester, 8. coil group. DETAILED DESCRIPTION

[0014] In order to deepen the understanding of the present invention, the present invention will be further described in detail below with reference to embodiments and drawings. The embodiments are only used to explain the present invention and do not constitute a limitation on the protection scope of the present invention.

[0015] Low voltage coil 1, high voltage coil 2, voltage regulating coil 3, lightning arrester 4, on-load switch 5, voltage regulating wire 6, lightning arrester wire 7, coil group 8.

[0016] like Figure 1 , 2 As shown;

[0017] A wiring method for a three-phase integrated on-load switch 5 for an autotransformer, wherein a low-voltage coil 1, a high-voltage coil 2 and a voltage regulating coil 3 are arranged in sequence from the inside to the outside of the transformer, wherein the inside of the voltage regulating coil 3 is provided with three groups of coil groups 8 connected by voltage regulating wires 6, and an on-load switch 5 is fixedly arranged on the outer side of the voltage regulating coil 3, wherein the on-load switch 5 is a three-phase integrated integral switch, wherein the on-load switch 5 is respectively connected to each group of coil groups 8 by lead wiring, wherein the voltage regulating coil 3 is connected to a lightning arrester 4 by two cables, wherein each group of the voltage regulating coil 3 is connected to the lightning arrester 4 by a lightning protection guide, and the transformer is a body winding transformer, wherein the inside of the transformer is provided with a body, wherein The shape of the device body is a cylindrical winding device body, and the device body is provided with a low-voltage coil 1, a high-voltage coil 2 and a voltage regulating coil 3 from the inside to the outside. The low-voltage coil 1 and the high-voltage coil 2 are connected and interlaced coils, and a ground screen is provided between the low-voltage coil 1 and the high-voltage coil 2. The outer side of the high-voltage coil 2 is provided with a voltage regulating coil 3, and the high-voltage coil 2 and the voltage regulating coil 3 are connected to each other through a wire. The voltage regulating coil 3 is a winding coil, and a lightning arrester 4 is provided on the top of the voltage regulating coil 3. Cables are provided on the inner and outer sides of the voltage regulating coil 3. The voltage regulating coil 3 is connected to the lightning arrester 4 through two cables on both sides. The wiring of the on-load switch 5 is consistent with the wiring of a conventional switch and is connected to the voltage regulating coil 3.

[0018] Implementation examples;

[0019] A three-phase integrated on-load voltage-regulating switch is placed on the side of the transformer body. The lead wiring is consistent with the wiring of the conventional voltage-regulating switch 5. The first and second ends of the voltage-regulating coil 3 are connected to the "+" and "-" terminals of the on-load switch 5. When the transformer is in full-wave state, the voltage difference between the first and second ends of the voltage-regulating coil 3 exceeds the limited voltage of the on-load switch 5. In order to protect the switch and prevent overvoltage, two cables are additionally led out from the first and second ends of the voltage-regulating coil 3 to connect to the lightning arrester 4. Each of the three voltage-regulating coils 3 needs to be connected to a lightning arrester 4. In this way, the voltage regulation of the transformer can be reliably realized through the three-phase integrated on-load switch 5. At the same time, the size of the transformer is reduced, the cost is reduced, the production efficiency is improved, and the error rate in the production process is reduced.

[0020] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A wiring method for a three-phase integrated on-load switch for an autotransformer, wherein a low-voltage coil, a high-voltage coil and a voltage regulating coil are arranged in sequence from the inside to the outside of the transformer, characterized in that: The interior of the voltage-regulating coil is provided with three groups of coil groups connected by voltage-regulating wires, and an on-load switch is fixedly provided on the outer side of the voltage-regulating coil. The on-load switch is an integral switch with three phases. The on-load switch is respectively connected to each group of coil groups through lead wiring. The voltage-regulating coil is connected to the lightning arrester through two cables, and each group of the voltage-regulating coil is connected to the lightning arrester through a lightning protection guide.

2. The wiring method of a three-phase integrated on-load switch for an autotransformer according to claim 1 is characterized in that: The transformer is a body winding type transformer, the transformer has a body inside, the body is in the shape of a cylindrical winding body, and the body is provided with a low voltage coil, a high voltage coil and a voltage regulating coil in sequence from the inside to the outside.

3. The wiring method of a three-phase integrated on-load switch for an autotransformer according to claim 1 is characterized in that: The low-voltage coil and the high-voltage coil are connected and interlaced coils, a ground screen is arranged between the low-voltage coil and the high-voltage coil, a voltage regulating coil is arranged outside the high-voltage coil, and the high-voltage coil and the voltage regulating coil are connected to each other through a wire.

4. The wiring method of a three-phase integrated on-load switch for an autotransformer according to claim 1 is characterized in that: The voltage regulating coil is a winding coil, a lightning arrester is arranged on the top of the voltage regulating coil, cables are arranged on the outer edges of both inner and outer sides of the voltage regulating coil, and the voltage regulating coil is connected to the lightning arrester through two cables on both sides.

5. The wiring method of a three-phase integrated on-load switch for an autotransformer according to claim 1 is characterized in that: The wiring of the on-load switch is consistent with the wiring of a conventional switch and is connected to the voltage regulating coil.

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