CN116825503A - An electromagnetic voltage transformer body for GIS and its manufacturing method - Google Patents

Abstract

The utility model relates to an electromagnetic voltage transformer body for a GIS and a manufacturing method thereof, and relates to the technical field of transformers. The coil and the high-voltage shielding cover adopt an open structure, so that the structure is more convenient to fix and install besides meeting the shielding effect of a high-voltage electric field of a product; the iron core clamping piece is used for directly replacing a side shielding structure and a bottom shielding structure, so that the integral structure of the electromagnetic voltage transformer body is simplified, and the installation space is saved; the electric potential and the electric field intensity of the end part of the coil with the trapezoid structure are very uniform, enough impulse voltage climbing distance can be provided, the phenomenon that the electromagnetic voltage transformer body generates overlarge current due to insufficient impulse voltage climbing distance is avoided, and the safety requirement of the voltage transformer is ensured.

Description

An electromagnetic voltage transformer body for GIS and its manufacturing method

Technical field

The invention relates to the technical field of transformers, and specifically discloses an electromagnetic voltage transformer body for GIS and a manufacturing method thereof.

Background technique

GIS is a high-voltage switch cabinet composed of seven types of high-voltage electrical appliances: circuit breaker, busbar, isolating switch, voltage transformer, current transformer, arrester, and bushing. It is called fully insulated and fully enclosed metal switchgear. Voltage transformer can convert high voltage in the power grid into low voltage, which is convenient for monitoring and measuring high-voltage equipment. Voltage transformer is a step-down transformer with small capacity, small volume and large voltage ratio. Its basic working principle, structure and connection method They are all the same as transformers. The main difference is that the capacity of voltage transformers is very small, usually only tens to hundreds of volt-amperes.

The utility model patent with the authorization announcement number: CN217768098U discloses an electromagnetic voltage transformer, which includes a bottom shell, an iron core and an adapter seat. An upper shell is installed on the top of the bottom shell, and there is a partition between the bottom shell and the upper shell. plate; the iron core penetrates the partition, the lower part of the iron core is located in the bottom shell, and the upper part of the iron core is located in the upper shell; a top shell is provided on the top of the upper shell, and two of the adapter seats are installed inside the top shell.

The electromagnetic voltage transformer in the disclosed patented technology has a complex body structure and is difficult to assemble, making it unsuitable for GIS; and the coil used has a rectangular structure. The creepage distance of the rectangular structure coil along the winding surface is small. When the power frequency When the voltage creepage is sufficient, the impulse voltage creepage is not enough, which will cause the current in the circuit to be too large, increase the energy consumption of the voltage transformer, and cause a waste of energy. Under normal circumstances, other components in the GIS will work abnormally, thereby affecting the GIS. normal operation; in severe cases, it can easily cause tripping and fire, and cannot meet the safety requirements of voltage transformers.

Contents of the invention

In view of the shortcomings of the current electromagnetic voltage transformer's complex structure and poor safety performance, the present invention provides an electromagnetic voltage transformer body for GIS and a manufacturing method thereof.

In order to achieve the above objects, in the first aspect, the present invention provides the following technical solutions:

An electromagnetic voltage transformer body for GIS, including a base. A first clamp and a second clamp are installed on the base. The first clamp and the second clamp jointly clamp an iron core, and the iron core is surrounded by an insulating cylinder. The outer peripheral wall of the insulating cylinder is covered with a coil, and the outer peripheral wall of the coil is provided with a high-voltage shielding cover. The coil and high-voltage shielding cover of the electromagnetic voltage transformer body adopt an open structure. In addition to meeting the shielding effect on high-voltage electric fields, this structure is more convenient for fixing and installation. By improving the clamp structure of the core, using the first clamp and The second clamp clamps the core inside, so that the original side shielding and bottom shielding structures of the electromagnetic voltage transformer body are merged with the clamp structure. The core clamp is used to directly replace the side shielding and bottom shielding structures, thus simplifying the The overall structure of the electromagnetic voltage transformer body saves installation space.

Preferably, the coil is a trapezoidal structure coil, and the coil is composed of copper wire and diamond film. Each layer of the trapezoidal structure coil decreases step by step, which reduces the requirement for the insulation distance of the inner wall of the iron core and saves raw materials; and the end potential and electric field intensity of the trapezoidal structure coil are very uniform, which can provide sufficient impulse voltage creepage and avoid electromagnetic voltage. The transformer body causes excessive current due to insufficient impulse voltage creepage, which ensures the safety requirements of the voltage transformer.

Preferably, the high-voltage shielding cover includes a first high-voltage collar close to the outer peripheral wall of the coil. A second high-voltage collar is set on the outer peripheral wall of the first high-voltage collar. Ring ears are provided on both sides of the second high-voltage collar. A ferrule close to the outer peripheral wall of the second high-voltage ferrule is provided in the ear. By splitting the high-voltage shielding cover into a first high-voltage collar and a second high-voltage collar and stably fixing them using ferrules, the electromagnetic shielding capability of the high-voltage shielding cover is enhanced and electromagnetic interference is reduced.

Preferably, the ferrule is provided with an opening, and symmetrically arranged snap supports are installed at the opening of the ferrule, and the symmetrically arranged snap supports are fixedly connected together through a bolt structure. The symmetrically arranged snap supports can fasten the ferrule to the outer peripheral wall of the second high-voltage collar under the action of the bolt structure; and the tightness of the ferrule can be adjusted by adjusting the bolt structure connected by the snap supports. The degree of adaptability between the ferrule and the high-voltage shielding cover is improved. By setting the ferrule, the stability of the high-voltage shielding cover can be enhanced to ensure that the high-voltage shielding cover will not loosen or fall off, and the stability of the electromagnetic voltage transformer body during operation is enhanced.

Preferably, a clamping plate is provided between the ferrule and the second high-voltage collar. The clamping plate is fixedly connected to the ferrule through a bolt structure, and both ends of the clamping plate are arranged in the ring ears. The wires in the GIS can be connected to the bolt structure provided in the card board, and the coil is connected to the card board through the wires, thereby realizing interconnection between the coil and the circuit in the GIS.

Preferably, connecting supports are installed on the tops of the first clamp part and the second clamp part, and the connecting supports are fixedly connected to the insulating cylinder. By arranging the connection support, the first clamp and the second clamp can be firmly connected to the insulating cylinder, so that the first clamp, the second clamp and the insulating cylinder form an integral shielding structure, ensuring that the electromagnetic voltage transformer It also fully simplifies the installation structure of the electromagnetic voltage transformer body and reduces the installation volume of the electromagnetic voltage transformer body.

Preferably, the top and bottom of the first clamp are provided with locking bolts for connection, the top locking bolt passes through the gap between the iron core and the insulating cylinder and is fixedly connected to the second clamp, and the bottom locking bolt is provided with Below the iron core and fixedly connected with the second clamp. The first clamp and the second clamp can be fastened together by using locking bolts, ensuring the clamping degree of the iron core and ensuring the stability of the electromagnetic voltage transformer body.

On the other hand, the present invention also provides a method for manufacturing an electromagnetic voltage transformer body for GIS, which includes the following steps:

S1, vacuum anneal the core and impregnate it with epoxy resin, and cast the core and epoxy resin as a whole;

S2, put the copper wire and diamond film into a fully automatic winding machine, and wind it into a trapezoidal structure coil with symmetry on both sides through the automatic winding machine, so that the copper wire, diamond film and copper wire are arranged in layers;

S3, set the coil on the outer peripheral wall of the insulating cylinder, press the first high-voltage collar against the outer peripheral wall of the coil, press the second high-voltage collar against the first high-voltage collar, and place the second high-voltage collar on the outer peripheral wall. Place the clamping plate, place the ferrule above the clamping plate, fasten the clamping plate and the ferrule through the bolt structure, and use the buckle support and bolt structure to fix and lock the ferrule;

S4, set the insulating cylinder on the iron core, use the first clamp and the second clamp to clamp the iron core together, securely connect the first and second clamps to the insulating cylinder through the connecting support, and use the locking bolts Tightly connect the first clamp and the second clamp;

S5, securely install the first clamp and the second clamp on the base, and install the base in the GIS.

It can be seen from the above technical solutions that the present invention has the following advantages:

1. The coil and high-voltage shielding cover of the present invention adopt an open structure. In addition to satisfying the high-voltage electric field shielding function of the product, this structure is more convenient for fixing and installation. By improving the clamp structure of the iron core, the first clamp and the second clamp are used. The iron core is clamped inside, so that the original side shielding and bottom shielding structures of the electromagnetic voltage transformer body are merged with the clamp structure. The iron core clamp is used to directly replace the side shielding and bottom shielding structures, thus simplifying the electromagnetic voltage mutual inductance. The overall structure of the device body saves installation space;

2. In the present invention, the coil is designed as a trapezoidal structure coil, so that the potential and electric field intensity at the end of the coil are very uniform, which can provide sufficient impulse voltage creepage and prevent the electromagnetic voltage transformer body from causing overcurrent due to insufficient impulse voltage creepage. Large phenomenon ensures the safety requirements of the voltage transformer body;

3. The coil of the present invention improves the impact gradient voltage distribution along the coil, can withstand multiple lightning strikes, and effectively improves the lightning impact resistance of the electromagnetic voltage transformer body;

4. By setting the ferrule, the present invention can effectively enhance the stability of the high-voltage shielding cover, ensure that the high-voltage shielding cover will not loosen or fall off, and enhance the stability of the electromagnetic voltage transformer body during operation.

In addition, the invention has a simple design structure, is easy to disassemble and assemble, is safe and reliable, and has very wide application prospects.

Description of the drawings

In order to explain the technical solution of the present invention more clearly, the drawings required for the description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, As far as workers are concerned, other drawings can also be obtained based on these drawings without exerting creative work.

Figure 1 is a schematic diagram of the overall structure of the electromagnetic voltage transformer body according to the specific embodiment of the present invention.

Figure 2 is a schematic diagram of the connection structure of the first clamp and the second clamp according to the specific embodiment of the present invention.

Figure 3 is a schematic diagram of the coil installation structure according to the specific embodiment of the present invention.

Figure 4 is a schematic structural diagram of an insulating cylinder according to a specific embodiment of the present invention.

Figure 5 is an exploded view of the high-voltage shielding cover structure according to the specific embodiment of the present invention.

Figure 6 is a schematic diagram of the core structure of a specific embodiment of the present invention.

Figure 7 is a schematic structural diagram of a connection support according to a specific embodiment of the present invention.

Figure 8 is a cross-sectional view of a coil structure according to a specific embodiment of the present invention.

Figure 9 is an enlarged view of the structure at point A in Figure 8.

In the picture: 1. Base, 2. First clamp, 3. Second clamp, 4. Iron core, 5. Insulating cylinder, 6. Coil, 601. Copper wire, 602. Diamond film, 7. High voltage shielding cover , 701. The first high-voltage collar, 702. The second high-voltage collar, 703. Ring lug, 704. Ferrule, 705. Snap support, 706. Clamp plate, 8. Connection support, 9. Locking bolt .

Detailed ways

In order to make the purpose, features, and advantages of the present invention more obvious and easy to understand, the technical solutions in the present invention will be clearly and completely described below in conjunction with the drawings in this specific embodiment. Obviously, the implementation described below The examples are only some, but not all, of the embodiments of the present invention. Based on the embodiments in this patent, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of this patent.

Please refer to the accompanying drawings 1-9. This specific embodiment provides an electromagnetic voltage transformer body for GIS, including a base 1. A first clamp 2 and a second clamp 3 are installed on the base 1. The first clamp The iron core 4 is sandwiched between the first piece 2 and the second clamping piece 3. The iron core 4 is surrounded by an insulating cylinder 5. The outer peripheral wall of the insulating cylinder 5 is covered with a coil 6, and the outer peripheral wall of the coil 6 is provided with a high-voltage shielding cover 7. The coil 6 and high-voltage shield 7 of the electromagnetic voltage transformer body adopt an open structure. In addition to meeting the high-voltage electric field shielding function of the product, this structure is more convenient for fixing and installation. By improving the clamp structure of the core 4, the first clamp is used Part 2 and the second clamp 3 clamp the core 4 inside, so that the original side shielding and bottom shielding structures of the electromagnetic voltage transformer body are merged with the clamp structure, and the core clamp is used to directly replace the side shielding and bottom shielding. structure, thereby simplifying the overall structure of the electromagnetic voltage transformer body and saving installation space.

Among them, the coil 6 is a trapezoidal structure coil, and the coil 6 is composed of a copper wire 601 and a diamond film 602. Each layer of the trapezoidal structure coil decreases step by step, which reduces the requirement for the insulation distance of the inner wall of the core 4 and saves raw materials; and the potential and electric field intensity at the end of the trapezoidal structure coil are very uniform, which can provide sufficient impulse voltage creepage to avoid electromagnetic type The voltage transformer body causes excessive current due to insufficient impulse voltage creepage, which ensures the safety requirements of the voltage transformer body.

The high-voltage shield 7 includes a first high-voltage collar 701 close to the outer peripheral wall of the coil. A second high-voltage collar 702 is set on the outer peripheral wall of the first high-voltage collar 701. Ring ears are provided on both sides of the second high-voltage collar 702. 703. A ferrule 704 close to the outer peripheral wall of the second high-voltage ferrule 702 is provided in the ear 703. By splitting the high-voltage shielding cover into a first high-voltage collar and a second high-voltage collar and stably fixing them using ferrules, the electromagnetic shielding capability of the high-voltage shielding cover is enhanced and electromagnetic interference is reduced.

The ferrule 704 is provided with an opening, and a symmetrically arranged snap support 705 is installed at the opening of the ferrule 704. The symmetrically arranged snap supports 705 are fixedly connected together through a bolt structure. The symmetrically arranged snap supports 705 can fasten the ferrule 704 on the outer peripheral wall of the second high-voltage collar 702 under the action of the bolt structure connection; and by adjusting the bolt structure connected by the snap supports 705, The nut in the bolt structure rotates internally or externally, so that the tightness of the ferrule 704 can be adjusted, thereby improving the fit between the ferrule 704 and the high-voltage shielding cover 7 . By providing the ferrule 704, the stability of the high-voltage shielding cover 7 can be enhanced to ensure that the high-voltage shielding cover 7 will not loosen or fall off, thereby enhancing the stability of the electromagnetic voltage transformer body during operation.

A clamping plate 706 is provided between the ferrule 704 and the second high-voltage collar 702. The clamping plate 706 is fixedly connected to the ferrule 704 through a bolt structure, and both ends of the clamping plate 706 are arranged in the ring ears 703. The first high-voltage collar 701 and the second high-voltage collar 702 are both provided with through holes. The coil 6 can pass through the first high-voltage collar 701 and the second high-voltage collar 702 and then be connected to the clamping plate 706. The wires in GIS It can be connected to the bolt structure provided in the card plate 706, thereby realizing the interconnection between the coil 6 and the circuit in the GIS.

A connecting support 8 is installed on the top of the first clamp 2 and the second clamp 3, and the connecting support 8 is fixedly connected to the insulating cylinder 5. The connection support 8 is provided with a through hole to facilitate the installation of bolts. The connection support 8 is fixed on the top of the first clamp 2 and the second clamp 3 through bolts. The connection support 8 is also provided with a clamping post to facilitate insertion. The card main body of the connection support 8 can be stuck in the card hole of the insulating cylinder 5, so that the connection support 8 and the insulating cylinder 5 form an integrated structure that is firmly connected. By providing the connection support 8, the first clamp 2 and the second clamp 3 can be firmly connected to the insulating cylinder 5, so that the first clamp 2, the second clamp 3 and the insulating cylinder 5 form an integral shielding structure to ensure It ensures the normal operation of the electromagnetic voltage transformer body; and fully simplifies the installation structure of the electromagnetic voltage transformer body, reducing the installation volume of the electromagnetic voltage transformer body.

The top and bottom of the first clamp 2 are provided with locking bolts 9 for connection. The locking bolt 9 at the top passes through the gap between the core 4 and the insulating cylinder 5 and is fixedly connected to the second clamp 3. The locking bolt 9 at the bottom is fixedly connected to the second clamp 3. The tightening bolt 9 is arranged below the iron core 4 and is fixedly connected with the second clamp 3 . The first clamp 2 and the second clamp 3 can be fastened together by using the locking bolt 9, ensuring the clamping degree of the core 4 and ensuring the stability of the electromagnetic voltage transformer body.

The above describes in detail an embodiment of an electromagnetic voltage transformer body for GIS. Based on the electromagnetic voltage transformer body for GIS described in the above embodiment, embodiments of the present invention also provide an electromagnetic voltage transformer body for GIS. The manufacturing method corresponding to the type voltage transformer body includes the following steps:

S1, perform vacuum annealing on the core 4 and impregnate the epoxy resin, and cast the core 4 and the epoxy resin as a whole; the magnetic circuit of the core 4 produced using this method is coherent, and is consistent with the currently used through-core screw structure laminated cores. Compared with the no-load loss, the no-load loss is reduced by 7%-10%; the no-load current can be reduced by 65%-85%, so that the core 4 has good heat dissipation and thermal shock performance. Due to the small no-load current, the no-load loss is low, and the core's calorific value is also relatively low;

S2, put the copper wire 601 and the diamond film 602 into a fully automatic winding machine, and wind it into a trapezoidal structure coil with symmetry on both sides through the automatic winding machine, so that the copper wire 601 and the diamond film 602 are arranged in layers. ;The thickness of the trapezoidal structure coil is 65% lower than that of the rectangular structure coil, and the error performance is 25%-30% higher than that of the rectangular structure coil;

S3, set the coil 6 on the outer peripheral wall of the insulating cylinder 5, press the first high-voltage collar 701 against the outer peripheral wall of the coil 6, press the second high-voltage collar 702 against the first high-voltage collar 701, and press the second high-voltage collar 701 against the first high-voltage collar 701. A clamping plate 706 is placed on the outer peripheral wall of the collar 702, and a ferrule 704 is placed above the clamping plate 706. The clamping plate 706 and the ferrule 704 are fastened through the bolt structure, and the ferrule 704 is fixed and locked using the snap support 705 and the bolt structure. die;

S4, set the insulating cylinder 5 on the iron core 4, use the first clamp 2 and the second clamp 3 to jointly clamp the iron core 4, and connect the first clamp 2 and the second clamp 3 with the insulation through the connecting support 8 The cylinder 5 is fixedly connected, and the first clamp 2 and the second clamp 3 are tightly connected using locking bolts 9;

S5, securely install the first clamp 2 and the second clamp 3 on the base 1, and install the base 1 in the GIS.

The present invention redesigns the body of the voltage transformer for GIS, simplifies the structure and reduces the volume on the basis of meeting the insulation distance requirements, thereby reducing the impact of the body on the outer diameter of the entire electromagnetic voltage transformer body product for GIS. The impact can not only reduce the cost of the product, but also reduce the difficulty of assembly and improve assembly efficiency.

The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be practiced in other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (8)

1. An electromagnetic voltage transformer body for GIS, including a base (1). It is characterized in that a first clamp (2) and a second clamp (3) are installed on the base (1). The first clamp The iron core (4) is sandwiched between the piece (2) and the second clamping piece (3). The iron core (4) is surrounded by an insulating cylinder (5), and the outer peripheral wall of the insulating cylinder (5) is covered with a coil (6). A high-voltage shielding cover (7) is provided on the outer peripheral wall of the coil (6). 2. An electromagnetic voltage transformer body for GIS according to claim 1, characterized in that the coil (6) is a trapezoidal structure coil, and the coil (6) is composed of copper wire (601) and diamond film (602). )composition. 3. An electromagnetic voltage transformer body for GIS according to claim 1, characterized in that the high-voltage shielding cover (7) includes a first high-voltage collar (701) close to the outer peripheral wall of the coil. A second high-voltage collar (702) is set on the outer peripheral wall of the collar (701). Ring lugs (703) are provided on both sides of the second high-voltage collar (702). The ring lugs (703) are provided with a second high-voltage collar (702). The ferrule (704) of the outer peripheral wall of the two high-voltage ferrules (702). 4. An electromagnetic voltage transformer body for GIS according to claim 3, characterized in that the ferrule (704) is provided with an opening, and symmetrically arranged buckle supports are installed at the opening of the ferrule (704). The symmetrically arranged buckle supports (705) are fixedly connected together through a bolt structure. 5. An electromagnetic voltage transformer body for GIS according to claim 3, characterized in that a clamping plate (706) is provided between the ferrule (704) and the second high-voltage ferrule (702). The plate (706) is fixedly connected to the ferrule (704) through a bolt structure, and both ends of the clamping plate (706) are arranged in the ring ears (703). 6. An electromagnetic voltage transformer body for GIS according to claim 1, characterized in that connecting supports (8) are installed on the tops of the first clamp (2) and the second clamp (3). , the connecting support (8) is fixedly connected to the insulating cylinder (5). 7. An electromagnetic voltage transformer body for GIS according to claim 1, characterized in that the top and bottom of the first clamp (2) are provided with locking bolts (9) for connection. The locking bolt (9) passes through the gap between the iron core (4) and the insulating cylinder (5) and is fixedly connected to the second clamp (3). The bottom locking bolt (9) is arranged below the iron core (4). And fixedly connected with the second clamp (3). 8. A method for manufacturing an electromagnetic voltage transformer body for GIS according to any one of claims 1-7, characterized in that it includes the following steps: S1, perform vacuum annealing and impregnation of the iron core (4) with epoxy resin, and cast the iron core (4) and the epoxy resin as a whole; S2, put the copper wire (601) and diamond film (602) into a fully automatic winding machine, and wind it into a trapezoidal structure coil with symmetry on both sides through the fully automatic winding machine, so that the copper wire (601) and diamond film The films (602) are arranged in layers; S3, set the coil (6) on the outer peripheral wall of the insulating cylinder (5), press the first high-voltage collar (701) close to the outer peripheral wall of the coil (6), and press the second high-voltage collar (702) tightly A clamping plate (706) is placed on the outer peripheral wall of the first high-voltage collar (701) and the second high-voltage collar (702). A ferrule (704) is placed above the clamping plate (706). The clamping plate (706) is connected through a bolt structure. Fasten it to the ferrule (704), and use the buckle support (705) and bolt structure to fix and lock the ferrule (704); S4, set the insulating cylinder (5) on the iron core (4), use the first clamp (2) and the second clamp (3) to clamp the iron core (4), and connect the third clamp (8) to the iron core (4). The first clamp (2) and the second clamp (3) are fixedly connected to the insulating cylinder (5), and the first clamp (2) and the second clamp (3) are tightly connected using locking bolts (9). Tighten the nuts at both ends of the locking bolt (9) and tighten the locking bolt (9); S5, fix the first clamp (2) and the second clamp (3) on the base (1), and install the base (1) in the GIS.