CN102360895B - Current transformer for gas-insulated metal-enclosed switchgear - Google Patents

Abstract

The invention discloses a current transformer for gas-insulated metal-enclosed switchgear, which comprises an inner shielding flange, a winding coil, a connecting flange and a cylindrical plate spinning part; the cylindrical plate spinning part is fixed on the inner shielding flange, Between the connecting flange and the inner shielding flange, the connecting flange and the cylindrical plate spinning part, a closed cavity is formed, and the winding coil is accommodated in the closed cavity, which can effectively prevent rainwater from entering the transformer; The grounding system between the inner shielding flange and the connecting flange adopts a built-in structure, which avoids the long-term corrosion of the jumper grounding plate exposed to rainwater, makes the appearance of the current transformer more beautiful, and the retractable grounding plate can absorb the operating time of the product. The deformation of the grounding plate due to thermal expansion and contraction; the invention ensures the reliability of the product, has a very simple structure, and is common for indoor and outdoor products, and the manufacturing cost is obviously reduced.

Description

A current transformer for gas-insulated metal-enclosed switchgear

technical field

The invention relates to a component for a gas-insulated metal-enclosed switchgear, which is a current transformer used for incoming and outgoing lines in a tank circuit breaker and a gas-insulated metal-enclosed switchgear (GIS), especially a 420kV/550kV GIS incoming and outgoing current transformers for the line.

Background technique

The current transformer used in the incoming and outgoing lines of high-voltage switchgear is a commonly used component in tank circuit breakers and gas-insulated metal-enclosed switchgear (GIS). Its function is to measure and protect high-voltage switchgear through this component.

In the past, the current transformer design of high-voltage switchgear mainly has two structural forms: one is the built-in type, the inner shielding cylinder is a welded structure, and the transformer coil installed on the cylinder wall is connected by flange bolts; The other is the external type, the inner shielding cylinder is a casting structure, and the winding coil and the inner shielding flange are connected by integral casting; the outdoor products of the above two types of current transformers all adopt a rainproof cover structure, Water accumulation is more likely to occur, sealing measures are difficult to implement, and the current transformer has water ingress; the product grounding plate is an external bridging structure, and the material consumption is large, and it is easily corroded by rainwater if it is exposed for a long time, and it will greatly affect the high-voltage switchgear. The overall appearance is beautiful.

Contents of the invention

The purpose of the present invention is to provide a current transformer for gas-insulated metal-enclosed switchgear, which is well sealed and can effectively prevent rainwater from entering the transformer to corrode the winding coil and affect the performance of the current transformer.

In order to achieve the above object, the present invention adopts the following technical solutions:

A current transformer for gas-insulated metal-enclosed switchgear, comprising an inner shielding flange, a winding coil, a connecting flange, and a cylindrical plate spinning part; the cylindrical plate spinning part is fixed to the inner shielding flange and the connecting flange Between the inner shielding flange, the connecting flange and the cylindrical plate spinning parts, a closed cavity is formed, and the winding coil is accommodated in the closed cavity; the upper flange surface of the inner shielding flange is provided with an angled The slope structure forms a rainproof edge, and the lower part of the rainproof edge is provided with a sealing groove. The upper end of the cylindrical plate spinning part is inserted into the sealing groove, and the lower end is fixed on the outer periphery of the connecting flange; the lower end of the inner shielding flange and the upper end of the connecting flange Connected by loose block crimping.

The further improvement of the present invention lies in that a waterproof layer is provided at the connection between the cylindrical plate spinning part and the inner shielding flange and the connecting flange.

The further improvement of the present invention is that: the lower end of the inner shielding flange and the upper end of the connecting flange are crimped through three arc-shaped flange loose blocks, and the three arc-shaped flange loose blocks are arranged in a triangle.

The further improvement of the present invention is: a grounding plate is accommodated in the airtight cavity formed between the inner shielding flange, the connecting flange and the cylindrical plate spinning part, and the top and bottom of the grounding plate are respectively connected with the inner shielding flange and the connecting flange .

The further improvement of the present invention is that: the top and the bottom of the grounding plate are respectively connected to the inner shielding flange and the connecting flange through bolts.

The further improvement of the present invention is that: a set of bent structures for absorbing deformation is provided on the ground plate.

The further improvement of the present invention is that: the upper flange surface of the inner shielding flange is provided with an angled slope structure.

The present invention is a current transformer for gas-insulated metal-enclosed switchgear, which includes an inner shielding flange and a connecting flange with a central conductor; the winding coil of the current transformer and the inner shielding flange are connected by integral casting. ;The upper end of the inner shielding flange is provided with a rain-proof edge, and the closed structure composed of the inner shielding flange, cylindrical plate spinning parts and connecting flanges forms a reliable strong waterproof system, and all external joints are coated with special Waterproof material; the lower end of the inner shielding flange and the upper end of the connecting flange are connected by loose block crimping, which can be rotated at any angle to adjust design and assembly errors; the grounding system between the inner shielding flange and the connecting flange of the current transformer adopts The built-in structure prevents the exposed jumper grounding plate from being corroded by rainwater for a long time, the appearance design is more beautiful, and it is common for indoor and outdoor products.

In the above solution, the strong waterproof system includes an inner shielding flange, a cylindrical plate spinning part and a connecting flange, the upper end of the inner shielding flange is provided with a rainproof edge and a sealing groove, and the upper part of the cylindrical plate spinning part passes Plug-in and sealed groove connection, the lower part is fixed with the connecting flange by bolts, and all external joints are coated with special waterproof materials.

The loose block crimping method is realized by fixing the inner shielding flange and the connecting flange through three arc-shaped flange loose blocks using a bolt connection method. According to the inherent characteristics of the triangle, the structure is stable and reliable, and the product is assembled. The angle can also be adjusted moderately, which can fully adjust the errors of preliminary design and on-site assembly.

The built-in grounding system includes an inner shielding flange, a retractable grounding plate and a connecting flange, and the inner side of the retractable grounding plate and the inner shielding flange and the connecting flange are connected by bolts to meet the flow requirements of the grounding loop system. And it is hidden inside the cylindrical plate spinning part, and the grounding plate cannot be seen outside the product.

The flange surface at the upper end of the inner shielding flange is designed with an angled slope structure, which can quickly divert the accumulated water above the current transformer during field operation of outdoor products, and avoid the possibility of rainwater penetrating into the current transformer.

The retractable grounding plate is designed with a group of curved structures on the grounding plate, which can absorb the deformation of the grounding plate due to thermal expansion and contraction when the product is running.

Compared with the prior art, the present invention has the following advantages: a current transformer for gas-insulated metal-enclosed switchgear of the present invention forms a closed cavity between the inner shielding flange, the connecting flange and the cylindrical plate spinning part, and the coil The winding is sealed in the airtight cavity, and the connection between the cylindrical plate spinning part and the inner shielding flange and connecting flange is provided with a waterproof layer, which can effectively prevent rainwater from entering the inside of the transformer; the inner shielding flange and connecting flange of the current transformer The grounding system between them adopts a built-in structure to avoid the long-term corrosion of the jumper grounding plate exposed to rainwater, making the appearance of the current transformer more beautiful, and the retractable grounding plate can absorb the thermal expansion and contraction of the product during operation. The grounding plate is deformed; the invention has simple structural design, easy manufacture, convenient product assembly, high safety and reliability, greatly reduced number of parts and very good economy.

Description of drawings

Fig. 1 is a schematic structural diagram of a current transformer of the present invention.

Fig. 2 is a schematic structural diagram of the waterproof system in Fig. 1 .

Fig. 3 is a schematic structural diagram of the connection system in Fig. 1 .

FIG. 4 is a schematic structural diagram of the grounding system in FIG. 1 .

Detailed ways

The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

As shown in Fig. 1, a kind of current transformer for gas-insulated metal-enclosed switchgear of the present invention comprises inner shielding flange 2 and connecting flange 6 with central conductor 1; winding coil 4 of current transformer and inner shielding method The flanges 2 are connected by integral casting; the upper end of the inner shielding flange 2 is provided with a rainproof edge 3, which is a closed structure composed of the inner shielding flange 2, the cylindrical plate spinning part 9 and the connecting flange 6 To form a reliable strong waterproof system, all external joints are coated with waterproof materials to form a waterproof layer 7; the lower end of the inner shielding flange 2 and the upper end of the connecting flange 6 are connected by crimping through the arc-shaped flange block 5 , can be rotated at any angle to adjust design and assembly errors; the grounding system between the inner shielding flange 2 and the connecting flange 6 of the current transformer adopts a built-in structure to avoid long-term corrosion of the jumper grounding plate exposed to rainwater. The design is more beautiful, and it is universal for indoor and outdoor products.

As shown in Figures 1 and 2, the strong waterproof system includes an inner shielding flange 2, a cylindrical plate spinning part 9 and a connecting flange 6, and the upper end of the inner shielding flange 2 is provided with a rainproof edge 3 and a sealing groove 30. The upper part of the cylindrical plate spinning part 9 is connected to the sealing groove 30 by inserting, the lower part is fixed to the connecting flange 6 by bolts 10, and all external joints are coated with waterproof materials to form a waterproof layer 7; The upper flange surface of the shielding flange 2 is designed with an angled slope structure, which can quickly divert the accumulated water above the current transformer when the outdoor product is running on site, and avoid the possibility of rainwater penetrating into the current transformer.

As shown in Figure 3, the loose block crimping method is realized by fixing the inner shielding flange 2 and the connecting flange 6 through three arc-shaped flange loose blocks 5 using bolt connection. According to the inherent characteristics of the triangle, This makes the structure stable and reliable, and the angle can be adjusted moderately during product assembly, which can fully adjust the errors of preliminary design and on-site assembly.

As shown in Figure 4, the built-in grounding system includes an inner shielding flange 2, a retractable grounding plate 8 and a connecting flange 6, and the retractable grounding plate 8 passes through the inside of the inner shielding flange 2 and the connecting flange 6 Bolt connection is used to realize the flow requirements of the grounding loop system, and it is hidden inside the cylindrical plate spinning part 9, and the grounding plate cannot be seen outside the product; the scalable grounding plate 8 is designed with a set of curved shapes on the grounding The structure 80 can absorb the deformation of the grounding plate due to thermal expansion and contraction when the product is in operation.

Claims (6)

1. a current transformer of gas insulated metal sealing switchgear is characterized in that, comprises inner shield flange, winding coil, adpting flange and cylindrical sheet material spinning spare; Cylindrical sheet material spinning spare is fixed between inner shield flange and the adpting flange, forms closed chamber between inner shield flange, adpting flange and cylindrical sheet material spinning spare, and described winding coil is contained in the described closed chamber; The ramp structure that described inner shield flange upper flanges face is provided with the band angle forms rainproof edge, rainproofly is provided with seal groove along the bottom, and insert in the described seal groove cylindrical sheet material spinning spare upper end, and the adpting flange periphery is fixed in the lower end; Inner shield flange lower end links to each other by loose piece crimping mode with the upper end of adpting flange.

2. a kind of current transformer of gas insulated metal sealing switchgear according to claim 1 is characterized in that, cylindrical sheet material spinning spare is equipped with watertight composition with inner shield flange and adpting flange junction.

3. a kind of current transformer of gas insulated metal sealing switchgear according to claim 1, it is characterized in that, the upper end of inner shield flange lower end and adpting flange is by the crimping of three arc flange loose pieces, these three triangular in shape arranging of arc flange loose piece.

4. a kind of current transformer of gas insulated metal sealing switchgear according to claim 1, it is characterized in that, contain ground plate in the closed chamber that forms between inner shield flange, adpting flange and cylindrical sheet material spinning spare, this ground plate top is connected with adpting flange with the inner shield flange respectively with the bottom.

5. a kind of current transformer of gas insulated metal sealing switchgear according to claim 4 is characterized in that, the ground plate top is connected with adpting flange with the inner shield flange respectively by bolt with the bottom.

6. a kind of current transformer of gas insulated metal sealing switchgear according to claim 4 is characterized in that, ground plate is provided with one group of bending structure that absorbs distortion.

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