Novel current transformer structure

Abstract

The utility model belongs to the technical field of GIS (Gas Insulated Switchgear), and particularly discloses a novel current transformer structure which comprises a flange shell, the flange shell extends along the vertical direction, a shielding cylinder is arranged at the bottom of the flange shell, and basin-type insulators are arranged at the top of the flange shell and the bottom of the shielding cylinder. According to the utility model, the basin-type insulators are respectively arranged at the top of the flange shell and the bottom of the shielding cylinder, so that an independent air chamber is established, the air pressure between the two sides of the air chamber can be reduced, and the current transformer can be independently overhauled; when the current transformer breaks down, the gas of the current transformer can be independently recovered and the current transformer can be disassembled and repaired by reducing the pressure on the two sides of the independent gas chamber, and the problems that the gas of a current transformer with a non-independent gas chamber needs to be recovered at intervals, the operation is inconvenient, the repeated inflation efficiency is low after the gas is recovered, and the gas utilization rate is low are solved. The larger the air chamber is, the more the loss is.

Description

Technical Field

[0001] The utility model belongs to the technical field of GIS, and in particular relates to a novel current transformer structure. Background Art

[0002] A current transformer is a key device in power systems. Its function is to convert high currents in AC circuits into proportionally smaller currents for measurement and relay protection. It is widely used in power systems for measurement, relay protection, and metering and billing.

[0003] When the current transformer is in use, it often shares the same gas chamber with other GIS modules. When repairing the current transformer or other modules, it is impossible to return the gas to the system for repair.

[0004] In addition, at the ultra-high voltage level (above 550kV voltage), the product gas chamber is large, the gas recovery time is long, and the recovered gas is difficult to store, which will cause waste of resources;

[0005] Furthermore, to ensure product reliability, current transformers usually have a straight-cylinder rain cover installed on the outside of the coil. During transportation and assembly, deformation may occur due to human operation or material stress intensity, and there is a high risk of material cracking, which will affect the quality of the current transformer. Utility Model Content

[0006] The utility model provides a new current transformer structure, which is designed to meet the needs of an independent air chamber of a product and to improve the bending and tensile strength of a rain cover, and can meet the transportation conditions of most products.

[0007] The technical problem to be solved by the present invention is achieved by adopting the following technical solutions:

[0008] A novel current transformer structure includes a flange housing extending in a vertical direction and having a shielding cylinder at its bottom. Basin insulators are installed on the top of the flange housing and the bottom of the shielding cylinder. A rain shield is sleeved on the outside of the flange housing.

[0009] The rain cover is divided into a straight section and a corrugated section along the vertical direction. The corrugated section is connected to the straight section. The bottom of the corrugated section is connected to the shielding tube, and the straight section is connected to the flange shell.

[0010] With the above solution, pot-type insulators are installed on the top of the flange housing and the bottom of the shielding tube respectively. The purpose is to establish an independent air chamber. This independent air chamber is formed by isolating the current transformer and the external GIS module from the common air chamber. The air pressure between the two sides of the air chamber can be reduced, so that the current transformer can be repaired separately.

[0011] When a current transformer fails, the pressure on both sides of the independent gas chamber can be reduced to recover the current transformer gas separately and the current transformer can be disassembled and repaired. There is no need to recover the gas at intervals like the current transformer with a non-independent gas chamber, which is inconvenient to operate. The efficiency of repeated inflation after gas recovery is low, and the gas utilization rate is low, that is, there will be gas loss during inflation and deflation, and the larger the gas chamber, the greater the loss.

[0012] Preferably, the pot insulator has a pot insulator chamber inside, the flange shell has a flange shell chamber inside, and the shielding tube has a shielding tube chamber inside. The pot insulator chamber, the flange shell chamber, the shielding tube chamber and another pot insulator chamber are equipped with conductors together, and the conductors are electrically connected to the conductors on the two pot insulators.

[0013] It should be noted that the conductor passes through the basin insulator chamber, the flange shell chamber, the shielding tube chamber and another basin insulator chamber in sequence from bottom to top in the vertical direction. In addition, the basin insulator chamber, the flange shell chamber, the shielding tube chamber and another basin insulator chamber are respectively blocked and not connected, that is, the basin insulator chamber is an independent chamber.

[0014] Preferably, the external fixed sleeve of the flange shell is provided with a circular connecting ring, and the top edge of the straight tube section is connected to the circular connecting ring by bolts; a first flange is installed on the top of the shielding tube, and a second flange is installed on the bottom of the corrugated section, and the first flange and the second flange are connected by bolts.

[0015] Furthermore, before the first flange and the second flange are connected by bolts, an O-ring is set on the first flange. After the two flanges are connected by bolts, the O-ring is compacted and the inner cavities of the two flanges are connected to the O-holes on the O-ring.

[0016] With the above solution, a sealing structure in which an O-ring and bolts are connected is used between the two flanges to enhance the waterproof capability of the product.

[0017] Preferably, the acute angle formed by the intersection of the outwardly protruding surface of the corrugated segment and the horizontal surface is 30-60°.

[0018] The above solution is adopted in order to enable the product to absorb the tensile potential energy during transportation or assembly.

[0019] Preferably, the number of the corrugated segments is 2-3.

[0020] The purpose of adopting the above solution is to absorb potential energy and ensure the stability of the product during transportation and assembly.

[0021] Preferably, a curved bracket is welded inside the straight section along its circumference, and the top of the curved bracket is connected to the top of the straight section, and the bottom of the curved bracket is connected to the top of the side wall of the straight section.

[0022] The above solution is adopted to ensure the upper support of the protective cover and prevent deformation.

[0023] Preferably, the curved bracket is an arc-shaped bracket.

[0024] Furthermore, the arc bending angle set on the arc-shaped bracket is 45°.

[0025] The above solution is adopted to meet product requirements.

[0026] The beneficial effects of the utility model are:

[0027] (1) The utility model installs pot-type insulators on the top of the flange shell and the bottom of the shielding tube respectively, in order to establish an independent gas chamber, that is, the independent gas chamber is formed by isolating the common gas chamber of the current transformer and the external GIS module, which can reduce the air pressure between the two sides of the gas chamber, so that the current transformer can be repaired separately; when the current transformer fails, the pressure on both sides of the independent gas chamber can be reduced, and the current transformer can be disassembled and repaired. There is no need to recover the gas at intervals like the current transformer with a non-independent gas chamber, which is inconvenient to operate. After the gas is recovered, the efficiency of repeated inflation is low, and the gas utilization rate is low, that is, there will be gas loss during inflation and deflation, and the larger the gas chamber, the greater the loss;

[0028] (2) The protective cover in the present invention adopts a straight section and a corrugated section. The corrugated section has good ductility and can meet the tensile assembly requirements of the product, preventing the material from being significantly deformed or cracked due to excessive manual operating torque, thereby affecting product quality;

[0029] (3) A curved bracket is also provided at the top of the protective cover in the present invention, and the curved bracket can improve the support reliability inside the protective cover, thereby improving product quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a front view of the utility model;

[0031] Figure 2 It is a cross-sectional view of the utility model;

[0032] Figure 3 This is a schematic diagram of the structure of the bent bracket inside the protective cover of the utility model;

[0033] Figure 4 This is a cross-sectional view of the labyrinth-type breathing valve in the present invention installed on the protective cover;

[0034] Figure 5 This is a schematic diagram of the structure of the labyrinth breathing valve in the present utility model;

[0035] Figure 6 This is a schematic structural diagram of the shielding tube, protective cover and O-ring in the utility model;

[0036] In the figure: basin insulator 1; basin insulator chamber 101; flange shell 2; flange shell chamber 201; conductor 3; inflation valve seat 4; protective cover 5; straight tube section 501; corrugated section 502; second flange 5021; shielding tube 6; shielding tube chamber 601; density meter 7; adsorbent cover 8; labyrinth breathing valve 9; junction box 10; circular connecting ring 11; first flange 12; sealing ring 13; curved bracket 14. DETAILED DESCRIPTION

[0037] In order to make the technical means, creative features, objectives and effects of the present invention easier to understand, the present invention is further described below with reference to specific illustrations.

[0038] like Figure 1-6 As shown, a new current transformer structure includes a flange housing 2, which extends in a vertical direction and has a shielding tube 6 at its bottom. The top of the flange housing 2 and the bottom of the shielding tube 6 are both installed with a pot-type insulator 1; the outside of the flange housing 2 is sleeved with a rain cover 5;

[0039] The rain cover 5 is divided into a straight section 501 and a corrugated section 502 along the vertical direction. The corrugated section 501 and the straight section 52 are connected. The bottom of the corrugated section 502 is connected to the shielding tube 6, and the straight section 501 is connected to the flange shell 2.

[0040] The pot insulator 1 has a pot insulator chamber 101 inside, the flange shell 2 has a flange shell chamber 201 inside, and the shielding tube 6 has a shielding tube chamber 601 inside. The pot insulator chamber 101, the flange shell chamber 201, the shielding tube chamber 601 and another pot insulator chamber 101 are connected in sequence, and the pot insulator chamber 101, the flange shell chamber 201, the shielding tube chamber 601 and another pot insulator chamber 101 are jointly installed with the conductor 3, and the conductor 3 is electrically connected to the conductors on the two pot insulators 1.

[0041] A circular connecting ring 11 is fixedly sleeved on the outside of the flange shell 2, and the top edge of the straight tube section 501 is connected to the circular connecting ring 11 by bolts; the inside of the straight tube section 501 is welded with a curved bracket 14 with a circular arc bending angle of 45° along its circumference, and the top of the curved bracket 14 is connected to the top of the straight tube section 501, and the bottom of the curved bracket 14 is connected to the top of the side wall of the straight tube section 501. The purpose is to ensure the upper support of the protective cover 5 and prevent deformation. In order to achieve the best support effect, a 45-degree arc-shaped bracket is selected; the first flange 12 is installed on the top of the shielding tube 6, and the second flange 5021 is installed on the bottom of the corrugated section 502. The first flange 12 and the second flange 5021 are connected by bolts. Specifically, before the first flange 12 and the second flange 5021 are connected by bolts, an O-ring 13 is set on the first flange 12. After the two flanges are connected by bolts, the O-ring 13 is compacted and the inner cavities of the two flanges are connected to the O-holes on the O-ring 13.

[0042] With the above solution, a sealing structure in which an O-ring 13 is connected to bolts is used between the two flanges to enhance the waterproof capability of the product.

[0043] The acute angle formed by the intersection of the outward protruding surface of the corrugated section and the horizontal surface is 30-60°, the purpose of which is to allow the product to absorb the tensile potential energy during transportation or assembly; the number of corrugated sections is 2-3, the purpose of which is to absorb potential energy and ensure the stability of the product during transportation and assembly.

[0044] An inflation valve seat 4, a density meter interface and a flange interface are respectively installed along the side walls of the flange shell 2. The inflation valve seat 4, the density meter interface and the flange interface are all connected to the flange shell chamber 201. The inflation valve seat 4 can inflate the flange shell chamber 201 on the flange shell 2. An adsorbent cover plate 8 is installed on the flange interface to adsorb the product decomposition products inside the flange shell chamber 201. In addition, through the flange interface, the efficiency of conductor assembly in the factory can be improved and the production capacity can be increased. The density meter interface is installed with a density meter 7; the pressure of the flange shell chamber 201 can be observed.

[0045] A labyrinth breathing valve 9 is installed on the outside of the protective cover 5, and one end of the labyrinth breathing valve 9 passes through and extends into the interior of the flange shell 2. Specifically, the structure of the labyrinth breathing valve 9 is L-shaped, and the vertical end of the L-shaped labyrinth breathing valve is vertically downward; the purpose is to ensure that the product is protected from the influence of wind, sand or rain on the product air chamber during use. The labyrinth breathing valve 9 structure can better adjust the internal air pressure and maintain the balance of internal and external pressures, thereby protecting the equipment from changes in the external environment. In addition, 10μm sieve sheets are respectively arranged inside the two ends of the L-shaped labyrinth breathing valve to filter out most foreign matter and ensure product reliability.

[0046] It should be noted that a junction box 10 is installed on the side wall of the protective cover 5 , and the junction box 10 is used to meet the demand for wires to be output from the coil on the flange housing 2 .

[0047] It should be noted that the installation sequence of this current transformer is as follows:

[0048] First, install the shielding tube 6 on the flange shell 2, and then install the protective cover 5 on the flange shell 2. Since a circular connecting ring 11 is provided on the flange shell 2, the protective cover 5 is inserted into the flange shell 2 from bottom to top in the vertical direction, and the upper end of the flange shell 2 extends to the outside of the protective cover 5 in the vertical direction. Then install the junction box 10 on the protective cover 5, and then install the two pot-type insulators 1 on the top of the flange shell 2 and the bottom of the shielding tube 6. Then install the inflation valve seat 4, the density meter 7 (it should be noted that the angle between the density meter 7 and the flange shell 2 in the vertical direction is 45°), and the adsorbent cover 8 on the flange shell 2, and the labyrinth breathing valve 9 is installed on the protective cover 5 to complete the entire assembly.

[0049] The above shows and describes the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments and that various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and improvements are intended to fall within the scope of the present invention. The scope of protection claimed in this invention is defined by the appended claims and their equivalents.

Claims

1. A novel current transformer structure, comprising a flange housing extending in a vertical direction, characterized in that: The bottom of the flange housing is provided with a shielding cylinder, and the top of the flange housing and the bottom of the shielding cylinder are both equipped with pot-type insulators; the outside of the flange housing is sleeved with a rain cover; The rain cover is divided into a straight section and a corrugated section along the vertical direction. The corrugated section is connected to the straight section. The bottom of the corrugated section is connected to the shielding tube, and the straight section is connected to the flange shell.

2. A new current transformer structure according to claim 1, characterized in that: The pot insulator has a pot insulator chamber inside, the flange shell has a flange shell chamber inside, and the shielding tube has a shielding tube chamber inside. The pot insulator chamber, the flange shell chamber, the shielding tube chamber and another pot insulator chamber are jointly equipped with a conductor, and the conductor is electrically connected to the conductors on the two pot insulators.

3. A new current transformer structure according to claim 1, characterized in that: A circular connecting ring is fixedly sleeved on the outside of the flange shell, and the top edge of the straight tube section is connected to the circular connecting ring by bolts; a first flange is installed on the top of the shielding tube, and a second flange is installed on the bottom of the corrugated section, and the first flange and the second flange are connected by bolts.

4. A new current transformer structure according to claim 1, characterized in that: The acute angle formed by the intersection of the outwardly protruding surface of the corrugated section and the horizontal surface is 30-60 degrees.

5. The novel current transformer structure according to claim 1, characterized in that: The number of the corrugated segments is 2-3.

6. A new current transformer structure according to claim 1, characterized in that: A curved bracket is welded inside the straight section along its circumference, and the top of the curved bracket is connected to the top of the straight section, and the bottom of the curved bracket is connected to the top of the side wall of the straight section.

7. A new current transformer structure according to claim 6, characterized in that: The curved bracket is an arc-shaped bracket.

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