CN202797613U - Current transformer wall bushing - Google Patents

Abstract

The utility model discloses a current transformer wall bushing, which forms a cable air tank of a gas-filled cabinet air tank, wherein a bushing, a conductive rod, a current transformer, an upper seal ring and a lower seal ring are arranged in the cable air tank, the upper and the lower seal rings are arranged on the bushing, the upper end and the lower end of the bushing are respectively sealed and fixed on a top air tank wall and a bottom air tank wall of the cable air tank in an insulation mode, the conductive rod is inserted in a center position of the bushing, and the current transformer is sleeved outside the bushing. The current transformer wall bushing for an air insulated switch cabinet can seal a gas-filled cabinet, the current transformer is arranged outside the cable air tank, and the current transformer wall bushing can be flexibly applied for various functions of switch cabinets.

Description

A kind of current transformer wall bushing

Technical field

The utility model relates to the current transformer wall bushing (hereinafter to be referred as sleeve pipe) of a kind of gas insulation switch cabinet (hereinafter to be referred as gas-filling cabinet) usefulness.

Background technology

Existing gas-filling cabinet Current Transformer following dual mode is installed:

1. current transformer is installed in the inside of gas tank, adopt the pedestal current transformer, the shortcoming that adopts this scheme is to consider how Current Transformer Secondary side wire draws gas tank, generally be with instrument transformer as seal, utilize instrument transformer sealing gas tank, secondary is directly drawn gas tank, therefore gas tank must have the opening of increasing, on being sealed with impact, in addition, the office of current transformer itself puts and is difficult to control, and the office that can affect whole gas-filling cabinet puts.

Current transformer is installed in the outside of gas tank, current transformer adopts straight-through current transformer, the wall bushing of current transformer generally adopts the epoxy cast parts or directly uses the stainless steel pipe, in this design, adopt epoxy bushing, the quality problems of epoxy bushing own, as office put, high low temperature etc., adopt the stainless steel pipe, although overcome the part shortcoming of epoxy bushing, can't be for convenience detach.

Therefore need to adopt a kind of detachable stainless steel tube, overcome the problems referred to above.

Summary of the invention

The utility model is in order to solve the installation question of existing current transformer, provide a kind of current transformer wall bushing to be used for gas-filling cabinet external punching current transformer, utilize detachable stainless steel pipe, overcome the problems such as local high low temperature of epoxy bushing, solved again the problem that stainless steel tube can't be dismantled.

A kind of current transformer wall bushing that the utility model provides is characterized in that, forms the cable gas tank of gas-filling cabinet gas tank, is provided with sleeve pipe in it, contact rod, the upper and lower sealing ring of current transformer and sleeve pipe;

Sleeve pipe top and bottom respectively insulated enclosure are fixed on the top gas tank wall and bottom gas tank wall of cable gas tank;

Contact rod inserts in the sleeve pipe center, and current transformer is set on outside the sleeve pipe.

Preferably, described sleeve pipe upper end has a flange, is provided with a seal groove, sealing ring on the interior mounting sleeve of sealing groove on the top gas tank wall of the cable gas tank that contact with the sleeve pipe upper end flange; Clamp nut is installed in the top gas tank wall of cable gas tank by upper sealing ring with sleeve pipe, requires the decrement of sealing ring to reach more than 30%.

Preferably, the clamp nut place increases the sleeve pipe insulation assembly to install, and described sleeve pipe insulation assembly comprises nut collar, insulating washer, insulated tube and flange insulation cushion.

Preferably, the bottom gas tank wall of the cable gas tank that contacts with the sleeve pipe side face is provided with another seal groove, mounting sleeve lower seal in the sealing groove.

Preferably, the tapering of sleeve pipe lower end is 1 °.

Preferably, described sleeve pipe is stainless steel tube.

The utility model current transformer wall bushing structure, the functional effect that can obtain comprises:

1. gas insulation switch cabinet Current Transformer wall bushing of the present utility model (hereinafter to be referred as sleeve pipe), gas-filling cabinet can be sealed, and current transformer is installed in the outside of gas tank, but flexible Application is in the switch cubicle of various functions, for example: line switch cubicle, bus connection switch cabinet etc.

Current transformer wall bushing of the present utility model has adopted the Sealing Technology of " O " RunddichtringO, behind sealing ring in the installation, utilizes tapering stress, automatically finishes the sealing of lower seal.

Description of drawings

Fig. 1 gas-filling cabinet general assembly schematic diagram,

Fig. 2 cable gas tank general assembly schematic diagram,

Fig. 3 current transformer wall bushing sealing of the present utility model assembling schematic diagram,

Fig. 4 current transformer wall bushing insulation of the present utility model assembling schematic diagram,

Fig. 5 sleeve pipe schematic diagram of the present utility model.

Fig. 6 seals stressed schematic diagram.

The primary clustering symbol description:

1 sleeve pipe, 10 (the sleeve pipe upper end) flange, 2 cable gas tanks, 3 contact rods, 4 current transformers, the upper sealing ring of 11 (sleeve pipes), 12(sleeve pipe) lower seal, 21 nut collars, 22 insulating washers, 23 insulated tubes, 24 flange insulation cushions, 25 nuts.

Embodiment

In order at length to understand technical characterictic of the present utility model and practical effect, and can implement according to the content of specification, further with as shown in the figure preferred embodiment, be described in detail as follows:

Shown in Figure 1 is that the utility model middle sleeve is at the assembling schematic diagram of whole gas-filling cabinet.

Fig. 2 is the assembling schematic diagram of cable gas tank in the gas-filling cabinet, a kind of current transformer wall bushing, and the cable gas tank 2 of composition gas-filling cabinet gas tank is provided with sleeve pipe 1, contact rod 3, the upper sealing ring 11 of current transformer 4 and sleeve pipe and lower seal 12 in it; Sleeve pipe top and bottom respectively insulated enclosure are fixed on the top gas tank wall and bottom gas tank wall of cable gas tank 2; Contact rod 3 inserts in sleeve pipe 1 center, and current transformer 4 is set on outside the sleeve pipe 1.

Described sleeve pipe 1 upper end has a flange 10, is provided with a seal groove on the top gas tank wall of the cable gas tank that contacts with sleeve pipe upper end flange 10, sealing ring 11 on the mounting sleeve in the sealing groove; Clamp nut is installed in the top gas tank wall of cable gas tank by upper sealing ring 11 with sleeve pipe 1, and the decrement of sealing ring need reach more than 30% in the requirement.The bottom gas tank wall of the cable gas tank that contacts with sleeve pipe 1 side face is provided with another seal groove, mounting sleeve lower seal 12 in the sealing groove.

During assembling, first lower seal 12 surfaces are coated with the anti-aging grease, lower seal 12 is installed in the seal groove of cable gas tank 2 according to Fig. 3 again, upper sealing ring 11 surfaces are coated with the anti-aging grease, by Fig. 3 upper sealing ring 11 is installed in the seal groove of sleeve pipe 1, current transformer 4 is installed in the cable gas tank 2, insulation assembly 24 is installed between sleeve pipe 1 and the cable gas tank 2, and upper shed place that upper sealing ring 11 and sleeve pipe 1 are inserted gas tank 2 together is by current transformer 4, and insertion under shed, installing insulating assembly 23,22,21, clamp nut, the decrement of sealing ring 11 need reach more than 30% in the requirement.Contact rod 3 is inserted in the sleeve pipe 1, guarantee that contact rod is at the center of outlet-pipe.

Sealing Technology

The design has adopted the Sealing Technology of " O " RunddichtringO, behind sealing ring in the installation 11, utilize tapering stress, automatically finish the sealing of sealing ring 12, principle such as Fig. 6 are in the tapering situation, as add a horizontal force Fn in the tapering horizontal direction, on the tapering surface, this horizontal force Fn can resolve into the power Fx of parallel tapering and the power Fy of vertical tapering.

In conjunction with this sleeve design, when the bolt of the top of mounting sleeve 1, be equivalent to horizontal force Fn of sleeve pipe, the top design of sleeve pipe 1 becomes 1 ° tapering, therefore under the thrust effect, Fn resolves into the power Fx of vertical pipes tapering Fy and parallel tapering, under the effect of power Fy, is 1 ° with sealing ring 12 clamp sleeve top taperings.

Upper and lower sealing ring 11,12 all adopt the EPDM compression molding, to be Shao Shi A 70 ± 5, tensile strength be 〉=10Mpa, elongation after fracture 〉=180%, moulding distortion after the compression, 72 hours to the hardness that the EPDM material requirements is, in the temperature 100 degree situations, be out of shape≤20%, 1008 hours, in the temperature 100 degree situations, distortion≤30% can be used for-30 °～80 ° environment.

Fig. 4 is the insulating mounting schematic diagram of sleeve pipe, need to increase this insulation assembly at the nut place of each sleeve pipe, and the sleeve pipe insulation assembly comprises nut collar 21, insulating washer 22, insulated tube 23 and flange insulation cushion 24.After the installation, can guarantee that magnetic flux does not lose, guarantee the detection of current transformer, the function of protection and metering.Because sleeve pipe 1 outside installed current transformer 4, in contact rod 3, there is electric current to flow through, current transformer will produce induced current at secondary side, finish the functions such as detection to electric current, protection, metering.Because the principle of current transformer is electromagnetic induction principle, therefore magnetic flux does not lose in the time of must guaranteeing current transformer 4 work, but because in this design, stainless steel pipe and cable gas tank might form the loop, cause the loss of magnetic flux, therefore must adopt insulation technology, stainless steel tube and gas tank are cut off.

Above-mentioned only is preferred embodiment of the present utility model; be not that the utility model is done any pro forma restriction; have common knowledge technology personnel in the technical field under any; in the scope that does not break away from the technical characterictic that the utility model lock relates to; part change or modification that the technology contents that utilizes the utility model to disclose has been done all should be encompassed within the protection range of the present utility model.

Claims (7)

1. a current transformer wall bushing is characterized in that, forms the cable gas tank of gas-filling cabinet gas tank, is provided with sleeve pipe in it, contact rod, the upper and lower sealing ring of current transformer and sleeve pipe;

Sleeve pipe top and bottom respectively insulated enclosure are fixed on the top gas tank wall and bottom gas tank wall of cable gas tank;

Contact rod inserts in the sleeve pipe center, and current transformer is set on outside the sleeve pipe.

2. a kind of current transformer wall bushing according to claim 1, it is characterized in that, described sleeve pipe upper end has a flange, is provided with a seal groove, sealing ring on the interior mounting sleeve of sealing groove on the top gas tank wall of the cable gas tank that contact with the sleeve pipe upper end flange; Clamp nut is installed in the top gas tank wall of cable gas tank by upper sealing ring with sleeve pipe, requires the decrement of sealing ring to reach more than 30%.

3. a kind of current transformer wall bushing according to claim 2 is characterized in that, the clamp nut place increases the sleeve pipe insulation assembly to install, and described sleeve pipe insulation assembly comprises nut collar, insulating washer, insulated tube and flange insulation cushion.

4. each described a kind of current transformer wall bushing is characterized in that according to claim 1-3, and the bottom gas tank wall of the cable gas tank that contacts with the sleeve pipe side face is provided with another seal groove, mounting sleeve lower seal in the sealing groove.

5. a kind of current transformer wall bushing according to claim 4 is characterized in that, the tapering of sleeve pipe lower end is 1 °.

6. each described a kind of current transformer wall bushing is characterized in that the tapering of sleeve pipe lower end is 1 ° according to claim 1-3.

7. a kind of current transformer wall bushing according to claim 1 is characterized in that, described sleeve pipe is stainless steel tube.

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