CN209844394U - SF6 gas casing outlet structure - Google Patents

SF6 gas casing outlet structure Download PDF

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Publication number
CN209844394U
CN209844394U CN201920798755.9U CN201920798755U CN209844394U CN 209844394 U CN209844394 U CN 209844394U CN 201920798755 U CN201920798755 U CN 201920798755U CN 209844394 U CN209844394 U CN 209844394U
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China
Prior art keywords
sleeve
gas
gas sleeve
conductor
outgoing line
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CN201920798755.9U
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Chinese (zh)
Inventor
吴小虎
周健
苏太郎
贾伦
时磊
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CHINA CHUAN KAI ELECTRIC Co Ltd
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CHINA CHUAN KAI ELECTRIC Co Ltd
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Abstract

The utility model relates to the technical field of conductive connecting devices, and discloses an SF6 gas sleeve outgoing line structure, which comprises a gas sleeve outgoing line structure, wherein the gas sleeve outgoing line structure comprises a gas sleeve and an overhead line, one end of the gas sleeve is provided with a transition cylinder, and one side of the transition cylinder is provided with a connecting cylinder; the connecting cylinder is internally provided with a plum blossom contact, the other end of the gas sleeve is provided with a sleeve conductor which is inserted into the gas sleeve and penetrates through the transition cylinder to be connected with the plum blossom contact in the connecting cylinder, and the sleeve conductor outside the gas sleeve is connected with an overhead line. The utility model discloses can realize being convenient for to GIS and main maintenance, experimental purpose separately that become, mainly used GIS oil gas sheathed tube transformation engineering. By reliably connecting the SF6 gas sleeve and the overhead steel-cored aluminum strand with the transformer, the reliable isolation between the GIS and the main transformer can be realized only by detaching the overhead line during maintenance, thereby avoiding the problem that the GIS and the main transformer cannot be maintained and tested independently and being more favorable for independently maintaining and testing the GIS and the main transformer.

Description

SF6 gas casing outlet structure
Technical Field
The utility model relates to a conductive connection technical field specifically indicates a SF6 gas casing goes out line structure (mainly used GIS oil gas casing transformation).
Background
With the vigorous popularization and application of the GIS in the power system, the reliable connection between the 126kV gas insulated metal enclosed switchgear GIS and the transformer and the maintenance and overhaul become increasingly important. In the prior art, the connection between the GIS and the transformer is realized through an oil-gas casing pipe. However, the GIS and the main transformer are connected by adopting an oil-gas sleeve to bring about the problem of difficulty in maintenance and test, and the specific expression is that the GIS part is filled with SF6 gas, the main transformer part is filled with transformer oil, the main transformer part is difficult to separate from the GIS part to independently perform the test of the main transformer, and the main transformer part is difficult to separate to perform the test of the whole GIS part, so that the GIS and the main transformer are not easy to safely and easily independently realize the maintenance and the test of the GIS and the main transformer.
In order to solve the problems, the applicant designs an SF6 gas bushing outgoing line structure which can facilitate respective maintenance and test of GIS and a main transformer.
SUMMERY OF THE UTILITY MODEL
Based on above problem, the utility model provides a SF6 gas jacket goes out line structure. The utility model discloses can realize being convenient for to GIS and main maintenance, experimental purpose separately that become, mainly used GIS oil gas sheathed tube transformation engineering. By reliably connecting the SF6 gas sleeve and the overhead steel-cored aluminum strand with the transformer, the reliable isolation between the GIS and the main transformer can be realized only by detaching the overhead line during maintenance, thereby avoiding the problem that the GIS and the main transformer cannot be maintained and tested independently and being more favorable for independently maintaining and testing the GIS and the main transformer.
For solving the above technical problem, the utility model discloses a technical scheme as follows:
an SF6 gas sleeve outgoing line structure comprises a gas sleeve outgoing line structure, wherein the gas sleeve outgoing line structure comprises a gas sleeve and an overhead line, one end of the gas sleeve is provided with a transition cylinder, and one side of the transition cylinder is provided with a connecting cylinder; a plum blossom contact is arranged in the connecting cylinder, a sleeve conductor which is inserted into the gas sleeve and penetrates through the transition cylinder to be connected with the plum blossom contact in the connecting cylinder is arranged at the other end of the gas sleeve, and the sleeve conductor outside the gas sleeve is connected with an overhead line; the plum blossom contact tail is provided with a connecting conductor, the connecting conductor is provided with a shielding ring, and the tail part of the connecting cylinder is provided with a disc insulator connected with the shielding ring.
The utility model discloses in, the overhead line and the transformer on the sleeve pipe conductor are connected, and disc insulator and GIS pipe generating line are connected. When the GIS and the main transformer need to be separately and respectively maintained or tested, the overhead line is dismantled, and a natural isolation fracture is generated between the GIS and the main transformer. The GIS part can directly apply voltage on the gas sleeve to carry out electrical test through the structure without adding extra tools and charging and discharging SF6 gas, and without disassembling any sealing and insulating parts. After part of the main transformers are disconnected with the overhead lines, the transformer part can also be independently developed to carry out maintenance and test projects, SF6 gas and transformer oil do not need to be charged and discharged, and the aim of respectively maintaining and testing the GIS and the main transformers is fulfilled. The utility model discloses can realize being convenient for to GIS and main maintenance, experimental purpose separately that become, mainly used GIS oil gas sheathed tube transformation engineering. By reliably connecting the SF6 gas sleeve and the overhead steel-cored aluminum strand with the transformer, the reliable isolation between the GIS and the main transformer can be realized only by detaching the overhead line during maintenance, thereby avoiding the problem that the GIS and the main transformer cannot be maintained and tested independently and being more favorable for independently maintaining and testing the GIS and the main transformer.
As a preferred mode, the gas sleeve outgoing line structure comprises a main gas sleeve outgoing line structure and a sub gas sleeve outgoing line structure, the sub gas sleeve outgoing line structure is symmetrically distributed on the outer side of the main gas sleeve outgoing line structure, a connecting cylinder of the main gas sleeve outgoing line structure is a straight cylinder, the connecting cylinder of the sub gas sleeve outgoing line structure is in a bent shape which is far away from one side of the main gas sleeve outgoing line structure, and a connecting conductor in the connecting cylinder of the sub gas sleeve outgoing line structure is bent along with the connecting cylinder; the connecting cylinder of the main gas sleeve outlet structure is connected with the connecting cylinder of the main gas sleeve outlet structure through a connecting device.
As a preferred mode, the connecting device comprises a fixing sleeve, the fixing sleeve is fixed on two opposite sides of the connecting cylinder of the main gas casing outlet structure, a fixing column inserted into the fixing sleeve is arranged on one side, close to the main gas casing outlet structure, of the connecting cylinder of the sub gas casing outlet structure, and the fixing column is fixed in the fixing sleeve.
Preferably, the lower part of the connecting cylinder is provided with a transverse connecting bracket, and the lower part of the transverse connecting bracket is provided with a supporting pipe.
Preferably, the bushing conductor comprises a conductor joint and a conductor bushing, the conductor bushing is fixed on the conductor joint, and the conductor joint is provided with a plurality of connecting through holes.
As a preferred mode, a guide rod is arranged in the tulip contact, and the conductor sleeve is fixed on the guide rod.
As a preferable mode, the outer side pipe wall of the gas sleeve is provided with a plurality of groups of skirt edges with annular bulges, and the annular bulges comprise high annular bulges and low annular bulge skirt edges.
Compared with the prior art, the beneficial effects of the utility model are that:
(1) the utility model discloses can realize being convenient for to GIS and main maintenance, experimental purpose separately that become, mainly used GIS oil gas sheathed tube transformation engineering. By reliably connecting the SF6 gas sleeve and the overhead steel-cored aluminum stranded wire with the transformer, the GIS and the main transformer can be reliably isolated only by detaching the overhead wire during maintenance, thereby avoiding the problem that the GIS and the main transformer cannot be independently maintained and tested, and being more favorable for independently maintaining and testing the GIS and the main transformer;
(2) the utility model discloses a gas sleeve outlet structure comprises a main gas sleeve outlet structure and a sub-gas sleeve outlet structure, the sub-gas sleeve outlet structure is symmetrically distributed outside the main gas sleeve outlet structure, and the connecting cylinder of the main gas sleeve outlet structure is a straight cylinder, the connecting cylinder of the sub-gas sleeve outlet structure is in a curved shape which is far away from one side of the main gas sleeve outlet structure, and the connecting conductor in the connecting cylinder of the sub-gas sleeve outlet structure is curved along with the connecting cylinder; the connecting cylinder of the main gas sleeve outlet structure is connected with the connecting cylinder of the main gas sleeve outlet structure through a connecting device, the connecting cylinder and the connecting conductor on the sub gas sleeve outlet structure are bent, so that the connecting cylinder and the connecting conductor are connected with a straight conductor and a special-shaped conductor of a mature box-dividing GIS, and the connecting device connects the main gas sleeve outlet structure and the sub gas sleeve outlet structure into a whole, so that the control on the gas sleeve outlet structure is facilitated;
(3) the utility model discloses a connecting device includes the fixed cover, and the fixed cover is fixed on the relative both sides of connecting cylinder of main gas sleeve pipe outlet structure, and the connecting cylinder of sub gas sleeve pipe outlet structure leans on to be equipped with the fixed column of inserting in the fixed cover to main gas sleeve pipe outlet structure one side, and the fixed column is fixed in the fixed cover, inserts the fixed column on the connecting cylinder of sub gas sleeve pipe outlet structure in the fixed cover on the connecting cylinder of main gas sleeve pipe outlet structure to fix fixed column and fixed cover together, can realize linking together sub gas sleeve pipe outlet structure and main gas sleeve pipe outlet structure;
(4) the lower part of the connecting cylinder is provided with the transverse connecting bracket, the lower part of the transverse connecting bracket is provided with the supporting tube, and the transverse connecting bracket and the supporting tube are combined, thereby being beneficial to fixing and supporting the whole structure;
(5) the utility model discloses a sleeve pipe conductor includes conductor joint and conductor sleeve pipe, and the conductor sleeve pipe is fixed on the conductor joint, is equipped with a plurality of connect the via hole on the conductor joint, fixes the overhead line on the connect the via hole of conductor joint, and the overhead line is used for connecting with the transformer;
(6) the utility model discloses a be equipped with the guide bar in the plum blossom contact, the conductor sleeve pipe is fixed on the guide bar, will follow the gas sleeve pipe port and insert the sleeve pipe conductor in the gas sleeve pipe, in order to maintain the stability of conductor sleeve pipe, conductor joint and gas sleeve's port are connected, the conductor sleeve pipe that connects with conductor joint is inserted on the guide bar, thereby realize the stable contact with the plum blossom contact, and the guide bar can guarantee that the sleeve pipe conductor is reliably connected to the centering;
(7) the gas sleeve pipe has the advantages that the pipe wall on the outer side of the gas sleeve pipe is provided with the plurality of groups of annular bulge skirt edges, the annular bulges comprise the high annular bulges and the low annular bulge skirt edges, and the high annular bulges and the low annular bulge skirt edges increase the wavy bulges on the gas sleeve pipe, so that the increase of the creep distance on the outer side of the gas sleeve pipe is facilitated;
drawings
Fig. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a schematic top view of the present invention.
Fig. 3 is a schematic structural diagram of a tulip contact.
The device comprises a gas sleeve outgoing line structure 1, a main gas sleeve outgoing line structure 1-1, a sub gas sleeve outgoing line structure 1-2, an overhead line 2, a gas sleeve 30, an annular bulge 310, an annular bulge 311, an annular bulge 312 low, a sleeve conductor 40, a conductor joint 410, a connecting through hole 411, a conductor sleeve 420, a transition cylinder 5, a connecting cylinder 60, a plum blossom contact 610, a guide rod 611, a connecting conductor 7, a shielding ring 8, a disc insulator 9, a connecting device 10, a fixed sleeve 110, a fixed column 120, a transverse connecting support 11 and a supporting tube 12.
Detailed Description
The present invention will be further described with reference to the accompanying drawings. Embodiments of the present invention include, but are not limited to, the following examples.
Example 1:
referring to fig. 1-3, an SF6 gas bushing outgoing line structure 1 comprises a gas bushing outgoing line structure 1, wherein the gas bushing outgoing line structure 1 comprises a gas bushing 30 and an overhead line 2, a transition cylinder 5 is arranged at one end of the gas bushing 30, and a connecting cylinder 60 is arranged at one side of the transition cylinder 5; a plum blossom contact 610 is arranged in the connecting cylinder 60, a sleeve conductor 40 which is inserted into the gas sleeve 30 and penetrates through the transition cylinder 5 to be connected with the plum blossom contact 610 in the connecting cylinder 60 is arranged at the other end of the gas sleeve 30, and the sleeve conductor 40 on the outer side of the gas sleeve 30 is connected with the overhead line 2; the tail of the tulip contact 610 is provided with a connecting conductor 7, the connecting conductor 7 is provided with a shielding ring 8, and the tail of the connecting cylinder 60 is provided with a disc insulator 9 connected with the shielding ring 8.
The bushing conductor 30 is an electrical conductor connected to the inside of the overhead wire 1 to SF6 gas bushing 20 in this configuration. The gas sleeve 20 is made of silicon rubber or porcelain sleeve materials, and has the functions of supporting and fixing the sleeve 9 and the conductor 30, increasing creep distance, containing insulating SF6 gas and the like. The transition cylinder 4 plays a role of connecting the connecting cylinder 50 and has a voltage-sharing electric field and a shielding function for the end part of the sleeve conductor 30. The tulip contact 510 is used for connecting and plugging the sleeve conductor 30 and plays a role in conducting electricity, and the guide rod 511 inside the tulip contact can also ensure that the sleeve conductor 30 plays a role in reliable centering connection. The connecting cylinder 50 is divided into a straight cylinder shape and a curved shape, and the straight cylinder shape and the curved shape of the connecting cylinder 50 are used for connecting the transition cylinder 4 and the disc insulator 8 of the GIS gas pipe bus. The connecting conductor 6 is mainly used for reliably connecting the plum blossom contact 510 and the disc insulator 8 conductive insert by a straight/easy-shaped conductor of a mature box GIS, so that the continuity of the conduction is ensured. The shield ring 7 mainly functions to uniform, shield and improve the electric field at the conductive portion near the disc insulator 8. The disc insulator 8 plays the roles of fixing the conductor, separating the air chamber and connecting the left GIS pipe bus.
In this example, the overhead wire 2 on the bushing conductor 40 is connected to a transformer, and the disc insulator 9 is connected to a GIS pipe bus. When the GIS and the main transformer need to be separately and respectively maintained or tested, the overhead line 2 is dismantled, so that a natural isolation fracture is generated between the GIS and the main transformer. The GIS part can directly apply voltage on the gas sleeve 30 to carry out electrical test through the structure without adding extra tools and charging and discharging SF6 gas, and without disassembling any sealing and insulating parts. After part of the main transformer is disconnected with the overhead line 2, the transformer part can also be independently developed to carry out maintenance and test projects, SF6 gas and transformer oil do not need to be charged and discharged, and the aim of respective maintenance and test of the GIS and the main transformer is achieved. The utility model discloses can realize being convenient for to GIS and main maintenance, experimental purpose separately that become, mainly used GIS oil gas sheathed tube transformation engineering. By reliably connecting the SF6 gas sleeve 30 and the overhead steel-cored aluminum strand with the transformer, the reliable isolation between the GIS and the main transformer can be realized only by detaching the overhead line 2 during maintenance, thereby avoiding the problem that the GIS and the main transformer cannot be maintained and tested independently and being more favorable for independently maintaining and testing the GIS and the main transformer.
Example 2:
referring to fig. 1-3, an SF6 gas bushing outgoing line structure 1 comprises a gas bushing outgoing line structure 1, wherein the gas bushing outgoing line structure 1 comprises a gas bushing 30 and an overhead line 2, a transition cylinder 5 is arranged at one end of the gas bushing 30, and a connecting cylinder 60 is arranged at one side of the transition cylinder 5; a plum blossom contact 610 is arranged in the connecting cylinder 60, a sleeve conductor 40 which is inserted into the gas sleeve 30 and penetrates through the transition cylinder 5 to be connected with the plum blossom contact 610 in the connecting cylinder 60 is arranged at the other end of the gas sleeve 30, and the sleeve conductor 40 on the outer side of the gas sleeve 30 is connected with the overhead line 2; the tail of the tulip contact 610 is provided with a connecting conductor 7, the connecting conductor 7 is provided with a shielding ring 8, and the tail of the connecting cylinder 60 is provided with a disc insulator 9 connected with the shielding ring 8.
The gas casing outgoing line structure 1 comprises a main gas casing outgoing line structure 1-1 and a sub gas casing outgoing line structure 1-2, the sub gas casing outgoing line structure 1-2 is symmetrically distributed on the outer side of the main gas casing outgoing line structure 1-1, a connecting cylinder 60 of the main gas casing outgoing line structure 1-1 is a straight cylinder, the connecting cylinder 60 of the sub gas casing outgoing line structure 1-2 is in a bent shape which is far away from one side of the main gas casing outgoing line structure 1-1, and a connecting conductor 7 in the connecting cylinder 60 of the sub gas casing outgoing line structure 1-2 is bent along with the connecting cylinder 60; the connecting cylinder 60 of the main gas sleeve outgoing line structure 1-1 is connected with the connecting cylinder 60 of the main gas sleeve outgoing line structure 1-1 through the connecting device 10, the connecting cylinder 60 and the connecting conductor 7 on the sub gas sleeve outgoing line structure 1-2 are in a bent shape, so that connection with a straight conductor and a special-shaped conductor of a mature box GIS is facilitated, and the connecting device 10 connects the main gas sleeve outgoing line structure 1-1 and the sub gas sleeve outgoing line structure 1-2 into a whole, so that control over the gas sleeve outgoing line structure 1 is facilitated.
In order to connect the sub gas bushing outlet structure 1-2 and the main gas bushing outlet structure 1-1, as a preferred mode, the connecting device 10 includes a fixing sleeve 110, the fixing sleeve 110 is fixed on two opposite sides of the connecting cylinder 60 of the main gas bushing outlet structure 1-1, a fixing column 120 inserted into the fixing sleeve 110 is arranged on one side of the connecting cylinder 60 of the sub gas bushing outlet structure 1-2, which is close to the main gas bushing outlet structure 1-1, the fixing column 120 is fixed in the fixing sleeve 110, the fixing column 120 on the connecting cylinder 60 of the sub gas bushing outlet structure 1-2 is inserted into the fixing sleeve 110 on the connecting cylinder 60 of the main gas bushing outlet structure 1-1, and the fixing column 120 and the fixing sleeve 110 are fixed together.
In order to fix and support the whole structure, it is preferable that the transversal connecting bracket 11 is provided at a lower portion of the connecting cylinder 60, the support tube 12 is provided at a lower portion of the transversal connecting bracket 11, and the transversal connecting bracket 11 and the support tube 12 are combined.
In order to fix the overhead wire 2 to the bushing conductor 40, it is preferable that the bushing conductor 40 includes a conductor tab 410 and a conductor bushing 420, the conductor bushing 420 is fixed to the conductor tab 410, the conductor tab 410 is provided with a plurality of connection through holes 411, the overhead wire 2 is fixed to the connection through holes 411 of the conductor tab 410, and the overhead wire 2 is used for connection to a transformer.
In order to achieve stable contact with the tulip contact 610, as a preferable mode, a guide bar 611 is provided in the tulip contact 610, the conductor bushing 420 is fixed on the guide bar 611, the bushing conductor 40 is inserted into the gas bushing 30 from the port of the gas bushing 30, in order to maintain the stability of the conductor bushing 420, the conductor connector 410 is connected with the port of the gas bushing 30, the conductor bushing 420 connected with the conductor connector 410 is inserted on the guide bar 611, and the guide bar 611 can ensure that the bushing conductor 40 is reliably connected in a centered manner.
In order to increase the creep distance outside the gas sleeve 30, it is preferable that the outer wall of the gas sleeve 30 is provided with a plurality of sets of annular protrusions 310, each set of annular protrusions comprises a high annular protrusion 311 and a low annular protrusion 312, and the high annular protrusion 311 and the low annular protrusion 312 increase the wavy protrusions on the gas sleeve 30.
The other parts of this embodiment are the same as embodiment 1, and are not described herein again.
The embodiment of the present invention is the above. The above embodiments and the specific parameters in the embodiments are only for the purpose of clearly showing the verification process of the utility model, and are not used to limit the patent protection scope of the utility model, the patent protection scope of the utility model is still subject to the claims, all the equivalent structural changes made by using the contents of the specification and the drawings of the utility model are included in the protection scope of the utility model.

Claims (7)

1. An SF6 gas bushing outlet structure is characterized in that: the gas sleeve outgoing line structure comprises a gas sleeve outgoing line structure (1), wherein the gas sleeve outgoing line structure (1) comprises a gas sleeve (30) and an overhead line (2), one end of the gas sleeve (30) is provided with a transition cylinder (5), and one side of the transition cylinder (5) is provided with a connecting cylinder (60); a plum blossom contact (610) is arranged in the connecting cylinder (60), a sleeve conductor (40) which is inserted into the gas sleeve (30) and penetrates through the transition cylinder (5) to be connected with the plum blossom contact (610) in the connecting cylinder (60) is arranged at the other end of the gas sleeve (30), and the sleeve conductor (40) on the outer side of the gas sleeve (30) is connected with the overhead line (2); the connecting device is characterized in that a connecting conductor (7) is arranged at the tail of the tulip contact (610), a shielding ring (8) is arranged on the connecting conductor (7), and a disc insulator (9) connected with the shielding ring (8) is arranged at the tail of the connecting cylinder (60).
2. The SF6 gas sleeve outlet structure of claim 1, wherein: the gas sleeve outgoing line structure (1) comprises a main gas sleeve outgoing line structure (1-1) and a sub gas sleeve outgoing line structure (1-2), the sub gas sleeve outgoing line structure (1-2) is symmetrically distributed on the outer side of the main gas sleeve outgoing line structure (1-1), a connecting cylinder (60) of the main gas sleeve outgoing line structure (1-1) is a straight cylinder, a connecting cylinder (60) of the sub gas sleeve outgoing line structure (1-2) is in a bent shape which is far away from one side of the main gas sleeve outgoing line structure (1-1), and a connecting conductor (7) in the connecting cylinder (60) of the sub gas sleeve outgoing line structure (1-2) is bent along with the connecting cylinder (60); the connecting cylinder (60) of the main gas casing outlet structure (1-1) is connected with the connecting cylinder (60) of the main gas casing outlet structure (1-1) through a connecting device (10).
3. The SF6 gas sleeve outlet structure of claim 2, wherein: the connecting device (10) comprises a fixing sleeve (110), the fixing sleeve (110) is fixed on two opposite sides of a connecting cylinder (60) of the main gas sleeve outgoing line structure (1-1), a fixing column (120) inserted into the fixing sleeve (110) is arranged on one side, close to the main gas sleeve outgoing line structure (1-1), of the connecting cylinder (60) of the sub gas sleeve outgoing line structure (1-2), and the fixing column (120) is fixed in the fixing sleeve (110).
4. The SF6 gas sleeve outlet structure of claim 1, wherein: the lower part of the connecting cylinder (60) is provided with a transverse connecting bracket (11), and the lower part of the transverse connecting bracket (11) is provided with a supporting pipe (12).
5. The SF6 gas sleeve outlet structure of claim 1, wherein: the sleeve conductor (40) comprises a conductor joint (410) and a conductor sleeve (420), the conductor sleeve (420) is fixed on the conductor joint (410), and a plurality of connecting through holes (411) are formed in the conductor joint (410).
6. The SF6 gas sleeve outlet structure of claim 5, wherein: a guide rod (611) is arranged in the tulip contact (610), and the conductor sleeve (420) is fixed on the guide rod (611).
7. The SF6 gas sleeve outlet structure of claim 1, wherein: the gas sleeve (30) is characterized in that the outer side pipe wall is provided with a plurality of groups of skirt edges of annular bulges (310), and each annular bulge comprises a high annular bulge (311) and a low annular bulge (312).
CN201920798755.9U 2019-05-30 2019-05-30 SF6 gas casing outlet structure Active CN209844394U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201920798755.9U CN209844394U (en) 2019-05-30 2019-05-30 SF6 gas casing outlet structure

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201920798755.9U CN209844394U (en) 2019-05-30 2019-05-30 SF6 gas casing outlet structure

Publications (1)

Publication Number Publication Date
CN209844394U true CN209844394U (en) 2019-12-24

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN201920798755.9U Active CN209844394U (en) 2019-05-30 2019-05-30 SF6 gas casing outlet structure

Country Status (1)

Country Link
CN (1) CN209844394U (en)

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