CN210865857U - Sleeve pipe end screen earthing device - Google Patents
Sleeve pipe end screen earthing device Download PDFInfo
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- CN210865857U CN210865857U CN201921990131.3U CN201921990131U CN210865857U CN 210865857 U CN210865857 U CN 210865857U CN 201921990131 U CN201921990131 U CN 201921990131U CN 210865857 U CN210865857 U CN 210865857U
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Abstract
The utility model relates to a bushing end screen grounding device, wherein a metal sleeve is provided with an internal thread which is used for being screwed with a bushing end screen seat, a middle transparent sleeve is positioned between the metal sleeve and a metal end cover, and the metal sleeve and the metal end cover are bolted through a metal bolt; the center of the metal end cover is provided with a threaded hole, the grounding electrode is provided with external threads matched with the threaded hole of the metal end cover, one end of the grounding electrode penetrates through the threaded hole of the metal end cover and is in threaded connection with the threaded hole of the metal end cover, the current mutual inductance indicator lamp is sleeved on the part of the grounding electrode penetrating through the metal end cover, and the end part of the grounding electrode penetrating through the metal end cover is provided with a metal elastic piece. The utility model can ensure good grounding and visible grounding condition, and can find grounding fault in time; simple structure, convenient operation can monitor the ground connection state, provides reliable ground connection again, has effectively ensured equipment safety, prevents that the end screen ground connection is bad to cause the accident.
Description
Technical Field
The utility model relates to a substation equipment technical field especially relates to a sleeve pipe end screen earthing device.
Background
The bushing is an important main component of the power transformer, mainly plays roles of insulating against ground, supporting and carrying current of an outgoing line in the transformer, and has enough electrical and mechanical strength. The sleeve can bear long-term load current in operation and bear instantaneous overheating in short circuit, namely good thermal stability. If the transformer bushing is defective or fails, the safe operation of the transformer and the power supply reliability thereof are directly endangered. In recent years, the failure rate of the running capacitive bushing tends to increase, and the main failure causes include oil leakage, overheating of a bushing joint and poor grounding of a bushing end screen. Faults such as oil leakage can be found through routing inspection and infrared temperature measurement, but poor grounding of the end screen of the sleeve is difficult to effectively find in time, and the damage to the operation of the transformer is great. According to incomplete statistics, the failure due to poor grounding of the bushing end screen accounts for 5.3% of the total number of the bushing failures. Therefore, it is necessary to enhance the monitoring of the operation of the end screen of the casing and to perform maintenance and test in time.
The grounding structure of the end screen generally adopts three modes of small sleeve leading-out external connection, spring rebound grounding and grounding through a grounding cap. The small sleeve leading-out mode has the advantages of being visual and capable of directly observing whether the external grounding of the end screen is reliable or not. However, the following problems exist in the operation and maintenance process: when the grounding metal connecting sheet is disassembled in power failure inspection or test, a lead post (screw) is easy to rotate, and an internal end screen grounding lead wire is easy to fall off under stress, so that the end screen is not reliably grounded; the grounding metal connecting sheet is easy to crack and break due to stress when being frequently disassembled, and is easy to pull (shake) to a small sleeve, so that the sealing degree of the small sleeve is reduced; the surface of the end screen small porcelain bushing is easy to be polluted, and the insulation resistance and the end screen dielectric loss measured value in routine tests can be influenced; the unreliable grounding of the grounding metal connecting sheet or the grounding metal flexible wire is easily caused after the paint spraying of the transformer and the sleeve; easy ponding is affected with damp ageing, also easily the mistake is bumped in the work and is stepped on by mistake and lead to damaging.
The spring rebounding grounding mode has the advantages that the grounding can be automatically performed, and the condition that the end screen is not grounded due to negligence of workers is avoided. But the defects are that when the spring elasticity is reduced or the grounding sleeve and the lead post are jammed, the grounding sleeve cannot be completely popped out, so that the grounding of the end screen is unreliable; during field test, the single side of the screwdriver is adopted to push and press the grounding sleeve, so that the failure of the spring is easily caused, and poor grounding is caused; the end screen structure seals well but is not intuitive enough.
The grounding mode of the grounding cap has the defects that poor contact with a lead post is caused when the elasticity of the spring piece is reduced or deformed, and the end screen is difficult to reliably ground; after the test, whether the end screen grounding is reliable or not cannot be checked; the screwing position of the grounding cap is difficult to accurately determine, and unreliable grounding or stress on a lead post is easily caused.
The existing bushing end screen grounding device cannot indicate the grounding state of the bushing, namely whether the grounding is good or not, and particularly, a grounding state observation and early warning means is lacked aiming at a spring rebound grounding mode.
SUMMERY OF THE UTILITY MODEL
To above not enough, the utility model provides a visual, the reliable sleeve pipe end screen earthing device of ground connection state.
In order to achieve the above object, the embodiments of the present invention adopt the following technical solutions:
a sleeve end screen grounding device comprises a metal sleeve, a middle transparent sleeve, a metal end cover, a grounding electrode and a current mutual inductance indicator lamp; the metal sleeve is provided with internal threads used for being in threaded connection with the sleeve end screen seat, the middle transparent sleeve is positioned between the metal sleeve and the metal end cover, and the metal sleeve and the metal end cover are in bolted connection through metal bolts; the center of metal end cover is equipped with the screw hole, the earthing pole be equipped with the screw hole assorted external screw thread of metal end cover, the one end of earthing pole is passed the screw hole of metal end cover and spiro union are on the screw hole of metal end cover, the mutual inductance pilot lamp of electric current overlaps and establishes the part that the earthing pole passed the metal end cover, the tip that the earthing pole passed the metal end cover is equipped with metal elastic component.
By arranging the metal sleeve, the middle transparent sleeve, the metal end cover, the grounding electrode and the metal elastic piece, a grounding state is formed between the metal sleeve and the sleeve end screen during implementation, and the grounding reliability is ensured; the mutual inductance current indicator lamp is sleeved on the grounding electrode, and when the grounding is good, the mutual inductance current indicator lamp can emit light, so that the visual grounding condition is realized, and the hidden trouble of poor grounding can be found in time.
Further, the metal elastic part is a spring, a reed or a spring thimble made of metal, different forms are selected according to different requirements, so that the metal elastic part is adapted to actual requirements and an end screen binding post, and the metal elastic part is convenient to mount and increases contact pressure.
Furthermore, the outward part of earthing pole is installed the nut of screwing in the matching, one side laminating of nut of screwing is in the lateral surface of metal end cover can firmly lock the earthing pole on the metal end cover to can give the trend of earthing pole inward movement.
Furthermore, the metal sleeve and the metal end cover are both in a circular boss structure, and two ends of the middle transparent sleeve are respectively sleeved on the bosses of the metal sleeve and the metal end cover, so that the metal sleeve, the middle transparent sleeve and the metal end cover are stably connected.
Furthermore, the metal sleeve and the metal end cover are made of aluminum alloy or copper alloy, the aluminum alloy and the copper alloy have low density, but the strength is higher and is close to or exceeds that of high-quality steel, the plasticity is good, and the metal sleeve and the metal end cover can be processed into various sections and have excellent electrical conductivity, thermal conductivity and corrosion resistance.
Further, the material of middle transparent sleeve is ya keli organic glass, and ya keli organic glass has better transparency, chemical stability and weatherability, workable.
Furthermore, the material of earthing pole is copper or copper alloy, and copper or copper alloy have the ductility good, advantages such as heat conductivity and electric conductivity height.
Furthermore, the joint surfaces among the metal sleeve, the middle transparent sleeve, the metal end cover and the grounding electrode are all provided with rubber sealing gaskets to realize sealing, so that the sleeve end screen is prevented from being affected with damp.
The utility model has the advantages that:
1. the utility model can ensure good grounding and visible grounding condition, and can find grounding fault in time;
2. the end part of the grounding electrode is provided with a metal elastic part, so that the grounding electrode is suitable for different sleeve end screen binding posts, and has strong adaptability;
3. the utility model discloses simple structure, convenient operation can monitor the ground connection state, provides reliable ground connection again, has effectively ensured equipment safety, prevents that end screen earthing failure from causing the accident.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly described below.
Fig. 1 is a schematic structural diagram of an embodiment of the present invention;
FIG. 2 is an exploded view of FIG. 1;
FIG. 3 is an isometric cross-sectional view of FIG. 1;
fig. 4 is a schematic diagram of an embodiment of the present invention.
Wherein the labels shown in the figures are: 1: metal sleeve, 2: intermediate transparent sleeve, 3: metallic end cap, 4: grounding electrode, 5: mutual inductance indicator lamp of electric current, 6: end screen lead post, 7: metal bolt, 8: metal elastic member, 9: screw nut, 10: the sleeve pipe end screen seat.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It is to be understood that the embodiments described are only some embodiments of the invention, and not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
Referring to fig. 1 to 3, a preferred embodiment of the present invention provides a bushing end screen grounding device, which includes a metal sleeve 1, a middle transparent sleeve 2, a metal end cover 3, a grounding electrode 4 and a current mutual inductance indicator lamp 5.
The metal sleeve 1 is a double-layer circular boss structure, the two ends of the metal sleeve are communicated with each other, the hollow structure is formed, and internal threads used for being in threaded connection with the sleeve end screen seat are arranged on the inner side wall of the metal sleeve 1. The metal end cover 3 is also in a double-layer circular boss structure. Middle transparent sleeve 2 is the hollow structure that both ends link up, and both ends internal diameter equals the external diameter of the less boss of metal sleeve 1 and metal end cover 3, and middle transparent sleeve 2 is located between metal sleeve 1 and the metal end cover 3, and the both ends of middle transparent sleeve 2 cup joint respectively on the less boss of metal sleeve 1 and metal end cover 3 to realize middle transparent sleeve 2 and the grafting of metal sleeve 1 and metal end cover 3. The metal sleeve 1 and the metal end cover 3 are bolted through a metal bolt 7, specifically, four screw holes are uniformly formed in the metal sleeve 1 and the metal end cover 3 respectively, and the screw holes are internally matched with the screw-in metal bolts 7, so that the metal sleeve 1 and the metal end cover 3 are stably connected, and the middle transparent sleeve 2 is tightly pressed between the metal sleeve 1 and the metal end cover 3. The metal sleeve 1, the metal end cover 3 and the metal bolt 7 are made of metal materials and have a conductive effect so as to ensure good grounding. In the preferred embodiment, the metal sleeve 1 and the metal end cap 3 are made of aluminum alloy, which has low density but relatively high strength close to or exceeding that of high-quality steel, has good plasticity, can be processed into various shapes, and has excellent electrical conductivity, thermal conductivity and corrosion resistance. The material of middle transparent sleeve 2 is ya keli organic glass, and ya keli organic glass has better transparency, chemical stability and weatherability, workable, and transparent middle transparent sleeve 2 is convenient for observe the inside condition of middle transparent sleeve 2.
The center of metal end cover 3 is equipped with the screw hole, and earthing pole 4 is cylindricly, and earthing pole 4 is equipped with the external screw thread with metal end cover 3's screw hole assorted, and the screw hole of metal end cover 3 is passed and the spiro union is on metal end cover 3's screw hole to the one end of earthing pole 4. The grounding electrode 4 is made of copper, and the copper has the advantages of good ductility, high thermal conductivity and electric conductivity and the like. The mutual inductance indicator lamp of electric current 5 cover is established and is passed the part of metal end cover 3 at earthing pole 4 (be located metal sleeve 1 promptly, the inside part of middle transparent sleeve 2 and metal end cover 3), the preferred DLKG002 of model of the mutual inductance indicator lamp of electric current 5, earthing pole 4 passes the tip of metal end cover 3 (be located metal sleeve 1 promptly, the tip of the inside of middle transparent sleeve 2 and metal end cover 3) and is equipped with metal elastic component 8, metal elastic component 8 is the spring of metal material, metal elastic component 8 has certain distance adaptability, and easy to assemble and increased contact pressure. And a screwing nut 9 is arranged on the outward part of the grounding electrode 4 in a matching way, and one side of the screwing nut 9 is attached to the outer side surface of the metal end cover 3.
The joint surfaces among the metal sleeve 1, the middle transparent sleeve 2, the metal end cover 3 and the grounding electrode 4 are all provided with rubber sealing gaskets to realize sealing, and the sleeve end screen can be ensured not to be affected with damp in the implementation process.
When the grounding device is used, referring to fig. 4, an original end screen cover of a sleeve end screen is screwed out, the metal sleeve 1 is screwed into the sleeve end screen seat 10, at the moment, the sleeve end screen grounding device is installed on the sleeve end screen, the specific conditions inside the metal sleeve 1, the middle transparent sleeve 2 and the metal end cover 3 can be observed through the transparent middle transparent sleeve 2, the grounding electrode 4 is adjusted, the grounding electrode 4 is screwed into the end screen lead post 6 (the sleeve end screen seat and the end screen lead post are only partially shown in the figure) until the metal elastic piece 8 at the end part of the grounding electrode is tightly pressed with the end screen lead post 6, then the screwing nut 9 on the grounding electrode 4 is screwed, so that the grounding electrode is tightly attached to the outer side of the metal end cover, and at the moment, the reliable grounding of the sleeve end screen can be realized. When the bushing end screen normally operates, the current mutual inductance indicator lamp 5 collects the current flowing through the grounding electrode 4, and the current mutual inductance indicator lamp 5 is on, so that the bushing end screen can be judged to be normally grounded; when the bushing end screen is in poor grounding, the current mutual inductance indicator lamp 5 flickers or does not light, and accordingly the bushing end screen can be judged to be in poor grounding. Transparent middle transparent sleeve 2 can direct observation inside situation, observes the contact condition of metal elastic component 8 and end screen pin 6, observes the operating condition of mutual inductive indicator lamp of electric current 5 (the lamp is bright, the lamp dodges or the lamp goes out), can also observe whether defect such as corrosion, discharge of sleeve pipe end screen when overhauing or having a power failure to in time handle.
The utility model can ensure good grounding and visible grounding condition, and can find grounding fault in time; the end of the grounding electrode is provided with a metal elastic piece, so that the grounding electrode is suitable for different sleeve end screen binding posts, and has strong adaptability. The utility model discloses simple structure, convenient operation can monitor the ground connection state, provides reliable ground connection again, has effectively ensured equipment safety, prevents that end screen earthing failure from causing the accident.
The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention should be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (8)
1. The utility model provides a sleeve pipe end screen earthing device which characterized in that: the device comprises a metal sleeve (1), a middle transparent sleeve (2), a metal end cover (3), a grounding electrode (4) and a current mutual inductance indicator lamp (5);
the metal sleeve (1) is provided with an internal thread used for being in threaded connection with a sleeve end screen seat, the middle transparent sleeve (2) is located between the metal sleeve (1) and the metal end cover (3), and the metal sleeve (1) and the metal end cover (3) are in bolted connection through a metal bolt (7);
the center of metal end cover (3) is equipped with the screw hole, earthing pole (4) be equipped with the screw hole assorted external screw thread of metal end cover (3), the one end of earthing pole (4) is passed the screw hole and the spiro union of metal end cover (3) are on the screw hole of metal end cover (3), the part that earthing pole (4) passed metal end cover (3) is established in mutual inductive indicator of current (5) cover, the tip that earthing pole (4) passed metal end cover (3) is equipped with metal elastic component (8).
2. The bushing tap grounding device of claim 1, wherein: the metal elastic piece (8) is a spring, a reed or a spring thimble made of metal.
3. The bushing tap grounding device of claim 1, wherein: the outward part of earthing pole (4) matches and installs nut (9) of screwing, one side laminating of nut (9) of screwing is in the lateral surface of metal end cover (3).
4. The bushing tap grounding device of claim 1, wherein: the metal sleeve (1) and the metal end cover (3) are both of circular boss structures, and two ends of the middle transparent sleeve (2) are respectively sleeved on bosses of the metal sleeve (1) and the metal end cover (3).
5. The bushing tap grounding device of claim 1, wherein: the metal sleeve (1) and the metal end cover (3) are made of aluminum alloy or copper alloy.
6. The bushing tap grounding device of claim 1, wherein: the middle transparent sleeve (2) is made of acrylic organic glass.
7. The bushing tap grounding device of claim 1, wherein: the grounding electrode (4) is made of copper or copper alloy.
8. The bushing tap grounding device of claim 1, wherein: and the joint surfaces among the metal sleeve (1), the middle transparent sleeve (2), the metal end cover (3) and the grounding electrode (4) are all provided with rubber gaskets to realize sealing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921990131.3U CN210865857U (en) | 2019-11-18 | 2019-11-18 | Sleeve pipe end screen earthing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921990131.3U CN210865857U (en) | 2019-11-18 | 2019-11-18 | Sleeve pipe end screen earthing device |
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| Publication Number | Publication Date |
|---|---|
| CN210865857U true CN210865857U (en) | 2020-06-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921990131.3U Active CN210865857U (en) | 2019-11-18 | 2019-11-18 | Sleeve pipe end screen earthing device |
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| CN (1) | CN210865857U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111599584A (en) * | 2020-07-20 | 2020-08-28 | 广东电网有限责任公司东莞供电局 | High-voltage bushing end screen device |
| CN113552503A (en) * | 2021-07-14 | 2021-10-26 | 中国大唐集团科学技术研究院有限公司西北电力试验研究院 | End screen grounding and state detection device for high-voltage oilpaper capacitive bushing |
-
2019
- 2019-11-18 CN CN201921990131.3U patent/CN210865857U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111599584A (en) * | 2020-07-20 | 2020-08-28 | 广东电网有限责任公司东莞供电局 | High-voltage bushing end screen device |
| CN113552503A (en) * | 2021-07-14 | 2021-10-26 | 中国大唐集团科学技术研究院有限公司西北电力试验研究院 | End screen grounding and state detection device for high-voltage oilpaper capacitive bushing |
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