CN115020072B - High-reliability explosion-proof oil-immersed current transformer - Google Patents
High-reliability explosion-proof oil-immersed current transformer Download PDFInfo
- Publication number
- CN115020072B CN115020072B CN202210747192.7A CN202210747192A CN115020072B CN 115020072 B CN115020072 B CN 115020072B CN 202210747192 A CN202210747192 A CN 202210747192A CN 115020072 B CN115020072 B CN 115020072B
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- expander
- explosion
- storage cabinet
- oil storage
- current transformer
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- 238000007789 sealing Methods 0.000 claims abstract description 18
- 238000004880 explosion Methods 0.000 claims abstract description 12
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical group [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 12
- 229910052782 aluminium Inorganic materials 0.000 claims description 12
- 238000002347 injection Methods 0.000 claims description 9
- 239000007924 injection Substances 0.000 claims description 9
- 229920005560 fluorosilicone rubber Polymers 0.000 claims description 5
- 229910052573 porcelain Inorganic materials 0.000 claims description 5
- 238000009987 spinning Methods 0.000 claims description 5
- 230000000694 effects Effects 0.000 abstract description 6
- 238000009413 insulation Methods 0.000 abstract description 5
- 230000002159 abnormal effect Effects 0.000 abstract description 4
- 230000015556 catabolic process Effects 0.000 abstract description 4
- 230000002265 prevention Effects 0.000 abstract description 2
- 238000005266 casting Methods 0.000 description 6
- 230000007547 defect Effects 0.000 description 3
- 239000004576 sand Substances 0.000 description 3
- 239000012212 insulator Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/08—Cooling; Ventilating
- H01F27/10—Liquid cooling
- H01F27/12—Oil cooling
- H01F27/14—Expansion chambers; Oil conservators; Gas cushions; Arrangements for purifying, drying, or filling
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/02—Casings
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F38/00—Adaptations of transformers or inductances for specific applications or functions
- H01F38/20—Instruments transformers
- H01F38/22—Instruments transformers for single phase ac
- H01F38/28—Current transformers
- H01F38/30—Constructions
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Gas-Insulated Switchgears (AREA)
- Transformer Cooling (AREA)
Abstract
The invention provides a high-reliability explosion-proof oil immersed current transformer, which relates to the technical field of transformers for the power industry, and adopts the following scheme: the novel oil storage device comprises a device body, the upper portion of the device body is provided with an oil storage cabinet, the upper portion of the oil storage cabinet is provided with an expander, the expander comprises an expansion joint, an expander housing main body and an expander housing top cover, a pressure relief opening is formed in the upper portion of the expansion joint, an explosion-proof piece is sealed on the pressure relief opening and is fixed through a pressing ring, a sealing gasket is arranged between the pressing ring and the expansion joint, the expander housing main body and the expander housing top cover are of a split type structure, and a movable opening is formed in the joint of the expander housing main body and the expander housing top cover. The invention has the following effects: when the power system has short circuit or breakdown and other abnormal arc faults occur in the main insulation of the equipment, and the internal pressure of the product is increased sharply, the transformer can play a role in quick pressure relief and explosion prevention.
Description
Technical Field
The invention relates to the technical field of transformers for the power industry, in particular to a high-reliability explosion-proof oil-immersed current transformer.
Background
The oil immersed type current transformer is of an oilpaper composite type insulation structure, and when an abnormal arc fault such as short circuit or breakdown of equipment main insulation occurs in a power system, equipment explosion and fire are extremely easy to occur, so that the operation safety of the power system is seriously affected. Because the most top of the oil immersed current transformer in the industry is mostly of an expander structure, and the internal circulation channel is smaller, the quick transmission of pressure is not facilitated, when the internal pressure of a product is increased sharply, the structure severely limits the release of the pressure, the oil storage cabinet of the product is easy to burst, and the safety operation of a power grid is greatly hidden danger, so that serious adverse effects are caused.
Disclosure of Invention
The invention aims to provide and design a high-reliability explosion-proof oil-immersed current transformer, aiming at the problem that the oil storage cabinet of a product is easy to burst due to rapid increase of internal pressure caused by abnormal arc faults such as short circuit or breakdown of equipment main insulation in a power system, and the like of the conventional oil-immersed current transformer.
The technical scheme adopted by the invention for solving the technical problems is as follows: the utility model provides a high reliable explosion-proof formula current transformer, includes the ware body, the upper portion of ware body is provided with the oil storage cabinet, and the upper portion of oil storage cabinet is provided with the expander, and the expander includes expansion joint, expander dustcoat main part, expander dustcoat top cap, and open on the upper portion of expansion joint has the pressure release mouth, seals on the pressure release mouth and has explosion proof piece, and explosion proof piece passes through the clamping ring to be fixed, is provided with sealing washer between clamping ring and the expansion joint, and the junction of expander dustcoat main part and expander dustcoat top cap has been seted up the loose piece. By additionally arranging the explosion-proof sheet structure, the pressure is sensitive due to the structural characteristics of the explosion-proof sheet, and when the internal pressure is rapidly increased and exceeds the rated explosion pressure limit value of the explosion-proof sheet, the explosion-proof sheet acts to realize the rapid pressure relief of the product; a sealing gasket is arranged between the pressing ring and the expansion joint, so that the sealing effect on the mounting position of the explosion-proof piece is achieved, the sealing performance of the mounting position of the explosion-proof piece is enhanced, and the top explosion-proof piece can reach explosion pressure more conveniently; the expander housing top cover and the expander housing main body are of split type structures, a movable opening is formed in the joint of the housing top cover and the housing main body, when the expander top cover is stressed, the housing top cover and the housing main body can be quickly separated, expansion of the internal expander structure can not be limited, and when the expansion joint expands and stretches, the vertical direction is guaranteed to be free of the limitation of the housing so as to quickly act, and therefore the purposes of quick pressure relief and explosion prevention of products are achieved.
Further, at least two pressure relief grooves are formed in the rupture disk. Because be provided with two piece at least pressure release recesses on the rupture disk, the pressure release recess is more easily broken through than other parts of rupture disk, can realize carrying out the pressure release through the pressure release recess when die cavity internal pressure is too big.
Further, the pressure relief groove is located on the air side of the explosion-proof piece, namely, the outward side, and the pressure relief groove is of a cross groove structure. The maximum rated pressure of 0.06-0.1MPa can be born, when the bearing pressure is greater than the rated pressure, the explosion-proof sheet acts, and the cross-shaped groove part is cracked first, so that the internal pressure of the product is released rapidly.
Further, the oil storage cabinet is of an aluminum plate spinning stretching shell structure, the size of an opening is increased at the position matched with the expansion joint, the problem of oil leakage caused by defects such as air holes and sand holes of the aluminum casting is avoided, the shell strength is uniform, and the problem of weak local strength caused by shrinkage porosity of the aluminum casting is solved. By adopting the structure, the oil storage cabinet has excellent sealing performance and high shell strength, the realization of explosion-proof performance is promoted, the opening size of the connection matching position of the oil storage cabinet and the expander is increased, and the press-fit relation of all parts is optimized. The strength of the explosion-proof oil tank is far greater than the explosion pressure of the rupture disc, the oil tank cannot burst, the internal pressure of the oil tank is released from the top-most rupture disc, and the explosion-proof effect is achieved.
Further, the expansion joint is connected with an oil injection valve, and the oil injection valve is arranged on the side face of the upper flange of the expansion joint. The problem of the product evacuation oiling and top oil level limit the flange trompil size on the expander is solved, expander oiling valve structure sets up in the flange side department on the expander top, both is convenient for the product to evacuate the oiling, has increased the expander trompil size again, has link up the inside circulation passageway of expander.
Further, the bottom of expansion joint is connected with the oil storage cabinet through round bolt, has increased with oil storage cabinet area of contact, has opened the intercommunication passageway of expander and oil storage cabinet to firmly spacing the expander, avoid the expander to be pressed too big whole runaway.
Further, the ware body includes porcelain bushing and base, and the oil storage cabinet is located the top of porcelain bushing, is connected with binding post once on the oil storage cabinet, and one side of base is provided with the secondary outlet box.
Further, the base is connected with a grounding plate.
Further, the oil storage cabinet is provided with a lifting lug.
Furthermore, the sealing gasket is made of fluorosilicone rubber.
From the above technical scheme, the invention has the following advantages:
1. the top cover of the expander outer cover and the main body of the expander outer cover are in a split structure, and meanwhile, a movable opening is formed at the joint of the top cover and the outer cover;
2. the sealing structure among the connecting pieces is designed reasonably, and a fluorosilicone rubber sealing gasket with excellent performance is selected, so that the fluorosilicone rubber sealing gasket is suitable for the working temperature of minus 60 ℃ to plus 200 ℃, and the sealing performance of the product can be ensured to the greatest extent;
3. the top of the expander is additionally provided with an explosion-proof sheet, the explosion-proof sheet adopts an aluminum thin flange as a main body structure, a cross-shaped groove is formed in the air side, the maximum rated pressure of 0.06-0.1MPa can be born, when the bearing pressure is greater than the rated pressure, the explosion-proof sheet acts, and the part of the cross-shaped groove is cracked firstly, so that the internal pressure of a product is released rapidly;
4. the design of an expansion unit of the expander is optimized, so that the problems of evacuating and oiling products and limiting the opening size of a flange on the expander by the top oil level are solved, and the structure of the oil injection valve of the expander is arranged at the side surface of the flange at the top of the expander, so that the evacuating and oiling of the products are facilitated, the opening size of the expander is increased, and the internal circulation channel of the expander is penetrated; meanwhile, the bottom of the expander is connected with the oil storage cabinet by adopting a circle of bolts, so that the contact area between the expander and the oil storage cabinet is enlarged, a communication channel between the expander and the oil storage cabinet is opened, the expander is firmly limited, and the expander is prevented from being excessively compressed and flying integrally;
5. the oil storage cabinet adopts an industry-initiated aluminum plate spinning stretching shell structure, the size of an opening is increased at the position matched with the expansion joint, the problem of oil leakage caused by defects such as air holes and sand holes of an aluminum casting is avoided from the material, the shell strength is uniform, and the problem of weak local strength caused by shrinkage porosity of the aluminum casting is solved. By adopting the structure, the oil storage cabinet has excellent sealing performance and high shell strength, the realization of explosion-proof performance is promoted, the opening size of the connection matching position of the oil storage cabinet and the expander is increased, and the press-fit relation of all parts is optimized.
Drawings
In order to more clearly illustrate the technical solutions of the present invention, the drawings that are needed in the description will be briefly introduced below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of a front view structure of an embodiment of the present invention.
Fig. 2 is a schematic left-view structure of an embodiment of the present invention.
Fig. 3 is a schematic view of the structure of the reservoir and expander sections in an embodiment of the present invention.
Fig. 4 is a schematic structural view of an expansion joint according to an embodiment of the present invention.
Fig. 5 is a schematic view of the structure of the expander housing body and the housing prior to fastening, in accordance with an embodiment of the present invention.
In the figure, 1, an expander, 2, a primary wiring terminal, 3, a lifting lug, 4, an oil storage cabinet, 5, a porcelain bushing, 6, a grounding plate, 7, a secondary outlet box, 8, a base, 11, an expansion joint, 12, an upper flange, 13, a sealing gasket, 14, an explosion-proof piece, 15, a pressing ring, 16, an expander housing main body, 17, an expander housing top cover, 18, an oil injection valve, 19 and a loose joint.
Detailed Description
In order to make the objects, features and advantages of the present invention more obvious and understandable, the technical solutions of the present invention will be clearly and completely described below with reference to the drawings in this specific embodiment, and it is apparent that the embodiments described below are only some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, based on the embodiments in this patent, which would be within the purview of one of ordinary skill in the art without the particular effort to make the invention are intended to be within the scope of the patent protection.
As shown in fig. 1 to 3, this embodiment provides a high reliable explosion-proof formula oil-immersed current transformer, including the ware body, the upper portion of ware body is provided with oil storage cabinet 4, be provided with lug 3 on the oil storage cabinet 4, the upper portion of oil storage cabinet 4 is provided with expander 1, expander 1 includes expansion joint 11, expander dustcoat main part 16, expander dustcoat top cap 17, open on the upper portion of expansion joint 11 has the relief vent, it has explosion-proof piece 14 to seal on the relief vent, explosion-proof piece 14 passes through clamping ring 15 to be fixed, be provided with sealing washer 13 between clamping ring 15 and the expansion joint 11, sealing washer 13 adopts the fluorosilicone rubber material, the loose piece 19 has been seted up to the junction of expander dustcoat main part 16 and expander dustcoat top cap 17 for split type structure. Specifically, the ware body includes insulator 5 and base 8, and oil storage cabinet 4 is located the top of insulator 5, is connected with binding post 2 once on the oil storage cabinet 4, and one side of base 8 sets up secondary outlet box 7, still is connected with ground plate 6 on the base 8.
Wherein, be provided with two piece at least pressure release recesses on the rupture disk. Because be provided with two piece at least pressure release recesses on the rupture disk, the pressure release recess is more easily broken through than other parts of rupture disk, can realize carrying out the pressure release specificly through the pressure release recess when die cavity internal pressure is too big, and the pressure release recess is located the air side of rupture disk 14, outwards one side promptly, and the pressure release recess is cross groove structure. The maximum rated pressure of 0.06-0.1MPa can be born, when the bearing pressure is greater than the rated pressure, the explosion-proof sheet 14 acts, and the cross-shaped groove part is cracked first, so that the internal pressure of the product is released rapidly.
In addition, the oil storage cabinet 4 is an aluminum plate spinning stretching shell structure, the size of an opening is increased at the position matched with the expansion joint 11, the problem of oil leakage caused by defects such as air holes and sand holes of the aluminum casting is avoided, the shell strength is uniform, and the problem of weak local strength caused by shrinkage porosity of the aluminum casting is solved. By adopting the structure, the oil storage cabinet 4 has excellent sealing performance and high shell strength, the realization of explosion-proof performance is promoted, the opening size of the connecting and matching position of the oil storage cabinet 4 and the expander 1 is increased, and the press-fit relation of all parts is optimized. The strength of the explosion-proof oil tank is far greater than the explosion pressure of the rupture disc, the oil storage tank 4 cannot burst, so that the internal pressure of the product is released from the top-most rupture disc, and the explosion-proof effect is achieved. The expansion joint 11 is connected with the oil injection valve 18, the oil injection valve 18 is arranged on the side face of the upper flange 12 of the expansion joint 11, the problem that the product is pumped out and injected and the top oil is limited to the size of the opening of the upper flange 12 of the expander 1 is solved, the oil injection valve structure of the expander 1 is arranged on the side face of the upper flange 12 at the top of the expander 1, the product is pumped out and injected conveniently, the size of the opening of the expander 1 is increased, and the internal circulation channel of the expander 1 is penetrated. The bottom of the expansion joint 11 is connected with the oil storage cabinet 4 through a circle of bolts, so that the contact area with the oil storage cabinet 4 is enlarged, the communication channel between the expander 1 and the oil storage cabinet 4 is opened, the expander 1 is firmly limited, and the expander 1 is prevented from being excessively compressed and flying integrally.
The setting principle is as follows: when the electric power system is short-circuited or breakdown and other abnormal arc faults occur in equipment main insulation, the expander 1 moves to stretch at first, the expander 1 adopts an upper through structure and a lower through structure, so that pressure is conveniently and quickly transferred to the head of a product, when the expander 1 stretches to the top of the outer cover of the expander 1, the top cover 17 of the outer cover of the expander is stressed and flies up due to the split structure adopted by the outer cover of the expander 1, the expander 1 is ensured to stretch continuously, when the expander 1 stretches continuously to a certain degree, the internal pressure is increased to 0.06-0.1MPa, namely after the rated explosion pressure of a rupture disc, the rupture disc moves, and because at least two pressure relief grooves are formed in the rupture disc, the pressure relief grooves are easier to be used for relieving pressure when the internal pressure of a cavity is overlarge, meanwhile, the product oil storage cabinet 4 adopts an aluminum plate spinning stretching shell structure, the strength is high, the strength of the product is far higher than the explosion pressure of the rupture disc, the oil storage cabinet 4 cannot burst, and the internal pressure of the product is released from the top-most rupture disc, so that the explosion-proof effect is achieved.
The terms "upper," "lower," "outboard," "inboard," and the like in the description and in the claims of the invention and in the above figures, if any, are used for distinguishing between relative relationships in position and not necessarily for giving qualitative sense. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the invention described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprise" and "have," as well as any variations thereof, are intended to cover a non-exclusive inclusion.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (8)
1. The high-reliability explosion-proof type oil immersed current transformer is characterized by comprising a transformer body, wherein an oil storage cabinet is arranged at the upper part of the transformer body, an expander is arranged at the upper part of the oil storage cabinet and comprises an expansion joint, an expander outer cover main body and an expander outer cover top cover, a pressure relief opening is formed in the upper part of the expansion joint, an explosion-proof sheet is sealed on the pressure relief opening and is fixed through a pressing ring, a sealing gasket is arranged between the pressing ring and the expansion joint, the expander outer cover main body and the expander outer cover top cover are of a split structure, and a loose joint is formed at the joint of the expander outer cover main body and the expander outer cover top cover; when the internal pressure of the oil immersed type current transformer is suddenly increased, the expander starts to act and stretch, when the expander stretches to the topmost part of the expander outer cover, as the expander outer cover adopts a split structure, the top cover of the expander outer cover is stressed and flies up, the expander is ensured to continue stretching, when the expander continues stretching to a certain extent, namely after the rated burst pressure of the burst piece is reached, the burst piece acts, the pressure relief groove is broken through more easily than other parts of the burst piece, pressure relief can be realized through the pressure relief groove when the internal pressure of the cavity is overlarge, and the internal pressure is released from the burst piece at the topmost part; the expansion joint is connected with an oil injection valve, and the oil injection valve is arranged on the side surface of an upper flange of the expansion joint; the bottom of the expansion joint is connected with the oil storage cabinet through a circle of bolts.
2. The high-reliability explosion-proof type oil immersed current transformer according to claim 1, wherein at least two pressure relief grooves are formed in the rupture disc.
3. The high-reliability explosion-proof type oil immersed current transformer according to claim 2, wherein the pressure relief groove is positioned on the air side of the explosion-proof piece, and the pressure relief groove is of a cross groove structure.
4. The high-reliability explosion-proof type oil immersed current transformer according to claim 1, wherein the oil storage cabinet is an aluminum plate spinning stretching shell structure.
5. The high-reliability explosion-proof type oil immersed current transformer according to any one of claims 1 to 4, wherein the body comprises a porcelain sleeve and a base, the oil storage cabinet is positioned above the porcelain sleeve, the oil storage cabinet is connected with a primary wiring terminal, and one side of the base is provided with a secondary outlet box.
6. The high reliability explosion proof type oil immersed current transformer of claim 5, wherein the base is connected with a grounding plate.
7. The high-reliability explosion-proof type oil immersed current transformer according to claim 1, wherein the oil storage cabinet is provided with a lifting lug.
8. The high-reliability explosion-proof type oil immersed current transformer according to claim 1, wherein the sealing gasket is made of fluorosilicone rubber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210747192.7A CN115020072B (en) | 2022-06-29 | 2022-06-29 | High-reliability explosion-proof oil-immersed current transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210747192.7A CN115020072B (en) | 2022-06-29 | 2022-06-29 | High-reliability explosion-proof oil-immersed current transformer |
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| Publication Number | Publication Date |
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| CN115020072A CN115020072A (en) | 2022-09-06 |
| CN115020072B true CN115020072B (en) | 2023-11-03 |
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| CN202210747192.7A Active CN115020072B (en) | 2022-06-29 | 2022-06-29 | High-reliability explosion-proof oil-immersed current transformer |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115621024A (en) * | 2022-12-01 | 2023-01-17 | 江苏思源赫兹互感器有限公司 | Explosion-proof type expander |
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| EP3373313A1 (en) * | 2017-03-08 | 2018-09-12 | RITZ Instrument Transformers GmbH | Burst-proof power converter, in particular for railcar |
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2022
- 2022-06-29 CN CN202210747192.7A patent/CN115020072B/en active Active
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| CN115020072A (en) | 2022-09-06 |
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