CN204991305U - High -tension bushing of synthetic fiber and carbon fiber coiling - Google Patents
High -tension bushing of synthetic fiber and carbon fiber coiling Download PDFInfo
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- CN204991305U CN204991305U CN201520818063.8U CN201520818063U CN204991305U CN 204991305 U CN204991305 U CN 204991305U CN 201520818063 U CN201520818063 U CN 201520818063U CN 204991305 U CN204991305 U CN 204991305U
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Abstract
The utility model particularly relates to a high -tension bushing of synthetic fiber and carbon fiber coiling, including the tip voltage -sharing body (1), the electric capacity core body (2), flange (3), its characterized in that: insulating layer (5) of the electric capacity core body (2) do not have the twist yarn coiling by the synthetic fiber who soaks into insulation resin and solidification forms, and the electric capacity screen (6) of the electric capacity core body (2) does not have the twist yarn coiling by the carbon fiber that soaks into the resin and solidification forms. The utility model has the advantages that the conductivity of electric capacity screen is superior to does not greatly generate heat because of capacitance current in the semiconduction area, can not pollute insulation resin and reduce insulating properties, the resin can fully soak, no crack bubble. Insulating material adopts synthetic fiber not have the twist yarn, and the high -tension bushing's who makes electric property improves, and tg delta reduces to about 0.25%, product weight obviously reduces, is particularly useful for the high -tension bushing more than the superhigh pressure. Chemical reaction can not take place with SF6 gas for synthetic fiber, consequently the utility model discloses can directly be used for GIS or other SF6 gas -insulated high -Voltage electrical appliances.
Description
Technical field
The utility model belongs to High-Voltage Electrical Appliances field, is specifically related to one and is applied to the through walls or high voltage electric equipment (such as transformer, switchgear etc.) of transformer station through shell or for the synthetic fibers of oil gas isolation and the bushing of carbon fiber coiling.
Background technology
In electric power system, high voltage current－carrying conductor generally all will will use bushing through the shell of earthy wall or high voltage electric equipment; In transformer and the direct-connected structure of GIS switchgear, need with oil-gas isolated high-voltage sleeve pipe, being used for a transformer oil and SF6 gas barrier opens.
Current bushing is based on paper oil insulation structure, and its core is oil-impregnated paper insulation capacitor type core body.Oil-impregnated paper insulation capacitor type core body lays cable paper on copper pipe or copper rod, lays aluminium foil (being called capacitance plate), form a coaxial circles tubular capacitor when certain thickness; And then cable laying paper, re-lay the aluminium foil that length is shorter, form second coaxial circles tubular capacitor, due to this capacitor plate contraction in length but diameter increase, its capacitance can be designed as far as possible equal with the capacitance of capacitor before; Making length like this shortens gradually, capacitance is roughly equal, the ganged condenser of some, high voltage is radially shared more uniformly on each capacitor insulation, is also roughly evenly distributed on axial surface insulation.The dielectric strength of cable paper itself is very low, needs fully to be immersed in transformer oil, and this just needs a container.This container is made up of other accessories at a flange, two insulators and two ends.
The subject matter of oil-impregnated paper insulation bushing is sealing and leakage of oil.Because transformer oil is wherein that insulation is necessary, therefore leakage of oil not only affects the attractive in appearance of transformer station, also directly affects the security of operation of equipment.Seal failure, insulation can be made moist, and therefore regulations stipulate all will extract oil sample every year and tests, and loss of outage is large, and maintenance workload is also very large.
In order to solve the problem of oilpaper sleeve pipe, the fiberglass bushing having had dry type non-maintaining in recent years occurs, such as China Patent No. 01138797.1 discloses a kind of dry type composite sheath bushing and production method, main insulating layer all presses pole plate and dip-coating to have the glass fiber material alternate intervals of epoxy resin to arrange and the multilayer of combining closely is connected pure solid concentric column insulating barrier by semicoductor capacitor, insulating coating and branch sleeve also with main insulating layer outside close proximity, production method comprises the steps: semiconductor tape with epoxy fibreglass wet method coiling moulding process, dip-coating has the coiling sizing of the glass fiber material alternate intervals of epoxy resin ground to make main insulating layer on conducting rod, ground floor is that semicoductor capacitor all presses pole plate, most last layer is the glass fibre that dip-coating has epoxy resin, solidified and Surface Machining is carried out to main insulating layer, then being fixedly connected with sleeve, installing insulating coating, pressure equalizing cover and binding post.This patent specification is thought, this dry type composite sheath bushing containing any oil or gas, not completely avoid leakage of oil, gas leakage and hidden peril of explosion; Volume is little, lightweight, should not damage, be convenient to transport and install; Production technology is simple, cost is low.
Above-mentioned dry type composite sheath bushing scheme is that of bushing non-oil ultra high vacuum system benefits our pursuits.But, also exist significantly not enough in this technical scheme, mainly:
1, the capacitance plate heating problem made of semi-conductive tape is large, and easily causing insulation by heat ageing, cause failure of insulation to puncture, this problem is reflected on ultra high voltage transformer bushing especially obvious.Tradition oil-impregnated paper insulation bushing adopts metal capacitance screen (punching or the aluminium foil that do not punch), and above-mentioned dry type composite sheath bushing adopts conducting paper to do capacitance plate, its conductivity only have metallic conductor ten thousand/even 1,000,000/, therefore heating problem can not be ignored.Especially true to ultra high voltage transformer bushing.Because ultra high voltage transformer bushing capacitance current is comparatively large, and will carry out induced over voltage withstand test together with transformer body, the high voltage frequency of use can reach 250Hz, is 5 times of power frequency 50Hz.Therefore, 5 times when the electric current flowing through capacitance plate is industrial frequency withstand voltage, hundreds of mA can be reached even close to 1A, and heating is directly proportional during inducting-voltage proof to current squaring.Show with 500mA current testing, metal capacitance screen does not measure temperature rise substantially, but the temperature rise of semi-conductive tape capacitance plate can reach more than 200K.If add that transformer runs maximum temperature (90 DEG C), reach 290 DEG C near capacitance plate, certainly will damage epoxy resins insulation.
2, semi-conductive tape is made up of the black conductive paint of cable paper tape impregnated carbon, in bushing winding process, semi-conductive tape runs into High temp. epoxy resins can discharge partially conductive carbon black, pollutes insulating resin, its insulation property being reduced, must insulation thickness be increased for reaching requirement of withstand voltage.Therefore, the actual weight of dry type composite sheath bushing is more much bigger than the ideal dimensions of patent formula.
3, semi-conductive tape flooded conductive paint, and be therefore not easy by resin impregnated in sleeve pipe winding process, namely wettability is bad, and the bushing after solidification easily in generation crack, semi-conductive tape place, affects product quality, causes waste product.
4, as the glass fibre of resin tooth material, it is polar material, and electrical strength is not best, and its dielectric constant is about 4-6, and medium wasting factor tgδ is approximately 0.3%.Therefore, the capacitance of the bushing made is comparatively large, and this is also one of factor causing semi-conductive tape capacitance plate to generate heat; The tg δ of the bushing made about 0.4%, close to the limit value (0.5%) that GB allows oil-paper bushing.
5, the density of glass fibre is at 2g/cm
3above, and oil-paper density is slightly less than 1g/cm
3, therefore the capacitor type core body of the oil-paper bushing that core---capacitor type core body---actual specific of this dry type composite sheath bushing is traditional wants recuperation many.Although do not have insulator, conservator etc., its total weight does not alleviate too much than traditional oil-paper bushing, still heavier.
6, fiberglass products has a significant limitation, can not be directly used in SF6 gaseous environment exactly, this is because SF6 gas is to the SiO in glass
2there is corrosiveness.That is the fiberglass bushing of prior art can not be used in GIS device for switching.We know, because gas insulating distribution apparatus (i.e. GIS) is also referred to as fully closed combined electric unit, it significantly can reduce floor space, and fail safe, reliability all higher than open type distribution device, so the transformer station's great majority more than developed country and China's superhigh pressure are GIS transformer station.Therefore, the scope of application of the fiberglass bushing of prior art is very limited.
Utility model content
The purpose of this utility model to overcome the deficiencies in the prior art, provides the bushing of a kind of synthetic fibers and carbon fiber coiling, and its electric property is high, and tg δ is reduced to about 0.25%; Product weight obviously reduces, and is particularly useful for the bushing of more than superhigh pressure, can be directly used in GIS or other SF6 gas insulated high voltage electrical equipment.
The utility model is achieved by the following technical solution:
The i.e. bushing of a kind of synthetic fibers and carbon fiber coiling, comprise end grading body, capacitor type core body, flange, it is characterized in that: the insulating barrier of capacitor type core body is by infiltrating the synthetic fibers zero twisted yarn coiling of insulating resin and solidification forms, and the capacitance plate of capacitor type core body is by infiltrating the carbon fiber zero twisted yarn coiling of resin and solidification forms.
Synthetic fibers of the present utility model preferably but be not limited to polypropylene fiber or polyster fibre.
Capacitance plate of the present utility model by n layer infiltrate resin the coiling of carbon fiber zero twisted yarn and solidification form, number of plies n>1.
On adjacent insulating barrier of the present utility model and capacitance plate contact-making surface, the angle in the coiling direction of the coiling direction of carbon fiber zero twisted yarn and the synthetic fibers zero twisted yarn of adjacent layer is not equal to 0 ° and is also not equal to 180 °, in same capacitance plate, the angle in the coiling direction of the coiling direction of carbon fiber zero twisted yarn and the carbon fiber zero twisted yarn of adjacent layer is not equal to 0 ° and is also not equal to 180 °.
Respectively there is a carbon paper ring at the two ends of the capacitance plate of carbon fiber zero twisted yarn of the present utility model coiling, and carbon paper ring and carbon fiber zero twisted yarn close contact link together.
When the utility model makes, first prepare a metal tube or metal bar (its outer surface is commonly referred to 0 screen).Metal tube or metal bar coil through the synthetic fibers zero twisted yarn that insulating resin infiltrates.The yarn that weaving uses typically refers to through twisting with the fingers (twisting) tight fiber or silk, and the object of twisting mainly increases mechanical strength.Here will use zero twisted yarn, although its intensity is not if any twist yarn, effect of impregnation ratio has twist yarn well a lot, and after twisting, the very difficult infiltration of resin is thorough, and there is bubble, electrical strength is poor.Cut off yarn when the certain number of plies of coiling or certain thickness synthetic fibers zero twisted yarn, synthetic fibers strengthen resin insulating barrier (hereinafter referred to as insulating barrier) and have just carried out.Then coiling capacitance plate.The carbon fiber zero twisted yarn that resin infiltrates is coiled through at ready-made insulating layer, notice that the direction of insulating barrier last layer of synthetic fibers zero twisted yarn that the direction of carbon fiber zero twisted yarn is good with coiling can not be identical or contrary, that is the angle in the direction of the direction of carbon fiber and the synthetic fibers of adjacent layer is not equal to 0 ° and is also not equal to 180 °; The object done like this avoids carbon fiber to embed among the gap of synthetic fibers, causes dielectric strength to reduce.
After this capacitance plate is carried out, it and previous capacitance plate form a coaxial circles tubular capacitor.Then, again with the next insulating barrier of the synthetic fibers zero twisted yarn coiling infiltrated through resin, notice that the direction of last one deck carbon fiber of the capacitance plate that the direction of synthetic fibers is good with coiling can not be identical or contrary, namely the angle in the direction of the direction of previously described carbon fiber and the synthetic fibers of adjacent layer is not equal to 0 ° and is also not equal to 180 ° (object done like this avoids carbon fiber to embed among the gap of synthetic fibers, cause dielectric strength to reduce).Go out the shorter capacitance plate of length with the carbon fiber zero twisted yarn coiling infiltrated through resin again, form second coaxial circles tubular capacitor.By that analogy, just can produce that length shortens gradually, capacitance roughly equal, the ganged condenser of some.In order to ensure that last layer capacitance plate also can be equally compacted with the capacitance plate of inside, can be wound around the end shield external insulation layer of certain number of plies outside end shield, the insulating barrier between winding method shields with inside is identical.So just made the semi-finished product of a bushing capacitor type core body, be exactly the capacitor type core body of the bushing of synthetic fibers and carbon fiber coiling after overcuring and sharp processing.
On the capacitor type core body of bushing, the accessory such as mounting end grading body, flange, namely forms basic bushing.Can increase other accessory according to different needs, such as oil-gas disrance sleeve needs to increase contact, fingertip, and bushing shell for transformer needs at one end to increase insulator or compound sleeve, and wall bushing then needs all to install insulator or compound sleeve at two ends.
When it should be noted that coiling capacitance plate, the termination of carbon fiber zero twisted yarn can not be exposed, to avoid point discharge.In order to increase reliability and avoid point discharge, the end of each capacitance plate is at least formed by the carbon fiber zero twisted yarn coiling of two-layer (or more than two-layer), namely the termination of carbon fiber yarn to the third side of capacitance plate to tucking in into.Each capacitance plate of converting like this is made up of the carbon fiber being at least greater than one deck (not containing one deck), such as 1.2 layers or 2 layers etc.The direction of adjacent two layers carbon fiber can not be identical or contrary, and namely angle is not equal to 0 ° and is also not equal to 180 °.Improve as one of the present utility model, also each capacitance plate can be divided into three sections, make by carbon fibre material.One section, the centre of each capacitance plate is still carbon fiber zero twisted yarn, and two ends respectively increase a carbon paper ring be made up of the sheeting such as carbon fiber paper or carbon fiber felt; Carbon fiber zero twisted yarn accounts for capacitance plate total length larger proportion, and two carbon paper rings account for shorter ratio.Carbon paper ring wants the termination that can shield carbon fiber yarn, and ensures to link together with carbon fiber yarn close contact.In general, the length 30-100mm of each carbon paper ring.
The utility model has the following advantages compared with existing technical scheme:
1, capacitance plate is that carbon fibre material makes, and good conductivity, can not generate heat because of capacitance current;
2, capacitance plate material is carbon fiber yarn, can not pollute insulating resin, does not reduce insulation resin performance;
3, the synthetic fibers no matter insulated, or the carbon fiber of conduction all adopts zero twisted yarn, and resin can fully infiltrate;
The capacitance of the bushing 4, selecting the good synthetic fibers of electrical strength (such as polypropylene fibre zero twisted yarn) to make reduces 20%-35%, tg δ than the capacitance of the fiberglass bushing of prior art and is reduced to about 0.25%;
5, the density of synthetic fibers is generally less than the glass fibre of existing scheme (polypropylene fiber that such as density is minimum is 0.91g/cm
3, the half of not enough glass fibre), the weight of the bushing made obviously reduces, and this is for just important bushing more than inherently heavier superhigh pressure.
6, can not there is chemical reaction in synthetic fibers and SF6 gas, and the bushing of therefore the utility model synthetic fibers and carbon fiber coiling can be directly used in GIS or other SF6 gas insulated high voltage electrical equipment.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model;
Fig. 2 is the enlarged diagram in I portion in Fig. 1;
Fig. 3 is the structure for amplifying schematic diagram of in Fig. 1 II;
Fig. 4 is the winding process expanded view of adjacent two layers zero twisted yarn.
In figure: the grading body of 1-end; 2-capacitor type core body; 3-flange; 4-metal tube or metal bar; 5-insulating barrier; 6-capacitance plate; 7-end shield external insulation layer; 8-carbon paper ring; 11-zero twisted yarn, 12-zero twisted yarn.
Embodiment
See Fig. 1, Fig. 2, Fig. 3, the bushing of the utility model synthetic fibers and carbon fiber coiling comprises: end grading body 1, capacitor type core body 2, flange 3 etc.The center of capacitor type core body 2 is a metal tube or metal bar 4, metal tube or excellent 4 coils through the certain number of plies of synthetic fibers zero twisted yarn or the certain thickness of insulating resin infiltration, form synthetic fibers and strengthen resin insulating barrier (being called for short insulating barrier 5), insulating barrier 5 coils through the carbon fiber zero twisted yarn that resin infiltrates, form carbon fibre resin layer (being called for short capacitance plate 6), so alternately be wound around, the end shield external insulation layer 7 of certain number of plies is wound around in the outside of most end layer capacitance screen, the semi-finished product of the capacitor type core body of the bushing of synthetic fibers and carbon fiber coiling are so just made, it is exactly required capacitor type core body 2 after overcuring and sharp processing.The accessory such as mounting end grading body 1, flange 3 on capacitor type core body 2, namely forms the bushing of synthetic fibers and carbon fiber coiling.According to the concrete use occasion of bushing, can increase other accessory, such as oil-gas disrance sleeve needs to increase contact, fingertip, and bushing shell for transformer needs at one end to increase insulator or compound sleeve, and wall bushing then needs all to install insulator or compound sleeve at two ends.
Fig. 4 is the expanded view of technique for coiling, in Fig. 4, zero twisted yarn 11 represents the direction P of one deck zero twisted yarn (carbon fiber yarn or synthetic fiber yarn) wound, zero twisted yarn 12 represents the direction Q of the warp layer (carbon fiber yarn or synthetic fiber yarn) preparing coiling, direction P can not be identical or contrary with direction Q, and namely the angle of direction P and direction Q is not equal to 0 ° and is also not equal to 180 °.Several situation is divided to be described as follows:
1. the P direction that zero twisted yarn 11 represents is the direction of last layer of synthetic fibers zero twisted yarn of certain insulating barrier 5 that coiling is good, and the Q direction that zero twisted yarn 12 represents is the direction of the ground floor carbon fiber zero twisted yarn of the capacitance plate 6 preparing coiling;
2. the P direction that zero twisted yarn 11 represents is the direction that certain capacitance plate 6 in coiling has wound last one deck carbon fiber zero twisted yarn of part, and the Q direction that zero twisted yarn 12 represents is the direction that this capacitance plate 6 prepares new one deck carbon fiber zero twisted yarn of coiling;
3. the P direction that zero twisted yarn 11 represents is the direction of last one deck carbon fiber zero twisted yarn of certain capacitance plate 6 that coiling is good, and the Q direction that zero twisted yarn 12 represents is the direction of the ground floor synthetic fibers zero twisted yarn of the insulating barrier 5 preparing coiling.
Improve as one of the present utility model, also capacitance plate 6 can be divided into three sections.One section, the centre of each capacitance plate is still the coiling of carbon fiber zero twisted yarn, and two ends respectively increase a carbon paper ring 8 be made up of the sheeting such as carbon fiber paper or carbon fiber felt; Carbon fiber zero twisted yarn accounts for capacitance plate total length larger proportion, and two carbon paper rings 8 account for shorter ratio.Carbon paper ring 8 wants the termination that can shield carbon fiber yarn, and ensures to link together with carbon fiber yarn close contact.In general, the length of carbon paper ring 8 is at 30-100mm.
For the wall bushing making a 10kV in detail embodiment of the present utility model is described in detail below.
First a selected brass bar, diameter of phi 40mm, length 1000mm; Insulating resin ring selection epoxy resins Ε 51 (intermediate temperature setting system); Polypropylene fiber zero twisted yarn (trade name is polypropylene fibre zero twisted yarn) selected by synthetic fibers.
First screen: the polypropylene fibre zero twisted yarn 1.6mm coiling through epoxy resin infiltration on brass bar is thick, form first insulating barrier 5, insulating barrier 5 coils through the carbon fiber zero twisted yarn 2 layers that epoxy resin infiltrates, and form first capacitance plate 6, the total length of capacitance plate 6 is 600mm.
Second screen: on ready-made first capacitance plate 6, the polypropylene fibre zero twisted yarn 1.6mm coiling through epoxy resin infiltration is thick, form second insulating barrier 5, insulating barrier 5 coils through the carbon fiber zero twisted yarn 2 layers that epoxy resin infiltrates, form second capacitance plate 6, the total length of capacitance plate 6 is 500mm.
3rd screen: on ready-made second capacitance plate 6, the polypropylene fibre zero twisted yarn 1.6mm coiling through epoxy resin infiltration is thick, form the 3rd insulating barrier 5, insulating barrier 5 coils through the carbon fiber zero twisted yarn 2 layers that epoxy resin infiltrates, form the 3rd capacitance plate 6, the total length of capacitance plate 6 is 400mm.
3rd screen is end shield, and end shield is bound a 1.5mm
2insulation annealed copper wire, this insulated conductor will use as end shield lead-out wire.Be wound around the end shield external insulation layer 7 that 2mm is thick in the outside of end shield again, so just made the semi-finished product of the capacitor type core body 2 of the bushing of synthetic fibers and carbon fiber coiling, be exactly required capacitor type core body 2 after overcuring and sharp processing.The accessory such as mounting end grading body 1, flange 3 on capacitor type core body 2, namely forms the bushing of synthetic fibers and carbon fiber coiling.According to the actual conditions of wall bushing, two ends install silastic material and full skirt respectively, often hold five full skirts, dry arcing distance 210mm, creep distance 480mm.
Claims (5)
1. the bushing of synthetic fibers and carbon fiber coiling, comprise end grading body (1), capacitor type core body (2), flange (3), it is characterized in that: the insulating barrier (5) of capacitor type core body (2) is by infiltrating the synthetic fibers zero twisted yarn coiling of insulating resin and solidification forms, and the capacitance plate (6) of capacitor type core body (2) is by infiltrating the carbon fiber zero twisted yarn coiling of resin and solidification forms.
2. the bushing of synthetic fibers according to claim 1 and carbon fiber coiling, is characterized in that synthetic fibers are polypropylene fiber or polyster fibre.
3. the bushing of synthetic fibers according to claim 1 and carbon fiber coiling, is characterized in that capacitance plate (6) is also solidified by the carbon fiber zero twisted yarn coiling of n layer infiltration resin and forms, number of plies n>1.
4. the bushing of the synthetic fibers according to claim 1 or 3 and carbon fiber coiling, it is characterized in that on adjacent insulating barrier (5) and capacitance plate (6) contact-making surface, the angle in the coiling direction of the coiling direction of carbon fiber zero twisted yarn and the synthetic fibers zero twisted yarn of adjacent layer is not equal to 0 ° and is also not equal to 180 °, in same capacitance plate (6), the angle in the coiling direction of the coiling direction of carbon fiber zero twisted yarn and the carbon fiber zero twisted yarn of adjacent layer is not equal to 0 ° and is also not equal to 180 °.
5. the bushing of the synthetic fibers according to claim 1 or 3 and carbon fiber coiling, it is characterized in that respectively there is a carbon paper ring (8) at the two ends of the capacitance plate (6) of carbon fiber zero twisted yarn coiling, carbon paper ring (8) and carbon fiber zero twisted yarn close contact link together.
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| CN201520818063.8U CN204991305U (en) | 2015-10-20 | 2015-10-20 | High -tension bushing of synthetic fiber and carbon fiber coiling |
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| CN201520818063.8U CN204991305U (en) | 2015-10-20 | 2015-10-20 | High -tension bushing of synthetic fiber and carbon fiber coiling |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117059352A (en) * | 2023-10-13 | 2023-11-14 | 搏世因（北京）高压电气有限公司 | Glue-immersed fiber capacitive dry sleeve and manufacturing method thereof |
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2015
- 2015-10-20 CN CN201520818063.8U patent/CN204991305U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117059352A (en) * | 2023-10-13 | 2023-11-14 | 搏世因（北京）高压电气有限公司 | Glue-immersed fiber capacitive dry sleeve and manufacturing method thereof |
| CN117059352B (en) * | 2023-10-13 | 2024-01-30 | 搏世因（北京）高压电气有限公司 | Glue-immersed fiber capacitive dry sleeve and manufacturing method thereof |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: High voltage casing wound with synthetic fiber and carbon fiber Effective date of registration: 20211129 Granted publication date: 20160120 Pledgee: Industrial Bank Co., Ltd. Zibo Branch Pledgor: SHANDONG CHENXIANG ELECTRICAL EQUIPMENT CO.,LTD. Registration number: Y2021980013444 |