CN213424623U - Winding cable and transformer - Google Patents
Winding cable and transformer Download PDFInfo
- Publication number
- CN213424623U CN213424623U CN202021806112.3U CN202021806112U CN213424623U CN 213424623 U CN213424623 U CN 213424623U CN 202021806112 U CN202021806112 U CN 202021806112U CN 213424623 U CN213424623 U CN 213424623U
- Authority
- CN
- China
- Prior art keywords
- transformer
- conductor
- winding
- layer
- winding cable
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Organic Insulating Materials (AREA)
Abstract
The utility model provides a winding cable, the winding cable includes conductor, semi-conductive shielding layer and silicon rubber insulating layer from inside to outside in proper order, can be able to bear 200 ℃ of high temperature and-45 ℃ of low temperature performance, has good ozone aging resistance, electrical insulation and physical and mechanical properties, and the winding cable can be used as the winding coil in transformer and the motor; when the high-temperature-resistant high-voltage transformer winding is used as a winding coil of a transformer, the thicknesses of the thin semi-conducting layer and the insulating layer are controlled to meet the space requirement of the transformer, the voltage grade of the transformer can reach 66kV, the electric field distribution is uniform, the high temperature resistance reaches 200 ℃, the manufacturing process is simple, the space is saved, the environment is protected, and the high-temperature-resistant high-voltage transformer winding has a good application prospect.
Description
Technical Field
The utility model relates to a power supply unit technical field especially relates to transformer technical field, in particular to winding cable and transformer.
Background
The transformer is used as the main equipment of the power supply system, and the main function is to reduce the loss on a transmission line and improve the transmission efficiency by increasing and decreasing the voltage. In recent years, with the rapid development of urban construction and large-scale industrial and mining industry, high-rise buildings, underground buildings, airports, business centers, thermal power plants and hydraulic power plants are continuously increased, the requirements on the voltage grade, the rated capacity, the fire resistance, the explosion resistance and the environmental protection performance of the transformer are more and more strict, and the traditional cast type and non-encapsulated insulating varnish impregnated dry type transformer cannot meet the increasing market demand and the strict environmental requirement, so that a novel dry type transformer is urgently needed to meet the market demand.
The stable operation voltage class of the existing dry type transformer is 35kV, and the requirement of the increasing power pressure on the service efficiency of the transformer cannot be met. Although 66kV dry-type power transformer has application, because the technical development of transformer is not perfect enough, in recent years 66kV dry-type power transformer accident frequently occurs, seriously influences the safe operation of electric wire netting and the reliability of power supply. The existing dry-type transformer also has the problems of partial discharge and cracking, so that the transformer cannot work normally and even has explosion accidents. In addition, the insulating material or auxiliary material used by the dry-type transformer contains more polymers and halogens, and a large amount of heat, smoke and toxic gas can be released during combustion, so that the life and property safety of people is endangered.
Cable type dry transformers are receiving attention because of their many advantages, high voltage class, large capacity, uniform electric field, safe and reliable operation, etc. The cable type dry transformer is a completely novel dry transformer, applies the cable technology to the transformer, subverts the traditional transformer structure, and is a new star of the dry transformer.
At present, the research and development of the cable type dry transformer is in the initial stage, and there is not enough practical operation experience, so that the intensive research and development of the coil characteristics of the cable and the manufacturing process are required.
At present, only XLPE cables for high-voltage dry type transformers are reported when winding cables for transformers are put into the market for operation. The XLPE cable for the high-voltage dry-type transformer has the following structure: the conductor of the innermost layer is surrounded by a semiconducting layer, then the crosslinked polyethylene solid insulating medium, and the outermost layer is also the semiconducting layer. The semi-conducting layer can effectively homogenize an electric field, weaken partial discharge and improve the safety of the transformer, but an XLPE cable type dry-type transformer has fewer market application examples and insufficient actual operation experience, and an XLPE cable has the defects of no high temperature resistance, 90 ℃ of the highest working temperature, large occupied space, insufficient flexibility and the like, so that the development space of the XLPE cable is limited.
At present, related reports on winding cables exist in China.
CN1484257A discloses a winding transformer of a double-layer cable for winding and a harmonic suppression cable, the double-layer cable comprises an inner conductor, a first semiconductive layer, a first insulating layer, a second semiconductive layer, an outer conductive layer, a third semiconductive layer, a second insulating layer and a fourth semiconductive layer from inside to outside, and a grounding conductive belt is arranged outside the fourth semiconductive layer, but the cable is only suitable for a winding wire for harmonic suppression in a low-voltage distribution network and cannot be used in a 66kV transformer.
CN2857163Y discloses a from inside to outside in proper order including first conductive core, first interior semiconduction shielding layer, first insulating layer, first outer semiconduction shielding layer, first conductive core is twisted by many single conductors of different materials and is the range of concentric layer, has central conductor in the middle of the first conductive core, and central conductor encircles multilayer single conductor outward, and the electric conductivity of inner layer single conductor is lower than the electric conductivity of outer single conductor, and the cable can work in strong magnetic field for a long time stably, and its eddy current loss is little, has energy-efficient advantage, but the insulating material that this cable used is XLPE, low density polyethylene, high density polyethylene etc. the temperature resistant grade is the highest 90 ℃, can't satisfy the high temperature requirement of 200 ℃ of high voltage transformer, and bending property is relatively poor, uses the restriction.
CN100365738C discloses a medium voltage winding cable, relates to a high soft ethylene propylene rubber insulation medium voltage cable, can be used for generator, motor and transformer winding wire, but the cable temperature resistant grade is the highest 90 ℃, can't satisfy the high temperature resistant requirement of 200 ℃ of high voltage transformer, in addition the rated voltage is only 10kV, can't satisfy the operation requirement of 66kV transformer.
In summary, it is technically difficult for the existing dry-type transformer to make the transformer capacity large, the voltage high, and it is not environment-friendly, so the cable-type dry-type transformer gradually receives attention, but the development of the existing cable-type dry-type transformer is severely limited due to insufficient mechanical performance and high temperature resistance of the cable.
Therefore, it is urgently needed to develop a new winding cable for use in a dry-type transformer to expand the application prospect of the dry-type transformer.
SUMMERY OF THE UTILITY MODEL
In view of the problems in the prior art, the utility model provides a winding cable, the winding cable includes conductor, semi-conductive shielding layer and silicon rubber insulating layer from inside to outside in proper order, the silicon rubber insulating layer has good mechanical properties and electrical insulation performance, has better heat conductivity simultaneously, can resistant ozonization and have the mould proof; the high-voltage dry type transformer can be used as a winding coil of a 66kV dry type transformer, and can solve the problems that the conventional dry type transformer is insufficient in voltage grade or the high-voltage dry type transformer is stable, environment-friendly and difficult to meet the requirements in safety.
To achieve the purpose, the utility model adopts the following technical proposal:
in a first aspect, the present invention provides a winding cable, which comprises a conductor, a semi-conductive shielding layer and a silicon rubber insulating layer in sequence from inside to outside; the semi-conductive shielding layer is coated on the outer surface of the conductor; the silicon rubber insulating layer is coated on the outer surface of the semi-conductive shielding layer; the thickness of the silicon rubber insulating layer is 0.8-1.5 mm.
The utility model discloses an adopt the cable construction of conductor, semi-conductive shielding layer and silicon rubber insulating layer, can be able to bear or endure 200 ℃ high temperature and-45 ℃ low temperature performance, have good ozone aging resistance and mould proof nature, improve the tolerance of cable in high pressure environment.
The utility model discloses in the thickness of silicon rubber insulating layer is 0.8 ~ 1.5mm, for example can be 0.8mm, 0.9mm, 1.0mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm or 1.5mm etc..
Preferably, the conductor comprises at least 19 annealed copper wires stranded and compacted.
Preferably, the conductor is a type 2 compacted stranded round copper conductor.
Conductor adopts to sticiss the transposition formation including 19 piece at least annealing copper line 2 nd class, and its constitution, performance and outward appearance should accord with the regulation of GB/T3956 standard 2 nd conductor, and conductor direct current resistance is higher than GB/T3956 standard requirement, conductor surface bright and clean, the insulating burr of not damaged, sharp limit and arch or cracked single line.
Avoid the existence of burr when selecting the wire, select for use high-quality round copper line. On one hand, when voltage is applied to the transformer winding, an electric field is concentrated on a part of the conductor with burrs, and point discharge is formed. On the other hand, the tip of the conductor may pierce the insulating layer and cause partial discharge. The wire bundling machine and the frame stranding machine are adopted for conductor production, the problems of filament breakage and strand jumping of monofilaments are effectively avoided, the outer diameter of the conductor is stable, the stranded conductor has no defects of sharp corners, burrs and the like, and the wire drawing and stranded wires can adopt the existing die and need to be reconfigured and matched.
Preferably, the semiconductive shield layer is a silicone rubber semiconductive layer.
Preferably, the silicone rubber semi-conductive layer is a silicone rubber containing carbon black.
Silicon rubber semi-conducting layer and conductor contact, closely surround around the conductor, constitute by the silicon rubber that thoughtlessly has carbon black, graphite alkene or carbon nanotube, can balanced electric field, prevent partial discharge and reduce the loss.
The insulation material of the silicone rubber insulation layer comprises, by mass, 100 parts of methyl vinyl silicone rubber raw rubber, 100-150 parts of a heat-conducting filler group, 5-15 parts of a reinforcing filler, 3-8 parts of a structural control agent, 1-2 parts of a vulcanizing agent and 1.5-2.5 parts of an auxiliary agent.
Preferably, the heat-conducting filler group comprises heat-conducting fillers formed by compounding aluminum oxide and boron nitride.
Preferably, the average particle size of the heat conductive filler is 0.1 to 20 μm, and may be, for example, 0.1 μm, 0.2 μm, 0.5 μm, 1 μm, 2 μm, 3 μm, 4 μm, 5 μm, 6 μm, 7 μm, 8 μm, 9 μm, 10 μm, 11 μm, 12 μm, 13 μm, 14 μm, 15 μm, 16 μm, 17 μm, 18 μm, 19 μm, or 20 μm.
Preferably, the heat conducting filler is formed by combining heat conducting fillers with average particle diameters of 6 microns and 10 microns, so that the particles are tightly stacked to form a heat conducting path, and the optimal heat conducting effect is achieved.
Preferably, the thickness of the semiconductive shielding layer is 0.4-0.8 mm, and may be, for example, 0.4mm, 0.45mm, 0.5mm, 0.55mm, 0.6mm, 0.65mm, 0.7mm, 0.75mm, 0.8mm, or the like.
Preferably, the cross-sectional area of the conductor is designed according to the effective cross-sectional area.
The cross-section of conductor calculates according to effective sectional area design, compares the conductor of current conventionality and has less resistance.
Preferably, the effective sectional area of the conductor is 70-95 mm2For example, it may be 70mm or 75mm2、80mm2、85mm2、90mm2Or 95mm2Preferably 75mm2。
Preferably, the conductor has a resistance of 0.270 to 0.190 Ω/km at 20 ℃, for example, 0.268 Ω/km, 0.225 Ω/km, 0.214 Ω/km, 0.203 Ω/km, 0.193 Ω/km, etc.
The preparation method of the silicon rubber insulating layer in the winding cable comprises the following steps:
(1) adding raw methyl vinyl silicone rubber to a roller of a two-roller open mill, wrapping the roller, sequentially adding a reinforcing filler, an auxiliary agent, a heat-conducting filler group and a structural control agent, uniformly mixing for the first time, then adding a vulcanizing agent, and uniformly mixing for the second time to obtain a rubber compound;
wherein, the weight percentage is that 100 parts of methyl vinyl silicone rubber crude rubber, 100-150 parts of heat conducting filler group, 5-15 parts of reinforcing filler, 3-8 parts of structural control agent, 1-2 parts of vulcanizing agent and 1.5-2.5 parts of auxiliary agent;
(2) and (2) after the vulcanizing press is preheated, primarily vulcanizing the rubber compound in the step (1) in the vulcanizing press at 110-130 ℃ and 8-12 MPa for 8-12 min, taking out the rubber compound, and secondarily vulcanizing the rubber compound in an oven at 200 ℃ for 4h to obtain the silicon rubber insulating layer.
The utility model discloses it is right the preparation process of cable does not have special restriction, can adopt any step and the flow that can be used to winding cable preparation that technical personnel in the field are familiar, also can adopt and carry out the preparation method after improving based on prior art, and no longer describe herein.
The test procedure of the cable finished product is strictly checked according to the corresponding raw material inspection standard and the process inspection standard.
Conductor control: detecting each coiled strand after the bunching, wherein the number, the pitch, the outer diameter and the like of the twisted monofilament are included, and the twisted monofilament can be transferred to a complex twisting process after the strand is qualified; and (4) sampling the head and the tail of each twisted disc conductor, and transferring to a cross-linking process after the resistance, the outer diameter, the surface quality and the like of the conductor are qualified.
Insulation control: sampling detection is carried out on each insulating wire core of the lower disc, and the sampling detection mainly comprises the insulating thickness, the core deviation condition and the thermal elongation performance, and the next procedure can be switched into after all indexes are qualified.
Insulating control points: plasticizing quality; color; insulating minimum average thickness; an insulating maximum average thickness; eccentricity; the maximum outer diameter.
In a second aspect, the present invention provides a transformer comprising the winding cable of the first aspect.
Preferably, the transformer comprises a transformer insulation formed by pouring a silicon rubber insulation layer on the outer side of the winding cable.
Preferably, the transformer is a dry transformer.
Preferably, the voltage class of the dry-type transformer is 66 kV.
The transformer that the second aspect provided is through adopting the utility model winding cable put and the fracture problem as the winding coil, the office of having solved current transformer, and contain more polymer and halogen in the relative current insulating material, the utility model discloses can not emit a large amount of smog and toxic gas during the burning, environmental protection more can have the stability of preferred under high level voltage (66 kV).
The utility model discloses the second aspect the transformer is in traffic hub such as high-rise building, underground building, airport or commercial center, fire prevention and explosion-proof occasions such as thermal power plant or hydroelectric power plant, and the usage in areas such as coastal humid area, perishable area, severe cold area or high temperature area is extensive, and application prospect is wide.
Compared with the prior art, the utility model discloses following beneficial effect has at least:
(1) the winding cable provided by the utility model can be used in a 66kV dry-type transformer, improves the safety of the 66kV dry-type transformer and the reliability of power supply, is high temperature resistant up to 200 ℃, is flame-retardant and fire-resistant, can be installed in crowded places, and meets the requirements of high safety, high reliability and high environmental protection;
(2) the winding cable provided by the utility model adopts the silicon rubber insulating layer, so that the mechanical property, the heat conducting property and the temperature resistance are better;
(3) the utility model provides a silicon rubber insulating layer thickness in the winding cable selects at 0.8 ~ 1.5mm, practices thrift the transformer space.
Drawings
Fig. 1 is a schematic view of a winding cable structure provided in embodiment 1 of the present invention.
In the figure: 1-a conductor; 2-a semiconducting shield layer; 3-silicon rubber insulating layer.
Detailed Description
The technical solution of the present invention is further explained by the following embodiments with reference to the accompanying drawings.
The present invention will be described in further detail below. However, the following examples are only simple examples of the present invention, and do not represent or limit the scope of the present invention, which is defined by the appended claims.
First, an embodiment
Example 1
The embodiment provides a winding cable, as shown in fig. 1, which is composed of a conductor 1, a semi-conductive shielding layer 2 and a silicon rubber insulating layer 3 in sequence from inside to outside.
The conductor 1 is formed by twisting and pressing 19 annealed round copper wires, the composition, the performance and the appearance of the conductor meet the requirements of a GB/T3956 standard No. 2 conductor, the direct current resistance of the conductor is 0.236 omega/km, the direct current resistance is higher than the GB/T3956 standard requirement, and the surface of the conductor is smooth and clean, has no damage to insulating burrs, sharp edges and raised or broken single wires.
And a semiconductive shielding layer 2 and a silicon rubber insulating layer 3 are formed on the outer layer of the conductor 1 by co-extrusion.
The sectional area of the conductor is designed according to the effective sectional area, and the effective sectional area is 75mm2The thickness of the semiconductive shielding layer is 0.5mm, and the thickness of the insulating layer is 1.0 mm.
The specific design method is shown in table 1:
TABLE 1
The semiconductive shielding layer is silicon rubber containing carbon black, wherein the mass fraction of the carbon black is as follows: 20 percent; the average particle diameter of the carbon black was 70 nm.
The insulation material of the silicon rubber insulation layer 3 comprises the following components in percentage by mass: 100 parts of methyl vinyl silicone rubber crude rubber (110-2S), 150 parts of a heat-conducting filler component (containing a heat-conducting filler which is formed by compounding aluminum oxide and boron nitride with average particle diameters of 10 micrometers and 6 micrometers respectively, wherein the aluminum oxide and the boron nitride are compounded, the surface of the heat-conducting filler component is treated by a silane coupling agent (KH-550) in advance, the mass fraction of the silane coupling agent accounts for 1.5 wt% of the heat-conducting filler, the mass ratio of the 10 micrometers to the 6 micrometers of the filler is 3:5), 10 parts of fumed silica, 5 parts of vinyl triethoxysilane (A-151), 1.5 parts of bis (2, 4-dichlorobenzoyl) peroxide (the content of an effective component is 50 wt%), and 2 parts of hydroxyl silicone oil.
The preparation method of the silicon rubber insulating layer 3 comprises the following steps:
(1) adding 100 parts of methyl vinyl silicone rubber raw rubber to a roller of a double-roller open mill according to the mass fraction, sequentially adding 10 parts of fumed silica and 2 parts of hydroxy silicone oil after roller wrapping so as to facilitate forming, adding 150 parts of heat-conducting filler group and 5 parts of vinyltriethoxysilane, uniformly mixing for the first time, adding 1.5 parts of bis (2, 4-dichlorobenzoyl) peroxide as a vulcanizing agent, and uniformly mixing for the second time to obtain a rubber compound;
(2) preheating a vulcanizing press, setting the pressure to be 10MPa and the temperature to be 120 ℃, preheating a die with a groove depth of 2 +/-0.2 mm and a groove depth of 1 +/-0.1 mm at 120 ℃, then paving transparent film paper on the die, placing the rubber compound in the step (1) into the film paper, covering a layer of film paper on the rubber compound to ensure cleanness and easy demolding, closing an upper cover of the die, placing the rubber compound on the preheated vulcanizing press, starting heating and vulcanizing for one time, wherein the vulcanizing time is 10 min;
and taking out the mixed rubber in the mold, and carrying out secondary vulcanization in an oven at 200 ℃ for 4h to obtain the silicon rubber insulating layer.
Example 2
The embodiment provides a winding cable which sequentially comprises a conductor, a semi-conductive shielding layer and a silicon rubber insulating layer from inside to outside.
The conductor is formed by twisting and pressing 19 annealed round copper wires, the composition, the performance and the appearance of the conductor accord with the specification of a 2 nd conductor in the GB/T3956 standard, the direct current resistance of the conductor is 0.257 omega/km, the direct current resistance is higher than the requirement of the GB/T3956 standard, and the surface of the conductor is smooth and clean, has no damage to insulating burrs, sharp edges and raised or broken single wires.
And co-extruding the conductor outer layer to form a semiconductive shielding layer and a silicon rubber insulating layer.
The sectional area of the conductor is designed according to the effective sectional area, and the effective sectional area is 70mm2The thickness of the semiconductive shielding layer is 0.4mm, and the thickness of the insulating layer is 1.0 mm.
The specific design was made in reference to example 1.
The semiconductive shielding layer is silicon rubber containing carbon black, wherein the mass fraction of the carbon black is as follows: 15 percent; the average particle diameter of the carbon black was 100 nm.
The insulation material of the silicon rubber insulation layer comprises the following components in parts by mass: 100 parts of methyl vinyl silicone rubber crude rubber (110-2S), 150 parts of a heat-conducting filler component (containing a heat-conducting filler which is formed by compounding aluminum oxide and boron nitride with average particle diameters of 10 micrometers and 6 micrometers respectively, wherein the aluminum oxide and the boron nitride are compounded, the surface of the heat-conducting filler component is treated by a silane coupling agent (KH-550) in advance, the mass fraction of the silane coupling agent accounts for 1.5 wt% of the heat-conducting filler, the mass ratio of the 10 micrometers to the 6 micrometers of the filler is 4:5), 15 parts of precipitated silica, 8 parts of vinyl triethoxysilane, 1.5 parts of bis (2, 4-dichlorobenzoyl) peroxide (the content of active ingredients is 50 wt%), and 2.5 parts of hydroxyl silicone oil.
The preparation method of the silicon rubber insulating layer comprises the following steps:
(1) adding 100 parts of methyl vinyl silicone rubber raw rubber to a roller of a double-roller open mill according to the mass fraction, sequentially adding 15 parts of precipitated white carbon black and 2.5 parts of hydroxy silicone oil after roller wrapping for forming, adding 150 parts of heat-conducting filler group and 8 parts of vinyl triethoxysilane, uniformly mixing for the first time, adding 1.5 parts of bis (2, 4-dichlorobenzoyl) peroxide as a vulcanizing agent, and uniformly mixing for the second time to obtain a rubber compound;
(2) preheating a vulcanizing press, setting the pressure to be 12MPa and the temperature to be 115 ℃, preheating a die with the groove depth of 2 +/-0.2 mm and the depth of 1 +/-0.1 mm at 115 ℃ in advance, then paving transparent film paper on the die, placing the rubber compound in the step (1) into the film paper, covering a layer of film paper on the rubber compound to ensure cleanness and easy demoulding, closing an upper cover of the die, placing the die on the preheated vulcanizing press, starting heating for one-time vulcanization, and vulcanizing for 12 min;
and taking out the mixed rubber in the mold, and carrying out secondary vulcanization in an oven at 200 ℃ for 4h to obtain the silicon rubber insulating layer.
Example 3
The embodiment provides a winding cable which sequentially comprises a conductor, a semi-conductive shielding layer and a silicon rubber insulating layer from inside to outside.
The conductor is formed by twisting and pressing 19 annealed round copper wires, the composition, the performance and the appearance of the conductor accord with the regulation of a 2 nd conductor of a GB/T3956 standard, the direct current resistance of the conductor is 0.193 omega/km, the conductor accords with the GB/T3956 standard requirement, and the surface of the conductor is smooth and has no damage to insulating burrs, sharp edges and raised or broken single wires.
And co-extruding the conductor outer layer to form a semiconductive shielding layer and a silicon rubber insulating layer.
The cross-sectional area of the conductor is designed according to a nominal cross-sectional area of 95mm2The thickness of the semiconductive shielding layer is 0.8mm, and the thickness of the insulating layer is 1.5 mm.
The insulation material of the silicon rubber insulation layer comprises the following components in parts by mass: 100 parts of methyl vinyl silicone rubber crude rubber (110-2S), 100 parts of heat-conducting filler component (which is composed of aluminum oxide with the average particle size of 10 mu m, and is subjected to surface treatment by using silane coupling agent (KH-550) in advance, wherein the silane coupling agent accounts for 1.2 wt% of the mass of the aluminum oxide), 5 parts of fumed silica, 3 parts of vinyl triethoxysilane, 1.5 parts of bis (2, 4-dichlorobenzoyl) peroxide (the content of effective components is 50 wt%), and 1.5 parts of hydroxyl silicone oil.
The semiconductive shielding layer is silicon rubber containing carbon black, wherein the mass fraction of the carbon black is as follows: 25 percent; the average particle diameter of the carbon black was 60 nm.
The preparation method of the silicon rubber insulating layer comprises the following steps:
(1) adding 100 parts of methyl vinyl silicone rubber raw rubber to a roller of a double-roller open mill according to the mass fraction, sequentially adding 5 parts of fumed silica and 1.5 parts of hydroxy silicone oil after wrapping the roller for forming, adding 100 parts of heat-conducting filler group and 3 parts of vinyl triethoxysilane, uniformly mixing for the first time, adding 1.5 parts of bis (2, 4-dichlorobenzoyl) peroxide as a vulcanizing agent, and uniformly mixing for the second time to obtain a rubber compound;
(2) preheating a vulcanizing press, setting the pressure to be 8MPa and the temperature to be 125 ℃, preheating a die with the groove depth of 2 +/-0.2 mm and the depth of 1 +/-0.1 mm at 125 ℃ in advance, then paving transparent film paper on the die, placing the rubber compound in the step (1) into the film paper, covering a layer of film paper on the rubber compound to ensure cleanness and easy demoulding, closing an upper cover of the die, placing the die on the preheated vulcanizing press, starting heating for one-time vulcanization, wherein the vulcanizing time is 8 min;
and taking out the mixed rubber in the mold, and carrying out secondary vulcanization in an oven at 200 ℃ for 4h to obtain the silicon rubber insulating layer.
Example 4
The present embodiment provides a winding cable, which is specifically designed as shown in table 2, except that the conductors are calculated and designed according to the nominal sectional area.
TABLE 2
The rest is the same as in example 1.
Example 4 compared with example 1, the conductor of which the resistance was 0.244 Ω/km, which is higher than that of example 1, in the section of the conductor designed according to the nominal sectional area calculation, thereby showing that the resistance of the conductor was reduced and the conductivity of the conductor was improved by designing the conductor with the effective sectional area.
Example 5
This example provides a winding cable with a nominal cross-sectional area of 70mm excluding the conductor2In addition to the computational design, the specific design is shown in table 3:
TABLE 3
The rest is the same as in example 1.
Example 5 compared to example 1, according to a nominal cross-sectional area of 70mm2The conductor section was calculated to have a resistance of 0.268 Ω/km, which is higher than that of the conductor in example 1, and which does not meet the electrical performance required for transformer design.
Example 6
This embodiment provides a winding cable with a nominal 95mm cross-sectional area excluding the conductor2In addition to the computational design, the specific design is shown in table 4:
TABLE 4
The rest is the same as in example 1.
Example 6 compared to example 1, according to a nominal cross-sectional area of 95mm2The cross section of the conductor is calculated and designed, the direct current resistance allowance is too large, copper materials are wasted, and the outer diameter of a finished product is large and exceeds the space required by the design of the transformer.
When manufacturing the transformer, need be in the utility model discloses embodiment 1 ~ 6 outside pouring is with structure silastic-layer, no longer gives unnecessary details here.
Second, comparative example
Comparative example 1
This comparative example provides a winding cable in which the "silicone rubber insulation layer" was replaced with an "ethylene propylene rubber insulation layer" and the remainder was the same as in example 1.
Comparative example 2
This comparative example provides a wound cable which was the same as in example 1 except that the thickness of the silicone rubber insulating layer was 0.7 mm.
Comparative example 2 has a reduced insulation thickness compared to example 1, resulting in failure of the withstand voltage test.
Comparative example 3
This comparative example provides a wound cable which was the same as in example 1 except that the thickness of the silicone rubber insulating layer was 1.9 mm.
Comparative example 3 has an increased insulation thickness compared to example 1, resulting in an outer diameter exceeding the transformer limit space.
Therefore, the utility model discloses well strict control silicon rubber insulating layer's thickness makes it can satisfy withstand voltage test and accord with the requirement of transformer winding cable.
Third, application example
Application examples 1 to 6
Application examples 1 to 6 respectively provide dry-type transformers using the winding cables obtained in examples 1 to 6 as winding coils, which refer to the design standards: GB/T1094.11, GB/T10228.
The dry-type transformer uses the cable prepared in the embodiment 1-6 as a coil, the voltage level can reach 66kV, the electric field distribution is uniform, the high temperature resistance reaches 200 ℃, the manufacturing process is simple, the space is saved, and the environment is protected.
Application comparative examples 1 to 3
The dry-type transformer using the winding cable obtained in comparative example 1-3 provided in comparative example 1 as a winding coil has a specific structure according to application examples 1-3.
Fourth, test and results
Taking example 1 as an example, various performance tests are performed on the prepared silicone rubber insulating layer by using test equipment such as an electronic universal tester, a shore durometer, a thermal conductivity tester, a low-temperature impact tester, a volume resistivity tester, an alternating-current medium strength tester and the like, and the specific test method adopts GB/T528-2009, GB/T2941-2006 and GB/T2951-2008; the ethylene propylene rubber insulation layer of comparative example 1 was tested in the same manner, and the test conditions and results are shown in table 1.
TABLE 1
As can be seen from table 1: the mechanical property of the ethylene propylene rubber insulating layer in the comparative example 1 is lower than that of the silicon rubber insulating layer in the example 1, the long-term working temperature is only 90 ℃, the long-term working temperature is far lower than that of the example 1, and the volume resistivity is one order of magnitude lower than that of the silicon rubber, so that the ethylene propylene rubber insulating layer is not suitable for being used as a cable for a 66kV high-voltage transformer coil.
To sum up, the utility model provides a winding cable includes conductor, semiconduction shielding layer and silicon rubber insulating layer from interior to exterior in proper order to control silicon rubber insulating layer's thickness and be 0.8 ~ 1.5mm, can satisfy transformer space and withstand voltage demand, transformer voltage level can reach 66kV, and electric field distribution is even, and high temperature resistant reaches 200 ℃, and manufacturing process is simple.
The applicant states that the present invention is described by the above embodiments, but the present invention is not limited to the above detailed structural features, i.e. the present invention can be implemented only by relying on the above detailed structural features. It should be clear to those skilled in the art that any modifications to the present invention, to the equivalent replacement of selected parts and the addition of auxiliary parts, the selection of specific modes, etc., all fall within the scope of protection and disclosure of the present invention.
Claims (10)
1. A winding cable is characterized by comprising a conductor, a semi-conductive shielding layer and a silicon rubber insulating layer in sequence from inside to outside;
the semi-conductive shielding layer is coated on the outer surface of the conductor;
the silicon rubber insulating layer is coated on the outer surface of the semi-conductive shielding layer; the thickness of the silicon rubber insulating layer is 0.8-1.5 mm.
2. The winding cable of claim 1, wherein the conductor comprises at least 19 annealed copper wires stranded and compacted.
3. The winding cable of claim 2, wherein the conductor is a type 2 compacted stranded round copper conductor.
4. The winding cable of claim 1, wherein the semi-conductive shielding layer is a silicone rubber semi-conductive layer.
5. The winding cable of claim 1 or 2, wherein the thickness of the semi-conductive shielding layer is 0.4-0.8 mm.
6. A winding cable according to claim 1 or 2, characterized in that the cross-sectional area of the conductor is designed according to the effective cross-sectional area.
7. A winding cable according to claim 1 or 2, wherein the conductor has an effective cross-sectional area of 70 to 95mm2。
8. A transformer, characterized in that it comprises a winding cable according to any one of claims 1 to 7.
9. The transformer of claim 8, comprising a transformer insulation comprising a silicone rubber insulation layer cast over the outside of the winding cable.
10. The transformer of claim 9, wherein the transformer is a dry-type transformer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021806112.3U CN213424623U (en) | 2020-08-25 | 2020-08-25 | Winding cable and transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021806112.3U CN213424623U (en) | 2020-08-25 | 2020-08-25 | Winding cable and transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213424623U true CN213424623U (en) | 2021-06-11 |
Family
ID=76259130
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021806112.3U Active CN213424623U (en) | 2020-08-25 | 2020-08-25 | Winding cable and transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213424623U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114792598A (en) * | 2022-04-13 | 2022-07-26 | 浙江大学 | Transformer winding with internal shielding structure and design method thereof |
-
2020
- 2020-08-25 CN CN202021806112.3U patent/CN213424623U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114792598A (en) * | 2022-04-13 | 2022-07-26 | 浙江大学 | Transformer winding with internal shielding structure and design method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN112037964A (en) | Winding cable and transformer | |
| CN204991258U (en) | Environment -friendly high life crosslinked cable | |
| CN106046799A (en) | Flame-retardant heat conductive insulation silicone rubber product for power equipment and preparing method of flame-retardant heat conductive insulation silicone rubber product | |
| CN103065717A (en) | 6kV-35kV rated-voltage ceramic silicon rubber insulation medium-voltage fire-resistant frequency converter cable and process | |
| CN102760526B (en) | Ceramic silicon rubber insulation medium-voltage fire-resistant cable with rated voltage of 6kV-35kV and machining process thereof | |
| CN213424623U (en) | Winding cable and transformer | |
| CN202758656U (en) | Ceramic silicon rubber insulation medium-voltage fire-resistant cable with rated voltage of 6kV-35kV | |
| CN112002463B (en) | High-voltage AC/DC wall bushing of more than 35kV and preparation method thereof | |
| CN103468000B (en) | High ampacity low surface temperature rise cable insulation rubber for ships and its manufacturing method | |
| AU2024205209A1 (en) | High-voltage torsion-resistant flexible cable, preparation method and application therefof | |
| CN117877802A (en) | An ultra-flexible DC cable for high-power charging | |
| CN218513193U (en) | Long-life flame-retardant B1-grade halogen-free low-smoke low-voltage power cable | |
| CN115762865A (en) | Novel high-voltage power cable with 220kV large-section smooth aluminum sheath | |
| CN116013587A (en) | Multi-core photovoltaic cable for solar power generation system and manufacturing method thereof | |
| CN115376728A (en) | Aluminum alloy conductor dual-core dual-steel-tape armored photovoltaic cable and manufacturing method thereof | |
| CN1542877A (en) | A winding cable capable of reducing loss | |
| CN207038213U (en) | A kind of New energy electric vehicle high-voltage flexible cable | |
| CN201489863U (en) | Oil resistant and flame retardant cable for track locomotive | |
| CN209216604U (en) | A kind of light-duty copper core copper sheath mineral insulated cable | |
| CN202523435U (en) | Irradiation crosslinking chlorinated polyethylene (CPE) insulating flexible cable | |
| CN207718859U (en) | Solid and gas mixed state insulated cable | |
| CN206672676U (en) | A kind of duplex sheath rubber cable | |
| CN207441339U (en) | A kind of high-speed EMU cable | |
| CN201629181U (en) | Direct current cable with flame resistance, fire resistance, low smoke, no halogen, water prevention, mouse prevention, weather resistance and energy saving | |
| CN111081418A (en) | High-performance tensile tear-resistant flame-retardant cable and manufacturing method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |