CN113724947A - Dry-type high-voltage bushing insulation device and use method thereof - Google Patents
Dry-type high-voltage bushing insulation device and use method thereof Download PDFInfo
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- H01B17/00—Insulators or insulating bodies characterised by their form
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Abstract
A dry-type high-voltage bushing insulating device and its operation method, including current-carrying conducting rod, conductive joint, main insulating core, mounting flange, silicon rubber umbrella cover, equalizing ball; semiconductor paint is sprayed on the wall of the inner cavity of the main insulating core, an equipotential surface is formed on the wall of the inner cavity of the main insulating core, and the current-carrying conducting rod penetrates through the main insulating core and is connected with the equipotential surface to form a high-voltage electrode; the conductive joints and the voltage-sharing balls are respectively arranged on two sides of the main insulating core. The dry-type high-voltage bushing insulation device and the use method thereof have reasonable structural design, and the dry-type high-voltage bushing insulation device is formed by assembling the current-carrying conducting rod, the conducting joint, the main insulation core, the mounting flange, the silicon rubber umbrella sleeve, the voltage-sharing ball and the grounding electrode, is used in an alternating current power system or a direct current power system, and improves the ultraviolet aging resistance, the insulation performance and the tensile strength of the modified epoxy resin by adopting the modified epoxy resin.
Description
Technical Field
The invention belongs to the technical field of high-voltage insulating sleeves, and particularly relates to a dry-type high-voltage sleeve insulating device and a using method thereof.
Background
The safe operation of the power cable and the accessories thereof is the basic guarantee of the safety of the whole power system. The cable accessory is a weak link compared to the cable body. The probability of the fault of the traditional transmission line shows that the fault rate of the cable accessories accounts for about 70 percent, so that the running state of the cable terminal as a key connecting device directly influences the safe running of a cable line.
The design of the high-voltage insulating bushing is extremely important to ensure that the cable termination can operate stably and reliably. In the dry-type high-voltage bushing insulator, epoxy resin is widely used for insulation protection of the dry-type high-voltage bushing insulator due to its excellent electrical insulation function, mechanical properties and economic price. However, epoxy resin has poor heat resistance, heat generated during operation can cause thermal aging of the epoxy resin, crosslinked resin molecules are firstly fastened and then degraded and stress changes, the insulation of the material is reduced along with the aging time, and the exposed epoxy resin part can be influenced by ultraviolet radiation, so that the epoxy resin can be subjected to photo-aging, and the performance of the epoxy resin is reduced in all aspects. Therefore, it is desirable to develop a dry-type high-voltage bushing insulation device and a method for using the same to solve the above-mentioned problems.
Chinese patent application No. CN202110040971.9 discloses a novel dry-type bushing for power system, which aims to make the manufactured bushing have a wide variety of types, can be used in ac power system and dc power system, and does not solve the problem of performance degradation in various aspects caused by aging of epoxy resin in the dry-type high-voltage bushing insulating device.
Disclosure of Invention
The purpose of the invention is as follows: in order to overcome the defects, the invention aims to provide a dry-type high-voltage bushing insulation device and a using method thereof, the structural design is reasonable, the current-carrying conducting rod, the conducting joint, the main insulating core, the mounting flange, the silicon rubber umbrella cover, the voltage-equalizing ball and the grounding electrode are assembled into the dry-type high-voltage bushing insulation device, the dry-type high-voltage bushing insulation device is used in an alternating current power system or a direct current power system, the ultraviolet aging resistance, the insulation performance and the tensile strength of the modified epoxy resin are improved by adopting the modified epoxy resin, and the application prospect is wide.
The purpose of the invention is realized by the following technical scheme:
a dry-type high-voltage bushing insulating device comprises a current-carrying conducting rod, a conducting joint, a main insulating core, a mounting flange, a silicon rubber umbrella sleeve and a voltage-sharing ball; semiconductor paint is sprayed on the wall of the inner cavity of the main insulating core, an equipotential surface is formed on the wall of the inner cavity of the main insulating core, and the current-carrying conducting rod penetrates through the main insulating core and is connected with the equipotential surface to form a high-voltage electrode; the conductive connector and the voltage-sharing ball are respectively arranged on two sides of the main insulating core; the outer wall of the main insulating core is provided with a groove, a grounding electrode is wound in the groove, the mounting flange is glued on the grounding electrode and forms a low-voltage electrode, the silicon rubber umbrella sleeve is arranged on the main insulating core, and an air end electrode of the grounding electrode is wrapped in the silicon rubber umbrella sleeve; the main insulating core is made of an insulating tube formed by impregnating glass fiber yarns with a modified epoxy resin and by pultrusion; the grounding electrode is made of carbon fiber impregnated with modified epoxy resin; the modified epoxy resin mainly comprises the following components in parts by weight: 90-100 parts of epoxy resin, 70-80 parts of curing agent, 15-18 parts of toughening agent, 2-5 parts of modified ZnO and 0.5-1.0 part of accelerator.
The dry-type high-voltage bushing insulation device is reasonable in structural design, the main insulation core is made of glass fiber yarns, impregnated with modified epoxy resin and formed by a pultrusion insulation tube, a layer of semiconductor paint is sprayed on the inner side of the main insulation core to form an equipotential surface, the equipotential surface is connected with the current-carrying conducting rod to form a high-voltage electrode of the dry-type high-voltage bushing insulation device, an arc-shaped groove is machined in the installation flange part on the outer side, then carbon fiber wires impregnated with the modified epoxy resin are tiled and wound along the groove, and after solidification, the equipotential layer without sharp corners is machined by a lathe to form a semiconductor and an equipotential layer for installing a grounding flange to form a low-voltage electrode. The upper end parcel silicon rubber chute boot of low-voltage electrode is as external insulation to improve the field intensity of ground connection, improve the partial discharge level, the electric field not only can be improved to hoop winding carbon fiber layer, more importantly can effectively prevent the insulating tube vertical fracture from appearing, this is because pultrusion's insulating tube only has vertical fibre, after the hoop carbon fiber of winding high strength, can avoid the fracture risk.
The main insulating core and the grounding electrode both use epoxy resin, the conventional epoxy resin has poor heat resistance, the heat generated in operation can cause the epoxy resin to generate thermal aging, so that cross-linked resin molecules are firstly fastened and then degraded and stress changes, the insulativity of the material is reduced along with the increase of aging time, and the exposed epoxy resin part can be influenced by ultraviolet radiation, so that the epoxy resin generates optical aging, and the performance of the material is reduced in all aspects.
In addition, under the coordination of a curing agent, a toughening agent and an accelerant, active groups on the surfaces of modified ZnO particles can participate in a crosslinking reaction of epoxy resin molecules, so that interface intercoupling is enhanced, trap energy levels at an interface are improved, the insulating property of the modified epoxy resin is improved, the deformation of the epoxy molecules can be better restrained, and the tensile strength of the modified epoxy resin is improved.
Further, in the dry-type high-voltage bushing insulating device, the epoxy resin is bisphenol AE51 type, the curing agent is methyl tetrahydrophthalic anhydride, the toughening agent is DH410, and the accelerator is DMP-30.
The invention also relates to a using method of the dry-type high-voltage bushing insulating device, and the using method is that the current-carrying conducting rod, the conducting joint, the main insulating core, the mounting flange, the silicon rubber umbrella cover, the voltage-equalizing ball and the grounding electrode are assembled into the dry-type high-voltage bushing insulating device and then are used in an alternating current power system or a direct current power system.
Further, the method for using the dry-type high-voltage bushing insulation device needs to prepare a main insulation core before assembling, and the preparation of the main insulation core comprises the following steps: fully rolling and soaking multiple strands of dried glass fiber yarns in a glue pool of modified epoxy resin, then compressing and extruding the glass fiber yarns into a tubular insulating tube through a die, and drying the insulating tube through a curing oven.
The main insulating core prepared by the pultrusion process has excellent electrical performance and high mechanical strength through the characteristics of the glass fiber yarns and the modified epoxy resin.
Further, in the using method of the dry-type high-voltage bushing insulating device, the main insulating core is a cylindrical insulating tube with an inner diameter of 50-100mm, an outer diameter of 100-200mm and a length of 1-3m, the inner part of the main insulating tube is free of a capacitive screen, the insulating thickness of the insulating tube is 20-60mm, then a layer of semiconductor paint is sprayed in the inner hole of the insulating tube, and a groove with a depth of 1-2mm and a width of 500-800mm is turned upwards at a position 300-400mm away from the bottom of the insulating tube.
Furthermore, the use method of the dry-type high-voltage bushing insulation device,
further, the method for using the dry-type high-voltage bushing insulation device needs to prepare the grounding electrode before assembling, and comprises the following steps: the carbon fiber impregnated with the modified epoxy resin is wound in the groove of the main insulating core to serve as an earth electrode, wherein the length of 300-150 mm at the lower end of the earth electrode serves as an earth part for installing the current transformer, the length of 100-150mm at the middle part of the earth electrode serves as an installation flange, and the length of 100-150mm at the upper part of the earth electrode wraps the silicon rubber umbrella cover.
Further, the method for using the dry-type high-voltage bushing insulation device comprises the following steps:
(1) and preparing modified ZnO: preparing a silane coupling agent KH550 hydrolysate, adding ethanol into dried nano ZnO, stirring and dispersing uniformly, adding the silane coupling agent KH550 hydrolysate, fully mixing, mechanically stirring for 40-60min, stirring with ultrasonic waves to obtain a mixed solution I, placing the mixed solution in a forced air drying oven, drying, and grinding for later use to obtain KH550 modified ZnO; adding acetone into KH550 modified ZnO, mechanically stirring for 30-40min, and stirring with ultrasonic wave to obtain a second mixed solution, gradually adding carboxyl-terminated hyperbranched polyester into the second mixed solution, adding p-toluenesulfonic acid, stirring at 100 ℃ for 40-60min with magnetic force, adjusting the rotation speed of the magnetic force stirring to 1000-1500r/min to obtain a third mixed solution, drying the third mixed solution in a drying box, and grinding to obtain modified ZnO;
(2) and preparing the modified epoxy resin: heating epoxy resin, adding modified ZnO into epoxy resin, mechanically stirring for 40-60min, sequentially adding curing agent, toughening agent and accelerator, stirring for 60-90min, and performing ultrasonic dispersion and 50-60 deg.C water bath heating; and after uniformly stirring, obtaining a mixed solution IV, placing the mixed solution IV into a mixed solution IV vacuum drier, and defoaming to obtain the modified epoxy resin.
Because of the characteristics of small particle size and high surface activity of nano ZnO, the nano ZnO has the problem of ultrafine particle agglomeration, in order to solve the problems of non-uniform doping and poor interface compatibility of modified epoxy resin due to the dispersibility of nano ZnO particles in epoxy resin, the invention adopts silane coupling agent KH550 in cooperation with carboxyl-terminated hyperbranched polyester nano ZnO to obtain nonlinear macromolecules with highly branched structures under the catalytic action of a catalyst p-toluenesulfonic acid, so that the aggregation state is changed, carboxyl at the end of carboxyl-terminated hyperbranched polyester can participate in the reaction, carboxyl at the other end can also participate in the curing reaction of the epoxy resin, carboxyl at the end of the carboxyl-terminated hyperbranched polyester can be combined with hydroxyl generated by the ring opening of the epoxy resin, so that the crosslinking degree of the modified epoxy resin is better, and on the one hand, the interface between the epoxy resin and nano ZnO adulterant is further improved, the interface compatibility is improved, and the internal defects are reduced. On the other hand, the hyperbranched polyester can increase the mechanical property of the cured modified epoxy resin and introduce the excellent mechanical property.
The mass ratio of the silane coupling agent to the ethanol to the water in the silane coupling agent KH550 hydrolysate is 5: 18: 2; the mass ratio of the nano ZnO to the silane coupling agent KH550 hydrolysate is 3: 8; the mass ratio of the mixed solution II, the carboxyl-terminated hyperbranched polyester and the p-toluenesulfonic acid is 10: 2: 1.
further, in the using method of the dry-type high-voltage bushing insulating device, the mass ratio of the silane coupling agent to the ethanol to the water in the silane coupling agent KH550 hydrolysate is 5: 18: 2; the mass ratio of the nano ZnO to the silane coupling agent KH550 hydrolysate is 3: 8; the mass ratio of the mixed solution II, the carboxyl-terminated hyperbranched polyester and the p-toluenesulfonic acid is 10: 2: 1.
compared with the prior art, the invention has the following beneficial effects:
(1) the structure design is reasonable, the current-carrying conducting rod, the conducting joint, the main insulating core, the mounting flange, the silicon rubber umbrella sleeve, the voltage-sharing ball and the grounding electrode are assembled into the dry-type high-voltage bushing insulating device, the application range is wide, the voltage grade is 380V-550 kV or higher, the current grade can be several amperes to several tens of thousands of amperes, and the dry-type high-voltage bushing insulating device is used in an alternating current power system or a direct current power system;
(2) the modified epoxy resin has strong absorption effect on ultraviolet light by adding the modified ZnO, can improve the ultraviolet aging resistance of the modified epoxy resin, and in addition, under the coordination of a curing agent, a flexibilizer and an accelerant, active groups on the surface of modified ZnO particles can participate in the crosslinking reaction of epoxy resin molecules, so that the interface intercoupling is strengthened, the trap level at the interface is improved, the insulating property of the modified epoxy resin is improved, the deformation of the epoxy molecules can be better restrained, and the tensile strength of the modified epoxy resin is improved.
Drawings
Fig. 1 is a schematic structural diagram of an insulating device for a dry high-voltage bushing according to the present invention;
FIG. 2 is a diagram of the thermal-ultraviolet aging AC conductivity of the modified epoxy resin and bisphenol AE51 epoxy resin of the dry-type high-voltage bushing insulation device according to the present invention;
fig. 3 is a diagram of the thermal-ultraviolet aging dielectric constant of the modified epoxy resin and the bisphenol AE51 epoxy resin of the dry-type high-voltage bushing insulation device according to the present invention;
in the figure: the current-carrying conducting rod comprises a current-carrying conducting rod 1, a conducting joint 2, a main insulating core 3, a mounting flange 4, a silicon rubber umbrella cover 5, a voltage-sharing ball 6 and a grounding electrode 7.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the following specific embodiments and accompanying fig. 1-3, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, the following embodiments provide a dry-type high voltage bushing insulating device, which includes a current-carrying conducting rod 1, a conducting joint 2, a main insulating core 3, a mounting flange 4, a silicone rubber umbrella 5, and a voltage-sharing ball 6; semiconductor paint is sprayed on the wall of the inner cavity of the main insulating core 3, an equipotential surface is formed on the wall of the inner cavity of the main insulating core 3, and the current-carrying conducting rod 1 penetrates through the main insulating core 3 and is connected with the equipotential surface to form a high-voltage electrode; the conductive connector 2 and the voltage-sharing ball 6 are respectively arranged on two sides of the main insulating core 2; be provided with the recess on the 3 outer walls of main insulating core, winding telluric electricity field 7 in the recess, mounting flange 4 mucilage binding is on telluric electricity field 7 to form the low voltage electrode, silicon rubber chute boot 5 sets up on main insulating core 3, telluric electricity field 7's air end electrode parcel is in silicon rubber chute boot 5.
The main insulator core 3 is made of an insulating tube in which glass fiber yarns are impregnated with a modified epoxy resin and which is formed by pultrusion; the ground electrode 7 is made of carbon fiber impregnated with modified epoxy resin; the modified epoxy resin mainly comprises the following components in parts by weight: 90-100 parts of epoxy resin, 70-80 parts of curing agent, 15-18 parts of toughening agent, 2-5 parts of modified ZnO and 0.5-1.0 part of accelerator.
Further, the epoxy resin is bisphenol AE51 type, the curing agent is methyl tetrahydrophthalic anhydride, the toughening agent is DH410, and the accelerator is DMP-30.
Example 1
The use method of the dry-type high-voltage bushing insulation device comprises the steps of assembling a current-carrying conducting rod 1, a conducting joint 2, a main insulation core 3, a mounting flange 4, a silicon rubber umbrella sleeve 5, a voltage-sharing ball 6 and a grounding electrode 7 into the dry-type high-voltage bushing insulation device, and then using the dry-type high-voltage bushing insulation device in an alternating current power system or a direct current power system.
Before assembly, the main insulating core 3 needs to be prepared, and the preparation of the main insulating core 3 comprises the following steps: fully rolling and soaking multiple strands of dried glass fiber yarns in a glue pool of modified epoxy resin, then compressing and extruding the glass fiber yarns into a tubular insulating tube through a die, and drying the insulating tube through a curing oven.
Further, the main insulating core 3 is a cylindrical insulating tube with an inner diameter of 50-100mm, an outer diameter of 100-.
Further, before assembling, it is necessary to prepare the ground electrode 7, including the following steps: carbon fibers impregnated with modified epoxy resin are wound in the groove of the main insulating core 3 to serve as a grounding electrode 7, wherein the length of 300-500mm of the lower end of the grounding electrode 7 serves as a grounding part for mounting the current transformer, the length of 100-150mm of the middle part of the grounding electrode 7 serves as a mounting flange 5, and the length of 100-150mm of the upper part of the grounding electrode 7 wraps the silicon rubber umbrella cover 5.
The dry high-voltage bushing insulating device has wide application range, the voltage grade is 380V-550 kV or higher, the current grade can be from several amperes to several tens of thousands of amperes, and the dry high-voltage bushing insulating device can be used for an alternating current power system and a direct current power system.
Example 2
The preparation of the modified epoxy resin comprises the following steps:
(1, preparing modified ZnO, namely preparing KH550 hydrolysate of a silane coupling agent, adding ethanol into dried nano ZnO, stirring and dispersing uniformly, adding KH550 hydrolysate of the silane coupling agent, fully mixing, stirring for 45min mechanically with the assistance of ultrasonic waves to obtain a first mixed solution, placing the first mixed solution into an air-blowing drying box, drying and grinding for later use to obtain KH550 modified ZnO, adding acetone into KH550 modified ZnO, stirring for 30min mechanically with the assistance of ultrasonic waves to obtain a second mixed solution, gradually adding carboxyl-terminated hyperbranched polyester into the second mixed solution, adding p-toluenesulfonic acid, stirring for 60min at 100 ℃ by using magnetic force, adjusting the rotation speed of the magnetic stirring to 1000r/min to obtain a third mixed solution, placing the third mixed solution into a drying box, drying and grinding to obtain modified ZnO;
(2) preparation of modified epoxy resin: heating bisphenol AE51 type epoxy resin, adding modified ZnO into the epoxy resin, mechanically stirring for 60min, sequentially adding methyl tetrahydrophthalic anhydride, DH410 toughening agent and DMP-30 accelerator, continuously stirring for 60min, and performing ultrasonic dispersion and 60 ℃ water bath heating; and after uniformly stirring, obtaining a mixed solution IV, placing the mixed solution IV into a mixed solution IV vacuum drier, and defoaming to obtain the modified epoxy resin.
Wherein the mass ratio of the silane coupling agent to the ethanol to the water in the KH550 hydrolysate of the silane coupling agent is 5: 18: 2; the mass ratio of the nano ZnO to the silane coupling agent KH550 hydrolysate is 3: 8; the mass ratio of the mixed solution II, the carboxyl-terminated hyperbranched polyester and the p-toluenesulfonic acid is 10: 2: 1.
example 2
The preparation of the modified epoxy resin comprises the following steps:
(1) preparing modified ZnO: preparing a silane coupling agent KH550 hydrolysate, adding ethanol into dried nano ZnO, stirring and dispersing uniformly, adding the silane coupling agent KH550 hydrolysate, fully mixing, mechanically stirring for 60min, stirring with ultrasonic waves to obtain a mixed solution I, placing the mixed solution in a forced air drying oven, drying, and grinding for later use to obtain KH550 modified ZnO; adding acetone into KH550 modified ZnO, mechanically stirring for 40min, and stirring with ultrasonic wave to obtain a second mixed solution, gradually adding carboxyl-terminated hyperbranched polyester into the second mixed solution, adding p-toluenesulfonic acid, stirring at 100 ℃ for 60min with magnetic force, adjusting the rotation speed of magnetic stirring to 1500r/min to obtain a third mixed solution, drying the third mixed solution in a drying oven, and grinding to obtain modified ZnO;
(2) preparation of modified epoxy resin: heating bisphenol AE51 type epoxy resin, adding modified ZnO into the epoxy resin, mechanically stirring for 40min, sequentially adding methyl tetrahydrophthalic anhydride, DH410 toughening agent and DMP-30 accelerator, continuously stirring for 80min, and performing ultrasonic dispersion and 50 ℃ water bath heating; and after uniformly stirring, obtaining a mixed solution IV, placing the mixed solution IV into a mixed solution IV vacuum drier, and defoaming to obtain the modified epoxy resin.
Wherein the mass ratio of the silane coupling agent to the ethanol to the water in the KH550 hydrolysate of the silane coupling agent is 5: 18: 2; the mass ratio of the nano ZnO to the silane coupling agent KH550 hydrolysate is 3: 8; the mass ratio of the mixed solution II, the carboxyl-terminated hyperbranched polyester and the p-toluenesulfonic acid is 10: 2: 1.
effect verification:
the modified epoxy resins obtained in examples 2 and 3 and bisphenol AE51 type epoxy resin (comparative example) were subjected to performance tests, and the test results are shown in table 1.
(1) Insulating property: the modified epoxy resins obtained in examples 2 and 3 and bisphenol AE51 type epoxy resin (comparative example) were subjected to partial discharge inception voltage and short-time breakdown voltage tests using a partial discharge-free test transformer and a control panel, model No. YDQ15KVA/200 KV.
(2) Mechanical properties: fixing the modified epoxy resins obtained in the above examples 2 and 3 and the bisphenol AE51 type epoxy resin (comparative example) in a designated area of a test bed by using a D2-5DL type electronic universal tester, aligning the axes of the modified epoxy resins obtained in the above examples 2 and 3 and the bisphenol AE51 type epoxy resin (comparative example) with the center line of a metal fixture, and applying a static tensile load at a constant speed at a set tensile speed (10 mm/mm) along the axial direction until a test sample is broken; the tensile strength was calculated by measuring the load applied to the specimen during stretching and the elongation length.
TABLE 1
| Partial discharge starting voltage (kV) | Average breakdown voltage (kV) | Tensile Strength (MPa) | |
| Example 2 | 16.1 | 26.4 | 76.2 |
| Example 3 | 45.9 | 26.1 | 76.4 |
| Comparative example | 8.9 | 15.6 | 34.5 |
(3) Aging resistance: referring to the international electrotechnical commission IEC-61109-2008 standard, the materials were subjected to thermal-ultraviolet combined aging using an ultraviolet aging chamber for 1 day, 3 days, 5 days, 7 days, 9 days, 11 days, 13 days and 15 days, respectively, and then the modified epoxy resins obtained in examples 2 and 3 and the bisphenol AE51 type epoxy resins (comparative examples) which were not subjected to thermal-ultraviolet combined aging and thermal-ultraviolet combined aging for 1 day, 3 days, 5 days, 7 days, 9 days, 11 days, 13 days and 15 days were subjected to impedance/gain-phase analyzer testing for the ac conductivity and the dielectric constant, respectively, and the results are shown in fig. 2 and fig. 3.
As can be seen from fig. 2, the trend of the change in the alternating current conductivity of the comparative example exhibited a change of increasing, then decreasing, and then increasing, and the conductivity reached the lowest value at 11 days of the combined aging, and then rapidly increased. While the embodiments 2 and 3 are close to monotone decreasing, and the insulation performance of the embodiments 2 and 3 is continuously improved along with the increase of the aging time.
From fig. 3, it can be seen that the dielectric loss tangent of the comparative example remained substantially unchanged 11 days before aging, slightly less than that of examples 2 and 3, but increased rapidly thereafter and exceeded that of examples 2 and 3. The dielectric loss of the embodiments 2 and 3 is increased along with the increase of the aging time, the increasing rates are not basically consistent, and the dielectric loss has smaller loss factors when the aging time is longer, so that the embodiments 2 and 3 have longer-lasting inhibition effect on the heat-violet combination aging, and can better inhibit the increase speed of the dielectric loss when the aging time is longer.
The specific methods of use of the present invention are numerous and the above description is only of the preferred embodiment of the invention. It should be noted that the above examples are only for illustrating the present invention, and are not intended to limit the scope of the present invention. It will be apparent to those skilled in the art that various modifications can be made without departing from the principles of the invention and these modifications are to be considered within the scope of the invention.
Claims (8)
1. A dry-type high-voltage bushing insulation device is characterized by comprising a current-carrying conducting rod (1), a conducting joint (2), a main insulation core (3), a mounting flange (4), a silicon rubber umbrella sleeve (5) and a voltage-sharing ball (6); semiconductor paint is sprayed on the wall of the inner cavity of the main insulating core (3), an equipotential surface is formed on the wall of the inner cavity of the main insulating core (3), and the current-carrying conducting rod (1) penetrates through the main insulating core (3) and is connected with the equipotential surface to form a high-voltage electrode; the conductive connector (2) and the voltage-sharing ball (6) are respectively arranged on two sides of the main insulating core (2); a groove is formed in the outer wall of the main insulating core (3), a grounding electrode (7) is wound in the groove, the mounting flange (4) is glued on the grounding electrode (7) and forms a low-voltage electrode, the silicon rubber umbrella cover (5) is arranged on the main insulating core (3), and an air end electrode of the grounding electrode (7) is wrapped in the silicon rubber umbrella cover (5); the main insulating core (3) is made of an insulating tube formed by impregnating glass fiber yarns with a modified epoxy resin and performing pultrusion; the grounding electrode (7) is made of carbon fiber impregnated with modified epoxy resin; the modified epoxy resin mainly comprises the following components in parts by weight: 90-100 parts of epoxy resin, 70-80 parts of curing agent, 15-18 parts of toughening agent, 2-5 parts of modified ZnO and 0.5-1.0 part of accelerator.
2. The dry high voltage bushing insulation device according to claim 1, wherein the epoxy resin is bisphenol AE51 type, the curing agent is methyl tetrahydrophthalic anhydride, the toughening agent is DH410, and the accelerator is DMP-30.
3. Use of the dry high voltage bushing insulator according to any of claims 1-2, wherein the use is to assemble the current-carrying conducting rod (1), the conducting joint (2), the main insulating core (3), the mounting flange (4), the silicone rubber umbrella (5), the voltage-equalizing ball (6), and the grounding electrode (7) into a dry high voltage bushing insulator, which is then used in an ac power system or a dc power system.
4. Use of a dry high voltage bushing insulator according to claim 3, characterized in that the main insulator core (3) is prepared before assembly, and the preparation of the main insulator core (3) comprises the following steps: fully rolling and soaking multiple strands of dried glass fiber yarns in a glue pool of modified epoxy resin, then compressing and extruding the glass fiber yarns into a tubular insulating tube through a die, and drying the insulating tube through a curing oven.
5. The use method of the dry-type high voltage bushing insulation device according to claim 4, wherein the main insulation core (3) is a cylindrical insulation tube with an inner diameter of 50-100mm, an outer diameter of 100-.
6. Use of a dry high voltage bushing insulation according to claim 4, characterized in that prior to assembly, the ground electrode (7) is prepared, comprising the steps of: carbon fibers impregnated with modified epoxy resin are wound in the groove of the main insulating core (3) to serve as a grounding electrode (7), wherein the length of 300 plus 500mm at the lower end of the grounding electrode (7) serves as a grounding part for mounting the current transformer, the length of 100 plus 150mm at the middle part of the grounding electrode (7) serves as a mounting flange (5), and the length of 100 plus 150mm at the upper part of the grounding electrode (7) wraps the silicon rubber umbrella cover (5).
7. Use of a dry high voltage bushing insulation according to claim 4, characterized in that the preparation of the modified epoxy resin comprises the following steps:
preparing modified ZnO: preparing a silane coupling agent KH550 hydrolysate, adding ethanol into dried nano ZnO, stirring and dispersing uniformly, adding the silane coupling agent KH550 hydrolysate, fully mixing, mechanically stirring for 40-60min, stirring with ultrasonic waves to obtain a mixed solution I, placing the mixed solution in a forced air drying oven, drying, and grinding for later use to obtain KH550 modified ZnO; adding acetone into KH550 modified ZnO, mechanically stirring for 30-40min, and stirring with ultrasonic wave to obtain a second mixed solution, gradually adding carboxyl-terminated hyperbranched polyester into the second mixed solution, adding p-toluenesulfonic acid, stirring at 100 ℃ for 40-60min with magnetic force, adjusting the rotation speed of the magnetic force stirring to 1000-1500r/min to obtain a third mixed solution, drying the third mixed solution in a drying box, and grinding to obtain modified ZnO;
preparation of modified epoxy resin: heating epoxy resin, adding modified ZnO into epoxy resin, mechanically stirring for 40-60min, sequentially adding curing agent, toughening agent and accelerator, stirring for 60-90min, and performing ultrasonic dispersion and 50-60 deg.C water bath heating; and after uniformly stirring, obtaining a mixed solution IV, placing the mixed solution IV into a mixed solution IV vacuum drier, and defoaming to obtain the modified epoxy resin.
8. The use method of the dry high-voltage bushing insulating device according to claim 7, wherein the mass ratio of the silane coupling agent to the ethanol to the water in the hydrolysate KH550 is 5: 18: 2; the mass ratio of the nano ZnO to the silane coupling agent KH550 hydrolysate is 3: 8; the mass ratio of the mixed solution II, the carboxyl-terminated hyperbranched polyester and the p-toluenesulfonic acid is 10: 2: 1.
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| CN202111009658.5A CN113724947B (en) | 2021-08-31 | 2021-08-31 | Dry-type high-voltage bushing insulation device and use method thereof |
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| CN202111009658.5A CN113724947B (en) | 2021-08-31 | 2021-08-31 | Dry-type high-voltage bushing insulation device and use method thereof |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005272813A (en) * | 2004-02-23 | 2005-10-06 | Japan Epoxy Resin Kk | Modified epoxy resin composition and method of producing the same |
| CN102719213A (en) * | 2012-07-06 | 2012-10-10 | 江苏泰特尔化工有限公司 | Modified nano zinc oxide doped cycloaliphatic epoxy resin light-emitting diode (LED) packaging adhesive |
| CN105440367A (en) * | 2015-12-30 | 2016-03-30 | 华南理工大学 | Epoxy resin enhanced rubber material as well as preparation method and application thereof |
| CN112863786A (en) * | 2021-01-13 | 2021-05-28 | 安徽智达电气科技有限公司 | Novel dry-type sleeve for electric power system |
| CN112940454A (en) * | 2021-02-19 | 2021-06-11 | 陕西泰普瑞电工技术有限公司 | High-temperature-resistant high-voltage partial discharge-free epoxy resin insulating material and preparation method thereof |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005272813A (en) * | 2004-02-23 | 2005-10-06 | Japan Epoxy Resin Kk | Modified epoxy resin composition and method of producing the same |
| CN102719213A (en) * | 2012-07-06 | 2012-10-10 | 江苏泰特尔化工有限公司 | Modified nano zinc oxide doped cycloaliphatic epoxy resin light-emitting diode (LED) packaging adhesive |
| CN105440367A (en) * | 2015-12-30 | 2016-03-30 | 华南理工大学 | Epoxy resin enhanced rubber material as well as preparation method and application thereof |
| CN112863786A (en) * | 2021-01-13 | 2021-05-28 | 安徽智达电气科技有限公司 | Novel dry-type sleeve for electric power system |
| CN112940454A (en) * | 2021-02-19 | 2021-06-11 | 陕西泰普瑞电工技术有限公司 | High-temperature-resistant high-voltage partial discharge-free epoxy resin insulating material and preparation method thereof |
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