A composite insulating tube, a current limiter and its processing technology

Abstract

The present invention discloses a composite insulating cylinder, a current limiter and a processing technology thereof. The processing technology of the current limiter includes S1, material preparation, S2, pretreatment and grinding, S3, drilling, S4, coating, S5, drying, S6, installation, S7, molding, S8, vacuum, S9, pouring, S10, molding and grinding, and S11, surface painting, as well as a convenient installation device. The present invention relates to the field of electric power engineering technology. The composite insulating cylinder, the current limiter and a processing technology thereof solve the problem that the short-circuit current of the busbar of the medium-voltage power grid approaches or even exceeds the breaking capacity of the circuit breaker, and the safety of breaking the phase-to-phase short-circuit fault is directly threatened. More seriously, since the anti-short-circuit capacity is not adapted to the short-circuit current level of the installation site, accidents of serious damage to large transformers above 110kVS due to external short circuits often occur. When the current limiter is installed on the surface of the composite insulating cylinder, the height of the two ends is uneven, resulting in a stuck phenomenon, and the problem that manual installation needs to be repeated.

Description

[0001] This application is a divisional application of a patent application with an application date of December 17, 2020, application number CN202011495492.8, and invention name “A composite insulating tube, current limiter and processing technology thereof”. Technical Field

[0002] The invention relates to the technical field of electric power engineering, in particular to a composite insulating cylinder, a current limiter and a processing technology thereof. Background Art

[0003] The whole composed of substations and transmission and distribution lines of various voltages in the power system is called the power grid. It includes three units: substation, transmission and distribution. The task of the power grid is to transmit and distribute electric energy and change the voltage. Among them, substation is the process of transmitting electric energy through transformers. Transformers are devices that use the principle of electromagnetic induction to change AC voltage. The main components are primary coils, secondary coils and iron cores (magnetic cores). The transmission of electric energy is an important component of the overall function of the power system. Power plants and power load centers are usually located in different regions. Power plants are built in places with suitable conditions for primary energy resources such as hydropower and coal. Through transmission, electric energy can be transmitted to load centers far away from power plants, so that the development and utilization of electric energy transcends geographical limitations. Compared with other energy transmission methods, transmission has the advantages of low loss, high efficiency, flexibility, convenience, easy adjustment and control, and reduced environmental pollution. Distribution is the link in the power system that directly connects to users and distributes electric energy to users. The distribution system consists of distribution substations, high-voltage distribution lines, distribution transformers, low-voltage distribution lines and corresponding control and protection equipment.

[0004] In addition, the short-circuit current of the medium-voltage power grid bus in the power grid is close to or even exceeds the breaking capacity of the circuit breaker, and the safety of breaking interphase short-circuit faults is directly threatened. More seriously, since the short-circuit resistance is not adapted to the short-circuit current level of the installation site, accidents of large transformers above 110kVS being seriously damaged due to external short circuits often occur. In addition, when the current limiter is installed on the surface of the composite insulation cylinder, the height of both ends will be uneven, resulting in jamming, which requires repeated manual installation. Summary of the invention

[0005] 1. Technical issues to be resolved

[0006] In view of the deficiencies in the prior art, the present invention provides a composite insulating cylinder, a current limiter and a processing technology thereof, which solve the problem that the short-circuit current of the medium-voltage power grid bus approaches or even exceeds the breaking capacity of the circuit breaker, and the safety of breaking the phase-to-phase short-circuit fault is directly threatened. What is more serious is that since the short-circuit resistance is not adapted to the short-circuit current level at the installation site, accidents in which large transformers above 110kVS are seriously damaged due to external short circuits often occur, and when the current limiter is installed on the surface of the composite insulating cylinder, the heights of the two ends are uneven, resulting in jamming, and the problem that manual repeated installation is required.

[0007] (II) Technical solution

[0008] To achieve the above objectives, the present invention is implemented through the following technical solutions: A processing technology of a current limiter comprises the following steps:

[0009] S1. Material preparation: first prepare a conductive copper plate, measure the size of the conductive copper plate, and then cut it using a cutting machine to prepare two identical conductive copper plates for standby use;

[0010] S2, pre-treatment and grinding, fix and clamp the two spare conductive copper plates, first use a coarse grinding sheet to perform rough grinding to remove large burrs on the surface and corners, and replace the grinding sheet after rough grinding to perform fine grinding to make the surface and corners of the conductive copper plates smooth and flat;

[0011] S3, drilling holes. After polishing, fix the conductive copper plate on the punching machine, first symmetrically punch the first screw holes on the upper part of the surface of the conductive copper plate, and the number of holes punched is four. Then replace the other part of the surface of the conductive copper plate, and symmetrically punch the second screw holes with a smaller drill bit, and the number of holes punched is eight.

[0012] S4, coating, applying tin plating paste on the surface of the conductive copper plate, then burning the tin into tin liquid by quenching, placing the conductive copper plate coated with the tin plating paste into the tin liquid for tin coverage, and then evenly applying the tin liquid on the surface;

[0013] S5, drying, and then drying the tin-coated conductive copper plate for the first time;

[0014] S6. Install, vertically fix the dried conductive copper plate with screws at every two second screw holes, and install eight screws symmetrically;

[0015] S7, forming, then placing the installed conductive copper plate in the inner cavity of the mold, and placing a protective film on the disc, so that the conductive copper bar is placed on the surface of the protective film, and rotating the disc to evenly wind the conductive copper bar and the protective film, ensuring that each circle of the conductive copper bar is separated by the protective film, and in the process of winding the conductive copper bar, winding lines on the surface of the conductive copper bar, so that the conductive copper bar can ensure that each circle of the conductive copper bar will not contact each other during the winding process, causing a short circuit of the current, and the conductive copper bar will not deviate, and the other end of the required conductive copper bar after winding is installed through the process of step S6 to form a current limiter device;

[0016] S8, vacuum, then remove the formed circular current limiter from the mold and the disc, and then put the current limiter device into a vacuum chamber to evacuate the air to ensure that there is no air between the conductive copper strip and the protective film;

[0017] S9, pouring, taking out the current limiter device after vacuum, putting it into a mold, pouring resin liquid on the surface of the current limiter device, so that the resin liquid enters the gap between each conductive copper strip, and the gap between the protective film and the winding line, so as to solidify the conductive copper strip and play a protective role;

[0018] S10, forming and polishing, and then polishing the surface of the restrictor device after the resin liquid solidifies to smooth the uneven surface;

[0019] S11, painting the surface, and then evenly coating the surface of the smoothed current limiter device with paint. After the coating is completed, the paint is dried for a second time.

[0020] Preferably, the drying time in steps S5 and S11 is 10-15 minutes.

[0021] Preferably, the thickness of the tin plating paste and tin liquid applied in step S4 is 2-5 mm.

[0022] The present invention also discloses a current limiter manufactured by the above-mentioned current limiter device processing technology. The current limiter device is manufactured by the above-mentioned current limiter device processing technology: it includes two conductive copper bars, and the surfaces of the two conductive copper bars are symmetrically fixed with a first screw hole and a second screw hole, and the relative hole positions of the second screw holes are symmetrically fixed with the conductive copper bars by conductive screws.

[0023] Preferably, the conductive copper strips are all wound to form a circular shape.

[0024] The present invention also discloses a composite insulating tube, which is sleeved inside the current limiter device and includes a composite insulating tube body, wherein the upper and lower ends of the composite insulating tube body are symmetrically fixedly connected with flange ports, the opposite side of the flange port is symmetrically fixedly connected with a connecting end, the opposite side of the connecting end is symmetrically provided with connecting strips, and the lower end of the surface of the composite insulating tube body is symmetrically fixedly connected with a convenient installation device.

[0025] Preferably, the convenient installation device includes a first mounting plate and a second mounting plate, the top corner of the first mounting plate is fixedly connected to a fixed plate, the surface of the second mounting plate is rotatably sleeved with a rotating rod, one end of the rotating rod is fixedly connected with a gear, the surface of the second mounting plate is slidably sleeved with a round rod, the top of the round rod is fixedly provided with a rubber pad, and the lower surface of the round rod is fixedly provided with a plurality of gear bars.

[0026] Preferably, the second mounting plate and the first mounting plate are both symmetrically fixed on the surface of the composite insulating cylinder body, and the gear and the gear bar are meshed and connected with each other.

[0027] Preferably, the connecting strip and the connecting end are fixedly connected by bolts, and the connecting end, the connecting strip and the bolts are all made of metal and are conductive.

[0028] (III) Beneficial effects

[0029] The present invention provides a composite insulating tube, a current limiter and a processing technology thereof. Compared with the prior art, the composite insulating tube has the following beneficial effects:

[0030] 1. The composite insulating cylinder, the current limiter and the processing technology thereof, the current limiter device formed by the processing technology of the current limiter S1, material preparation, S2, pretreatment and grinding, S3, punching, S4, coating, S5, drying, S6, installation, S7, molding, S8, vacuum, S9, pouring, S10, molding and grinding and S11, surface painting, and the current limiter device comprises two conductive copper bars, the surfaces of the two conductive copper bars are symmetrically fixed with a first screw hole and a second screw hole, the relative hole positions of the second screw holes are symmetrically fixedly connected with the conductive copper bars by conductive screws, so that compared with the ordinary current limiting reactor, the current limiter device overcomes the problems of huge power loss, voltage fluctuation and electromagnetic interference caused by the normal operation of the reactor, and compared with the explosive large-capacity high-speed breaking device and the parallel connection scheme of the reactor, it can avoid the problems of increased maintenance workload and increased operating cost caused by replacing disposable components, and also avoids the installation space required for the large-capacity high-speed breaking device and the increase in accident rate due to the connection busbar between the cabinet and the reactor.

[0031] 2. The composite insulating cylinder, current limiter and processing technology thereof are as follows: the current limiter device is sleeved on the surface of the composite insulating cylinder body, and when sliding downward, when one end is high and the other end is low, the rotating rod on the surface of the fixed plate is rotated to rotate the gear at one end of the rotating rod, thereby meshing and connecting with the gear bar, so that the round rod slides upward on the surface of the second mounting plate, and the rubber pad on the top of the round rod abuts against the lowest end of the current limiter device, so that the current limiter device is restored to a flat position, and the gear is reversed so that one end of the round rod is located in the inner cavity of the second mounting plate, so that the bottom of the current limiter device can abut against the surface of the second mounting plate, thereby solving the problem that when the current limiter is installed on the surface of the composite insulating cylinder, the two ends are uneven in height, resulting in jamming, and the need for manual repeated installation. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a schematic diagram of the structure of the present invention;

[0033] Figure 2 It is a schematic diagram of the structure of the composite insulating tube device of the present invention;

[0034] Figure 3 A schematic diagram of the structure of the device for convenient installation of the present invention;

[0035] Figure 4 is a schematic diagram of the structure of the current limiter device of the present invention;

[0036] Figure 5 It is a schematic diagram of the conductive copper strip and conductive copper plate structure of the present invention;

[0037] Figure 6 The figure is a process flow diagram of the current limiter processing of the present invention.

[0038] In the figure: 1. composite insulating cylinder device; 11. composite insulating cylinder body; 12. flange port; 14. connecting end; 15. connecting strip; 16. convenient installation device; 161. first mounting plate; 162. second mounting plate; 163. fixing plate; 164. rotating rod; 165. gear; 166. round rod; 167. gear bar; 168. rubber pad; 2. current limiter device; 21. conductive copper strip; 22. conductive copper plate; 23. first screw hole; 24. second screw hole; 25. conductive screw. DETAILED DESCRIPTION

[0039] The technical solutions in the embodiments of the present invention are described clearly and completely. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0040] See also Figure 6 The embodiment of the present invention provides a technical solution: a processing technology of a current limiter, comprising the following steps:

[0041] S1. Material preparation: first prepare a conductive copper plate 22, measure the size of the conductive copper plate 22, cut it using a cutting machine, and prepare two identical conductive copper plates 22 for standby use;

[0042] S2, pre-treatment and grinding, after fixing and clamping the two spare conductive copper plates 22, first use a coarse grinding sheet to perform coarse grinding to remove large burrs on the surface and corners, and replace the grinding sheet after coarse grinding to perform fine grinding to make the surface and corners of the conductive copper plates 22 smooth and flat;

[0043] S3, drilling holes, after polishing, fix it on the punching machine, first symmetrically punch the first screw holes 23 on the upper part of the surface of the conductive copper plate 22, and the number of holes punched is four, and then replace the other part of the surface of the conductive copper plate 22, and symmetrically punch the second screw holes 24 according to the smaller drill bit, and the number of holes punched is eight;

[0044] S4, coating, applying tin plating paste on the surface of the conductive copper plate 22, then quenching the tin to make tin liquid, placing the conductive copper plate 22 coated with the tin plating paste into the tin liquid to cover it with tin, and then evenly applying the tin liquid on the surface;

[0045] Tin plating and tin plating paste are coatings with good solderability and certain corrosion resistance.

[0046] S5, drying, and then drying the tin-coated conductive copper plate 22 for the first time;

[0047] S6, installation, vertically fixing and installing the dried conductive copper plate 22 with screws in every two second screw holes 24, and symmetrically installing eight screws;

[0048] S7, forming, then placing the installed conductive copper plate 22 in the inner cavity of the mold, and placing a protective film on the disc, so that the conductive copper bar 21 is placed on the surface of the protective film, and rotating the disc to evenly wind the conductive copper bar 21 and the protective film, ensuring that each circle of the conductive copper bar 21 is separated by the protective film, and in the process of winding the conductive copper bar 21, winding lines on the surface of the conductive copper bar 21, so that the conductive copper bar 21 can ensure that each circle of the conductive copper bar 21 will not contact each other during the winding process, causing a short circuit of the current and the conductive copper bar 21 will not be offset, and the other end of the required conductive copper bar 21 after winding is installed in step S6 to form another conductive copper plate 22 into a current limiter device 2;

[0049] S8, vacuum, after removing the formed circular current limiter from the mold and the disc, the current limiter device 2 is placed in a vacuum chamber to evacuate the air to ensure that there is no air between the conductive copper strip 21 and the protective film;

[0050] S9, pouring, taking out the current limiter device 2 after vacuum, putting it into a mold, pouring resin liquid on the surface of the current limiter device 2, so that the resin liquid enters the gap between each conductive copper strip 21, and the gap between the protective film and the winding line, so as to solidify the conductive copper strip 21 and play a protective role;

[0051] S10, forming and polishing, and then polishing the surface of the flow restrictor device 2 after the resin liquid solidifies to smooth the uneven surface;

[0052] S11, surface painting, and then the smoothed surface of the current limiter device 2 is evenly painted with paint. After the painting is completed, the paint is dried for the second time.

[0053] Furthermore, the drying time in steps S5 and S11 is 10-15 minutes.

[0054] Furthermore, in step S4, the thickness of the tin plating paste and tin liquid applied is 2-5 mm.

[0055] See also Figure 1-2 The embodiment of the present invention provides a technical solution: a composite insulating cylinder, the composite insulating cylinder device 1 is sleeved inside the current limiter device 2, and includes a composite insulating cylinder body 11, the upper and lower ends of the composite insulating cylinder body 11 are symmetrically fixedly connected with flange ports 12, the opposite side of the flange port 12 is symmetrically fixedly connected with a connecting end 14, the opposite side of the connecting end 14 is symmetrically provided with a connecting strip 15, the connecting strip 15 and the connecting end 14 are fixedly connected by bolts, and the connecting end 14, the connecting strip 15 and the bolts are all made of metal and are conductive.

[0056] See also Figure 3 The lower end of the surface of the composite insulating tube body 11 is symmetrically fixedly connected with a convenient installation device 16, and the convenient installation device 16 includes a first mounting plate 161 and a second mounting plate 162. The corners of the top of the first mounting plate 161 are fixedly connected with a fixing plate 163. The surface of the second mounting plate 162 is rotatably sleeved with a rotating rod 164, and one end of the rotating rod 164 is fixedly connected with a gear 165. The surface of the second mounting plate 162 is slidably sleeved with a round rod 166, and a rubber pad 168 is fixedly set on the top of the round rod 166. A plurality of gear bars 167 are fixedly set on the lower surface of the round rod 166. The second mounting plate 162 and the first mounting plate 161 are symmetrically fixed on the surface of the composite insulating tube body 11, and the gear 165 and the gear bar 167 are meshed with each other.

[0057] To facilitate the use of the installation device 16, first, the current limiter device 2 is put on the surface of the composite insulating tube 11. When sliding downward, when one end is high and the other end is low, rotate the rotating rod 164 on the surface of the fixed plate 163 to rotate the gear 165 at one end of the rotating rod 164, so that the gears 165 with the gear bar 167 are meshed with each other, so that the round rod 166 slides upward on the surface of the second mounting plate 162, and the rubber pad 168 on the top of the round rod 166 abuts against the lowest end of the current limiter device 2, so that the current limiter device 2 returns to a flat position, and reverses the gear 165 so that one end of the round rod 166 is located in the inner cavity of the second mounting plate 162, so that the bottom of the current limiter device 2 can abut against the surface of the second mounting plate 162.

[0058] See also Figure 4-6 The embodiment of the present invention provides a technical solution: a current limiter is manufactured by a current limiter device processing technology, and the current limiter device 2 includes two conductive copper bars 21, and the surfaces of the two conductive copper bars 21 are symmetrically fixed with first screw holes 23 and second screw holes 24, and the relative hole positions of the second screw holes 24 are symmetrically fixed with the conductive copper bars 21 through conductive screws 25, and the conductive copper bars 21 are all wound to form a circular shape.

[0059] Meanwhile, the contents not described in detail in this specification belong to the prior art known to those skilled in the art.

[0060] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0061] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A composite insulating tube, It is characterized in that The composite insulating cylinder (1) is sleeved inside the current limiter device (2), and comprises a composite insulating cylinder body (11), the upper and lower ends of the composite insulating cylinder body (11) are symmetrically fixedly connected with flange ports (12), the opposite side of the flange port (12) is symmetrically fixedly connected with a connecting end (14), the opposite side of the connecting end (14) is symmetrically provided with a connecting strip (15), the lower end of the surface of the composite insulating cylinder body (11) is symmetrically fixedly connected with a convenient installation device (16), the connecting strip (15) and the connecting end (14) are fixedly connected by bolts, and the connecting end (14), the connecting strip (15) and the bolts are all made of metal and are conductive; The convenient installation device (16) comprises a first installation plate (161) and a second installation plate (162); a fixing plate (163) is fixedly connected to the corner of the top of the first installation plate (161); a rotating rod (164) is rotatably sleeved on the surface of the fixing plate (163); one end of the rotating rod (164) is fixedly connected to a gear (165); a round rod (166) is slidably sleeved on the surface of the second installation plate (162); a rubber pad (168) is fixedly provided on the top of the round rod (166); a plurality of gear bars (167) are fixedly provided on the lower surface of the round rod (166); the second installation plate (162) and the first installation plate (161) are symmetrically fixed on the surface of the composite insulating cylinder body (11); and the gear (165) and the gear bar (167) are meshedly connected to each other; The current limiter device (2) is sleeved on the surface of the composite insulating cylinder body (11), and when the current limiter device (2) slides downward, when one end is higher and the other end is lower, the rotating rod (164) on the surface of the fixing plate (163) is rotated to rotate the gear (165) at one end of the rotating rod (164), thereby meshing with the gear bar (167), causing the round rod (166) to slide upward on the surface of the second mounting plate (162), causing the rubber pad (168) at the top of the round rod (166) to abut against the lowest end of the current limiter device (2), so that the current limiter device (2) is restored to a flat position, and then the gear (165) is reversed to make one end of the round rod (166) located in the inner cavity of the second mounting plate (162), so that the bottom of the current limiter device (2) abuts against the surface of the second mounting plate (162).

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