WO2022166821A1 - 一种变压器套管 - Google Patents

一种变压器套管 Download PDF

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Publication number
WO2022166821A1
WO2022166821A1 PCT/CN2022/074656 CN2022074656W WO2022166821A1 WO 2022166821 A1 WO2022166821 A1 WO 2022166821A1 CN 2022074656 W CN2022074656 W CN 2022074656W WO 2022166821 A1 WO2022166821 A1 WO 2022166821A1
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WO
WIPO (PCT)
Prior art keywords
current
rod
transformer bushing
guide rod
oil conservator
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Application number
PCT/CN2022/074656
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English (en)
French (fr)
Inventor
马斌
孙中源
高俊
Original Assignee
江苏神马电力股份有限公司
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Publication date
Application filed by 江苏神马电力股份有限公司 filed Critical 江苏神马电力股份有限公司
Publication of WO2022166821A1 publication Critical patent/WO2022166821A1/zh

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/02—Casings
    • H01F27/04—Leading of conductors or axles through casings, e.g. for tap-changing arrangements
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B17/00—Insulators or insulating bodies characterised by their form
    • H01B17/26—Lead-in insulators; Lead-through insulators
    • H01B17/28—Capacitor type

Definitions

  • the invention relates to the technical field of power transmission and transformation insulation equipment, in particular to a transformer bushing.
  • the power transformer is one of the most important and expensive key power equipment in the power system, and the transformer bushing is one of the key components of the transformer.
  • the transformer bushing uses the transformer lead wire to carry current, but for high current transformer bushing , Due to the larger diameter of the lead wire, the inner diameter of the conductive rod of the transformer bushing will increase accordingly, and the diameter of the aluminum tube of the coiled capacitor core will also increase, so it is not convenient for production and use.
  • the guide rod structure is generally used, and the capacitor core is directly wound on the current-carrying guide rod. Insert the winding shaft, and the inner diameter of the current-carrying guide rod is generally too small to match the winding shaft, and the thinner winding shaft is also likely to cause the winding shaft to rotate during the winding process.
  • the purpose of the present invention is to provide a transformer bushing, which can ensure reliable winding of the capacitor core and reliable current-carrying of the conductive rod, and at the same time ensure the stable connection and reliable cooperation between the components, and can realize Interchange of transformer bushing products of the same voltage level.
  • a transformer bushing comprising a head assembly, a central conduit, a composite outer casing and a tail assembly, and the central conduit is successively provided with the head assembly, the composite outer casing and the tail assembly,
  • the central conduit includes a current-carrying rod and a winding tube.
  • the current-carrying rod includes a first guide rod and a second guide rod. The first guide rod and the second guide rod are fixedly connected.
  • the winding tube is sleeved outside the current-carrying rod and is wound around
  • the gap between the tube and the current-carrying rod is not less than 1.5mm, and the length of the coiled tube is less than the length of the current-carrying rod.
  • the transformer bushing of the present application is provided with a current-carrying rod and a winding tube, the current-carrying rod is used to carry the current independently, and the winding tube is used to roll the capacitor core, which can ensure reliable winding of the capacitor core and convenient manufacturing.
  • the first guide rod is a solid metal round rod
  • the first guide rod includes a main body and a first connecting part
  • the outer diameter of the main body is larger than the outer diameter of the first connecting part
  • the main body is used to connect other equipment
  • the first connecting part is used for connecting other equipment. connected to the second guide rod.
  • the second guide rod is a hollow metal tube
  • the inner wall of one end of the second guide rod away from the tail assembly is provided with a first connecting groove
  • the first connecting portion is fixedly connected with the first connecting groove.
  • the head assembly includes an oil conservator and a pressing device, the pressing device is located in the oil conservator, and the end of the coiled pipe away from the tail assembly is located in the oil conservator and is fixed by the compression device, so that the coiled pipe is in the head Parts of the assembly can be fixed.
  • the pressing device includes a pressing nut, an upper pressing plate, a pressing plate spring and a lower pressing plate, the lower pressing plate abuts against the lower end inside the oil conservator, and the coiled tube passes through the pressing nut, the upper pressing plate, the pressing plate spring and the lower pressing plate in sequence. Fastened with fasteners.
  • the upper pressure plate is pressed down by tightening the compression nut, and the upper pressure plate transmits the force to the oil conservator by compressing the pressure plate spring. Since the oil conservator and the lower pressure plate are in fixed positions, the force can be applied by the pressure plate spring. The reverse acts on the upper pressure plate and the compression nut, and finally provides an upward force to the coiled tube, thereby fixing the coiled tube.
  • the oil conservator includes an oil conservator cover plate and a cabinet body, the oil conservator cover plate covers the cabinet body, and one end of the coiled pipe is sealedly connected to the oil conservator cover plate to ensure the sealing of the oil conservator.
  • the cover plate of the oil conservator is provided with a boss extending to the outside along the axis of the oil conservator, and the current-carrying rod protrudes from one end of the winding tube and is fixed outside the oil conservator by a fixing device.
  • the fixing device includes a Huff ring, a pressure The barrel and the gland, the half ring is sleeved outside the current-carrying rod and abuts the boss, the pressing barrel is covered with a half ring and abuts against the cover plate of the oil conservator, and the pressing cover seals the pressing barrel to fix the current-carrying rod.
  • the transformer bushing also includes an in-oil insulating tube, one end of the oil-in insulating tube is connected to the end of the composite jacket, the tail assembly includes a glue-fit end cap and an installation end cap, and the glue-fit end cap is connected to the other end of the oil-in insulating tube.
  • One end is connected, the upper end of the installation end cap matches the shape of the lower end of the plastic-installed end cap and is sealed and connected, the installation end cap is provided with an installation through hole, and the end of the winding tube close to the tail assembly is fixedly connected with the installation through hole to ensure that the winding tube is Parts in the tail assembly can also be fixed.
  • the tail assembly further includes a connection terminal, a second connection groove is provided on the inner wall of one end of the second guide rod close to the tail assembly, and the connection terminal is fixedly connected with the second connection groove.
  • the connection terminal is matched with the second connection groove, it can be fixedly connected by a screw thread, and the screw connection makes the connection between the connection terminal and the second guide rod more reliable, and the installation is convenient.
  • the end portion of the second guide rod connected to the terminal is further provided with a tightening nut, and the tightening nut is sleeved outside the terminal to adjust the angle of the terminal.
  • an oil passage groove is provided on the outer peripheral surface of the terminal, and the oil passage groove is opened along the axial direction of the current-carrying rod.
  • an oil passage hole is provided on the second guide rod, and the axis of the oil passage hole is perpendicular to the axis of the second guide rod.
  • a first groove is provided on the outer wall of the current-carrying rod, a guide ring is clamped in the first groove, and the outer ring surface of the guide ring protrudes from the outer wall of the current-carrying rod and abuts against the inner wall of the winding tube.
  • the guide ring is surrounded by two arc-shaped clamps to form a ring.
  • the outer diameter of the guide ring is 1 mm smaller than the inner diameter of the coiled tube.
  • the transformer bushing includes a current-carrying rod and a winding tube, the winding tube is sleeved outside the current-carrying rod, and there is a space between the winding tube and the current-carrying rod.
  • the gap, the current-carrying rod is used for current-carrying
  • the winding tube is used to roll the capacitor core.
  • the diameter of the winding tube can be set to be larger, which is convenient for the winding of the capacitor core.
  • the head assembly and the tail assembly of the bushing are fixedly connected to ensure the reliable connection between the winding tube and the current-carrying rod, thereby ensuring the reliability of the transformer bushing.
  • the transformer bushing products of the same voltage level and different current levels have the same overall dimensions and different current-carrying rod dimensions. Therefore, the coiled pipes, oil conservators and composite jackets of the same size can be designed, and only need to be set according to different currents. Different sizes of current-carrying rods can realize interchangeability of products with different current levels.
  • FIG. 1 is a schematic cross-sectional view of a transformer bushing 10 according to an embodiment of the present invention
  • Fig. 2 is the enlarged schematic diagram of part A in Fig. 1;
  • FIG. 3 is a schematic cross-sectional view of the guide ring 101 according to an embodiment of the present invention.
  • Fig. 4 is the enlarged schematic diagram of part B in Fig. 1;
  • FIG. 5 is a schematic cross-sectional view of the first guide rod 123 according to an embodiment of the present invention.
  • FIG. 6 is a schematic cross-sectional view of the second guide rod 124 according to an embodiment of the present invention.
  • Fig. 7 is the enlarged schematic diagram of C part in Fig. 1;
  • FIG. 8 is a schematic cross-sectional view of the Huff ring 1131 according to an embodiment of the present invention.
  • FIG. 9 is a schematic cross-sectional view of the pressing cylinder 1132 according to an embodiment of the present invention.
  • Figure 10 is an enlarged schematic view of part D in Figure 4.
  • Figure 11 is an enlarged schematic view of part E in Figure 1;
  • FIG. 12 is a schematic cross-sectional view of the mounting end cap 142 according to an embodiment of the present invention.
  • FIG. 13 is a schematic plan view of the connection terminal 143 according to an embodiment of the present invention.
  • connection described in the present invention, unless otherwise expressly specified or limited, should be understood in a broad sense, and may be directly connected or connected through an intermediate medium.
  • orientation or positional relationship indicated by “upper”, “lower”, “end”, “one end”, etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the purpose of It is convenient to describe the present invention and to simplify the description, rather than indicating or implying that the device or element referred to must have a particular orientation, be constructed and operate in a particular orientation, and therefore should not be construed as limiting the invention.
  • the transformer bushing 10 includes a head assembly 110 , a central conduit 120 , a composite casing 130 and a tail assembly 140 , and the central conduit 120 passes through the head assembly 110 , the composite casing 130 and the tail assembly 140 in sequence.
  • the central conduit 120 includes a coiled tube 121 and a current-carrying rod 122 .
  • the coiled tube 121 is sleeved outside the current-carrying rod 122 , and the length of the coiled tube 121 is smaller than that of the current-carrying rod 122 . Both ends of the winding tube 121 protrude from the two ends of the current-carrying rod 122 respectively, which is convenient for installation and connection with other components.
  • the transformer bushing 10 of this embodiment is provided with a winding tube 121 and a current-carrying rod 122 respectively, and the current-carrying rod 122 is used to carry the current independently, and a number of insulating layers and a number of capacitive screens are sequentially wound outside the winding tube 121 to form a capacitor
  • the core 150 can ensure reliable rolling of the capacitor core 150 and is convenient to manufacture.
  • a first groove 1221 is provided on the outer wall of the current-carrying rod 122 for clamping the guide ring 101 , and the guide ring 101 is surrounded by two arc-shaped clamps 1011 A ring-shaped piece is formed, the inner annular surfaces of the two arc-shaped clamps 1011 are clamped on the first groove 1221, and the outer annular surfaces of the two arc-shaped clamps 1011 protrude from the outer wall of the current-carrying rod 122 and abut against the coil.
  • the position is stable.
  • the two arc-shaped clamps 1011 may be semi-circular arcs with a central angle of 180°, in which case the guide ring 101 is a closed annular piece, or the arc-shaped clamps 1011 may also be inferior with a central angle of less than 180° Arc, at this time, the guide ring 101 is an annular piece with two notches, as long as the winding tube 121 and the current-carrying rod 122 can be stably isolated, no limitation is imposed here.
  • the value of the inner diameter of the coiled tube 121 and the value of the outer diameter of the current-carrying rod 122 so that the inner wall of the coiled tube 121 and the outer wall of the current-carrying rod 122 are set after the coiled tube 121 is sheathed outside the current-carrying rod 122 A gap can be formed between.
  • the outer diameter of the guide ring 101 is set according to the size of the gap. In order to facilitate installation, the outer diameter of the guide ring 101 is slightly smaller than the inner diameter of the winding tube 121 so that the guide ring 101 can be clamped on the winding tube 121 and the current-carrying rod.
  • the outer diameter of the guide ring 101 is smaller than the inner diameter of the winding tube 121 by 1 mm.
  • the cross section of the guide ring 101 can be any shape such as a circle, an ellipse, a rectangle, etc.
  • the ring width of the guide ring 101 along its radial direction is defined as the width of the guide ring 101.
  • the width of the guide ring 101, the inner diameter of the winding tube 121, and the outer diameter of the current-carrying rod 122 are set so that the gap between the inner wall of the winding tube 121 and the outer wall of the current-carrying rod 122 is not less than 1.5mm to prevent the transformer bushing During operation, the current-carrying rod 122 is deformed by force and contacts with the winding tube 121.
  • the specific value of the gap between the inner wall of the winding tube 121 and the outer wall of the current-carrying rod 122 needs to be determined according to the current-carrying condition of the transformer bushing 10, and it is necessary to ensure that the size of the gap is not less than 1.5 mm to avoid the current-carrying rod. 122 is in contact with the winding tube 121 after being deformed by force.
  • One end of the current-carrying rod 122 away from the tail assembly 140 extends out of one end of the winding tube 121 and is connected to the cable terminal 114, and the other end of the current-carrying rod 122 close to the tail assembly 140 also extends out of the other end of the winding tube 121, so that the Nut 144 is sufficiently tight against current carrying rod 122 .
  • one guide ring 101 is provided outside the current-carrying rod 122 .
  • one guide ring 101 may be provided at each end of the current-carrying rod 122 , or one guide ring 101 is provided on the current-carrying rod 122 .
  • a plurality of are arranged at intervals in the axial direction, as long as the positions of the winding tube 121 and the current-carrying rod 122 can be ensured to be relatively stable.
  • the two arc-shaped clamps 1011 are made of polytetrafluoroethylene, but of course they can also be made of other insulating materials.
  • the current-carrying rod 122 includes a first guide rod 123 and a second guide rod 124 arranged coaxially.
  • One end of the first guide rod 123 is connected to the second guide rod 123 .
  • One end of the rod 124 is fixedly connected, and one end of the first guide rod 123 that is not fixedly connected with the second guide rod 124 protrudes from the end of the winding tube 121 .
  • the first guide rod 123 is a solid metal round rod, and includes a main body 1231 and a first connecting portion 1232 arranged coaxially.
  • One end of the main body 1231 and one end of the first connecting portion 1232 are connected to each other.
  • the diameter of the connecting portion 1232 and the outer wall of the first connecting portion 1232 are provided with external threads for connecting with the second guide rod 124 .
  • the body 1231 and the first connection portion 1232 are integrally formed. In other embodiments, the body 1231 and the first connection portion 1232 may also be connected and fixed by welding or other methods. Also, in this embodiment, the main body 1231 is externally connected to the cable terminal 114 . In other embodiments, the main body 1231 and the cable terminal 114 may also be integrally formed, which is not limited herein.
  • the second guide rod 124 is a hollow metal tube, and the inner wall of one end of the second guide rod 124 away from the tail assembly 140 is provided with a first connecting groove 1241 . If the inner wall is provided with an internal thread, the first connecting portion 1232 and the first connecting groove 1241 are connected by threaded fitting, so that the first guide rod 123 and the second guide rod 124 are fixedly connected, and the threaded connection makes the first guide rod 123 and the second guide rod.
  • the connection of 124 is more reliable and the installation is more convenient.
  • the gap at the connection between the first guide rod 123 and the second guide rod 124 is further fixed by welding, so as to ensure that the first guide rod 123 and the second guide rod 124 are connected by welding.
  • the sealing performance between the two guide rods 124 is to ensure the sealing of the current-carrying rod 122 in the head assembly 110 and to ensure the reliable current-carrying.
  • the second guide rod 124 is further provided with an oil passage hole 1242, the axis of the oil passage hole 1242 is perpendicular to the axis of the second guide rod 124, and at the same time, one or more oil passage holes 1242 may be provided , so that the transformer oil can circulate in the transformer bushing 10 and avoid the overheating problem of the transformer bushing 10 .
  • the head assembly 110 includes an oil conservator 111 and a pressing device 112 , the pressing device 112 is located in the oil conservator 111 , and the end of the coiled pipe 121 away from the tail assembly 140 is located in the oil conservator 111 .
  • the portion of the coiled tube 121 inside the head assembly 110 can be fixed inside and fixed by the pressing device 112 .
  • the pressing device 112 in the oil conservator 111 sequentially includes a pressing nut 1121 , an upper pressing plate 1122 , a pressing plate spring 1123 and a lower pressing plate 1124 arranged coaxially from top to bottom (up and down in the figure), and the pressing nut
  • a first threaded hole 1125 is provided on the 1121, and the compression nut 1121 is connected to the coiled tube 121 through the first threaded hole 1125.
  • the threaded connection can ensure a stable connection.
  • the center of the upper pressing plate 1122 and the lower pressing plate 1124 is provided with a first through hole 1126 for passing the winding tube 121 therethrough.
  • the upper pressing plate 1122 is also provided with a plurality of second through holes 1127, the plurality of second through holes 1127 are circumferentially distributed around the winding tube 121, the lower pressing plate 1124 is provided with a plurality of second threaded holes 1128, and the plurality of second threaded holes 1128 surround the winding tube 121.
  • the pipes 121 are distributed around the circumference, and the number of the second threaded holes 1128 and the second through holes 1127 are the same and the positions of the two are matched.
  • a plurality of pressure plate springs 1123 are sequentially disposed between the second threaded holes 1128 and the second through holes 1127 in one-to-one correspondence.
  • the second thread Fasteners are inserted in the hole 1128 and the second through hole 1127 to fix the pressing device 112 .
  • the lower surface of the lower pressing plate 1124 abuts against the inner surface of the oil conservator 111 .
  • the lower pressing plate 1124 At the lower end, ensure that the lower pressing plate 1124 is firmly set in the oil conservator 111, and can provide upward force to the winding tube 121 (ie, toward the head assembly 110), and fix the winding tube 121 to prevent it from being trapped in the transformer bushing 10. Deflection occurs during operation; at the same time, after the lower pressing plate 1124 is in contact with the oil conservator 111 , the coiled tube 121 can be electrically connected to the oil conservator 111 without any additional connection device, thereby preventing the occurrence of suspension discharge.
  • the oil conservator 111 includes an oil conservator cover 1111 and a cabinet body 1112 , the oil conservator cover 1111 covers the cabinet body 1112 , and the center of the oil conservator cover 1111 is provided with
  • the third through hole 1113 is used to pass through the central conduit 120 , and the central conduit 120 is sealedly connected to the oil conservator cover 1111 .
  • the oil conservator cover plate 1111 also includes a first boss 1114 extending along the outer circumference of the third through hole 1113 toward the outside of the oil conservator cover plate 1111 , that is, the first boss 1114 is cylindrical, and the third through hole 1113
  • the cabinet body 1112 and the first boss 1114 are communicated.
  • the part of the central conduit 120 sealed with the oil conservator cover 1111 is the winding tube 121.
  • the end of the winding tube 121 away from the tail assembly 140 is located in the third through hole 1113, that is, the winding tube 121 is far away from the tail assembly.
  • the outer wall of one end of 140 is in contact with the inner wall of the third through hole 1113 and is connected in a sealed manner.
  • the inner wall of the third through hole 1113 is provided with a first sealing groove 11141 , a first sealing member (not shown) is provided in the first sealing groove 11141 , and the winding tube 121 is sleeved outside the current-carrying rod 122 Afterwards, the end of the winding tube 121 away from the tail assembly 140 is sealed with the inner wall of the third through hole 1113 through a first sealing member, and the first sealing grooves 11141 can be arranged at one or spaced intervals along the axial direction of the third through hole 1113 Set more than one, and there is no limit here.
  • the number of the first sealing member is one or more, the first sealing member is a rubber sealing ring, and the first sealing member is fixed in the first sealing groove 11141 by resin or silicone bonding.
  • the sealing member can also be fixed in the first sealing groove 11141 by using other materials, or by using other bonding methods, which is not limited here.
  • a first pin hole (not shown) is provided on the outer peripheral surface of the first boss 1114, and the axis of the first pin hole and the axis of the transformer bushing 10 are perpendicular to each other, as shown in FIG. 5 .
  • the first guide rod 123 is provided with a second pin hole 1234, and the axis of the second pin hole 1234 is perpendicular to the axis of the transformer bushing 10. After the first pin hole and the second pin hole 1234 are aligned, a pin is inserted at the same time, and the first pin hole is aligned with the second pin hole 1234.
  • a guide rod 123 is fixed to the cover plate 1111 of the oil conservator, which can prevent the current-carrying rod 122 from being deflected during the operation of the transformer bushing 10 .
  • the head assembly 110 further includes a fixing device 113 , and the current-carrying rod 122 extends out of the end of the winding tube 121 away from the tail assembly 140 and is fixed outside the oil conservator 111 by the fixing device 113 , and the current-carrying rod 122 is fixed outside the oil conservator 111 through the fixing device 113 .
  • the part of the rod 122 extending out of the winding tube 121 is the upper part of the main body 1231 of the first guide rod 123 , that is, the upper part of the main body 1231 is fixed outside the oil conservator 111 by the fixing device 113 .
  • the fixing device 113 includes a Huff ring 1131 , a pressing cylinder 1132 and a pressing cover 1133 .
  • the outer wall of the first guide rod 123 is provided with a second groove 1233
  • the Huff ring 1131 is composed of two semicircular hoop rings 11311 , one of which is Both ends of the semicircular hoop 11311 are provided with a threaded hole, and two ends of the other semicircular hoop 11311 are provided with bolt holes corresponding to the threaded holes.
  • the two semicircular hoop 11311 are clamped on the first After the two grooves 1233 are installed, the butt joints are performed, and the two pairs of bolt holes and threaded holes are pierced through bolts for fastening, so that the half ring 1131 is fixed outside the first guide rod 123, and the half ring 1131 is close to the oil conservator 111.
  • One end face of the first boss 1114 abuts against the upper end face of the first boss 1114 , so that the first guide rod 123 is fixed relative to the oil conservator 111 .
  • the Huff ring can also be composed of a sub-arc-shaped hoop, which is not limited herein.
  • a pressure cylinder 1132 is provided on the Huff ring 1131 , and the pressure cylinder 1132 is a cylindrical structure, and its axial cross section In the shape of a trapezoid, the pressure cylinder 1132 completely covers the Huff ring 1131 in the pressure cylinder 1132 , and the pressure cylinder 1132 is fixedly connected with the cover plate 1111 of the oil conservator.
  • the pressure cylinder 1132 includes a cylinder body 11321 and an extension portion 11322 extending along the circumferential direction of the cylinder body 11321.
  • the center of the pressure cylinder 1132 is further provided with a fourth through hole 11323, and the inner wall of the fourth through hole 11323 is provided with a second sealing groove 11324, the second sealing groove 11324 is provided with a second sealing member (not shown in the figure), and the first guide rod 123 is passed through the fourth through hole 11323 to achieve a sealing connection through the second sealing member.
  • the center of the pressing cylinder 1132 is also provided with a fifth through hole 11325 coaxial with the fourth through hole 11323, and the diameter of the fifth through hole 11325 is larger than that of the fourth through hole 11323 , the fourth through hole 11323 is set away from the lower end face of the pressing cylinder 1132, the fifth through hole 11325 is set close to the lower end face of the pressing cylinder 1132, the connection between the fourth through hole 11323 and the fifth through hole 11325 forms a stepped surface, and the pressing cylinder 1132
  • the Huff ring 1131 is covered in the cavity formed by the stepped surface and the lower end surface of the pressing cylinder 1132 , so that the lower end surface of the extension part 11322 abuts the upper end surface of the oil conservator cover 1111 .
  • the extension portion 11322 distributes several connecting holes (not shown) in a circle around the axis of the pressing cylinder 1132, and the cover plate 1111 of the oil conservator is provided with countersunk holes corresponding to the several connecting holes, which are pierced by fasteners. Connecting holes and countersinks are provided to securely connect the pressing cylinder 1132 to the cover plate 1111 of the oil conservator.
  • the bottom surface of the pressing cylinder 1132 is further provided with a third groove 11326
  • the oil conservator cover plate 1111 is also provided with a second boss 1115
  • the lower end surface of the extension portion 11322 abuts the oil conservator cover plate 1111
  • the third groove 11326 is matched and covered with the second boss 1115
  • the second boss 1115 is provided with a third sealing groove 1116
  • a third sealing member is set in the third sealing groove 1116 (not shown in the figure). shown) to further ensure the sealing of the oil conservator 111 and prevent external water vapor from entering the oil conservator 111.
  • a pressure cover 1133 is provided on the upper end surface of the pressure cylinder 1132, and the pressure cover 1133 covers the pressure cylinder 1132 through fasteners, and the connection method is the same as that of the pressure cylinder 1132 and the oil conservator cover plate 1111. The connection method is the same and will not be repeated here.
  • the upper end surface of the pressing cylinder 1132 is provided with a fourth sealing groove 11327, and a fourth sealing member (not shown) is arranged in the fourth sealing groove 11327 to ensure the sealing between the pressing cover 1133 and the pressing cylinder 1132.
  • the material and bonding method of the second sealing member, the third sealing member and the fourth sealing member are the same as those of the first sealing member, and the second sealing groove 11324 can be set to one or more than one. No longer.
  • the transformer bushing 10 further includes an in-oil insulating tube 160 , and one end of the oil-in insulating tube 160 away from the tail assembly 140 is connected to the end of the composite jacket 130 close to the tail assembly 140 , the tail assembly 140 includes a glued end cap 141 and an installation end cap 142, the glued end cap 141 is fixedly sleeved on the end of the oil insulator tube 160 close to the tail assembly 140, and the glued end cap 141 is connected to the oil insulator tube 160 The outer peripheral surface and the end surface near the other end of the tail assembly 140 are sealedly connected.
  • a fifth sealing groove 1411 is provided on the end surface of the glue-installed end cap 141 in contact with the in-oil insulating tube 160 .
  • a fifth sealing member (not shown) is arranged in the groove 1411 to seal and fix the glued end cap 141 and the oil-in-oil insulating tube 160 .
  • the upper end of the mounting end cap 142 and the lower end of the glued end cap 141 are matched in shape and are connected in a sealed manner.
  • a sixth sealing member (not shown) is arranged in the sixth sealing groove 1421 , so that the installation end cap 142 and the glue-installed end cap 141 are sealed and fixed.
  • an installation through hole 1422 is formed in the center of the installation end cover 142 , and the end of the winding tube 121 close to the tail assembly 140 passes through the installation through hole 1422 and is fixedly connected to the installation end cover 142 .
  • the mounting through hole 1422 is provided with an internal thread near the inner wall of the glued end cap 141 , and the outer thread is provided on the outer periphery of the end of the winding tube 121 near the end assembly 140 , and the winding tube 121 is threadedly connected with the mounting through hole 1422 , and the mounting A seventh sealing groove 1423 is provided on the inner wall of the side of the hole 1422 away from the glue-installed end cap 141 , and a seventh sealing member (not shown) is arranged in the seventh sealing groove 1423 to seal between the winding tube 121 and the installation end cap 142 Fixing means that the part of the winding tube 121 close to the tail assembly 140 can also be sealed and fixed to prevent external water vapor from entering the transformer bushing 10 from the tail of the transformer bushing 10 .
  • the material and bonding method of the fifth sealing member, the sixth sealing member, and the seventh sealing member are the same as those of the first sealing member, and the seventh sealing groove 1423 can be set to one or more than one, No longer.
  • the tail assembly 140 further includes a connection terminal 143 .
  • a second connection groove 1243 is provided on the inner wall of one end of the second guide rod 124 close to the tail assembly 140 , and the connection terminal 143 is connected to the second connection groove. 1243 is connected, so that the connection terminal 143 is fixedly connected with the second guide rod 124 .
  • the end of the second guide rod 124 connected to the terminal 143 is also provided with a tightening nut 144, and the tightening nut 144 is sleeved outside the terminal 143 and abuts the end of the second guide rod 124 close to the tail assembly 140, The second guide rod 124 is locked with the connection terminal 143, and the angle of the connection terminal 143 can be adjusted arbitrarily.
  • the terminal 143 includes a second connecting portion 1431 , a baffle 1432 and a mounting plate 1433 , the second connecting portion 1431 is a cylinder, and the baffle 1432 and the mounting plate 1433 are both It is a thin plate, one end of the second connecting portion 1431 is connected to one side of the baffle 1432, one end of the mounting plate 1433 is connected to the other side of the baffle 1432, and the mounting plate 1433 is provided with a wiring hole (not shown) for For connecting transformer winding leads.
  • the second connection portion 1431 , the baffle plate 1432 and the mounting plate 1433 are integrally formed, and of course, they can also be connected and fixed to each other in other forms such as welding.
  • the outer peripheral surface of the second connection portion 1431 is provided with an external thread
  • the inner wall of the second connection groove 1243 is provided with an internal thread.
  • the end of the second connecting portion 1431 connected to the baffle 1432 is further provided with a fourth groove, so that a gap 1435 is formed between the second connecting portion 1431 and the baffle 1432 .
  • the oil passage 1436 is opened along the axial direction of the second connecting portion 1431, that is, along the axial direction of the current-carrying rod 122.
  • the oil passage 1436 can be provided with one or evenly distributed. Since the transformer bushing 10 in the test is arranged vertically (in the direction in the figure), the transformer oil can flow out from the gap 1435 along the oil passage 1436, so that the transformer bushing 10 is drained out of the remaining transformer oil in the current-carrying rod 122 during the test. , which is convenient for secondary packaging and transportation.
  • a third pin hole 1424 is further provided on the outer peripheral surface of the installation end cover 142 , the axis of the third pin hole 1424 is perpendicular to the axis of the transformer bushing 10 , and the winding tube 121 is connected to the third pin hole 1424 .
  • the corresponding side of the hole 1424 is also provided with a fourth pin hole (not shown in the figure). The winding tube 121 is deflected during operation of the transformer bushing 10 .
  • the transformer bushing 10 provided in this embodiment includes a current-carrying rod 122 and a coiled tube 121.
  • the coiled tube 121 is sleeved outside the current-carrying rod 122, and a gap is left between the coiled tube 121 and the current-carrying rod 122.
  • the flow rod 122 is used for carrying current, and the winding tube 121 is used for winding the capacitor core 150 .
  • the diameter of the winding tube 121 can be set to be larger, which, on the one hand, facilitates the winding of the capacitor core 150;
  • the rods 122 are of different sizes, so the coiled tube 121, the oil conservator 111 and the composite jacket 130 of the same size can be designed.
  • the winding tube 121 and the current-carrying rod 122 are sealed and fixedly connected with the head assembly 110 and the tail assembly 140 of the transformer bushing 10 respectively, so as to ensure the reliable connection between the winding tube 121 and the current-carrying rod 122, thereby ensuring the transformer bushing 10 overall reliability.

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  • Housings And Mounting Of Transformers (AREA)

Abstract

本发明公开一种变压器套管，包括头部组件、中心导管、复合外套和尾部组件，中心导管依次穿设头部组件、复合外套和尾部组件，中心导管包括载流杆和卷绕管，载流杆包括第一导杆和第二导杆，第一导杆和第二导杆固定连接，卷绕管套设在载流杆外，卷绕管与载流杆之间的间隙不小于1.5mm，卷绕管的长度小于载流杆的长度。本发明的变压器套管结构简单，能够保证电容芯子卷制可靠和导电杆载流可靠，同时保证各零部件之间连接稳固、配合可靠，以及可实现同电压等级变压器套管产品的互换，具有通用性。

Description

一种变压器套管 技术领域
本发明涉及输变电绝缘设备技术领域，特别是涉及一种变压器套管。
背景技术
电力变压器是电力系统中最为重要且价格昂贵的关键电力设备之一，而变压器套管是变压器的关键零部件之一，目前变压器套管采用变压器引出线进行载流，但是对于大电流变压器套管，由于引出线直径较大，则变压器套管的导电杆内径相应增大，同时卷制电容芯子的铝管直径也要增大，因此不便于生产与使用。
另外，对于大电流变压器套管来说，一般情况下采用导杆式结构，其电容芯子直接卷绕在载流导杆上，整卷的电容芯子在卷绕时需在卷绕管中间插入卷绕轴，而载流导杆内径一般较小无法匹配卷绕轴，而较细的卷绕轴也容易导致在卷绕过程中发生卷绕轴自转。
发明内容
针对现有技术的不足，本发明的目的在于提供一种变压器套管，能够保证电容芯子卷制可靠和导电杆载流可靠，同时保证各零部件之间连接稳固、配合可靠，且可实现同电压等级变压器套管产品的互换。
为实现上述发明目的，本发明所采用的技术手段如下：一种变压器套管，包括头部组件、中心导管、复合外套和尾部组件，中心导管依次穿设头部组件、复合外套和尾部组件，中心导管包括载流杆和卷绕管，载流杆包括第一导杆和第二导杆，第一导杆和第二导杆固定连接，卷绕管套设在载流杆外，卷绕管与载流杆之间的间隙不小于1.5mm，卷绕管的长度小于载流杆的长度。本申请的变压器套管设置载流杆和卷绕管，通过载流杆单独进行载流，通过卷绕管进行电容芯子卷制，能够保证电容芯子的卷制可 靠，制造方便。
优选地，第一导杆为实心金属圆杆，第一导杆包括本体和第一连接部，本体的外径大于第一连接部的外径，本体用于连接其他设备，第一连接部用于与第二导杆连接。
优选地，第二导杆为空心金属管，第二导杆远离尾部组件的一端内壁设置第一连接槽，第一连接部与第一连接槽固定连接。第一连接部与第一连接槽配合后可以通过螺纹连接使第一导杆与第二导杆固定连接，螺纹连接使第一导杆与第二导杆的连接更可靠，且安装方便。
优选地，头部组件包括储油柜和压紧装置，压紧装置位于储油柜内，卷绕管远离尾部组件的一端位于储油柜内且通过压紧装置固定，使卷绕管在头部组件的部分能够固定。
优选地，压紧装置包括压紧螺母、上压板、压板弹簧和下压板，下压板抵接储油柜内部的下端，卷绕管依次穿设压紧螺母、上压板、压板弹簧和下压板后通过紧固件固定。在安装过程中，通过旋紧压紧螺母，将上压板向下压，上压板通过压缩压板弹簧，将力传递给储油柜，由于储油柜和下压板位置固定，可以通过压板弹簧将力反向作用在上压板及压紧螺母上，最终提供给卷绕管向上的力，从而将卷绕管进行固定。
优选地，储油柜包括储油柜盖板和柜体，储油柜盖板封盖柜体，卷绕管的一端与储油柜盖板密封连接，保证储油柜的密封。
优选地，储油柜盖板沿储油柜的轴线向外侧延伸有凸台，载流杆伸出卷绕管的一端后通过固定装置固定在储油柜外，固定装置包括哈夫环、压筒和压盖，哈夫环套接于载流杆外并抵接凸台，压筒罩设哈夫环并抵接储油柜盖板，压盖封盖压筒，使载流杆固定。
优选地，变压器套管还包括油中绝缘管，油中绝缘管的一端与复合外套的端部连接，尾部组件包括胶装端盖和安装端盖，胶装端盖与油中绝缘管的另一端连接，安装端盖的上端部与胶装端盖的下端部形状匹配且密封连接，安装端盖设置安装通孔，卷绕管靠近尾部组件的一端与安装通孔固定连接，保证卷绕管在尾部组件的部分也能够固定。
优选地，尾部组件还包括接线端子，第二导杆靠近尾部组件的一端内 壁设置第二连接槽，接线端子与第二连接槽固定连接。接线端子与第二连接槽配合后可以通过螺纹固定连接，螺纹连接使接线端子与第二导杆的连接更可靠，且安装方便。
优选地，第二导杆与接线端子连接的端部还设有并紧螺母，且并紧螺母套接于接线端子外，用于调节接线端子的角度。
优选地，接线端子的外周面上设有通油槽，通油槽沿载流杆的轴向开设。
优选地，第二导杆上设有通油孔，通油孔的轴线与第二导杆的轴线相互垂直。
优选地，载流杆的外壁上设置第一凹槽，第一凹槽中卡设导向环，导向环的外环面凸出载流杆的外壁且抵靠卷绕管的内壁。
优选地，导向环由两个弧形卡箍包围组成环状件。
优选地，导向环的外径比卷绕管的内径小1mm。
本申请的有益效果是：区别于现有技术的情况，变压器套管包括载流杆和卷绕管，卷绕管套设在载流杆外，且卷绕管与载流杆之间留有空隙，载流杆用于载流，卷绕管用于卷制电容芯子，卷绕管的直径可设置为较大，便于电容芯子的卷制，且卷绕管和载流杆分别与变压器套管的头部组件和尾部组件固定连接，保证卷绕管和载流杆的连接可靠，从而保证变压器套管的可靠性。同时，同等电压等级、不同电流等级的变压器套管产品，其外形尺寸一致、载流杆尺寸不一致，因此可设计相同尺寸的卷绕管、储油柜和复合外套等，仅需根据不同电流设置不同尺寸的载流杆，即可实现不同电流等级产品的互换。
附图说明
图1是本发明一实施方式的变压器套管10的剖面示意图；
图2是图1中A部分的放大示意图；
图3是本发明一实施方式的导向环101的剖面示意图；
图4是图1中B部分的放大示意图；
图5是本发明一实施方式的第一导杆123的剖面示意图；
图6是本发明一实施方式的第二导杆124的剖面示意图；
图7是图1中C部分的放大示意图；
图8是本发明一实施方式的哈夫环1131的剖面示意图；
图9是本发明一实施方式的压筒1132的剖面示意图；
图10是图4中D部分的放大示意图；
图11是图1中E部分的放大示意图；
图12是本发明一实施方式的安装端盖142的剖面示意图；
图13是本发明一实施方式的接线端子143的平面示意图。
具体实施方式
根据要求，这里将披露本发明的具体实施方式。然而，应当理解的是，这里所披露的实施方式仅仅是本发明的典型例子而已，其可体现为各种形式。因此，这里披露的具体细节不被认为是限制性的，而仅仅是作为权利要求的基础以及作为用于教导本领域技术人员以实际中任何恰当的方式不同地应用本发明的代表性的基础，包括采用这里所披露的各种特征并结合这里可能没有明确披露的特征。
本发明中所述的“连接”，除非另有明确的规定或限定，应作广义理解，可以是直接相连，也可以是通过中间媒介相连。在本发明的描述中，需要理解的是，“上”、“下”、“端部”、“一端”等指示的方位或位置关系为基于附图所示的方位或位置关系，仅是为了便于描述本发明和简化描述，而不是指示或暗示所指的装置或元件必须具有特定的方位、以特定的方位构造和操作，因此不能理解为对本发明的限制。
如图1所示，变压器套管10包括头部组件110、中心导管120、复合外套130和尾部组件140，中心导管120依次穿设头部组件110、复合外套130和尾部组件140。中心导管120包括卷绕管121和载流杆122，卷绕管121套设在载流杆122外，且卷绕管121的长度小于载流杆122的长度。卷绕管121的两端分别伸出载流杆122的两端，便于与其他部件安装连接。本实施方式的变压器套管10分别设置卷绕管121和载流杆122，通过载流杆122单独进行载流，以及在卷绕管121外依次卷绕若干绝缘层和 若干电容屏，形成电容芯子150，能够保证电容芯子150的卷制可靠，制造方便。
在一应用场景中，结合图1、图2和图3，载流杆122的外壁上设置第一凹槽1221，用于卡设导向环101，导向环101由两个弧形卡箍1011包围组成一个环状件，两个弧形卡箍1011的内环面卡设在第一凹槽1221上，两个弧形卡箍1011的外环面凸出载流杆122的外壁且抵靠卷绕管121的内壁，从而使卷绕管121和载流杆122之间留有间隙，即卷绕管121和载流杆122不直接接触，保证了卷绕管121和载流杆122的相对位置稳定。其中，两个弧形卡箍1011可以是圆心角为180°的半圆弧，此时导向环101为一个封闭的环状件，或者弧形卡箍1011也可以是圆心角小于180°的劣弧，此时导向环101为带有两个缺口的环状件，只要能够实现卷绕管121和载流杆122的稳定隔离即可，在此不作限制。
在实际生产时，设定卷绕管121的内径数值和载流杆122的外径数值，使得卷绕管121套在载流杆122外后卷绕管121的内壁与载流杆122的外壁之间能够形成间隙。同时根据间隙的大小设定导向环101的外径数值，为便于安装，导向环101的外径略小于卷绕管121的内径以使得导向环101能够卡设在卷绕管121和载流杆122之间，但需保证导向环101能够抵靠卷绕管121以实现卷绕管121和载流杆122的稳定隔离。在一实施方式中，导向环101的外径比卷绕管121的内径小1mm。
由于导向环101为环状件，导向环101的横截面可以是圆形、椭圆形、长方形等任意形状，同时将导向环101沿其径向的环宽定义为导向环101的宽度，通过对导向环101宽度、卷绕管121的内径、载流杆122的外径的设置，使卷绕管121的内壁与载流杆122的外壁之间的间隙不小于1.5mm，防止在变压器套管10运行中，载流杆122发生受力变形而与卷绕管121接触。当然，卷绕管121的内壁与载流杆122的外壁之间的间隙的具体数值需要根据变压器套管10的载流情况而定，同时需要保证间隙的大小不小于1.5mm以避免载流杆122发生受力变形后与卷绕管121接触。载流杆122远离尾部组件140的一端伸出卷绕管121的一端外并连接电缆端子114，载流杆122靠近尾部组件140的另一端也伸出卷绕管121的另 一端，使并紧螺母144充分与载流杆122并紧。
在一应用场景中，导向环101在载流杆122外设置一个，在其他应用场景中，导向环101也可以在载流杆122的两端各设置一个，或者导向环101在载流杆122的轴向上间隔设置多个，只要能保证卷绕管121和载流杆122的位置相对稳定即可。
需要说明的是，本实施方式中，两个弧形卡箍1011由聚四氟乙烯制成，当然也可以由其他绝缘材料制成。
在一应用场景中，结合图1、图4和图5所示，载流杆122包括同轴设置的第一导杆123和第二导杆124，第一导杆123的一端与第二导杆124的一端固定连接，第一导杆123不与第二导杆124固定连接的一端伸出卷绕管121的端部。具体地，第一导杆123为实心金属圆杆，包括同轴设置的本体1231和第一连接部1232，本体1231的一端与第一连接部1232的一端相互连接，本体1231的直径大于第一连接部1232的直径，第一连接部1232的外壁设置外螺纹，用于与第二导杆124连接。
在本实施方式中，本体1231与第一连接部1232一体成型，在其他实施方式中，本体1231与第一连接部1232也可以通过焊接或者其他方式连接固定。以及，本实施方式中，本体1231外套接电缆端子114，在其他实施方式中，本体1231与电缆端子114也可以一体成型，在此不做限制。
进一步地，结合图1、图4至图6所示，第二导杆124为空心金属管，第二导杆124远离尾部组件140的一端内壁设置第一连接槽1241，第一连接槽1241的内壁设置内螺纹，则第一连接部1232与第一连接槽1241通过螺纹配合连接，使第一导杆123与第二导杆124固定连接，螺纹连接使第一导杆123与第二导杆124的连接更可靠，安装更方便。
在一实施场景中，第一导杆123与第二导杆124螺纹连接后，在第一导杆123与第二导杆124连接处的缝隙进一步通过焊接固定，保证第一导杆123与第二导杆124之间的密封性能，即保证载流杆122在头部组件110内的密封，并保证载流可靠。
在另一实施场景中，第二导杆124上还设有通油孔1242，通油孔1242的轴线与第二导杆124的轴线相互垂直，同时，通油孔1242可以设置一 个或者多个，使变压器油在变压器套管10内能够循环流动，避免变压器套管10产生过热问题。
如图1和图7所示，头部组件110包括储油柜111和压紧装置112，压紧装置112位于储油柜111内，卷绕管121远离尾部组件140的一端位于储油柜111内且通过压紧装置112固定，使卷绕管121在头部组件110内的部分能够固定。
具体地，压紧装置112在储油柜111内由上至下(图中的上下方向)依次包括同轴设置的压紧螺母1121、上压板1122、压板弹簧1123和下压板1124，压紧螺母1121上设有第一螺纹孔1125，压紧螺母1121通过第一螺纹孔1125与卷绕管121连接，螺纹连接能够保证连接稳固，通过旋紧压紧螺母1121，使卷绕管121固定。上压板1122和下压板1124的中心均设有第一通孔1126，用于卷绕管121的穿设。上压板1122上还设有若干第二通孔1127，若干第二通孔1127围绕卷绕管121呈圆周分布，下压板1124上设有若干第二螺纹孔1128，若干第二螺纹孔1128围绕卷绕管121呈圆周分布，第二螺纹孔1128与第二通孔1127的数量相同且两者位置相匹配。同时，若干压板弹簧1123依次设置于一一对应的第二螺纹孔1128与第二通孔1127之间。卷绕管121依次穿设第一螺纹孔1125、上压板1122上的第一通孔1126、若干圆周分布的压板弹簧1123的中心和下压板1124上的第一通孔1126后，在第二螺纹孔1128和第二通孔1127内穿设紧固件将压紧装置112固定，压紧螺母1121与卷绕管121通过螺纹旋紧后，下压板1124的下表面抵接储油柜111内部的下端，确保下压板1124稳固设置在储油柜111内，能够提供给卷绕管121向上(即朝向头部组件110方向)的力，将卷绕管121进行固定，防止其在变压器套管10运行过程中发生偏转；同时，下压板1124与储油柜111接触后，无需额外的连接装置就能使卷绕管121与储油柜111电连接，从而防止发生悬浮放电。
进一步地，结合图1和图4所示，储油柜111包括储油柜盖板1111和柜体1112，储油柜盖板1111封盖柜体1112，储油柜盖板1111的中心设有第三通孔1113，用于穿设中心导管120，且中心导管120与储油柜盖板1111密封连接。同时，储油柜盖板1111还包括沿第三通孔1113的外 周向储油柜盖板1111外侧延伸的第一凸台1114，即第一凸台1114呈圆筒状，第三通孔1113连通柜体1112和第一凸台1114。且中心导管120与储油柜盖板1111密封连接的部分为卷绕管121，具体地，卷绕管121远离尾部组件140的一端位于第三通孔1113内，即卷绕管121远离尾部组件140的一端的外壁与第三通孔1113的内壁接触且密封连接。在一应用场景中，第三通孔1113的内壁设置第一密封槽11141，第一密封槽11141内设有第一密封件(图未示)，卷绕管121套设在载流杆122外后，卷绕管121远离尾部组件140的一端与第三通孔1113的内壁通过第一密封件实现密封连接，且第一密封槽11141可以沿第三通孔1113的轴向设置为一个或者间隔设置多个，在此不做限制。
在一应用场景中，第一密封件的数量为一个或者多个，第一密封件为橡胶密封圈，且第一密封件通过树脂或者硅胶粘接固定在第一密封槽11141内，当然第一密封件也可以采用其他材料，或者采用其他粘接方式固定在第一密封槽11141内，在此不做限制。
在另一实施场景中，第一凸台1114的外周面上设有第一销孔(图未示)，第一销孔的轴线与变压器套管10的轴线相互垂直，结合图5所示，第一导杆123上设有第二销孔1234，第二销孔1234的轴线与变压器套管10的轴线相互垂直，第一销孔与第二销孔1234对齐后同时穿设销钉，将第一导杆123与储油柜盖板1111固定，可防止载流杆122在变压器套管10运行过程中发生偏转。
继续参阅图1和图4，头部组件110还包括固定装置113，载流杆122伸出卷绕管121远离尾部组件140的一端后通过固定装置113固定在储油柜111外，且载流杆122伸出卷绕管121的部分为第一导杆123的本体1231的上部，也就是说，本体1231的上部通过固定装置113固定在储油柜111外。固定装置113包括哈夫环1131、压筒1132和压盖1133。具体地，结合图1、图4、图5和图8所示，第一导杆123的外壁设有第二凹槽1233，哈夫环1131由两个半圆形箍环11311组成，其中一个半圆形箍环11311的两端各设有一个螺纹孔，另一个半圆形箍环11311的两端设有与螺纹孔对应匹配的螺栓孔，两个半圆形箍环11311卡设在第二凹槽1233上后进 行对接配合，并通过两对螺栓孔、螺纹孔穿设螺栓进行紧固，将哈夫环1131固定在第一导杆123外，且哈夫环1131靠近储油柜111的一侧端面抵接第一凸台1114的上端面，从而使第一导杆123相对储油柜111固定。
在其他实施方式中，哈夫环也可以由呈劣弧形的箍环组成，在此不作限制。
继续结合图1、图4、图9和图10所示，为进一步加强第一导杆123的固定，在哈夫环1131外套设压筒1132，压筒1132为筒状结构，其轴向截面为梯形，压筒1132将哈夫环1131完全罩设在压筒1132内，且压筒1132与储油柜盖板1111固定连接。具体地，压筒1132包括筒体11321和沿筒体11321周向延伸的延伸部11322，压筒1132的中心还设有第四通孔11323，第四通孔11323的内壁设有第二密封槽11324，第二密封槽11324内设有第二密封件(图未示)，第一导杆123穿设第四通孔11323后通过第二密封件实现密封连接。同时，为了罩设哈夫环1131，压筒1132的中心还设有与第四通孔11323同轴设置的第五通孔11325，且第五通孔11325的直径大于第四通孔11323的直径，第四通孔11323远离压筒1132的下端面设置，第五通孔11325靠近压筒1132的下端面设置，第四通孔11323与第五通孔11325的连接处形成台阶面，压筒1132将哈夫环1131罩设在该台阶面与压筒1132下端面形成的空腔内，使延伸部11322的下端面抵接储油柜盖板1111的上端面。
在一应用场景中，延伸部11322围绕压筒1132的轴线呈圆周分布若干连接孔(图未示)，储油柜盖板1111上设有与若干连接孔对应的沉孔，通过紧固件穿设连接孔和沉孔，将压筒1132与储油柜盖板1111固定连接。
在另一应用场景中，压筒1132的底面还设有第三凹槽11326，储油柜盖板1111上还设有第二凸台1115，延伸部11322的下端面抵接储油柜盖板1111的上端面时，第三凹槽11326与第二凸台1115匹配盖合，且第二凸台1115上设有第三密封槽1116，第三密封槽1116内设置第三密封件(图未示)，进一步确保储油柜111的密封，防止外部水汽等进入储油柜111内。
进一步地，为了使压筒1132固定，压筒1132的上端面设有压盖1133， 压盖1133通过紧固件封盖压筒1132，其连接方式同压筒1132与储油柜盖板1111的连接方式一致，不再赘述。为了加强密封，压筒1132的上端面设有第四密封槽11327，第四密封槽11327内设有第四密封件(图未示)，保证压盖1133与压筒1132之间的密封。
需要说明的是，第二密封件、第三密封件、第四密封件与第一密封件的材质、粘接方式一致，且第二密封槽11324可以设置为一个，也可以设置为多个，不再赘述。
进一步地，如图1、图11和图12所示，变压器套管10还包括油中绝缘管160，油中绝缘管160远离尾部组件140的一端与复合外套130靠近尾部组件140的端部连接，尾部组件140包括胶装端盖141和安装端盖142，胶装端盖141固定套设在油中绝缘管160靠近尾部组件140的端部，且胶装端盖141与油中绝缘管160靠近尾部组件140的另一端的外周面和端面密封连接。具体地，胶装端盖141与油中绝缘管160接触的端面设有第五密封槽1411，胶装端盖141与油中绝缘管160的外周面通过胶装固定的同时，在第五密封槽1411内设置第五密封件(图未示)，使胶装端盖141与油中绝缘管160之间密封固定。
同时，安装端盖142的上端部与胶装端盖141的下端部形状匹配且密封连接，具体地，在安装端盖142与胶装端盖141接触的端面设有第六密封槽1421，安装端盖142封盖胶装端盖141的同时，在第六密封槽1421内设置第六密封件(图未示)，使安装端盖142与胶装端盖141之间密封固定。
继续参阅图12，安装端盖142的中心设有安装通孔1422，卷绕管121靠近尾部组件140的端部穿设安装通孔1422，与安装端盖142固定连接。具体地，安装通孔1422靠近胶装端盖141的内壁设置内螺纹，卷绕管121靠近尾部组件140的端部外周设置外螺纹，卷绕管121与安装通孔1422螺纹连接，且安装通孔1422远离胶装端盖141的一侧内壁设置第七密封槽1423，在第七密封槽1423内设置第七密封件(图未示)，使卷绕管121与安装端盖142之间密封固定，即保证卷绕管121靠近尾部组件140的部分也能够密封固定，防止外部水汽从变压器套管10的尾部进入变压器套 管10内。
需要说明的是，第五密封件、第六密封件、第七密封件与第一密封件的材质、粘接方式一致，且第七密封槽1423可以设置为一个，也可以设置为多个，不再赘述。
继续参阅图1和图11，尾部组件140还包括接线端子143，结合图6所示，第二导杆124靠近尾部组件140的一端内壁设置第二连接槽1243，接线端子143与第二连接槽1243连接，使接线端子143与第二导杆124固定连接。同时，第二导杆124与接线端子143连接的端部还设有并紧螺母144，并紧螺母144套接于接线端子143外且抵接第二导杆124靠近尾部组件140的端部，使第二导杆124与接线端子143之间锁紧，同时可以任意调节接线端子143的角度。
具体地，结合图1、图11和图13所示，接线端子143包括第二连接部1431、挡板1432和安装板1433，第二连接部1431呈圆柱体，挡板1432和安装板1433均为薄板，第二连接部1431的一端与挡板1432的一侧面连接，安装板1433的一端与挡板1432的另一侧面连接，且安装板1433上设有接线孔(图未示)，用于连接变压器绕组引线。在一实施场景中，第二连接部1431、挡板1432和安装板1433一体成型，当然也可以通过焊接等其他形式相互连接固定。
进一步地，第二连接部1431的外周面设置外螺纹，第二连接槽1243的内壁设置内螺纹，如此，接线端子143与第二导杆124通过螺纹连接，螺纹连接使接线端子143与第二导杆124的连接更可靠，安装更方便。在安装接线端子143时，先将并紧螺母144安装到接线端子143上，即将并紧螺母144旋转到第二连接部1431靠近挡板1432的一端，然后将并紧螺母144与接线端子143的整体旋转到第二连接槽1243内，调整接线端子143的安装角度，并拧紧并紧螺母144，使并紧螺母144贴合在第二导杆124的端部且抵接第二导杆124的端面，从而保证接线端子143与第二导杆124之间的螺纹锁紧。当需要调整接线端子143的安装角度时，只需要旋转拧松并紧螺母144进行调整即可。
在一实施场景中，第二连接部1431与挡板1432连接的一端还开设有 第四凹槽，使第二连接部1431与挡板1432之间形成有间隙1435，同时，接线端子143的外周面上还设有通油槽1436，通油槽1436沿着第二连接部1431的轴向开设，也即沿载流杆122的轴向开设，通油槽1436可以设置一个，也可以均布多个。由于试验中的变压器套管10垂直设置(按图中的方向)，变压器油可沿通油槽1436从间隙1435流出，从而使变压器套管10在试验时载流杆122内残存的变压器油放尽，便于二次包装和运输。
在另一实施场景中，安装端盖142的外周面上还设有第三销孔1424，第三销孔1424的轴线与变压器套管10的轴线相互垂直，卷绕管121上与第三销孔1424内对应的侧面还设有第四销孔(图未示)，第三销孔1424与第四销孔对齐后同时穿设销钉，将卷绕管121与安装端盖142固定，可防止卷绕管121在变压器套管10运行过程中发生偏转。
本实施方式提供的变压器套管10包括载流杆122和卷绕管121，卷绕管121套设在载流杆122外，且卷绕管121与载流杆122之间留有空隙，载流杆122用于载流，卷绕管121用于卷制电容芯子150。如此，卷绕管121的直径可设置为较大，一方面，便于电容芯子150的卷制；另一方面，同等电压等级、不同电流等级的变压器套管10，其外形尺寸一致、载流杆122尺寸不一致，因此可设计相同尺寸的卷绕管121、储油柜111和复合外套130等，仅需根据不同电流设置不同尺寸的载流杆122，即可实现不同电流等级产品的互换。同时，卷绕管121和载流杆122分别与变压器套管10的头部组件110和尾部组件140密封固定连接，保证卷绕管121和载流杆122的连接可靠，从而保证变压器套管10的整体可靠性。
本发明的技术内容及技术特点已揭示如上，然而可以理解，在本发明的创作思想下，本领域的技术人员可以对上述结构和材料作各种变化和改进，包括这里单独披露或要求保护的技术特征的组合，明显地包括这些特征的其它组合。这些变形和/或组合均落入本发明所涉及的技术领域内，并落入本发明权利要求的保护范围。

Claims (15)

  1. 一种变压器套管，包括头部组件、中心导管、复合外套和尾部组件，所述中心导管依次穿设所述头部组件、所述复合外套和所述尾部组件，其特征在于，所述中心导管包括：
    载流杆，所述载流杆包括第一导杆和第二导杆，所述第一导杆和所述第二导杆固定连接；
    卷绕管，所述卷绕管套设在所述载流杆外，所述卷绕管与所述载流杆之间的间隙不小于1.5mm，所述卷绕管的长度小于所述载流杆的长度。
  2. 如权利要求1所述的变压器套管，其特征在于，所述第一导杆为实心金属圆杆，所述第一导杆包括本体和第一连接部，所述本体的外径大于所述第一连接部的外径。
  3. 如权利要求2所述的变压器套管，其特征在于，所述第二导杆为空心金属管，所述第二导杆远离所述尾部组件的一端内壁设置第一连接槽，所述第一连接部与所述第一连接槽固定连接。
  4. 如权利要求1所述的变压器套管，其特征在于，所述头部组件包括储油柜和压紧装置，所述压紧装置位于所述储油柜内，所述卷绕管远离所述尾部组件的一端位于所述储油柜内且通过所述压紧装置固定。
  5. 如权利要求4所述的变压器套管，其特征在于，所述压紧装置包括压紧螺母、上压板、压板弹簧和下压板，所述下压板抵接所述储油柜内部的下端，所述卷绕管依次穿设所述压紧螺母、所述上压板、所述压板弹簧和所述下压板后通过紧固件固定。
  6. 如权利要求4所述的变压器套管，其特征在于，所述储油柜包括储油柜盖板和柜体，所述储油柜盖板封盖所述柜体，所述卷绕管的所述一端与所述储油柜盖板密封连接。
  7. 如权利要求6所述的变压器套管，其特征在于，所述储油柜盖板沿所述储油柜的轴线向外侧延伸有凸台，所述载流杆伸出所述卷绕管的所述一端后通过固定装置固定在所述储油柜外，所述固定装置包括哈夫环、压 筒和压盖，所述哈夫环套接于所述载流杆外并抵接所述凸台，所述压筒罩设所述哈夫环并抵接所述储油柜盖板，所述压盖封盖所述压筒，使所述载流杆固定。
  8. 如权利要求3所述的变压器套管，其特征在于，所述变压器套管还包括油中绝缘管，所述油中绝缘管的一端与所述复合外套的端部连接，所述尾部组件包括胶装端盖和安装端盖，所述胶装端盖与所述油中绝缘管的另一端连接，所述安装端盖的上端部与所述胶装端盖的下端部形状匹配且密封连接，所述安装端盖设置安装通孔，所述卷绕管靠近所述尾部组件的一端与所述安装通孔固定连接。
  9. 如权利要求8所述的变压器套管，其特征在于，所述尾部组件还包括接线端子，所述第二导杆靠近所述尾部组件的一端内壁设置第二连接槽，所述接线端子与所述第二连接槽固定连接。
  10. 如权利要求9所述的变压器套管，其特征在于，所述第二导杆与所述接线端子连接的端部还设有并紧螺母，且所述并紧螺母套接于所述接线端子外。
  11. 如权利要求9所述的变压器套管，其特征在于，所述接线端子的外周面上设有通油槽，所述通油槽沿所述载流杆的轴向开设。
  12. 如权利要求1所述的变压器套管，其特征在于，所述第二导杆上设有通油孔，所述通油孔的轴线与所述第二导杆的轴线相互垂直。
  13. 如权利要求1所述的变压器套管，其特征在于，所述载流杆的外壁上设置第一凹槽，所述第一凹槽中卡设导向环，所述导向环的外环面凸出所述载流杆的外壁且抵靠所述卷绕管的内壁。
  14. 如权利要求13所述的变压器套管，其特征在于，所述导向环由两个弧形卡箍包围组成环状件。
  15. 如权利要求13所述的变压器套管，其特征在于，所述导向环的外径比所述卷绕管的内径小1mm。
PCT/CN2022/074656 2021-02-08 2022-01-28 一种变压器套管 WO2022166821A1 (zh)

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