WO2009105931A1 - 一种分接开关用的动触头 - Google Patents

一种分接开关用的动触头 Download PDF

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Publication number
WO2009105931A1
WO2009105931A1 PCT/CN2008/001752 CN2008001752W WO2009105931A1 WO 2009105931 A1 WO2009105931 A1 WO 2009105931A1 CN 2008001752 W CN2008001752 W CN 2008001752W WO 2009105931 A1 WO2009105931 A1 WO 2009105931A1
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WO
WIPO (PCT)
Prior art keywords
movable contact
assembly
contact
leaf spring
tap changer
Prior art date
Application number
PCT/CN2008/001752
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English (en)
French (fr)
Inventor
肖日明
Original Assignee
上海华明电力设备制造有限公司
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Application filed by 上海华明电力设备制造有限公司 filed Critical 上海华明电力设备制造有限公司
Publication of WO2009105931A1 publication Critical patent/WO2009105931A1/zh

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/0005—Tap change devices
    • H01H9/0016—Contact arrangements for tap changers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/12—Contacts characterised by the manner in which co-operating contacts engage
    • H01H1/36—Contacts characterised by the manner in which co-operating contacts engage by sliding
    • H01H1/42—Knife-and-clip contacts
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/50—Means for increasing contact pressure, preventing vibration of contacts, holding contacts together after engagement, or biasing contacts to the open position

Definitions

  • the invention relates to the field of transformer tap changer, and in particular to a movable contact for transformer tapping. Background technique:
  • the power grid is developing towards high voltage and high current.
  • the voltage requirements of the transformer are getting higher and higher, and the current demand is getting bigger and bigger.
  • two contacts or even more contacts can be provided at one contact end. Due to the relationship between the external force and the internal stress during manufacturing, the contact on the moving contact with more contacts is not able to completely contact the static contact, so that the contact resistance is large and the contact is not increased. It also causes heat and also shortens the life of the contacts.
  • the M-type switch 1 is commonly used, and two contacts 11 and 12 are provided at the front end of the contact.
  • the moving contact used in the current increasing method is like the existing two-contact clamping movable contact 2, as shown in FIG. 2, the upper and lower contacts 21 of the double-contact clamping movable contact 2, 22 is clamped and pressed by a cylindrical coil spring 27.
  • two contacts 23, 24, 25, 26 are disposed at both ends of the upper and lower contacts 21, 22, so that each end of the movable contact 2 corresponds to the upper and lower sides. 4 contacts, but the maximum current of the tap changer can only reach 600A.
  • the present invention is a moving contact for a transformer tap changer which is proposed to overcome the above-mentioned deficiencies of the prior art.
  • the technical problem solved by the present invention is achieved by the following technical solutions:
  • the movable contact for the transformer tap changer includes a movable contact mounting plate assembly that rotates with the switch main shaft and is disposed on the movable contact mounting plate assembly
  • the clamping movable contact', the clamping movable contact is divided into two upper and lower moving contact parts that are connected to each other and sandwiched, and each set of moving contact parts comprises a moving contact assembly and is disposed at a leaf spring assembly on the moving contact assembly, the leaf spring assembly applies a pressing force to the moving contact assembly;
  • the moving contact assembly is composed of a plurality of single moving contacts juxtaposed, each single moving contact There is one contact at each end of the head.
  • the movable contact member further includes a seat, and the movable contact assembly and the leaf spring assembly are located in the support.
  • a first mounting hole for mounting the leaf spring assembly is disposed on one surface of the support, and a second mounting hole corresponding to the first mounting hole is also disposed on the leaf spring assembly,
  • the leaf spring assembly is secured to the inner surface of the seat by fasteners that pass through the first and second mounting holes.
  • the movable contact assembly is mounted on the support by a round pin extending transversely through the entire movable contact assembly, and the movable contact assembly is swingable around the round pin by a certain amplitude.
  • the claws are disposed at both ends of the leaf spring assembly, the number of the claws and the single movement The number of contacts is equal.
  • the claws of each of the claws of the leaf spring assembly are sleeved. There is an insulating sleeve.
  • the moving contact mounting plate assembly comprises a moving contact rotating bracket mounted on the switch main shaft and rotating with the switching main shaft, and a U-shaped support fixed at one end of the rotating contact holder of the movable contact, the clamping type dynamic touch
  • the head is mounted on the U-shaped mount by a transverse pin.
  • the leaf spring assembly is formed by stacking a plurality of leaf springs, and the length of the leaf springs is sequentially decreased from bottom to top. At each end of the spring, there are provided claws, and the number of claws of the claws at both ends of each spring is the same.
  • the present invention divides the movable contact assembly into a plurality of single movable contacts, and at the same time, each of the individual movable contacts is pressed by each claw of the claws at both ends of the leaf spring assembly. Therefore, it is ensured that the contacts on each of the single moving contacts can form a good contact with the contact ring and the static contact, which increases the conduction capability of the tap changer.
  • the leaf spring assembly used in the invention occupies a small space, and the movable contact member has a compact structure, thereby also making the tap changer design more compact and reasonable.
  • the present invention can meet the different electrical conductivity requirements of the tap changer by varying the number of individual moving contacts in the moving contact set.
  • Figure 1 is a schematic view showing the structure of a double-contact moving contact in an M-type switch in the prior art
  • FIG. 2 is a schematic structural view of a prior art double-contact clamping type movable contact
  • FIG. 3 is a schematic structural view of a movable contact assembly according to the present invention.
  • FIG. 4 is a schematic structural view of a leaf spring assembly according to the present invention.
  • Figure 5 is a schematic view showing the assembly structure of the clamp type movable contact according to the present invention.
  • FIG. 6 is a schematic view showing the application of the movable contact for the tap changer in the transformer tap changer according to the present invention. detailed description The invention will be further elucidated below in conjunction with the specific drawings and specific embodiments.
  • the movable contact for the transformer tapping of the present embodiment includes a moving contact mounting plate assembly 200 that rotates with the spindle 100 and a clamping motion provided on the moving contact mounting plate assembly 200.
  • Contact 300 The movable contact mounting plate assembly 200 includes a movable contact rotating bracket 210 and a U-shaped bracket 220.
  • One end of the movable contact rotating bracket 210 is fixed on the switch main shaft 100, so that the movable contact rotating bracket 210 rotates with the switching spindle 100.
  • the U-shaped bracket 220 is fixed to the other end of the movable contact rotating bracket 210, so that the U-shaped bracket 220 rotates with the switch spindle 100 under the driving of the movable contact rotating bracket 210.
  • the clamped movable contact 300 is mounted on the U-shaped bracket 220 via the transverse pin 221 such that the clamped movable contact 300 also rotates with the switch spindle 100.
  • the clamping movable contact 300 is divided into upper and lower two sets of movable contact members that are connected to each other and sandwiched, and each set of movable contact members includes a support 310, a movable contact assembly 320 and a leaf spring assembly 330.
  • the support 310 is a slot-shaped structure.
  • two first mounting holes 311 for mounting the leaf spring assembly 330 are disposed, and one side of each of the slot sides is provided with a movable contact.
  • the cylindrical pin bore 312 of the head assembly 320, wherein the cylindrical pin bore 312 in the abutment 310 of the lower set of moving contact members is also used to mount the transverse pin 221.
  • the movable contact assembly 320 is composed of four single movable contacts 321 in parallel.
  • Each of the single movable contacts 321 is in the form of a long strip, and a long hole 322 extending transversely through the single movable contact 321 is disposed in the middle. There is one contact at each end.
  • the four single movable contacts 321 can be combined in a parallel arrangement by a round pin 323 passing through the long holes 322 of the four single movable contacts 321, and then the two ends of the round pin 323 can be folded.
  • the entire movable contact set 320 can be mounted in the support 310.
  • the mounting manner can be such that the entire movable contact assembly 320 is wound around the round pin 323.
  • the upper and lower sets of moving contact assemblies 320 functionally form a clip by mating with the leaf spring assembly 330.
  • each of the movable contact assemblies 320 uses four single movable contacts 321 , but the movable contact assembly 320 of the present invention is not limited to four single movable contacts 321 , and may also be different according to the tap changer. Conductive requirements to increase or decrease the number of individual moving contacts 321 .
  • the leaf spring assembly 330 is formed by stacking three leaf springs 331.
  • the length of the three leaf springs 331 is sequentially decreased from bottom to top, that is, the bottommost piece spring 331 is the longest, and the middle piece spring 331 Slightly shorter, the top piece of spring 331 is the shortest.
  • Two second mounting holes 332 are formed in the middle of each of the leaf springs 331, and the two second mounting holes 332 correspond to the two first mounting holes 311 on the groove bottom surface of the holder 310.
  • each of the leaf springs 331 is provided with four claws 333 at both ends thereof, and the claws of the four claws 333 are used to abut and press down the single movable contact 321 with respect thereto.
  • the claw 333 of the bottom piece of spring 331 is sleeved with an insulating sleeve 334, and the insulating sleeve 334 functions as the insulation and magnetic insulation of the claw 333 to avoid burning the leaf spring 331.
  • the number of the leaf springs 331 in the leaf spring assembly 330 of the present embodiment is not limited to three pieces per week, and may be required according to Increase in elasticity.
  • the leaf spring assembly 330 is mounted by: using two fasteners, such as bolts, through the second mounting holes 332 on the three leaf springs 331 and the bottom surface of the support 310.
  • the first mounting hole 311 can fasten the three leaf springs 331 on the inner wall of the groove bottom of the support 310 in a superimposed manner, and the claws of the claw 333 abut and press down the single movable contact 321 corresponding thereto,
  • the two sets of moving contact assemblies 320 are clamped in the middle such that the two sets of moving contact assemblies 320 are functionally similar to the clips, clamping the contact ring 500 and the stationary contact 600 (see Figure 6).
  • the clamping movable contact 300 is mounted on the moving contact rotating bracket 210 through the U-shaped bracket 220.
  • One end of the two movable contact assemblies 320 clamps the contact ring 500, and the other end holds the static contact. 600, deforming the leaf spring 331 in the leaf spring assembly 330, and the reaction force of the leaf spring 331 causes each single moving contact 321 in the movable contact group 320 to press the set ring 500 and the static contact 600 according to the set pressure.
  • Contact to achieve the purpose of conducting a large current.
  • the movable contact for the tap changer of the present invention has the following outstanding advantages:
  • the contact conductivity can be improved, and the embodiment can carry the working current 1000A, the short-circuit current 20000A, and the peak value 50KA.
  • the compacted leaf spring assembly takes up less space and makes the moving contact assembly compact, which also makes the tap changer design more compact and reasonable.
  • the invention can meet the different electrical conductivity requirements of the tapping and closing by changing the number of single moving contacts in the moving contact group.

Landscapes

  • Push-Button Switches (AREA)
  • Rotary Switch, Piano Key Switch, And Lever Switch (AREA)
  • Contacts (AREA)

Description

一种分接开关用的动触头 技术领域：
本发明涉及变压器分接开关领域， 具体来说涉及一种变压器分接幵关用的动触头。 背景技术：
. 现在电网向高电压、 大电流方向发展， 其对变压器电压要求越来越高， 电流要求越来 越大， 这就要求与其配套的分接开关也需具有承接高电压大电流的能力。
在现有技术中， 为了增加触头通电流的能力， 可在一个触头端设置 2个触点甚至再多 的触点。 由于外力和制造时的内部应力的关系， 往往会使得具有更多触点的动触头上的触 点不能与静触头完全接触， 使得接触电阻很大， 起不到增加触点的作用， 并引起发热， 同 时也造成触点的寿命缩短。 如现在普遍使用的 M型开关 1 , 如图 Γ所示， 其触头前端即设 有 2个触点 11和 12。
另一增加电流的方法即用弹簧来增加触头的接触压力， 但这种压力增加是有限度的， 因为压力增加到一定程度后对增加电流作用减小； 另一方面， 过大的压力也会对触头之间 的切换不利。这类增加电流方法所使用的动触头有如现有双触点夹持式动触头 2，如图 2所 示， 该双触点夹持式动触头 2的上、 下触头 21、 22呈夹持状， 采用圆柱螺旋弹簧 27压紧。 为增加上、 下触头 21、 22导电能力， 在上、 下触头 21、 22两端均设置两个触点 23、 24、 25、 26， 使动触头 2的每端上下对应既有 4个触点， 但这样分接开关最大电流也只能达到 600A。 发明内容：
本发明就是为了克服上述现有技术之不足而提出的一种变压器分接开关用的动触头。 本发明所解决的技术问题通过以下技术方案来实现： 该变压器分接开关用的动触头， 包 括随开关主轴旋转的动触头安装板组件和设置在所述的动触头安装板组件上的夹持式动触 头'， 所述的夹持式动触头分为相互连接并成夹持状的上下两组动触头部件， 每组动触头部 件包括动触头组件和设置在动触头组件上的片弹簧组件， 所述片弹簧组件对所述的动触头 组件施加压紧力； 所述的动触头组件由多个单个动触头并列组成， 每一个单个动触头两端 各有一个触点。
所述的动触头部件还包括一支座， 所述的动触头组件和片弹簧组件位于所述支座内， 在所述支座的一个表面上设置有用于安装片弹簧组件的第一安装孔， 在所述的片弹簧组件 上也设置有与所述的第一安装孔相对应的第二安装孔， 所述的片弹簧组件通过穿过'第一安 装孔和第二安装孔的紧固件固定在所述的支座内表面上。 ·
. 所述的动触头组件通过一横向贯穿整个动触头组件的圆销安装在所述支座上， 所述的 动触头组件可绕所述的圆销做一定幅度的摆动。
为了使片弹簧组件分别实施对单个动触头的抵住并下压单个动触头， 在所述的片弹簧 组件的两端设置有片爪， 所述片爪的数量与所述的单个动触头数量相等。 为了保证压紧片 弹黉组件与动触头组件之间绝缘以及起到隔磁隔热的作用， 避免烧坏片弹簧组件， 在所述 的片弹簧组件的片爪的每一爪头上套有绝缘套。
所述的动触头安装板组件包括一安装在开关主轴上并随开关主轴旋转的动触头旋转支 架以及固定在动触头旋转支架一端的 U形支座， 所述的夹持式动触头通过横向销轴安装在 所述的 U形支座上。
所述的片弹簧组件由多个片弹簧叠加而成， 且所述片弹簧的长度由底向上依次减小。 在每一片弹簧两端设置有片爪， 每一片弹簧两端的片爪的爪数相同。
由于釆用了如上的技术方案， 本发明将动触头组件分为若干个单个动触头， 同时采用 片弹簧组件两端的片爪的每一爪头对每一个单个动触头实施压紧， 从而保证了每一个单个 动触头上的触点均能与接触环和静触头形成良好的接触导通，增加了分接开关的导通能力。 本发明釆用的片弹簧组件占用空间小， 使动触头部件结构紧凑， 从而也可使分接开关设计 的更加紧凑合理。 本发明可以通过改变动触头组中的单个动触头数量， 来满足分接开关不 同的导电要求。 附图说明
" 图 1现有技术中 M型开关中双触点动触头结构示意图；
图 2为现有技术双触点夹持式动触头结构示意图；
图 3为本发明所述的动触头组件结构示意图；
图 4为本发明所述的片弹簧组件结构示意图；
图 5为本发明所述的夹持式动触头装配结构示意图；
图 6为本发明所述的分接开关用的动触头应用于变压器分接开关中的示意图。 具体实施方式 • 下面结合具体附图和具体实施方式， 进一步阐述本发明。
参见图 6，本实施例的变压器分接幵关用的动触头，包括随幵关主轴 100旋转的动触头 安装板组件 200和设置在动触头安装板组件 200上的夹持式动触头 300。动触头安装板组件 200包括一动触头旋转支架 210和 U形支座 220，动触头旋转支架 210的一端固定在开关主 轴 100上， 使动触头旋转支架 210随开关主轴 100旋转。 U形支座 220固定在动触头旋转 支架 210的另一端，使 U形支座 220在动触头旋转支架 210的带动下随开关主轴 100旋转。 夹持式动触头 300通过横向销轴 221安装在 U形支座 220上， 这样夹持式动触头 300也会 随开关主轴 100旋转。
参见图 5， 夹持式动触头 300分为相互连接并成夹持状的上下两组动触头部件， 每组动 触头部件包括支座 310、 动触头组件 320和片弹簧组件 330， 支座 310为一槽形结构， 在支 座 310的槽底表面上设置有两个用于安装片弹簧组件 330的第一安装孔 311，两侧槽边各设 置有一个用以安装动触头组件 320的圆柱销孔 312，其中下组动触头部件中的支座 310上的 圆柱销孔 312还用于安装横向销轴 221。再参见图 3，动触头组件 320由四个单个动触头 321 并列组成， 每一个单个动触头 321为长条片状， 中间设置有横向贯穿单个动触头 321的长 孔 322，两端各有一个触点。参见图 5，用一圆销 323穿过四个单个动触头 321上的长孔 322, 就可以将这四个单个动触头 321以并行排列方式组合起来， 然后将圆销 323的两端穿入到 支座 310两侧槽边上的圆柱销孔 312中， 就可以将整个动触头组 320安装在支座 310中， 这样的安装方式可以使整个动触头组件 320绕圆销 323做一定幅度的摆动， 通过与片弹簧 组件 330配合， 上下两组动触头组件 320在功能上形成一个夹子。
'本实施例每组动触头组件 320釆用四个单个动触头 321， 但本发明的动触头组件 320并 不局限于四个单个动触头 321， 还可以根据分接开关不同的导电要求， 来增减单个动触头 321的数量。
参见图 4，片弹簧组件 330由三片片弹簧 331叠加而成，三片片弹簧 331的长度由底向 上依次减小， 即最底下的那片片弹簧 331最长， 中间那片片弹簧 331稍短， 最上面那片片 弹簧 331最短。 每一片片弹簧 331 的中间都开有两个第二安装孔 332， 这两个第二安装孔 332与支座 310的槽底表面上的两个第〜安装孔 311相对应。与四个单个动触头 321相对应, 每一片片弹簧 331的两端设置有四个片爪 333，四个片爪 333的爪头用于抵住并下压与其对 于的单个动触头 321。 最下面那一片片弹簧 331的片爪 333上套有绝缘套 334， 绝缘套 334 起到片爪 333的绝缘和隔磁隔热的作用， 可避免烧坏片弹簧 331。
本实施例的片弹簧组件 330中片弹簧 331的数量并不周限于三片， 可以根据所需要的 弹力而增加。
参见图 5和图 6， 上述片弹簧组件 330的安装方法是： 用两个紧固件， 如螺栓穿过三片 片弹簧 331上的第二安装孔 332和支座 310的槽底表面上的第一安装孔 311就可以将三片 片弹簧 331以叠加方式紧固在支座 310的槽底内壁上， 片爪 333的爪头抵住并下压与之对 应的单个动触头 321，将两组动触头组件 320往中间夹紧，使得两组动触头组件 320在功能 上类似于夹子， 将接触环 500和静触头 600夹紧（参见图 6)。
• 参见图 6， 夹持式动触头 300通过 U形支座 220安装在动触头旋转支架 210上， 两组 动触头组件 320的一端夹持接触环 500， 另一端夹持静触头 600， 使片弹簧组件 330中的片 弹簧 331变形， 而片弹簧 331的反作用力使动触头组 320中的每一单个动触头 321按设定 的压力与接触环 500和静触头 600接触， 以达到导通大电流的目的。
本发明一种分接开关用的动触头具有以下突出优点： 可提高触头导电能力， 本实施例 可承载工作电流 1000A,短路电流 20000A、峰值 50KA。采用的压紧片弹簧组件占用空间小， 使动触头组件结构紧凑， 从而也可使分接开关设计的更加紧凑合理。 本发明可以通过改变 动触头组中的单个动触头数量， 来满足分接幵关不同的导电要求。

Claims

权 利 要 求
1. 一种分接开关用的动触头， 包括随开关主轴 （100)旋转的动触头安装板组件 （200) 和设置在所述的动触头安装板组件（200)上的夹持式动触头 （300)， 其特征在于： 所述的 夹持式动触头（300)分为相互连接并成夹持状的上下两组动触头部件， 每组动触头部件包 括 ^触头组件（320)和设置在动触头组件 (320)上的片弹簧组件 （330)， 所述片弹簧组 件（330)对所述昀动触头组件（320)施加压紧力； 所述的动触头组件（320) 由多个单个 动触头 （321 ) 并列组成， 每一个单个动触头 （321 )两端各有一个触点。
2.根据权利要求 1所述的分接开关用的动触头， 其特征在于， 所述的动触头部件还包 括一支座（310)， 所述的动触头组件（320)和片弹簧组件（330)位于所述支座（310) 内。
3.根据权利要求 2所述的分接幵关用的动触头， 其特征在于， 在所述支座（310)的一 个表面上设置有用于安装片弹簧组件（330)的第一安装孔（311 ),在所述的片弹簧组件（330) 也设置有所述的第一安装孔 (311 )相对应的第二安装孔 (332), 所述的片弹簧组件（330) 通过穿过第一安装孔（311 )和第二安装孔 （332) 的紧固件固定在所述的支座（310) 内表 面上。
4.根据权利要求 2所述的分接幵关用的动触头，其特征在于，所述的动触头组件（320) 通过一横向贯穿整个动触头组件（320) 的圆销 （323 )安装在所述支座（310)上， 所述的 动触头组件（320)可绕所述的圆销 （323 ) 做一定幅度的摆动。
5. 根据权利要求 1 所述的分接开关用的动触头， 其特征在于， 在所述的片弹簧组件 (330) 的两端设置有片爪（333 )， 所述片爪（333 ) 的数量与所述的单个动触头（321 )数 量相等。
6. 根据权利要求 5 所述的分接开关用的动触头， 其特征在于， 在所述的片弹簧组件 (330) 的片爪 （333 ) 的每一爪头上套有绝缘套（334)。
7.根据权利要求 1所述的分接开关用的动触头， 其特征在于， 所述的动触头安装板组 件（200)包括一安装在幵关主轴（ 100)上并随开关主轴（100)旋转的动触头旋转支架（210) 以及固定在动触头旋转支架（210) —端的 U形支座（220), 所述的夹持式动触头 （300) 通过横向销轴 （221 ) 安装在所述的 U形支座（220) 上。 ，
8. 根据权利要求 1所述的分接开关用的动触头，其特征在于，所述的片弹簧组件（330) 由多个片弹簧（331 ) 叠加而成， 且所述片弹簧 （331 ) 的长度由底向上依次减小。
9.根据权利要求 1所述的分接开关用的动触头， 其特征在于， 在每一片弹簧（331 )两 端设置有片爪 （333 )， 每一片弹簧（331 )两端的片爪 （333 ) 的爪数相同。
PCT/CN2008/001752 2008-02-26 2008-10-17 一种分接开关用的动触头 WO2009105931A1 (zh)

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