WO2014190906A1 - 一种高压直流接地开关及其静触头组件 - Google Patents

一种高压直流接地开关及其静触头组件 Download PDF

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Publication number
WO2014190906A1
WO2014190906A1 PCT/CN2014/078657 CN2014078657W WO2014190906A1 WO 2014190906 A1 WO2014190906 A1 WO 2014190906A1 CN 2014078657 W CN2014078657 W CN 2014078657W WO 2014190906 A1 WO2014190906 A1 WO 2014190906A1
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Prior art keywords
static contact
grounding
voltage
grounding switch
contact
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PCT/CN2014/078657
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English (en)
French (fr)
Inventor
王占杰
孙玉洲
马永旭
胡延涛
夏立国
Original Assignee
国家电网公司
河南平高电气股份有限公司
平高集团有限公司
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Application filed by 国家电网公司, 河南平高电气股份有限公司, 平高集团有限公司 filed Critical 国家电网公司
Publication of WO2014190906A1 publication Critical patent/WO2014190906A1/zh

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H31/00—Air-break switches for high tension without arc-extinguishing or arc-preventing means
    • H01H31/26—Air-break switches for high tension without arc-extinguishing or arc-preventing means with movable contact that remains electrically connected to one line in open position of switch
    • H01H31/28—Air-break switches for high tension without arc-extinguishing or arc-preventing means with movable contact that remains electrically connected to one line in open position of switch with angularly-movable contact
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H31/00—Air-break switches for high tension without arc-extinguishing or arc-preventing means
    • H01H31/003—Earthing switches

Definitions

  • the invention relates to a high voltage DC earthing switch and a static contact assembly thereof.
  • HVDC transmission has the characteristics of long transmission distance, large transmission capacity, small line loss, easy control and regulation. It has been widely used in power systems, promoting large-scale development of long-distance transmission projects and promoting power resources. The shift from the traditional local balance to the overall balance will play a major role. At the same time, the demand for DC earthing switches used in HVDC projects has increased dramatically.
  • the traditional DC grounding switch is mainly divided into two types, one is a single-arm straight type, and the other is a single-arm folding type.
  • the disadvantage of the single-arm straight type is: in the process of opening and closing the grounding knife To ensure that the grounding knives have sufficient swinging space, occupy a large area of the power station, increase the construction cost of the power station, and the one-arm folding insert type solves the above problems well.
  • Chinese patent CN201048104Y discloses a l lOOkv UHV grounding switch, which is a single-arm folding plug-in type, mainly including a base, a post insulator, a moving contact, a static contact, a grounding knife and an operating mechanism, and a post insulator.
  • Fixed on the base the static contact is mounted on the ground support plate fixed on the upper end of the post insulator, and the static contact comprises a cylindrical guide cover fixed on the lower plate surface of the ground support plate, and the ground cover is arranged in the guide cover
  • the plate is electrically connected to the plum touch finger.
  • the grounding knives mainly comprise upper and lower conductive tubes, the lower end of the lower conductive tube is hinged on the base, the upper end is fixed with a gear box, and the lower end of the upper conductive tube is fixed on the gear shaft of the gear box, the moving contact Fixed on the upper end of the upper conductive tube; the adjustable rod is guided in the lower conductive tube and guided along the axial direction thereof, the lower end of the adjustable rod is hinged on the base, and the upper end has a rack that meshes with the gear in the gear box
  • the hinge shaft of the adjustable rod is lower than the hinge shaft of the lower conductive tube. The entire grounding knife is driven and connected with the operating mechanism through the transmission mechanism.
  • the grounding knife Under the driving of the operating mechanism, the grounding knife can swing up and down, wherein the upper swing is a joint movement and the hem is a split motion. Since the hinge axis of the adjustable pull rod is lower than the hinge axis of the lower conductive tube, axial relative movement between the adjustable pull rod and the lower conductive tube occurs during the opening and closing movement, so that the rack drive gear on the adjustable pull rod rotates , further driving the upper conductive tube to fold in the lower conductive tube; at the opening position, the lower conductive tube and the upper conductive tube are completely folded together and in a horizontal position, and the adjustable pull rod drives the upper conductive through the rack and pinion when the motion is combined The tube is gradually straightened.
  • the grounding switch is a single-arm folding plug-in type, because the grounding knife can be folded, effectively reducing the footprint of the grounding switch, but the grounding switch uses the strut insulator to support the static contact, and the cost of the post insulator is high. Undoubtedly, the overall cost of the grounding switch is increased. Especially for the DC earthing switch, the creepage distance of the DC insulator is much higher than that of the AC insulator (the electrostatic vacuum effect of the DC transmission), and the DC insulator is relatively more difficult to manufacture.
  • the object of the present invention is to provide a static contact assembly for a high-voltage DC grounding switch, which solves the problem of high difficulty and high cost of the existing grounding switch; and the present invention also provides a high voltage using the static contact assembly. DC grounding switch.
  • a high-voltage DC grounding switch includes a base and dynamic and static contacts, and a folding grounding knife capable of swinging up and down is hinged on the base, and the moving contact is fixed at a top end of the grounding knife, the static contact is located above the grounding knife and is inserted into the grounding knife to be engaged with the moving contact to achieve closing, the grounding switch further comprises The contact is fixed to the tube busbar clamp suspended on the pipe busbar. The top of the pipe busbar clamp is fixed with an upper equalizing ring, and the bottom is fixed with a lower equalizing ring. The static contact is located at the center of the upper and lower equalizing rings. on-line.
  • the tube bus bar clamp comprises a clamping body and an adjusting screw fixed on the lower end of the clamping body for the upper and lower guiding movement assembly of the static contact, and the adjusting thread on the screw is equipped with a locking nut for locking and positioning the static contact And a flexible wire is electrically connected between the clamping body and the static contact.
  • a transmission mechanism for driving connection with the operating mechanism is disposed between the base and the grounding knife, the transmission mechanism includes a support rod and a connecting rod which are sequentially hinged, and an end of the supporting rod is hinged on the base for driving connection with the operating mechanism , the end of the connecting rod is hinged on the grounding knife
  • the static contact assembly of the DC-DC grounding switch of the present invention adopts the following technical solution: a static contact assembly of a high-voltage DC grounding switch, including a static contact, and a tube for fixing the static contact to the busbar
  • the busbar clamp has an upper equalizing ring attached to the top of the pipe busbar clamp and a lower equalizing ring connected to the bottom, and the static contact is located on the center connecting line of the upper and lower equalizing rings.
  • the tube bus bar clamp comprises a clamping body and an adjusting screw fixed on the lower end of the clamping body for the upper and lower guiding movement assembly of the static contact, and the adjusting thread on the screw is equipped with a locking nut for locking and positioning the static contact And clamping the body
  • a flexible wire is electrically connected to the stationary contact.
  • the high-voltage DC grounding switch of the above structure since the static contact is directly fixed and suspended on the pipe busbar through the pipe busbar clamp, the post insulator for supporting the static contact can be omitted, the cost is reduced, and the insulator is avoided by the DC system.
  • the creepage distance requirement is high and the manufacturing difficulty of the insulator is increased; in addition, the static contact, the tube busbar clamp and the upper and lower equalizing rings are arranged in an integrated structure, and the structure is simple and the installation is convenient.
  • FIG. 1 is a schematic structural view of an embodiment of a high voltage DC earthing switch of the present invention
  • FIG. 2 is a schematic view showing the assembly of the static contact and the tube busbar clamp of FIG. 1;
  • Figure 3 is a schematic structural view of the static contact of Figure 2;
  • Figure 4 is a schematic structural view of the grounding guillotine of Figure 1;
  • Figure 5 is a schematic structural view of the transmission mechanism of Figure 1 in an open state
  • Fig. 6 is a schematic structural view of the transmission mechanism of Fig. 1 in a closed state.
  • the embodiment of the high-voltage DC grounding switch of the present invention is as shown in FIG. 1-6, and mainly comprises a base 8, a movable contact 12, a static contact 2, a grounding blade 7 and an operating mechanism 4, and an upper end of the stationary contact 2
  • the tube busbar clamp 6 is fixed, and the static contact 2 can be directly positioned and suspended on the pipe busbar 1 through the pipe busbar clamp 6, and a shielding system is further provided on the pipe busbar clamp 6, and the shielding system is composed of the upper pressure equalizing ring 5 and the lower
  • the equalizing ring 3 is formed, wherein the upper equalizing ring 5 is fixed on the top of the tube busbar clamp 6, the lower equalizing ring 3 is fixed on the bottom of the tube busbar clamp 6, the static contact 2, the tube busbar clamp 6, and the upper equalizing ring 5 and the lower equalizing ring 3 constitute a static contact assembly;
  • the static contact 2 comprises a cylindrical guiding cover 21, the lower end portion of which is flared downwardly, and the upper end opening of the
  • the grounding blade ⁇ mainly includes an upper conductive tube 73 and a lower conductive tube 75.
  • the lower end of the lower conductive tube 75 is hinged on the base 8, and a gear box is fixed at the upper end, and the lower end of the upper conductive tube 73 is fixed to the gear of the gear box.
  • the movable contact 12 is fixed on the upper end of the upper conductive tube 73; and an adjustable pull rod 72 is arranged in the lower conductive tube 75 for guiding movement along the axial direction thereof, and the lower end of the adjustable pull rod 72 is hinged on the base.
  • the upper end is fixed with a rack 71 that meshes with a gear 74 on a gear shaft of the gear box.
  • the hinge shaft of the adjustable rod 72 is lower than the hinge shaft of the lower conductive tube 75.
  • the entire grounding blade 7 is connected to the operating mechanism 4 through a transmission mechanism. Under the driving of the operating mechanism 4, the grounding blade can swing up and down, wherein the upper swing is the closing motion and the hem is the opening movement; Pull rod 72
  • the hinge shaft is lower than the hinge shaft of the lower conductive tube 75.
  • an axial relative movement between the adjustable rod 72 and the lower conductive tube 75 occurs, so that the rack 71 on the adjustable rod 72 drives the gear to rotate.
  • the upper conductive tube 73 and the lower conductive tube 75 are folded, wherein the grounding blade 7 is gradually straightened during the closing movement, and is completely extended at the closing position, and is electrically conductive when approaching the closing position.
  • the tube 73 moves approximately vertically upwards, thereby driving the movable contact 12 to be inserted into the guide cover 21 of the fixed contact 2 from the bottom up and to be electrically connected to the plum finger 23.
  • a downwardly extending adjusting screw 11 is fixed at the bottom of the clamping body of the tube bus bar clamp 6, and the static contact 2 is up and down
  • the guiding movement is fitted on the adjusting screw 11, and the locking positioning is achieved by adjusting the threaded screw of the screw 11 to be fitted.
  • the transmission mechanism comprises a support rod 9 and a connecting rod 10 which are hinged in sequence, the end of the support rod 9 is hinged on the base 8, and the end of the connecting rod 10 is hinged at the middle of the lower conductive tube 75, as shown in FIG.
  • the support rod 9 and the connecting rod 10 are recombined into a straight line and cooperate with the lower conductive tube 75 and the base 8 to form a triangular frame structure, so that the grounding knife 7 has high rigidity and stability. To ensure a more reliable combination.
  • the working principle of the above embodiment is as follows: At the opening position, the lower conductive tube 75 and the upper conductive tube 73 are completely folded together and in a horizontal position. When the movement is closed, the adjustable rod 72 drives the upper conductive tube 73 through the rack and pinion. Gradually straightening, at the end of the closing position, the upper conductive tube 73 is completely straightened, and the movable contact 12 is vertically inserted into the static contact 2 from the bottom to the top and electrically connected with the plum finger 23, and the closing is completed. At the closing position, the lower conductive tube 75 and the upper conductive tube 73 are both in a vertical position; the process of the opening movement is opposite to the process of the closing movement.
  • FIG. 1-4 The embodiment of the static contact assembly of the high-voltage DC grounding switch of the present invention is as shown in FIG. 1-4, which is consistent with the structure of the static contact assembly in the above embodiment, and the details thereof are not described herein again.

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  • Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
  • Arc-Extinguishing Devices That Are Switches (AREA)

Abstract

一种高压直流接地开关及其静触头组件，该接地开关包括底座（8）和动触头（12）、静触头（2），底座（8）上铰接有可上下摆动的折叠式接地闸刀（7），动触头（12）固设在接地闸刀（7）的顶端，静触头（2）位于接地闸刀（7）的上方并在接地闸刀（7）上摆伸直时与动触头（12）插接配合以实现合闸，该接地开关还包括用于将静触头（2）固定悬挂在管母线（1）上的管母线夹（6），管母线夹（6）的顶部固连有上均压环（5）、底部固连有下均压环（3），静触头（2）位于上、下均压环（5，3）的中心连线上。由于静触头（2）通过管母线夹（6）直接固定悬挂在管母线（1）上，就可以省去用于支撑静触头（2）的支柱绝缘子，降低了成本，并且避免因直流系统对绝缘子爬电距离要求高而增加绝缘子的制造难度。

Description

说明书 一种高压直流接地开关及其静触头组件 技术领域
本发明涉及一种高压直流接地开关及其静触头组件。
背景技术
直流输电具有输电距离远、 输电容量大、 线路损耗小、 易于控制和调节等特点， 目 前已在电力系统中得到了越来越广泛的应用， 对推动大规模发展远距离输电工程、 促进 电力资源由传统的就地平衡转变为统筹平衡将发挥重大作用， 与此同时， 直流输电工程 所使用的直流接地开关的需求也急剧增加。 传统的直流接地开关主要分为两种， 一种是 单臂直抡式， 另一种是单臂折叠插入式， 单臂直抡式的缺点是： 在接地闸刀分合闸动作 的过程中， 要确保接地闸刀有足够的摆动空间， 占用电站较大面积， 增加电站的建设费 用， 而单臂折叠插入式则很好的解决了上述问题。
如中国专利 CN201048104Y公开了一种 l lOOkv特高压接地开关，该接地开关为单臂 折叠插入式， 主要包括底座、 支柱绝缘子、 动触头、 静触头、 接地间刀和操动机构， 支 柱绝缘子固定在底座上， 静触头安装在支柱绝缘子上端固设的接地支板上， 静触头包括 上端与接地支板的下板面固连的筒状导向罩， 导向罩内设有与接地支板导电连接的梅花 触指。 所述接地闸刀主要包括上、 下导电管， 下导电管的下端铰接在底座上、 上端固设 有齿轮箱， 上导电管的下端固设在齿轮箱的齿轮轴上， 所述动触头固设在上导电管的上 端； 在下导电管内还插装有沿其轴向导向移动的可调拉杆， 可调拉杆的下端铰接在底座 上、 上端部具有与齿轮箱内的齿轮啮合的齿条， 可调拉杆的铰接轴低于下导电管的铰接 轴。 整个接地闸刀通过传动机构与操动机构传动连接， 在操动机构的驱动下， 接地闸刀 能够上下摆动， 其中上摆为合间运动， 下摆为分间运动。 由于可调拉杆的铰接轴低于下 导电管的铰接轴， 在分合闸运动过程中， 可调拉杆与下导电管之间发生轴向相对运动， 使得可调拉杆上的齿条驱动齿轮旋转， 进而带动上导电管在下导电管发生折叠动作； 在 分闸位置处， 下导电管和上导电管完全折叠在一起并处于水平位置， 合间运动时， 可调 拉杆通过齿轮齿条驱动上导电管逐渐伸直， 在合闸终了位置， 上导电管完全伸直， 并带 动动触头由下往上竖直插入到静触头内与梅花触指电连， 合间完成。 该接地开关即为单 臂折叠插入式， 由于接地闸刀能够发生折叠动作， 有效的减小了接地开关的占地面积， 但是该接地开关采用支柱绝缘子支撑静触头， 支柱绝缘子的成本高， 无疑增加了接地开 关的整体成本， 尤其是对于直流接地开关， 其直流绝缘子的爬电距离要比交流绝缘子高 很多 （直流输电的静电吸尘效应）， 直流绝缘子的制造难度相对更大。
发明内容
本发明的目的是提供一种高压直流接地开关的静触头组件，用以解决现有接地开关 制造难度大、 成本高的问题； 同时本发明还提供了一种使用该静触头组件的高压直流接 地开关。
本发明的压直流接地开关采用如下技术方案： 一种高压直流接地开关， 包括底座和 动、 静触头， 底座上铰接有可上下摆动的折叠式接地间刀， 所述动触头固设在接地闸刀 的顶端，所述静触头位于接地闸刀的上方并在接地闸刀上摆伸直时与动触头插接配合以 实现合闸， 该接地开关还包括用于将所述静触头固定悬挂在管母线上的管母线夹， 管母 线夹的顶部固连有上均压环、 底部固连有下均压环， 所述静触头位于上、 下均压环的中 心连线上。
所述管母线夹包括夹持本体以及固设在夹持本体下端的、供所述静触头上下导向移 动装配的调节螺杆， 调节螺杆上螺纹装配有对静触头锁紧定位的锁紧螺母， 且夹持本体 与静触头之间导电连接有软导线。
所述底座和接地闸刀之间设有用于与操动机构传动连接的传动机构，传动机构包括 依次铰接的支撑杆和连杆， 支撑杆的末端铰接在底座上用于与操动机构传动连接， 连杆 的末端铰接在接地间刀上
本发明的压直流接地开关的静触头组件采用如下技术方案：一种高压直流接地开关 的静触头组件， 包括静触头， 还包括用于将静触头固定悬挂在管母线上的管母线夹， 管 母线夹的顶部固连有上均压环、 底部固连有下均压环， 所述静触头位于上、 下均压环的 中心连线上。
所述管母线夹包括夹持本体以及固设在夹持本体下端的、供所述静触头上下导向移 动装配的调节螺杆， 调节螺杆上螺纹装配有对静触头锁紧定位的锁紧螺母， 且夹持本体 与静触头之间导电连接有软导线。
采用上述结构的高压直流接地开关， 由于静触头通过管母线夹直接固定悬挂在管母 线上， 就可以省去用于支撑静触头的支柱绝缘子， 降低了成本， 并且避免因直流系统对 绝缘子爬电距离要求高而增加绝缘子的制造难度； 另外， 静触头、 管母线夹和上、 下均 压环设置成一体结构， 结构简单、 安装方便。
附图说明
图 1为本发明的高压直流接地开关的一种实施例的结构示意图；
图 2为图 1中的静触头与管母线夹的装配示意图；
图 3为图 2中的静触头的结构示意图；
图 4为图 1中的接地闸刀的结构示意图；
图 5为图 1中的传动机构处于分闸状态时的结构简图；
图 6为图 1中的传动机构处于合闸状态时的结构简图。
具体实施方式
本发明的高压直流接地开关的实施例：如图 1-6所示，主要包括底座 8、动触头 12、 静触头 2、接地闸刀 7和操动机构 4， 静触头 2的上端固设有管母线夹 6， 通过管母线夹 6可以将静触头 2直接定位悬挂在管母线 1上， 在管母线夹 6上还设有屏蔽系统， 屏蔽 系统由上均压环 5和下均压环 3构成， 其中， 上均压环 5固定在管母线夹 6的顶部， 下 均压环 3固定在管母线夹 6的底部， 静触头 2、 管母线夹 6、 上均压环 5和下均压环 3 组成静触头组件； 静触头 2包括筒状导向罩 21， 其下端部为扩口朝下的喇叭状， 导向罩 21的上端开口处固定插装有触指座 22，触指座 22的伸入端固设有梅花触指 23。所述接 地闸刀 Ί主要包括上导电管 73和下导电管 75，下导电管 75的下端铰接在底座 8上、上 端固设有齿轮箱， 上导电管 73的下端固设在齿轮箱的齿轮轴上， 所述动触头 12固设在 上导电管 73的上端；在下导电管 75内还插装有沿其轴向导向移动的可调拉杆 72，可调 拉杆 72的下端铰接在底座上、上端固设有与齿轮箱的齿轮轴上的齿轮 74啮合的齿条 71， 可调拉杆 72的铰接轴低于下导电管 75的铰接轴。
整个接地闸刀 7通过传动机构与操动机构 4传动连接， 在操动机构 4的驱动下， 接 地闸刀 Ί能够上下摆动， 其中上摆为合闸运动， 下摆为分闸运动； 由于可调拉杆 72的 铰接轴低于下导电管 75的铰接轴， 在分合间运动过程中， 可调拉杆 72与下导电管 75 之间发生轴向相对运动， 使得可调拉杆 72上的齿条 71驱动齿轮旋转， 进而带动上导电 管 73与下导电管 75发生折叠动作， 其中， 合闸运动时接地闸刀 7逐渐伸直， 并在合闸 终了位置完全伸直， 而在接近合间位置时， 上导电管 73近似竖直向上运动， 从而带动 动触头 12由下往上插入到静触头 2的导向罩 21内并与梅花触指 23导电连接。
作为进一步优化， 为了能够满足动触头 12插入静触头 2内的深度要求， 在管母线 夹 6的夹持本体的底部固设有向下延伸的调节螺杆 11，所述静触头 2上下导向移动装配 在调节螺杆 11上， 并通过调节螺杆 11上螺纹装配的锁紧螺母实现锁紧定位。
作为进一步优化，所述传动机构包括依次铰接的支撑杆 9和连杆 10，支撑杆 9的末 端铰接在底座 8上， 连杆 10的末端铰接在下导电管 75的中间部位， 如图 6所示， 当接 地开关处于合闸状态时， 支撑杆 9和连杆 10重合成一条直线并与下导电管 75、 底座 8 配合形成一个三角框架结构，使接地间刀 7具有较高的刚度和稳定性，保证合间更可靠。
上述实施例的工作原理如下： 在分闸位置处， 下导电管 75和上导电管 73完全折叠 在一起并处于水平位置， 合间运动时， 可调拉杆 72通过齿轮齿条驱动上导电管 73逐渐 伸直， 在合闸终了位置， 上导电管 73完全伸直， 并带动动触头 12由下往上竖直插入到 静触头 2内与梅花触指 23电连， 合闸完成， 在合闸位置处， 下导电管 75和上导电管 73 均处于竖直位置； 分闸运动的过程与合闸运动的过程正好相反。
本发明的高压直流接地开关的静触头组件的实施例： 如图 1-4所示， 与上述实施例 中的静触头组件的结构一致， 其内容在此不再赘述。

Claims

权利要求书
1、 一种高压直流接地开关， 包括底座和动、 静触头， 底座上铰接有可上下摆动的折叠 式接地闸刀， 所述动触头固设在接地闸刀的顶端， 所述静触头位于接地闸刀的上方并在 接地闸刀上摆伸直时与动触头插接配合以实现合闸， 其特征在于： 该接地开关还包括用 于将所述静触头固定悬挂在管母线上的管母线夹， 管母线夹的顶部固连有上均压环、 底 部固连有下均压环， 所述静触头位于上、 下均压环的中心连线上。
2、 根据权利要求 1所述的高压直流接地开关， 其特征在于： 所述管母线夹包括夹持本 体以及固设在夹持本体下端的、 供所述静触头上下导向移动装配的调节螺杆， 调节螺杆 上螺纹装配有对静触头锁紧定位的锁紧螺母， 且夹持本体与静触头之间导电连接有软导 线。
3、 根据权利要求 1或 2所述的高压直流接地开关， 其特征在于： 所述底座和接地闸刀 之间设有用于与操动机构传动连接的传动机构，传动机构包括依次铰接的支撑杆和连杆， 支撑杆的末端铰接在底座上用于与操动机构传动连接， 连杆的末端铰接在接地间刀上。
4、 一种高压直流接地开关的静触头组件， 包括静触头， 其特征在于： 还包括用于将静 触头固定悬挂在管母线上的管母线夹， 管母线夹的顶部固连有上均压环、底部固连有下 均压环， 所述静触头位于上、 下均压环的中心连线上。
5、 根据权利要求 4所述的高压直流接地开关的静触头组件， 其特征在于： 所述管母线 夹包括夹持本体以及固设在夹持本体下端的、供所述静触头上下导向移动装配的调节螺 杆， 调节螺杆上螺纹装配有对静触头锁紧定位的锁紧螺母， 且夹持本体与静触头之间导 电连接有软导线。
PCT/CN2014/078657 2013-05-29 2014-05-28 一种高压直流接地开关及其静触头组件 WO2014190906A1 (zh)

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