WO2021052053A1 - 气体绝缘金属封闭中性点成套装置 - Google Patents

气体绝缘金属封闭中性点成套装置 Download PDF

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Publication number
WO2021052053A1
WO2021052053A1 PCT/CN2020/107593 CN2020107593W WO2021052053A1 WO 2021052053 A1 WO2021052053 A1 WO 2021052053A1 CN 2020107593 W CN2020107593 W CN 2020107593W WO 2021052053 A1 WO2021052053 A1 WO 2021052053A1
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Prior art keywords
neutral point
cylinder
inlet
gas
adapter
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PCT/CN2020/107593
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English (en)
French (fr)
Inventor
高美金
王婷婷
刘伟军
杨建华
黄江倩
周惠文
李矗
李建宇
狄谦
尹军华
康雪晶
贾芳丽
李燕华
谢晓磊
Original Assignee
国网浙江省电力有限公司经济技术研究院
国网浙江省电力有限公司温州供电公司
河南平高电气股份有限公司
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Application filed by 国网浙江省电力有限公司经济技术研究院, 国网浙江省电力有限公司温州供电公司, 河南平高电气股份有限公司 filed Critical 国网浙江省电力有限公司经济技术研究院
Priority to EP20801137.9A priority Critical patent/EP3823115B1/en
Publication of WO2021052053A1 publication Critical patent/WO2021052053A1/zh

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
    • H02B13/00—Arrangement of switchgear in which switches are enclosed in, or structurally associated with, a casing, e.g. cubicle
    • H02B13/02—Arrangement of switchgear in which switches are enclosed in, or structurally associated with, a casing, e.g. cubicle with metal casing
    • H02B13/035—Gas-insulated switchgear
    • H02B13/075—Earthing arrangements
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
    • H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
    • H02H9/06—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage using spark-gap arresters

Definitions

  • the invention relates to a gas-insulated metal-enclosed neutral point complete device.
  • the neutral point set device is also called the transformer neutral point set protection device, the neutral point gap protection set device, the transformer neutral point gap grounding protection device, the gap protection, etc., mainly used for the neutral point overvoltage of the power grid system protection.
  • the neutral point set device can realize two different operation modes of the neutral point of the transformer in the power system, which are grounded or ungrounded, so as to avoid the damage to the transformer due to the increase of the voltage of the neutral point of the transformer due to lightning or system failure.
  • An existing typical neutral point complete set of devices such as a Chinese patent for a neutral point gap grounding protection device for a transformer disclosed by the authorized announcement number CN205389099U and the authorized announcement date of 2016.07.20, includes a base, an isolating switch, a lightning arrester and a discharger. Gap, etc., after the transformer neutral point lead terminal is connected to the transformer neutral point, it is divided into three paths, namely the isolation switch, the arrester and the discharge gap.
  • This type of neutral point complete device is an open structure, with a porcelain sleeve as the equipment shell and external insulation. Due to the many exposed parts of the equipment, it is easily affected by the climate and environmental conditions, which is not conducive to the safe and reliable operation of the system.
  • the existing closed neutral point complete equipment needs to be equipped with more air chambers, the structure is relatively complicated, the cost is high, and there are many sealing points, which affects the reliability of the equipment.
  • the existing enclosed neutral point complete sets of equipment are all grounded at the cable inlet end, and the wiring method is relatively simple, which is not suitable for overhead line connection.
  • the purpose of the present invention is to provide a gas-insulated metal closed neutral point complete set device, which solves the problems that the existing closed type neutral point complete set equipment needs to be equipped with more gas chambers, the structure is relatively complicated, and the cost is high.
  • a complete set of gas-insulated metal-enclosed neutral point equipment including a lightning arrester, an isolating switch and a discharge gap;
  • the discharge gap includes a neutral point connection side and a grounding side, and the neutral point connection side is used for conducting with the neutral point of the transformer and grounding Side is used for grounding;
  • the lightning arrester and the isolating switch are both closed structures, both are arranged vertically, the top of the two is provided with a top conductive terminal, and the bottom is provided with a ground terminal;
  • the top of one of the lightning arrester and the isolating switch is provided with a wire inlet cylinder, the top of the other is provided with an adapter cylinder, and an intermediate cylinder is provided between the wire inlet cylinder and the adapter cylinder;
  • An intermediate conductor is arranged in the intermediate cylinder, and a transfer conductor is arranged in the adapter cylinder, and the intermediate conductor is connected to the lightning arrester below the adapter cylinder or the top conductive terminal on the isolation switch through the adapter conductor;
  • the neutral point connection side of the discharge gap is fixed on the top of the inlet cylinder, the ground side of the discharge gap is conductively connected to the adapter cylinder or is provided with a ground connection end, and the neutral point connection side of the discharge gap Both the ground side and the ground side are exposed to the air;
  • a branch conductive structure is provided in the inlet barrel, and the branch conductive structure is connected to the top conductive terminal of the arrester or isolation switch under the inlet barrel, the corresponding end of the intermediate conductor and the neutral point connection side of the arrester at the same time;
  • the body is also provided with an inlet terminal for conducting with the branch conductive structure, and/or an inlet terminal for conducting with the neutral point of the transformer is provided on the neutral point connection side of the discharge gap.
  • the structure of the gas insulated metal closed neutral point complete set device except for the discharge gap can form a closed structure, the intermediate conductor and the adapter
  • the conductor can ensure the connection between the arrester and the isolating switch and the neutral point of the transformer, thereby ensuring safety performance and reducing space occupation while meeting functional requirements.
  • the arrester and isolating switch can be used as the neutral point connection side of the discharge gap Compared with the support base on the grounding side, compared with the prior art, there is no need to set a separate discharge gap support base, and there is no need to set more cylinders, the structure is simple, and it is beneficial to reduce the cost.
  • one end of the intermediate cylinder near the inlet cylinder is provided with an inlet-side insulating basin, and the inlet-side insulating basin is used to isolate the intermediate cylinder from the inlet cylinder.
  • the installation of an insulating basin on the inlet side can realize the isolation of the corresponding compartments, improve reliability, and facilitate the connection and maintenance of the inlet wires.
  • the branch conductive structure is formed by a cross joint, one end of the cross joint is fixed on the inlet side insulating basin, and the other three ends are provided with plug-in conductive structures.
  • the cross joint is provided with a blind hole extending along the axial direction of the inlet-side insulating basin, and the bottom wall of the blind hole is fixed on the inlet-side insulating basin by screws.
  • the adoption of the above-mentioned fixing structure can ensure the reliable fixing of the cross joint, and at the same time facilitate the conduction between the cross joint and the intermediate conductor.
  • an end of the intermediate cylinder close to the adapter cylinder is provided with a transition side insulating basin, and the transition side insulating basin is used to isolate the intermediate cylinder and the transition cylinder.
  • Beneficial effects arranging the insulating basin on the transfer side can realize the isolation of the corresponding compartments and improve the reliability.
  • a switch-side insulating basin is provided between the transfer cylinder and the isolating switch, and the transfer-side insulating basin is used to isolate the adapting cylinder and the isolating switch.
  • Beneficial effects arranging an insulating basin on the switch side can realize isolation of corresponding compartments and improve reliability.
  • the gas-insulated metal-enclosed neutral point complete set device includes a zero-sequence current transformer, and the zero-sequence current transformer is sleeved on the ground side of the discharge gap.
  • the solution can be used to conveniently realize the fixation of the zero-sequence current transformer, which is convenient for maintenance.
  • the inlet terminal is a neutral point lead terminal arranged at the top end of the neutral point connection side of the discharge gap, and the neutral point lead terminal is conductively connected to the neutral point lead.
  • setting the neutral point lead terminal can meet the wiring demand of the overhead line and improve the applicability.
  • the wire inlet terminal provided on the wire inlet cylinder is a plug-in type cable terminal.
  • the plug-in type cable terminal completely separates the installation of the equipment from the cable system, and the cable terminal head can be directly unplugged during cable testing and maintenance, which is convenient and efficient.
  • Fig. 1 is a schematic structural view of an embodiment of a gas-insulated metal-enclosed neutral point complete device of the present invention
  • Fig. 2 is a schematic diagram of the internal structure of the gas-insulated metal-enclosed neutral point complete set of Fig. 1;
  • Figure 3 is a schematic circuit diagram of the gas-insulated metal-enclosed neutral point complete set of Figure 2;
  • FIG. 4 is a partial enlarged view of the branch conductive structure in the gas insulated metal closed neutral point complete set of FIG. 2;
  • Fig. 5 is a partial enlarged view of the transition conductor in the gas-insulated metal-enclosed neutral point complete set of Fig. 2;
  • Fig. 6 is a schematic diagram of the use state of the gas-insulated metal-enclosed neutral point complete set of device in Fig. 1 using a cable to connect to the neutral point of the transformer;
  • Fig. 7 is a schematic diagram of the use state of the gas-insulated metal-enclosed neutral point complete set device in Fig. 1 using an overhead line to connect to the neutral point of the transformer.
  • the names of the components corresponding to the corresponding reference signs in the figure are: 1-base, 2-lightning arrester, 3-isolating switch, 4-inlet cylinder, 51-intermediate cylinder, 52-intermediate conductor, 61-transition Cylinder, 62-transition conductor, 70-discharge gap, 71-neutral point connection side, 72-grounding side, 8-neutral point lead terminal, 91-inlet-side insulating basin, 92-transition-side insulating basin , 93-switch-side insulated basin, 10-cross connector, 11-blind hole, 12-plug-in cable terminal, 13-terminal socket, 14-transformer, 15-cable, 16-overhead line, 17-zero sequence Current Transformer.
  • FIG. 1 and 2 An embodiment of the gas-insulated metal-enclosed neutral point complete device in the present invention is shown in Figures 1 and 2, which includes a base 1, a lightning arrester 2, an isolating switch 3, an inlet cylinder 4, an intermediate cylinder 51, and a transition cylinder. 61 and the discharge gap 70.
  • the arrester 2 and the isolating switch 3 are both closed structures, both of which are arranged vertically, the top of the two is provided with a top conductive terminal, and the bottom is provided with a ground terminal.
  • the inlet cylinder 4 has a cross-shaped structure and is fixed on the upper end of the arrester 2, and the adapter cylinder 61 has a three-way structure and is fixed on the upper end of the isolating switch 3, and the intermediate cylinder 51 is connected to the inlet cylinder 4 and the adapter cylinder. ⁇ 61 Among them.
  • the arrester 2, the discharge gap 70 and the isolating switch 3 are arranged in parallel.
  • the isolating switch 3 is used to realize the direct grounding and isolation of the neutral point. It can be opened and closed manually or automatically. 2 and the discharge gap 70 can work normally.
  • the discharge gap 70 is a rod-shaped gap, and includes a neutral point connection side 71 and a grounding side 72. Both the neutral point connection side 71 and the grounding side 72 are exposed to the air.
  • the neutral point connection side 71 includes an insulating pillar and a discharge rod, and the discharge rod is fixed on the top of the insulating pillar.
  • the top of the insulating pillar is also provided with a neutral point lead terminal 8, and the neutral point lead terminal 8 is electrically connected to the neutral point lead.
  • the structures of the discharge gap 70 and the neutral point lead terminal 8 are both the prior art and will not be described in detail here.
  • the discharge gap 70 may also be a spherical gap.
  • the gas-insulated metal-enclosed neutral point complete set device also includes a zero sequence current transformer 17, which is sleeved on the ground side 72 of the discharge gap 70 for recording the neutral point zero sequence The current and the waveform of the discharge current in the discharge gap to facilitate the analysis of the fault.
  • one end of the intermediate cylinder 51 close to the inlet cylinder 4 is provided with an inlet-side insulating basin 91, which is used to isolate the intermediate cylinder 51 from the inlet cylinder. 4.
  • a switch-side insulating basin 93 is provided between the transfer cylinder 61 and the isolating switch, and the switch-side insulating basin 93 is used to isolate the adapting cylinder 61 and the isolating switch.
  • the intermediate cylinder 51 is provided with an intermediate conductor 52, and the adapter cylinder 61 is equipped with an adapter conductor 62.
  • the intermediate conductor 52 passes through the adapter conductor 62 and connects to the arrester 2 or the isolating switch 3 under the adapter cylinder 61.
  • the intermediate conductor 52 has an in-line structure, and the transfer conductor 62 has an L-shaped structure. In the direction shown in Fig. 2, the left end of the intermediate conductor 52 is inserted into the intermediate conductor 52 socket set on the inlet side insulating basin 91, the right end is inserted into the transfer conductor 62, and the lower end of the transfer conductor 62 is fixed on the switch side insulation Basin 93 on.
  • the inlet cylinder 4 is provided with a branch conductive structure, which is formed by a cross joint 10, and the cross joint 10 is provided with a shaft along the inlet side insulating basin 91
  • the bottom wall of the blind hole 11 is fixed to the inlet-side insulating basin 91 by screws, and is connected to the intermediate conductor socket through the conductive insert on the inlet-side insulating basin 91.
  • the other three ends of the cross joint 10 are provided with plug-in conductive structures.
  • the plug-in conductive structures are plug holes, which are respectively connected to the line terminals provided on the line-in barrel 4 and the lightning arrester 2 under the line-in barrel 4.
  • the top conductive terminal of the lightning arrester 2 and the neutral point connection side 71 of the arrester 2 are connected.
  • One end of the wire inlet cylinder 4 away from the intermediate cylinder 51 is provided with a pluggable cable terminal 12 for conducting a neutral point cable with a connector, and the other end of the neutral point cable is used to connect to the neutral point of the transformer.
  • the inner end of the plug-in cable terminal 12 is provided with a terminal socket 13, and the terminal socket 13 and the socket on the left end of the cross joint 10 are conducted through the terminal connecting conductor, thereby realizing the neutral point of the transformer and the arrester 2, the discharge gap 70 and the isolation switch 3 are turned on.
  • the plug-in conductive structure realizes conduction with the corresponding plug-in connector through the conductive contact fingers.
  • each of the above-mentioned cylinders is filled with sulfur hexafluoride gas to achieve insulation.
  • the grounding terminals at the bottom of the arrester 2 and the isolating switch 3 are led to the main grounding grid through the base 1 or through the ground
  • the row is led to the main grounding grid, and the grounding side 72 of the discharge gap 70 is led to the main grounding grid through the switching cylinder 61, the cylinder of the isolating switch 3, or the grounding bar drawn from the ground connection end.
  • the gas-insulated metal-enclosed neutral point set device When connected to the transformer 14, as shown in Figure 6, the gas-insulated metal-enclosed neutral point set device can be connected to the neutral point of the transformer 14 by using a cable 15 or, as shown in Figure 7, the gas-insulated metal closed neutral point set The device may be connected to the neutral point of the transformer 14 by using an overhead line 16.
  • the isolating switch 3 is in the off position.
  • the arrester 2 acts to absorb and release the overvoltage to protect the neutral point insulation of the transformer from damage.
  • the discharge gap 70 will not be broken down.
  • transient overvoltages such as ferromagnetic resonance and high-frequency resonance occur in the system, the discharge gap 70 will break down and discharge, and the overvoltage will fall on the gap.
  • the overvoltage energy will be released into the ground.
  • the neutral point of the transformer will be grounded instantaneously to prevent The accident continued to develop, and the arrester 2 was protected from thermal collapse accidents.
  • the isolating switch 3 can be closed manually or automatically to meet the direct grounding requirements.
  • the inlet barrel 4 is arranged on the top of the arrester 2, and the adapter barrel 61 is arranged on the top of the isolating switch 3. In other embodiments, the inlet barrel 4 may also be arranged on the top of the isolating switch 3.
  • the adapter cylinder 61 is arranged on the top of the arrester 2.
  • the branch conductive structure is a cross-shaped structure with plug sockets at three ends.
  • each connection end of the branch conductive structure can be a screw fixing structure. 4 is provided with a hand hole for disassembly and assembly operations, which is a common technical means in this field, and will not be described in detail here.
  • the respective cylinders are provided with corresponding insulated basins to isolate each other.
  • the cylinders can also be arranged as mutually connected air chambers, for example, connecting-type insulated basins are used, for example, An insulated basin equipped with a through valve is used, and two adjacent compartments can be connected or separated according to the needs.
  • the structures of the above-mentioned various insulating basins are all the prior art, and the detailed description is omitted here.
  • a transition-side insulating basin may also be provided at one end of the intermediate cylinder 51 close to the transition cylinder 61, and the transition-side insulating basin is used to isolate the intermediate cylinder 51 and the adapter cylinder 61.
  • the right end of the intermediate conductor 52 and the left end of the transit conductor 62 may both be connected to the conductive insert in the center of the insulating basin on the transit side.
  • the plug-in type cable terminal 12 is provided on the wire inlet cylinder 4 as the wire inlet terminal, and the top end of the neutral point connection side 71 of the discharge gap 70 is provided with a neutral point lead terminal 8.
  • the wire inlet terminal on the wire inlet barrel 4 may also be a neutral point lead terminal 8, and the wire inlet terminal may be provided only at the wire inlet barrel 4, or only in the discharge gap 70.
  • the neutral point connection side 71 is provided with an incoming terminal.
  • the wire inlet cylinder 4 may be a three-way structure, and the branch conductive structure may be a three-way joint.
  • the zero-sequence current transformer is sleeved on the ground side of the discharge gap.
  • the zero-sequence current transformer can also take other forms, for example, set on the neutral point connection side.

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  • Gas-Insulated Switchgears (AREA)

Abstract

本发明涉及气体绝缘金属封闭中性点成套装置。气体绝缘金属封闭中性点成套装置，其避雷器和隔离开关均为封闭式结构，两者均竖直布置；避雷器和隔离开关的其中一个的顶部设有进线筒体，另一个的顶部设有转接筒体；进线筒体与转接筒体之间设有中间筒体，中间筒体内设有中间导体，转接筒体内设有转接导体，中间导体通过转接导体与转接筒体下方的避雷器或隔离开关上的顶部导电端子连接；放电间隙的中性点连接侧固定在进线筒体的顶部，放电间隙的接地侧与转接筒体导电连接或设有接地连接端，进线筒体内设有分支导电结构。上述方案解决了现有的封闭式中性点成套设备需要设置较多的气室，结构较为复杂，成本高的问题。

Description

气体绝缘金属封闭中性点成套装置 技术领域
本发明涉及气体绝缘金属封闭中性点成套装置。
背景技术
中性点成套装置也被称为变压器中性点成套保护装置、中性点间隙保护成套装置、变压器中性点间隙接地保护装置、间隙保护等等，主要用于电网系统的中性点过电压保护。中性点成套装置可实现电力系统中变压器中性点接地运行或不接地运行两种不同的运行方式，从而避免由于雷电或系统故障引起变压器中性点电压升高而对变压器造成侵害。
现有的一种典型中性点成套装置如授权公告号为CN205389099U、授权公告日为2016.07.20的中国专利公开的一种变压器中性点间隙接地保护装置，包括底座、隔离开关、避雷器和放电间隙等，变压器中性点引线端子与变压器中性点连接后分为三路，分别为隔离开关、避雷器和放电间隙。该类中性点成套装置为敞开式结构，以瓷套作为设备外壳及外绝缘，因设备外露部件多，易受气候环境条件的影响，不利于系统的安全及可靠运行。
现有技术中也有采用封闭式结构的中性点成套装置，例如申请公布号为CN108512107A、申请公布日为2018.09.07的中国专利申请公开的一种利用SF 6进行绝缘的交流中性点成套GIS装置，将放电间隙、隔离开关、避雷器设置在相应的气室罐内，能够避免污染，减小空间占用、增加使用寿命。授权公告号为CN205029338U、授权公告日为2016.02.10的中国专利也公开了类似结构。
但是，现有的封闭式中性点成套设备需要设置较多的气室，结构较为复杂，成本高，并且密封点较多，影响设备的可靠性。同时，现有的封闭式中性 点成套设备均采用电缆进线端接地，接线方式较为单一，不能适用于架空线连接。
发明内容
本发明的目的是提供一种气体绝缘金属封闭中性点成套装置，解决现有的封闭式中性点成套设备需要设置较多的气室，结构较为复杂，成本高的问题。
本发明中采用的技术方案如下。
气体绝缘金属封闭中性点成套装置，包括避雷器、隔离开关和放电间隙；所述放电间隙包括中性点连接侧和接地侧，中性点连接侧用于与变压器的中性点导通，接地侧用于接地；
所述避雷器和隔离开关均为封闭式结构，两者均竖直布置，两者的顶部设有顶部导电端子，底部设有接地端子；
避雷器和隔离开关的其中一个的顶部设有进线筒体，另一个的顶部设有转接筒体，进线筒体与转接筒体之间设有中间筒体；
所述中间筒体内设有中间导体，转接筒体内设有转接导体，所述中间导体通过转接导体与转接筒体下方的避雷器或隔离开关上的顶部导电端子连接；
所述放电间隙的中性点连接侧固定在进线筒体的顶部，所述放电间隙的接地侧与转接筒体导电连接或设有接地连接端，所述放电间隙的中性点连接侧和接地侧均暴露在空气中；
进线筒体内设有分支导电结构，分支导电结构同时与进线筒体下方的避雷器或隔离开关上的顶部导电端子、中间导体的对应端和避雷器的中性点连接侧导通；进线筒体还设有用于与分支导电结构导通的进线端子，并且/或者所述放电间隙的中性点连接侧上设有用于与变压器的中性点导通的进线端子。
有益效果：采用上述方案，通过设置进线筒体、转接筒体和中间筒体， 气体绝缘金属封闭中性点成套装置除了放电间隙外的结构均能够形成封闭式结构，中间导体和转接导体能够保证避雷器和隔离开关与变压器的中性点的连接，进而能够在满足功能要求的情况下保证安全性能、减小空间占用，同时，避雷器和隔离开关能够作为放电间隙的中性点连接侧和接地侧的支撑底座，与现有技术相比，不需要设置单独的放电间隙支撑底座，也不需要设置较多的筒体，结构简单，有利于降低成本。
作为一种优选的技术方案，所述中间筒体靠近进线筒体的一端设有进线侧绝缘盆子，进线侧绝缘盆子用于隔离中间筒体与进线筒体。
有益效果：设置进线侧绝缘盆子能够实现相应隔室的隔离，提高可靠性，便于进线的连接及维护。
作为一种优选的技术方案，所述分支导电结构由十字接头形成，十字接头的一端固定在所述进线侧绝缘盆子上，另外三个端头设有插接导电结构。
有益效果：采用十字接头结构简单，固定方便。
作为一种优选的技术方案，所述十字接头上设有沿进线侧绝缘盆子的轴向延伸的盲孔，盲孔的底壁通过螺钉固定在进线侧绝缘盆子上。
有益效果：采用上述固定结构能够保证十字接头的可靠固定，同时便于实现十字接头与中间导体的导通。
作为一种优选的技术方案，中间筒体靠近转接筒体的一端设有转接侧绝缘盆子，转接侧绝缘盆子用于隔离中间筒体与转接筒体。
有益效果：设置转接侧绝缘盆子能够实现相应隔室的隔离，提高可靠性。
作为一种优选的技术方案，所述转接筒体与隔离开关之间设有开关侧绝缘盆子，转接侧绝缘盆子用于隔离转接筒体与隔离开关。
有益效果：设置开关侧绝缘盆子能够实现相应隔室的隔离，提高可靠性。
作为一种优选的技术方案，所述气体绝缘金属封闭中性点成套装置包括零序电流互感器，所述零序电流互感器套设在所述放电间隙的接地侧上。
有益效果：采用该方案能够方便地实现零序电流互感器的固定，便于维护。
作为一种优选的技术方案，所述进线端子为设置在放电间隙的中性点连接侧的顶端的中性点引线端子，中性点引线端子供中性点引线导电连接。
有益效果：设置中性点引线端子能够满足架空线的接线需求，提高适用性。
作为一种优选的技术方案，进线筒体上设置的进线端子为插拔式电缆终端。
有益效果：插拔式电缆终端使设备的安装与电缆系统完全分开，在电缆试验、检修时，可直接将电缆终端头拔出，便捷高效。
附图说明
图1是本发明中气体绝缘金属封闭中性点成套装置的一个实施例的结构示意图；
图2是图1的气体绝缘金属封闭中性点成套装置的内部结构示意图；
图3是图2的气体绝缘金属封闭中性点成套装置的电路原理图；
图4是图2的气体绝缘金属封闭中性点成套装置中分支导电结构处的局部放大图；
图5是图2的气体绝缘金属封闭中性点成套装置中转接导体处的局部放大图；
图6是图1中的气体绝缘金属封闭中性点成套装置采用电缆与变压器的中性点连接的使用状态示意图；
图7是图1中的气体绝缘金属封闭中性点成套装置采用架空线与变压器的中性 点连接的使用状态示意图。
图中相应附图标记所对应的组成部分的名称为：1-底座，2-避雷器，3-隔离开关，4-进线筒体，51-中间筒体，52-中间导体，61-转接筒体，62-转接导体，70-放电间隙，71-中性点连接侧，72-接地侧，8-中性点引线端子，91-进线侧绝缘盆子，92-转接侧绝缘盆子，93-开关侧绝缘盆子，10-十字接头，11-盲孔，12-插拔式电缆终端，13-终端插接座，14-变压器，15-电缆，16-架空线，17-零序电流互感器。
具体实施方式
下面结合附图对本发明作进一步说明。
本发明中气体绝缘金属封闭中性点成套装置的一个实施例如图1和图2所示，包括底座1、避雷器2、隔离开关3、进线筒体4、中间筒体51、转接筒体61和放电间隙70。所述避雷器2和隔离开关3均为封闭式结构，两者均竖直布置，两者的顶部设有顶部导电端子，底部设有接地端子。进线筒体4为十字形结构，固定在避雷器2的上端，转接筒体61为三通结构，固定在隔离开关3的上端，中间筒体51连接在进线筒体4与转接筒体61之间。如图2和图3所示，避雷器2、放电间隙70和隔离开关3为并联设置，隔离开关3用于实现中性点的直接接地和隔离，可以手动或自动分合闸，分闸时避雷器2和放电间隙70能够正常工作。
如图1和图2所示，放电间隙70为棒形间隙，包括中性点连接侧71和接地侧72，中性点连接侧71和接地侧72均暴露在空气中。中性点连接侧71包括绝缘支柱和放电棒，放电棒固定在绝缘支柱的顶端。绝缘支柱的顶端还设有中性点引线端子8，中性点引线端子8供中性点引线导电连接。放电间隙70和 中性点引线端子8的结构均为现有技术，此处不再详细说明。当然，在其他实施例中放电间隙70也可以是球形间隙。所述气体绝缘金属封闭中性点成套装置还包括零序电流互感器17，所述零序电流互感器17套设在所述放电间隙70的接地侧72上，用于记录中性点零序电流和放电间隙的放电电流的波形，以便于对故障进行分析。
如图2和图4所示，所述中间筒体51靠近进线筒体4的一端设有进线侧绝缘盆子91，进线侧绝缘盆子91用于隔离中间筒体51与进线筒体4。所述转接筒体61与隔离开关之间设有开关侧绝缘盆子93，开关侧绝缘盆子93用于隔离转接筒体61与隔离开关。
中间筒体51内设有中间导体52，转接筒体61内设有转接导体62，所述中间导体52通过转接导体62与转接筒体61下方的避雷器2或隔离开关3上的顶部导电端子连接。中间导体52为一字形结构，转接导体62为L形结构。以图2所示方向，中间导体52左端插接在进线侧绝缘盆子91上设置的中间导体52插接座上，右端插入转接导体62上，转接导体62的下端固定在开关侧绝缘盆子93上。
如图2、图4和图5所示，进线筒体4内设有分支导电结构，分支导电结构由十字接头10形成，所述十字接头10上设有沿进线侧绝缘盆子91的轴向延伸的盲孔11，盲孔11的底壁通过螺钉固定在进线侧绝缘盆子91上并通过进线侧绝缘盆子91上的导电嵌件与中间导体插接座导通。十字接头10的另外三个端头设有插接导电结构，该插接导电结构为插接孔，分别与进线筒体4上设置的进线端子、进线筒体4下方的避雷器2上的顶部导电端子和避雷器2的中性点连接侧71导通。进线筒体4远离中间筒体51的一端设有插拔式电缆终端12，供带有接头的中性点电缆导通，中性点电缆的另一端用于与变压器的中性点连 接。插拔式电缆终端12的内端设有终端插接座13，终端插接座13与十字接头10左端的插接座通过终端连接导体导通，进而实现变压器中性点与避雷器2、放电间隙70和隔离开关3的导通。当然，作为本领域的惯用技术手段，插接导电结构通过导电触指与相应的插接头实现导通。
气体绝缘金属封闭中性点成套装置装配完成后，各上述筒体内充入六氟化硫气体以实现绝缘，避雷器2和隔离开关3底部的接地端子通过底座1引至主接地网接地或通过接地排引至主接地网接地，放电间隙70的接地侧72通过转接筒体61、隔离开关3的筒体或从接地连接端上引出的接地排引至主接地网接地。与变压器14连接时，如图6所示，气体绝缘金属封闭中性点成套装置可以采用电缆15与变压器14的中性点连接，或者，如图7所示，气体绝缘金属封闭中性点成套装置可以采用架空线16与变压器14的中性点连接。
运行过程中，正常情况下，隔离开关3处于断开位置。当雷电过电压和一般操作过电压入侵时，避雷器2动作，吸收并释放过电压量，保护变压器中性点绝缘免受其害，此种情况下放电间隙70不会被击穿。当系统发生了铁磁谐振、高频谐振等暂态过电压时，放电间隙70击穿放电，过电压全部降在间隙上，过电压能量释入地中，变压器中性点瞬时接地运行，防止事故持续发展，并保护避雷器2免除热崩溃事故的发生。根据需要，隔离开关3可以手动或自动合闸，满足直接接地需求。
在上述实施例中，进线筒体4设置在避雷器2顶部，转接筒体61设置在隔离开关3顶部，在其他实施例中，也可以将进线筒体4设置在隔离开关3顶部，而将转接筒体61设置在避雷器2顶部。
在上述实施例中，分支导电结构为三端设有插接座的十字形结构，在其他实施例中，分支导电结构的各连接端可以均采用螺钉固定结构，此时可以在 进线筒体4上设置手孔来进行拆装作业，这是本领域的惯用技术手段，此处不再详细说明。
在上述实施例中，各筒体之间设有相应的绝缘盆子相互隔离，在其他实施例中，也可以将各筒体设置为相互连通的气室，例如采用连通型绝缘盆子，再如，采用装有通阀的绝缘盆子，根据需要选择连通两相邻隔室，或者隔离两相邻隔室。上述各种绝缘盆子的结构均为现有技术，此处不再详细说明。另外，在其他实施例中，也可以在中间筒体51靠近转接筒体61的一端设有转接侧绝缘盆子，转接侧绝缘盆子用于隔离中间筒体51与转接筒体61，此时，中间导体52的右端以及转接导体62的左端可以均连接到转接侧绝缘盆子中心的导电嵌件上。
在上述实施例中，进线筒体4上设有插拔式电缆终端12作为进线端子，放电间隙70的中性点连接侧71的顶端设有中性点引线端子8。在本发明的其他实施例中，进线筒体4上的进线端子也可以采用中性点引线端子8，而且可以仅在进线筒体4处设置进线端子，或者仅在放电间隙70的中性点连接侧71设置进线端子。在放电间隙70的中性点连接侧71设置进线端子时，进线筒体4可以是三通结构，而分支导电结构可以为三通接头。
在上述实施例中，零序电流互感器套设在所述放电间隙的接地侧上，在其他实施中，零序电流互感器也可以采用其他形式，例如设置到中性点连接侧上。
最后需要说明的是，以上所述仅为本发明的优选实施例而已，并不用于限制本发明，尽管参照前述实施例对本发明进行了详细的说明，对于本领域的技术人员来说，其依然可以对前述各实施例所记载的技术方案进行不需付出创造性劳动的修改，或者对其中部分技术特征进行等同替换。凡在本发明的精神 和原则之内，所作的任何修改、等同替换、改进等，均应包含在本发明的保护范围之内。

Claims (9)

  1. 气体绝缘金属封闭中性点成套装置，包括避雷器、隔离开关和放电间隙；所述放电间隙包括中性点连接侧和接地侧，中性点连接侧用于与变压器的中性点导通，接地侧用于接地；其特征在于：
    所述避雷器和隔离开关均为封闭式结构，两者均竖直布置，两者的顶部设有顶部导电端子，底部设有接地端子；
    避雷器和隔离开关的其中一个的顶部设有进线筒体，另一个的顶部设有转接筒体；进线筒体与转接筒体之间设有中间筒体；
    所述中间筒体内设有中间导体，转接筒体内设有转接导体，所述中间导体通过转接导体与转接筒体下方的避雷器或隔离开关上的顶部导电端子连接；
    所述放电间隙的中性点连接侧固定在进线筒体的顶部，所述放电间隙的接地侧与转接筒体导电连接或设有接地连接端，所述放电间隙的中性点连接侧和接地侧均暴露在空气中；
    进线筒体内设有分支导电结构，分支导电结构同时与进线筒体下方的避雷器或隔离开关上的顶部导电端子、中间导体的对应端和避雷器的中性点连接侧导通；
    进线筒体还设有用于与分支导电结构导通的进线端子，并且/或者所述放电间隙的中性点连接侧上设有用于与变压器的中性点导通的进线端子。
  2. 根据权利要求1所述的气体绝缘金属封闭中性点成套装置，其特征在于：所述中间筒体靠近进线筒体的一端设有进线侧绝缘盆子，进线侧绝缘盆子用于隔离中间筒体与进线筒体。
  3. 根据权利要求2所述的气体绝缘金属封闭中性点成套装置，其特征在于： 所述分支导电结构由十字接头形成，十字接头的一端固定在所述进线侧绝缘盆子上，另外三个端头设有插接导电结构。
  4. 根据权利要求3所述的气体绝缘金属封闭中性点成套装置，其特征在于：所述十字接头上设有沿进线侧绝缘盆子的轴向延伸的盲孔，盲孔的底壁通过螺钉固定在进线侧绝缘盆子上。
  5. 根据权利要求2至4中任一权利要求所述的气体绝缘金属封闭中性点成套装置，其特征在于：中间筒体靠近转接筒体的一端设有转接侧绝缘盆子，转接侧绝缘盆子用于隔离中间筒体与转接筒体。
  6. 根据权利要求2至4中任一权利要求所述的气体绝缘金属封闭中性点成套装置，其特征在于：所述转接筒体与隔离开关之间设有开关侧绝缘盆子，开关侧绝缘盆子用于隔离转接筒体与隔离开关。
  7. 根据权利要求1至4中任一权利要求所述的气体绝缘金属封闭中性点成套装置，其特征在于：所述气体绝缘金属封闭中性点成套装置包括零序电流互感器，所述零序电流互感器套设在所述放电间隙的接地侧上。
  8. 根据权利要求1至4中任一权利要求所述的气体绝缘金属封闭中性点成套装置，其特征在于：所述进线端子为设置在放电间隙的中性点连接侧的顶端的中性点引线端子，中性点引线端子供中性点引线导电连接。
  9. 根据权利要求1至4中任一权利要求所述的气体绝缘金属封闭中性点成套装置，其特征在于：进线筒体上设置的进线端子为插拔式电缆终端。
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CN113991452B (zh) * 2021-10-09 2024-02-09 盛中意电力科技有限公司 精密化中置开关柜

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