WO2018086561A1

WO2018086561A1 - Gas-insulated bus grounding component, grounding device and gas-insulated switch cabinet

Info

Publication number: WO2018086561A1
Application number: PCT/CN2017/110208
Authority: WO
Inventors: 邬建刚; 陈慎言; 谭燕; 顾晓冬; 张佳飞
Original assignee: 上海天灵开关厂有限公司; 平高集团有限公司; 国家电网公司
Priority date: 2016-11-12
Filing date: 2017-11-09
Publication date: 2018-05-17
Also published as: CN106384961B; CN106384961A

Abstract

A quick gas-insulated bus grounding device, comprising: a gas filled compartment body (30) comprising a gas filled compartment (11) and a pressure relief channel (13), a pressure relief device (12) being provided between the pressure relief channel (13) and the gas filled compartment (11), and a self-sealing valve (14) being provided on the gas filled compartment (11); six bus bushings (1) mounted on side plates of the gas filled compartment (11), two bus bushings (1) forming a phase and being opposite to each other; a three-phase main busbar (7) located in the gas filled compartment (11), each phase of main busbar (7) being mounted between two bus bushings (1) of corresponding phase and being connected to a main bus of an external switch cabinet by means of two bus bushings (1) of the phase; a three-phase grounding component (3) located in the gas filled compartment (11), an upper end of each phase of grounding component (3) being connected to the main busbar (7) of corresponding phase, and a lower end of a guide rod (4) in each phase of grounding component (3) being supported on a side plate in the gas filled compartment (11); and a driving mechanism (15) configured to drive the three-phase grounding component (3) to achieve grounding on/off. The device satisfies reliable grounding of a main bus of a gas-insulated switch cabinet, and has strong closing capability, small volume and high safety.

Description

Gas insulated busbar grounding component, grounding device and gas insulated switchgear

Technical field

The invention relates to the technical field of gas insulated switchgear, in particular to a gas insulated busbar grounding component, a grounding device and a gas insulated switchgear.

Background technique

The grounding switch is an important component of the switchgear. It is usually installed inside the switchgear. When the power supply line or equipment fails and the normal maintenance is over, the grounding switch can be closed to achieve grounding of the main busbar or the branch busbar.

Gas insulated switchgear is a high-tech product in the field of medium voltage switch. The voltage level is generally 12~40.5kV, and the short-circuit current withstand capability is generally below 40kA. It is equipped with high-voltage components such as circuit breakers, disconnectors and grounding switches. In the metal cabinet, SF6 gas or other insulating gas filled with low pressure is used as an insulating medium to achieve isolation from the external environment and improve the stability of the operation of the switchgear.

The existing gas insulated earthing switch device is generally a rotary knife gate structure, which adopts a front, middle and rear arrangement, and is generally applied to a 12 kV voltage class switchgear, and the short circuit closing capability is below 25 kA. The grounding device is generally provided with a mounting bracket, a closing contact for connecting with the busbar, a grounding blade connected to the rotating spindle, a high-voltage component is insulated from the ground through the supporting insulator, and a rotating mechanism is driven by a spring mechanism to quickly act to realize the grounding switch. brake. This structure can correctly perform all the functions required for grounding, but because of its knife-gate structure, the grounding blade is generally a flat copper bar with a tip or a small rounded corner at the end, resulting in poor electric field distribution of the fracture and easy to cause tip discharge. phenomenon. In the closing process, if there is a preset short circuit in the system, the contact movement process is more likely to produce pre-breakdown, causing arc ablation to the ordinary copper knife gate, causing serious damage to the grounding switch. If the earthing switch is installed inside the gas-insulated switchgear, it cannot be repaired in time, posing a safety hazard.

The existing gas-insulated direct-acting three-position switch can realize the grounding function of the line. The direct-acting three-position switch generally uses the screw to drive the moving contact to move back and forth to realize the function of closing, opening and grounding. The grounding closing process adopts a slow speed action. Therefore, such a direct-acting three-position switch cannot realize the grounding short-circuit closing function, and the corresponding vacuum interrupter closing is required to achieve the grounding closing, and more components are used. The structure and interlocking device are complicated and costly.

Summary of the invention

The technical problem to be solved by the present invention is that the current grounding switch has weak insulation capability and cannot meet the application of the 40.5 kV voltage level. The volume is large, and it cannot be matched with the compact gas insulated switchgear. The closing ability is weak and the safety is not high, which cannot be realized. The maintenance-free shortcoming provides a gas-insulated busbar quick-grounding device that can be connected to the main busbar of the gas-insulated switchgear to realize the reliable grounding function of the main busbar of the gas-insulated switchgear. The invention is based on the function of the grounding switch, and realizes the gas insulation of the grounding switch device, and performs a new structural design on the grounding switch to meet the requirements of high insulation capability and high grounding closing capability, realizes maintenance-free design and meets high voltage level. application.

The technical problem to be solved by the present invention can be achieved by the following technical solutions:

A gas insulated busbar grounding component, the grounding component comprising a static contact, a movable contact, a contact pipe, an insulation cylinder and a contact seat, the movable contact being fixed on the top end of the contact pipe and electrically connected to the contact pipe Connecting, the upper end of the insulating cylinder is fixedly connected to the static contact, the lower end of the insulating cylinder is fixedly connected with the contact seat, the insulating cylinder has an inner hole therein, and the contact seat has the insulation a central hole coaxial with the inner bore of the barrel, the contact tube being inserted into the inner bore of the insulating barrel through a central hole of the contact seat, the contact seat passing through a central hole wall of the contact seat The upper contact finger is electrically connected to the contact pipe; when the grounding is closed, the contact pipe moves upward to bring the movable contact into contact with the static contact, and when the ground is opened, the contact pipe moves downward The movable contact is separated from the stationary contact.

Further, a guide ring is further mounted on the contact tube, and an outer circumference of the guide ring is sealingly abutted against an inner hole wall of the insulation tube, and the portion between the guide ring and the contact seat is insulated. Inner bore Forming a pressure space, an arc extinguishing air passage is disposed between the pressure space and the insulating gas outside the insulating cylinder, and when the grounding component is grounded, the insulating gas outside the insulating cylinder passes through a unique arc extinguishing The air flow channel and the driven contact flow to the pressure space, and the flow of the arc extinguishing gas is generated between the movable contact and the static contact.

Further, a ventilation hole is disposed on the static contact, and a space formed by the inner hole of the portion of the insulation tube between the guide ring and the static contact passes through the ventilation hole and the outside of the insulation tube Insulating gas is connected.

Further, the contact tube is provided with at least one radial through hole; the movable contact is fixedly electrically connected to the contact tube through a connecting member, and a central through hole is defined in the connecting member, A central through hole in the connector communicates with a radial through hole on the contact tube, and a radial through hole on the contact tube communicates with the pressure space.

Further, the connecting member is a screw.

Further, the movable contact is a self-supporting contact, and a notch of a certain distance is opened between the fingers.

Further, the grounding assembly further includes a shield cover disposed on a periphery of the upper portion of the stationary contact and the insulating barrel.

Further, the grounding assembly includes a shorting busbar, and the shorting busbar is fixed to the contact and electrically connected to the contact.

Further, the grounding assembly further includes a guiding rod, an inner hole of the contact tube is sleeved on the guiding rod, and the contact tube moves up and down along the guiding rod.

The present invention also provides a gas insulated busbar quick grounding device, the grounding device comprising the grounding component of any of the above, and further comprising:

An inflatable compartment body, the inflatable compartment body comprising an inflation compartment, on which an inflation joint is disposed, and a self-sealing valve is mounted on the inflation joint;

Six busbar bushings mounted on opposite side panels of the inflatable compartment; one for each of the two busbar bushings Phase, relative setting;

a three-phase main busbar located in the air-filled compartment, each phase of the main busbar is installed between two busbar bushings of the corresponding phase, and each phase of the main busbar passes through the two busbar bushings of the phase and the external switchgear main Busbar connection;

The grounding component is a three-phase grounding component, and an upper end of each phase grounding component is connected to a main busbar of a corresponding phase;

Further, the grounding device includes a driving mechanism for driving a three-phase grounding component to achieve a grounding closing and a grounding opening, the driving mechanism comprising: an operating mechanism, a main shaft and a cranking arm, and the operating mechanism is mounted on the airing partition Outdoorly, the main shaft is driven to rotate by the operating mechanism, the main shaft is inserted into the air-filled compartment, the arm is mounted on the main shaft, and the main shaft synchronously drives the arm to rotate, and the arm passes through a moving rod and a The contact pipe is hinged, and the arm moves the corresponding contact pipe up and down by the moving rod.

Further, the inflatable compartment body includes a pressure relief device disposed between the pressure relief passage and the inflation compartment, the pressure relief device being disposed at a top or bottom of the inflation compartment.

A gas insulated busbar quick grounding device according to another embodiment of the present invention includes:

An inflatable compartment body, the inflatable compartment body including an inflation compartment and a pressure relief passage, a pressure relief device disposed between the pressure relief passage and the inflation compartment, and an inflation device disposed on the inflation compartment a joint on which a self-sealing valve is mounted;

Six busbar bushings mounted on opposite side plates of the inflatable compartment; each of the two busbar bushings is a phase, oppositely disposed;

a main busbar located in the three-phase compartment of the air-filled compartment, each phase of the main busbar is installed between two busbar bushings of the corresponding phase, and each phase of the main busbar passes through the two busbar bushings of the phase and the external switchgear main Busbar connection;

a three-phase grounding assembly located in the air-filled compartment, the upper end of each phase-grounding component is connected to the main busbar of the corresponding phase, and the lower end of the guiding rod in each phase-cored component is supported on one side of the inflatable compartment Board connection

A drive mechanism that drives a three-phase grounding assembly to achieve grounding and grounding tripping.

In a preferred embodiment of the invention, a self-sealing valve is mounted on the inflatable joint.

In a preferred embodiment of the invention, each phase-to-phase component further comprises:

a static contact fixedly connected to the main busbar;

An insulating cylinder fixedly connected to the static contact at the upper end, the insulating cylinder has an inner hole therein;

a contact seat fixed to a lower end of the insulation barrel, the contact seat having a center hole coaxial with an inner hole of the insulation barrel, and a middle upper portion of the guide rod is inserted into a center hole of the contact seat In the inner bore of the insulating cylinder;

a contact tube having an inner hole for being sleeved on the guide rod, an inner hole of the contact tube is sleeved on the guide rod; the contact tube also passes through the contact seat a central hole inserted into the inner bore of the insulating cylinder; the contact is electrically connected to the contact tube by a finger disposed on a wall of the central bore of the contact; the contact and the drive a mechanism driving connection, driven by the driving mechanism to move up and down along the guiding rod;

a movable contact fixed to the top end of the contact pipe and electrically connected to the contact pipe, when the grounding is closed, the contact pipe moves upward to bring the movable contact into contact with the static contact, and when the ground is opened, the ground contact The downward movement of the contact pipe drives the movable contact to be separated from the static contact;

A shorting busbar fixed to the contact and electrically connected to the contact, the shorting busbar being electrically connected to a side panel of the inflatable compartment.

In a preferred embodiment of the present invention, a shield cover is disposed on the stationary contact, and the shield covers the periphery of the upper portion of the stationary contact and the insulating barrel.

In a preferred embodiment of the invention, a guide ring is further mounted on the contact tube, and an outer circumference of the guide ring is in sliding contact with an inner hole wall of the insulating barrel.

In a preferred embodiment of the present invention, a first sealing ring is disposed on an outer circumference of the guiding ring, and the first sealing ring is for sealing an outer circumference of the guiding ring and an inner hole wall of the insulating barrel Contact gap between.

In a preferred embodiment of the present invention, a second sealing ring is disposed on a hole wall of the center hole of the contact seat, and the second sealing ring is used for sealing a hole wall of the center hole of the contact seat. The outer circumference of the contact Contact gap between the walls.

In a preferred embodiment of the present invention, a third sealing ring is disposed on the hole wall of the inner hole of the contact pipe, and the third sealing ring is used for sealing the inner hole of the contact pipe and the guiding rod The gap between the outer peripheral faces.

In a preferred embodiment of the present invention, the movable contact is mounted on the contact tube by a screw, a central through hole is defined in the screw, and at least one diameter is opened on the contact tube. a central through hole on the screw is communicated with a radial through hole on the contact pipe; the inner hole of the insulating cylinder between the guide ring and the contact seat constitutes a pressure space, A radial through hole on the contact pipe communicates with the pressure space; a ventilation hole is disposed on the static contact.

In a preferred embodiment of the present invention, the movable contact is a self-supporting contact, and a notch of a certain distance is opened between the fingers.

In a preferred embodiment of the invention, the pressure relief device is disposed at the top or bottom of the inflatable compartment.

In a preferred embodiment of the invention, the drive mechanism comprises:

An operating mechanism installed outside the inflatable compartment;

a spindle driven by the operating mechanism, the spindle being inserted into the inflation compartment;

Three arms are mounted on the main shaft at an axial interval of the main shaft, and the main shaft synchronously drives three arm rotations, and each of the armes is hinged to the contact cylinder through a moving rod, and each of the arm passes The moving rod drives the corresponding contact cylinder to move up and down.

The invention realizes a gas insulated busbar grounding device which satisfies the reliable grounding of the main busbar of the gas insulated switchgear, has strong sealing ability, small volume and high safety, and the basic principle is to connect the busbar bushing and the main busbar of the main busbar. The grounding component and the transmission system are sealed in the air-filled compartment, and the grounding component is mounted on the main busbar connected to the busbar bushing, and the grounding component is quickly closed to realize reliable grounding of the main busbar.

The invention realizes the connection with the external gas insulated switchgear cabinet by sealing the busbar bushing installed in the metal casing, and the model specification of the busbar bushing can be replaced, and meets the switchgear with different voltage and current levels. The splicing of the busbar; the grounding component is fixedly connected to the busbar bushing through the main busbar, and is movably connected with the arm arm and installed inside the venting compartment; the operating mechanism is installed outside the venting compartment, and is sealedly connected with the driving spindle, and can be grounded. The component is quickly grounded and grounded to achieve the busbar grounding function of the present invention. The pressure relief device is arranged at the top or bottom of the gas-filled compartment, and the high-pressure gas in the gas-filled compartment is discharged to the lower pressure relief passage under the fault condition to ensure the safety of personnel operation; the metal casing is provided with a self-sealing valve, which can be filled with high performance. Insulating gas to achieve gas insulation and environmental isolation of the grounding device.

The high-voltage components of the gas insulated busbar grounding device of the present invention are all sealed and installed in the air-filled compartment, including a busbar bushing installed inside the metal casing through a flange, and the grounding component is fixedly mounted through the main busbar connecting the busbar bushing, the grounding component The contact tube is movably connected with the moving rod sliding in the arm, and the driving main shaft body is inserted into the inner hole of the driving arm and can rotate synchronously with the arm. The guiding rod is inserted into the inner hole of the contact unit of the grounding component and vertically mounted on the bracket. The upper part is used for guiding the contact tube of the grounding component, and the bracket is fixedly mounted by the support member and the metal shell to ensure the installation strength of the guide rod.

The grounding component of the invention comprises a circular tubular insulating cylinder for insulation and support, the two ends of the insulating cylinder are provided with threads, the static contact and the contact seat are installed at two ends of the insulating cylinder, wherein the static contact is provided with a ventilation hole, The gas exchange of the arc extinguishing medium of the grounding component; the inner hole of the contact seat is provided with a finger and a sealing ring, and the contact pipe is inserted into the insulating cylinder through the inner hole of the contact seat, and the contact hole of the inner hole of the contact seat is passed through the sealing ring. The gas dynamic seal; the main body of the contact pipe has a circular tubular structure, and the upper end connected to the movable contact is provided with a radial through hole, and the radial through hole communicates with the central through hole in the screw of the fixed moving contact; the lower end of the contact pipe is provided with The sealing ring cooperates with a guide rod that is worn in the inner hole of the contact tube for realizing the motion guiding and the gas dynamic sealing; the moving contact is fixedly connected with the contact tube through the screw, and the guiding ring for guiding the moving contact is fixedly mounted, wherein The center of the screw is set as a through hole for gas communication; the outer ring of the guide ring is provided with a sealing groove for installing a sealing ring to realize motion guiding and gas dynamic sealing; the sealing pipe of the contact pipe, the guiding ring and the contact seat and the insulating cylinder can be In the shape of the insulation cylinder The sealing space, when the contact pipe moves rapidly from the opening position to the closing position, can form a negative pressure in the sealed space to form a gas flow, which can cool the pre-breaking arc during the closing process of the contact, and reduce the burning of the contact Degree of damage The busbar is disposed at the lower end of the grounding device, and is fixedly mounted by the nut and the contact seat to realize short circuit between the phases for carrying short-circuit current; the shield cover is disposed at the upper end of the grounding device, outside the insulating cylinder, and is fixedly mounted with the static contact for high voltage The electric field shielding of the side static contact can improve the electric field strength of the high voltage side of the grounding component by adjusting the outer dimensions of the shielding cover without changing the main structure of the grounding component, and realize the application of the grounding switch device with different voltage levels; The lower end of the tube is provided with a mounting hole for connecting with the moving rod in the arm, and receiving the output torque of the mechanism, so that the moving contact on the contact tube moves up and down in the grounding device to complete the opening and closing operation of the grounding device.

The invention completely designs the main busbar grounding device, adopts metal sealing, gas sealing and directional pressure relief structure. The grounding device is sealed and installed in a separate metal gas chamber, which can be filled with insulating gas to achieve gas insulation. A special pressure relief device and a pressure relief channel are provided, and the safety of use is greatly improved; the main bus grounding device adopts a direct motion mode, and the coaxial electric field design Structure, improve the insulation capacity of the fracture, meet the use of high-voltage grade gas-insulated switchgear; the grounding component and the busbar connection device are installed in the sealed metal casing, and the busbar connection device can be replaced to meet the main busbar grounding function of the gas insulated switchgear with different specifications. The grounding device is provided with arc-proof material at the end of the moving and stationary contacts, and the airflow field is designed at the contact position of the contact. The pre-breakdown current can be cooled by the airflow field to reduce the burning of the moving and static contacts, and the busbar grounding device is realized. Maintenance free design.

DRAWINGS

Figure 1 is a schematic view showing the structure of the present invention.

Figure 2 is a side view of the invention.

Figure 3 is a schematic view showing the structure of the grounding assembly of the present invention.

Figure 4 is a schematic diagram of the action relationship of the present invention.

detailed description

The technical means of the present invention, the creative features, the achievement of the purpose and the effect are easy to understand, and the following description is further described in conjunction with the drawings (Fig. 1, Fig. 2, Fig. 3, Fig. 4):

A gas insulated busbar grounding device of the present invention can be realized by a structure including a metal casing 40, a pressure relief passage 13, a pressure relief device 12, a busbar casing 1, a main busbar 7, a driving mechanism 15, and a gas Insulated busbar grounding assembly.

The inflatable compartment 11 is a sealed space composed of a metal casing 40, a busbar casing 1, a flange 2, a pressure relief device 12 and an inflation joint 14, and the inflation compartment 11 can be filled with an insulating gas; The chamber body 30 includes an inflation compartment 11 and a pressure relief passage 13 , the grounding assembly 3 is disposed inside the inflation compartment 11 , the pressure relief passage 13 is located at a lower portion of the inflation compartment 11 , and the pressure relief passage 13 and the inflation compartment 11 are disposed between The pressure relief device 12 is provided with an inflation joint on the inflation compartment 11, and a self-sealing valve 14 is mounted on the inflation joint, and the inflation chamber 11 can be filled with an insulating gas through the self-sealing valve 14.

The busbar bushings 1 are six and are divided into three groups, each set being relatively opposed. Each busbar sleeve 1 can be mounted on the two side plates of the gas-filled compartment 11 (ie, the side walls of the metal casing 40) through the flange 2, and the main busbars are electrically connected through the three main busbars 7, respectively, through the busbar sleeves. The tube 1 realizes the connection of the bus grounding device of the present invention to the main busbar of the external switchgear.

The grounding assembly includes a stationary contact 16, a movable contact 18, a contact tube 26, an insulation barrel 20, and a contact seat 21, and the movable contact 18 is fixed on the top end of the contact tube 26 and electrically connected to the contact tube 26. Connecting, the upper end of the insulating barrel 20 is fixedly connected to the static contact 16, for example, the static contact 16 is screwed to the upper end of the insulating barrel 20; the lower end of the insulating barrel 20 and the contact 21 a fixed connection, for example, a threaded connection to the lower end of the insulation barrel 20; the insulation barrel 20 has an inner hole therein, and the contact seat 21 has a center hole coaxial with the inner hole of the insulation barrel 20, the contact a tube 26 is inserted into an inner hole of the insulating barrel 20 through a center hole of the contact seat 21, and the contact seat 21 passes through a contact finger 27 provided on a wall of a center hole of the contact seat 21 The contact tube 26 is electrically connected, and the insulation and support of the ground fracture is realized by the insulation barrel 20. When the grounding is closed, the contact pipe 26 moves upward to bring the movable contact 18 into contact with the static contact 16. When the grounding is opened, the contact pipe 26 moves downward to drive the movable contact 18 and the ground. The stationary contacts 16 are separated.

A guide ring 19 is further disposed on the contact tube 26, and an outer peripheral edge of the guide ring 19 is sealingly abutted against an inner hole wall of the insulating cylinder 20, and between the guide ring 19 and the contact seat 21 The inner hole of the portion of the insulating cylinder 20 forms a pressure space, and the space of the inner hole of the portion of the insulating cylinder 20 between the guiding ring 19 and the static contact 16 is an upper space, and the pressure space is outside the insulating cylinder 20 An arc extinguishing air passage is disposed between the insulating gases. When the grounding component is closed, the insulating gas outside the insulating cylinder 20 passes through a single arc extinguishing air passage, and the driven contact 18 flows to the pressure space. The flow of the arc extinguishing gas is generated between the head 18 and the stationary contact 16.

Specifically, referring to FIG. 1 , FIG. 3 and FIG. 4 , the static contact 16 and the movable contact 18 are located in the upper space, and the static contact 16 is provided with a ventilation hole 32 , so that the upper space and the outer portion of the insulating tube 20 are The insulating gas is connected, and when the grounding component is grounded, the flow of the arc extinguishing airflow is formed at the contact portion of the static contact 16 and the movable contact 18, and the flow of the arc extinguishing gas is generated between the moving contact 18 and the static contact 16. .

The grounding assembly further includes a shield cover 17 disposed outside the stationary contact 16 side of the insulating cylinder 20 for electrically shielding the high voltage portion of the grounding assembly 3, the shield cover 17 covering the stationary contact 16 and the insulating cylinder In the periphery of the upper part of the upper part of the 20, the electric field strength of the high-voltage side of the grounding component 3 can be adjusted by controlling the outer circle size of the shield cover 17, so as to meet the insulation requirements of the grounding components of different voltage levels.

The grounding assembly includes a shorting busbar 22 fixed to the contact base 21 and electrically connected to the contact seat 21, the shorting busbar 22 and the inflatable compartment 11 The side panel electrical connections are used to ground the grounding components. When the grounding device is closed, the current is sequentially transmitted to the busbar bushing 1, the main busbar 7, the stationary contact 16, the movable contact 18, the contact pipe 26, the contact finger 27, the contact seat 21, and the short through the bus bar outside the switch cabinet. The metal casing 40 is transferred to the busbar 22 to achieve grounding protection.

The movable contact 18 is fixedly electrically connected to the contact tube 26 through a connecting member. It can be understood that the connecting member functions to fix and electrically connect the movable contact 18 and the contact tube 26, and therefore, the connection The structure of the piece is not limited and may be a screw, a bolt, or other fixed structure. For example, the movable contact 18 is fixedly connected to the contact pipe 26 by the screw 24; the contact hole of the center hole of the contact seat 21 is provided with a contact finger 27, when the contact pipe 26 moves up and down, the surface of the contact pipe 26 is always in sliding electrical contact with the contact finger 27, so that the movable connection of the contact pipe 26 and the contact seat 21 can be realized; the contact pipe 26 can be connected by the moving rod 8, With the rotation of the arm 9 in the vertical direction of the guide rod 4, the up-and-down motion is realized as shown in FIG. 4 (the driving mechanism in FIG. 4 is a simplified diagram), and the joint action of the grounding component 3 is realized, and the main busbar of the switch cabinet is completed. The grounding function is provided; the shorting busbar 22 is disposed on the contact 21 side of the grounding component 3, and the phase-to-phase shorting of the grounding component 3 is realized by the nut 23, and is fixedly connected with the inflatable compartment 11 to realize short-circuiting of the three-phase of the power system. And balance the system three-phase unbalanced current.

A first sealing ring 25 can be disposed on the guiding ring 19, and a second sealing ring 28 can be disposed on the contact seat 21. A third sealing ring 29 can be disposed on the contact tube 26, through the guiding ring 19, the guiding rod 4, the contact tube 26, and the contact The seat 21 and the insulating cylinder 20 can form a pressure space A in the grounding component 3; the static contact 16 is provided with a ventilation hole 32, and the upper space passes through the ventilation hole 32 and the insulating gas outside the insulating cylinder 20 (ie, the inflatable compartment) The insulating gas in 11 is connected to prevent the upward movement of the contact pipe 26 (if the ventilation hole 32 is not provided, when the contact pipe 26 moves upward, the gas in the upper space is continuously compressed, and the pressure gradually increases, and the contact The movement of the tube 26 creates a resistance). The outer circumference of the contact pipe 26 is provided with more than one radial through hole 31. The radial through hole 31 is still in the pressure space A when the grounding assembly 3 is in the opening position; the moving contact 18 is a self-type contact. When the movable contact 18 and the static contact 16 are grounded and closed, there is a certain gap between the movable contact 18 and the static contact 16 so that the arc extinguishing air flows through the movable contact. A contact portion between the 18 and the stationary contact 16 defines a central through hole, and the central through hole on the connecting member communicates with the radial through hole 31 on the contact pipe 26, so that the pressure space A can only pass through The radial through hole 31 of the tube 26, the central through hole 33 of the connector (such as the screw 24), and the notch of the movable contact 18 and the ventilation hole 32 communicate with the insulating gas in the inflation chamber 11. Referring to FIG. 4, when the grounding component 3 is in the opening position, the movable contact 18 is located below the insulating cylinder 20, and the pressure space A is small in volume. When the operating grounding device is closed and grounded, the contactor 26 is biased by the arm 9 and The driving of the moving rod 8 rapidly drives the movable contact 18 to move to the stationary contact 16, and the volume in the pressure space A rapidly increases to form a negative pressure, and therefore, the inflatable compartment 11 The insulating medium (ie, the insulating gas) passes through the only arc extinguishing air passage, and the driven contact 18 flows to the pressure space A to generate a flow of the arc extinguishing gas between the moving contact 18 and the stationary contact 16. During the grounding closing and closing operation, when the fracture distance is reduced to the insulation breakdown, the pre-breakdown is closed, and the flowing insulating gas generated between the moving contact 18 and the static contact 16 can cool the pre-breakdown. The arc reduces the arc ablation of the moving and stationary contacts 16 to achieve the maintenance-free operation of the gas insulated busbar grounding device.

The grounding component 3 is fixedly connected to the main busbar 7, and the grounding component 3 is movably connected to the moving rod 8 through the contact pipe 26, and the moving rod 8 is put into the inner hole of the rotating arm 9, and the grounding component 3 is driven by the rotation of the rotating arm 9. The contact pipe 26 moves up and down to realize the grounding closing and grounding opening action of the grounding component 3; the guiding rod 4 is worn in the inner hole of the contact pipe 26, and the lower part of the guiding rod 4 is fixed to the inflatable compartment through the supporting plate 5 and the supporting base 6 The side plate of the chamber 11 (ie, the side wall of the metal casing 40) is used for the action guiding of the contact pipe 26; the pressure relief device 12 can collect the internal arc fault gas through the pressure relief passage 13; the main shaft 10 is sealed at one end and installed in the air. The inside of the compartment 11 is fixedly connected to the arm 9 and is freely rotatable. The other end of the main shaft 10 is disposed outside the inflation compartment 11 and can be connected to the operating mechanism 15 to realize the transmission of the mechanism energy.

The embodiment of the invention further provides a gas insulated switchgear, the switchgear has a main busbar, and the switchgear comprises any one of the above grounding devices, and the main busbar 7 is correspondingly connected with the busbar bushing 1.

The basic principles, main features and advantages of the present invention have been described above. It should be understood by those skilled in the art that the present invention is not limited by the foregoing embodiments, and that the present invention is described in the foregoing description and the description of the present invention. Such changes and modifications are intended to fall within the scope of the invention as claimed. The protection scope of the invention is defined by the appended claims and their equivalents.

Claims

A gas insulated busbar grounding component, characterized in that: the grounding component comprises a static contact, a movable contact, a contact pipe, an insulation cylinder and a contact seat, and the movable contact is fixed on the top end of the contact pipe and The upper end of the insulating tube is fixedly connected to the static contact, the lower end of the insulating tube is fixedly connected to the contact seat, and the insulating tube has an inner hole therein, and the contact seat has a central hole coaxial with the inner hole of the insulating barrel, the contact tube being inserted into the inner hole of the insulating barrel through a center hole of the contact seat, the contact seat being disposed at the contact seat The contact finger on the wall of the central hole is electrically connected to the contact pipe; when the grounding is closed, the contact pipe moves upward to bring the movable contact into contact with the static contact, and when the ground is opened, the contact pipe The downward movement causes the movable contact to be separated from the stationary contact.
The grounding assembly of claim 1 , wherein a guide ring is further mounted on the contact tube, and an outer circumference of the guide ring is sealingly abutted against an inner hole wall of the insulation tube, and the guide ring is The portion of the inner bore of the insulating cylinder between the contacts forms a pressure space, and the arc space is disposed between the pressure space and the insulating gas outside the insulating cylinder. When the grounding component is grounded and closed, The insulating gas outside the insulating cylinder passes through a single arc extinguishing air passage, and the driven contact flows to the pressure space to generate a flow of the arc extinguishing gas between the moving contact and the stationary contact.
The grounding assembly of claim 2, wherein the static contact is provided with a ventilation hole, and a space formed by the inner hole of the portion of the insulating cylinder between the guide ring and the stationary contact passes through The venting hole is in communication with an insulating gas outside the insulating cylinder.
The grounding assembly of claim 2, wherein the contact tube is provided with at least one radial through hole; the movable contact is fixedly electrically connected to the contact tube through a connecting member, the connection A central through hole is defined in the piece, and a central through hole on the connecting member communicates with a radial through hole on the contact pipe, and a radial through hole on the contact pipe communicates with the pressure space.
The grounding assembly of claim 4 wherein said connector is a screw.
The grounding assembly of claim 1, wherein the movable contact is a self-acting contact, and the notch is opened between the fingers.
The grounding assembly of claim 1 wherein said grounding assembly further comprises a shield, said shield being disposed on said periphery of said stationary contact and said upper portion of said insulating cylinder.
The grounding assembly of claim 1 wherein said grounding assembly includes a shorting busbar, said shorting busbar being secured to said contact and electrically coupled to said contact.
The grounding assembly of claim 1 wherein said grounding assembly further comprises a guide rod, said inner bore of said contact tube being overlying said guide rod, said contact tube moving up and down along said guide rod.
A gas insulated busbar quick-grounding device, characterized in that the grounding device comprises the grounding component according to any one of claims 1-9, and further comprising:

An inflatable compartment body, the inflatable compartment body comprising an inflation compartment, on which an inflation joint is disposed, and a self-sealing valve is mounted on the inflation joint;

Six busbar bushings mounted on opposite side plates of the inflatable compartment; each of the two busbar bushings is a phase, oppositely disposed;

a three-phase main busbar located in the air-filled compartment, each phase of the main busbar is installed between two busbar bushings of the corresponding phase, and each phase of the main busbar passes through the two busbar bushings of the phase and the external switchgear main Busbar connection;

The grounding component is a three-phase grounding component, and an upper end of each phase grounding component is connected to a main busbar of a corresponding phase;
The grounding device according to claim 10, wherein said grounding means comprises a driving mechanism for driving a three-phase grounding assembly for grounding and grounding, said driving mechanism comprising: an operating mechanism, a main shaft and a crank arm The operating mechanism is installed outside the air-filled compartment, the main shaft is driven to rotate by the operating mechanism, the main shaft is inserted into the air-filled compartment, the arm is mounted on the main shaft, and the main shaft is synchronously driven The arm rotates, and the arm is hinged to the contact tube through a moving rod, and the arm moves the corresponding contact tube up and down by the moving rod.
The grounding device according to claim 11, wherein said inflation compartment comprises a pressure relief device, said pressure relief device being disposed between the pressure relief passage and the inflation compartment, said pressure relief device being disposed in said The top or bottom of the inflatable compartment.
A gas insulated busbar quick grounding device, characterized by comprising:

An inflatable compartment body, the inflatable compartment body including an inflation compartment and a pressure relief passage, a pressure relief device disposed between the pressure relief passage and the inflation compartment, and an inflation device disposed on the inflation compartment Joint

Six busbar bushings mounted on opposite side plates of the inflatable compartment; each of the two busbar bushings is a phase, oppositely disposed;

a three-phase main busbar located in the air-filled compartment, each phase of the main busbar is installed between two busbar bushings of the corresponding phase, and each phase of the main busbar passes through the two busbar bushings of the phase and the external switchgear main Busbar connection;

a three-phase grounding assembly located in the air-filled compartment, the upper end of each phase-grounding component is connected to the main busbar of the corresponding phase, and the lower end of the guiding rod in each phase-cored component is supported on one side of the inflatable compartment Board connection

A drive mechanism that drives a three-phase grounding assembly to achieve grounding and grounding tripping.
A gas insulated busbar quick-grounding device according to claim 13, wherein a self-sealing valve is mounted on said inflation joint.
The gas insulated busbar quick-grounding device of claim 13 wherein each phase-to-phase component further comprises:

a static contact fixedly connected to the main busbar;

An insulating cylinder fixedly connected to the static contact at the upper end, the insulating cylinder has an inner hole therein;

a contact seat fixed to a lower end of the insulation barrel, the contact seat having a center hole coaxial with an inner hole of the insulation barrel, and a middle upper portion of the guide rod is inserted into a center hole of the contact seat In the inner bore of the insulating cylinder;

a contact tube having an inner hole for being sleeved on the guide rod, an inner hole of the contact tube is sleeved on the guide rod; the contact tube also passes through the contact seat a central hole inserted into the inner hole of the insulating cylinder The contact seat is electrically connected to the contact tube through a contact finger disposed on a wall of the central hole of the contact seat; the contact tube is drivingly connected with the driving mechanism, and the driving mechanism drives the edge The guide rod moves up and down;

a movable contact fixed to the top end of the contact pipe and electrically connected to the contact pipe, when the grounding is closed, the contact pipe moves upward to bring the movable contact into contact with the static contact, and when the ground is opened, the ground contact The downward movement of the contact pipe drives the movable contact to be separated from the static contact;

A shorting busbar fixed to the contact and electrically connected to the contact, the shorting busbar being electrically connected to a side panel of the inflatable compartment.
A gas insulated busbar quick-grounding device according to claim 15, wherein a shield cover is disposed on the stationary contact, and the shield covers the periphery of the upper portion of the stationary contact and the insulating cylinder.
The gas insulated busbar quick-grounding device according to claim 16, wherein a guide ring is further mounted on the contact pipe, and an outer peripheral edge of the guide ring is in sliding contact with an inner hole wall of the insulating cylinder.
The gas insulated busbar quick-grounding device according to claim 17, wherein a first sealing ring is disposed on an outer circumference of the guiding ring, and the first sealing ring is used for sealing an outer circumference of the guiding ring. a contact gap between the inner wall of the insulating cylinder.
A gas insulated busbar quick-grounding device according to claim 18, wherein a second sealing ring is disposed on a hole wall of the center hole of the contact seat, and the second sealing ring is for sealing the contact seat. The contact gap between the hole wall of the center hole and the outer peripheral wall of the contact pipe.
The gas insulated busbar quick-grounding device according to claim 19, wherein a third sealing ring is disposed on the hole wall of the inner hole of the contact pipe, and the third sealing ring is used for sealing the contact pipe a gap between the inner hole and the outer peripheral surface of the guide rod.
The gas insulated busbar quick-grounding device according to claim 20, wherein the movable contact is mounted on the contact pipe by a screw, and a central through hole is formed in the screw. At least one or more radial through holes are formed in the contact tube, and a central through hole on the screw communicates with a radial through hole on the contact tube; the portion between the guide ring and the contact base The inner hole of the insulating cylinder constitutes a pressure space, and the radial through hole on the contact pipe communicates with the pressure space; a ventilation hole is arranged on the static contact.
The gas insulated busbar quick-grounding device according to claim 21, wherein the movable contact is a self-acting contact, and a notch of a certain distance is opened between the fingers.
A gas insulated busbar quick-grounding device according to claim 22, wherein said pressure relief device is disposed at the top or bottom of said inflatable compartment.
The gas insulated busbar quick grounding device according to any one of claims 13 to 23, wherein the driving mechanism comprises:

An operating mechanism installed outside the inflatable compartment;

a spindle driven by the operating mechanism, the spindle being inserted into the inflation compartment;

Three arms are mounted on the main shaft at an axial interval of the main shaft, and the main shaft synchronously drives three arm rotations, and each of the armes is hinged to the contact cylinder through a moving rod, and each of the arm passes The moving rod drives the corresponding contact cylinder to move up and down.
A gas insulated switchgear, comprising: a main busbar, wherein the gas insulated switchgear comprises the gas insulated busbar quick grounding device according to any one of claims 10-12 or 13-24 A gas insulated busbar quick grounding device, the main busbar being connected to the busbar bushing.