CN114709102A - GIS double-break isolating switch - Google Patents

Abstract

A GIS double-break isolating switch comprises a shell, an operating mechanism and a driving mechanism, wherein a sealed cavity is formed inside the shell, an isolating device is arranged in the sealed cavity and comprises an auxiliary movable contact base, a driving contact base, an isolating static contact base and a movable contact component, the isolating device is provided with a first isolating break and a second isolating break, the movable contact component comprises an insulating pull rod, a driving contact and an auxiliary movable contact, and when the movable contact component moves forwards or backwards along a straight line, the driving contact and the auxiliary movable contact synchronously act to enable the first isolating break and the second isolating break to be switched on or off; the sealing cavity is provided with a grounding device, the grounding device comprises a grounding moving contact and a grounding static contact seat, the grounding static contact seat is correspondingly arranged on a driving contact seat, and one end of the sealing cavity is provided with an expansion port. The isolation device has the insulation guarantee of the two isolation fractures, and the grounding device can realize the reliable grounding during the uninterrupted butting and the bus extension.

Description

GIS double-break isolating switch

Technical Field

The invention relates to the field of high-voltage electrical equipment, in particular to a GIS double-break isolating switch.

Background

Gas insulated metal enclosed switchgear (GIS) has been widely used in power grid construction because of its advantages of small floor space, low operation failure rate, high reliability, and no maintenance. In a conventional GIS device, a common isolating switch is only provided with one isolating fracture, and the voltage rise and the air pressure drop of the isolating switch fracture caused by an alternating-current withstand voltage test can cause the single fracture insulation breakdown of the isolating switch. Therefore, when GIS spare interval extension and handover withstand voltage test are carried out, the original operation bus needs to be powered off, personal injury caused by breakdown discharge of the isolation fracture during installation and butt joint is avoided, and meanwhile, the occurrence of discharge breakdown safety accidents caused by reverse overvoltage superposition at two ends of the isolation fracture during handover test can be prevented. Meanwhile, the load of the power grid is continuously increased, so that the extension projects of the GIS equipment are gradually increased, and the early-stage operation of the GIS equipment is realized, so that the maintenance period of the equipment is reached. At present, a GIS device which is maintained and expanded under the condition of no power failure is urgently needed. For the above reasons, the single-break disconnecting switch cannot meet the requirements of uninterrupted extension and maintenance in the market. At present, a GIS double-break isolating switch with a voltage grade below 145kV and GIS below is blank, and relevant double-break isolating switch equipment with a voltage grade below 145kV does not exist in the market. The existing double-fracture isolating switch is not applicable to a GIS (gas insulated switchgear) with a voltage grade below 252kV, and meanwhile, moving and static contacts inside some double-fracture isolating switches are in a single-phase eccentric design, so that the nonuniformity of an electric field is increased due to the eccentric structure design, the fracture breakdown margin is reduced, two fractures are easily broken down simultaneously, and great quality hidden troubles exist.

Therefore, aiming at the requirements and the defects of the prior art, 145kV GIS double-break isolating switch equipment is developed so as to meet the application requirement of a GIS with the voltage class below 145kV, and meanwhile, the defects of the existing double-break isolating switch of the GIS with the voltage class of 252kV are optimized and improved.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provide the GIS double-fracture isolating switch which has better insulating property, can realize reliable grounding under the condition of no power failure and is suitable for voltage grades of 145kV and below 145 kV.

In order to achieve the purpose, the invention adopts the following technical scheme:

a GIS double-break isolating switch comprises a shell and an operating mechanism arranged on one side of the shell, wherein a sealed cavity is formed inside the shell, at least one isolating device driven by the operating mechanism is arranged in the sealed cavity, each isolating device is connected with a phase bus, each isolating device comprises an auxiliary movable contact seat, an active contact seat and an isolating static contact seat which are sequentially arranged at intervals along a straight line, and a movable contact assembly in driving fit with the operating mechanism, the interval between the isolating static contact seat and the active contact seat is a first isolating break, the interval between the active contact seat and the auxiliary movable contact seat is a second isolating break, the movable contact assembly comprises an insulating pull rod, and an active contact and an auxiliary movable contact which are connected to the two ends of the insulating pull rod, the operating mechanism drives the movable contact assembly to move forwards or backwards along the straight line, and the active contact, the auxiliary movable contact and the operating mechanism drive the movable contact assembly to move forwards or backwards along the straight line, The auxiliary moving contact synchronously acts to enable the first isolation fracture and the second isolation fracture to be switched on or off;

at least one grounding device is connected to one side of the sealed chamber in a penetrating manner, each grounding device comprises a grounding movable contact and a grounding static contact seat, the grounding static contact seats are correspondingly arranged on one driving contact seat, and the grounding movable contacts are driven by a driving mechanism arranged outside the shell to enable the grounding movable contacts to be matched with the grounding static contact seats;

one end of the sealed cavity is also provided with an expansion port, and the expansion port is used for assembling an adsorbent device or overhauling a grounding switch.

Preferably, three parallel isolating devices are arranged in the sealed chamber, three moving contact assemblies are driven by the same operating mechanism to perform linear motion, three grounding devices are arranged on one side of the sealed chamber in parallel, and three grounding moving contacts are driven by the same driving mechanism.

Preferably, the operating mechanism comprises a driving shaft, the driving shaft penetrates through the sealed cavity, and the driving shaft drives the moving contact assembly to perform linear motion through driving matching with the auxiliary moving contact.

Preferably, the auxiliary moving contact seat is provided with a driving gear driven by the driving shaft, the auxiliary moving contact is provided with a rack, and all moving contact components perform linear motion in the sealing cavity under the matching of the respective driving gear and the rack.

Preferably, the active contact seat comprises first conductive seats, each first conductive seat is fixed in the sealed cavity through a supporting insulator, each first conductive seat is provided with a first hollow cavity, the middle part of each first hollow cavity is provided with a guide sleeve, and two ends of each first hollow cavity are respectively provided with a conductive contact finger.

Preferably, one side of the first conductive seat, which is back to the support insulator, is provided with a grounding static contact seat, and the grounding movable contact is in plug-in fit with the grounding static contact seat along the direction perpendicular to the central axis of the first hollow cavity.

Preferably, the auxiliary movable contact base comprises a supporting conductor and a second conductive base, one end of the supporting conductor is fixedly connected with the outer shell, the second conductive base is fixedly connected with the other end of the supporting conductor, a second hollow cavity and a driving groove are arranged on the second conductive base, a guide sleeve is arranged in the middle of the second hollow cavity, a conductive contact finger is arranged at one end, close to the first isolation fracture, of the second hollow cavity, the driving groove is communicated with the second hollow cavity, the driving groove is perpendicular to the central axis of the second hollow cavity, and a driving gear is arranged in the driving groove.

Preferably, keep apart stationary contact seat including being fixed in the interior isolation quiet side conductor of sealed cavity, the both ends of keeping apart quiet side conductor are equipped with the generating line extension conductor that can be connected with same looks generating line, and the one end of keeping apart quiet side conductor and being close to first isolation fracture is equipped with electrically conductive chamber electrically conductive intracavity is equipped with and electrically conducts and touches finger and striking contact, and the initiative contact is with to electrically conduct to touch finger and striking contact grafting cooperation.

Preferably, the sealed chamber comprises at least six flange ports capable of being sealed, a first flange port and a second flange port are respectively arranged at two opposite ends of the sealed chamber, a third flange port, a fourth flange port, a fifth flange port and a sixth flange port are arranged on the side wall of the shell between the first flange port and the second flange port, the third flange port and the fourth flange port are oppositely arranged at one side close to the first flange port, and the fifth flange port and the sixth flange port are oppositely arranged at one side close to the second flange port; all auxiliary moving contact seats are supported and fixed at the first flange port in parallel, the second flange port serves as an expansion port, all grounding devices are arranged at the third flange port in parallel, all grounding moving contacts penetrate through the third flange port and extend into the sealed cavity, all driving contact seats are fixedly supported at the fourth flange port in parallel, all grounding static contact seats are located on one side, facing the third flange port, of the driving contact seats, all isolation static contact seats are supported at the fifth flange port and the sixth flange port in parallel, and each isolation static contact seat is connected with a bus extension conductor which can be connected to the same phase bus respectively.

Preferably, the length of the insulating pull rod is greater than or equal to that of the second isolation fracture, the insulating pull rod is formed by pouring epoxy resin, inserts are arranged at two ends of the insulating pull rod, and the two inserts are respectively embedded in the auxiliary moving contact and the active contact in a concave mode.

According to the GIS double-break isolating switch, the isolating device arranged in the sealed cavity is provided with the two isolating fractures, the first isolating fracture can ensure that the driving contact and the isolating static contact seat are separated from the neutral power, the second isolating fracture can avoid providing a second insulation guarantee under the condition that the first isolating fracture is subjected to insulation breakdown, the grounding device can ensure that reliable grounding is realized during non-power-off butt joint or bus extension, and the safety of field personnel is ensured.

Drawings

FIG. 1 is a schematic structural diagram of the present invention during opening;

FIG. 2 is a schematic structural diagram of the present invention during opening;

FIG. 3 is a schematic view of the direction K in FIG. 1;

FIG. 4 is a schematic view of the N-N direction of FIG. 1;

FIG. 5 is a schematic structural diagram of the moving contact assembly, the first conductive socket and the second conductive socket of the present invention (when opening the switch);

FIG. 6 is a schematic structural diagram of a GIS double-break isolating switch according to the present invention (during closing);

FIG. 7 is a schematic view of the M-M orientation of FIG. 6;

FIG. 8 is a schematic structural view of the moving contact assembly, the first conductive socket and the second conductive socket of the present invention (when closing);

FIG. 9 is a schematic diagram of a first conductive socket of the present invention;

FIG. 10 is a schematic view of the isolated stationary contact of the present invention;

FIG. 11 is a schematic view of the construction of the moving contact assembly of the present invention;

fig. 12 is a schematic view of the structure of the insulated rod of the present invention.

Detailed Description

The following further describes a specific embodiment of the GIS dual-break disconnector according to the present invention with reference to the embodiments shown in fig. 1 to 12. A GIS double break disconnector of the present invention is not limited to the description of the following embodiments.

A GIS double-break isolating switch comprises a shell 1 and an operating mechanism 5 arranged on one side of the shell 1, wherein a sealed cavity 11 is formed in the shell 1, at least one isolating device driven by the operating mechanism 5 is arranged in the sealed cavity 11, each isolating device is connected with a phase bus, the isolating device comprises an auxiliary moving contact seat 22, a driving contact seat 21 and an isolating static contact seat 23 which are sequentially arranged along a straight line at intervals, and a moving contact component in driving fit with the operating mechanism 5, the interval between the isolating static contact seat 23 and the driving contact seat 21 is a first isolating break I, the interval between the driving contact seat 21 and the auxiliary moving contact seat 22 is a second isolating break II, the moving contact component comprises an insulating pull rod 33, a driving contact 31 and an auxiliary moving contact 32 which are connected with two ends of the insulating pull rod 33, and the moving contact component is driven by the operating mechanism 5 to move forwards or backwards along the straight line, the active contact 31 and the auxiliary moving contact 32 act synchronously to enable the first isolation fracture I and the second isolation fracture II to be switched on or switched off;

at least one grounding device is further connected to one side of the sealed chamber 11 in a penetrating manner, each grounding device comprises a grounding moving contact 42 and a grounding static contact 41, the grounding static contact 41 is correspondingly arranged on one active contact 21, the grounding moving contact 42 is driven by a driving mechanism 6 arranged outside the housing 1, and the grounding moving contact 42 is matched with the grounding static contact 41;

one end of the sealed cavity is also provided with an expansion port, and the expansion port is used for assembling the adsorbent device 9 or repairing the grounding switch.

According to the GIS double-break isolating switch, the isolating device arranged in the sealed cavity 11 is provided with two isolating fractures, the first isolating fracture I can ensure that the active contact 31 and the isolating static contact seat 23 are separated from each other without electricity, the second isolating fracture II can avoid providing a second insulating guarantee under the condition of insulation breakdown of the first isolating fracture I, the grounding device can ensure reliable grounding during uninterrupted butting or bus extension, and the safety of field personnel is ensured.

An embodiment is provided in conjunction with fig. 1-12, and the disconnector of this embodiment is suitable for use in voltage levels of 145kV and below 145 kV.

The isolating switch comprises a shell 1, wherein the shell 1 is of a sealed hollow barrel-shaped structure as a whole, and a sealed cavity 11 which can be filled with insulating arc extinguishing gas is formed inside the shell 1. The housing 1 is provided with six sealable flange ports, namely, a first flange port and a second flange port which are respectively positioned at two ends of the housing 1, wherein the first flange port is positioned at the left end of the sealed chamber 11 in figures 1, 2 and 6, the second flange port is positioned at the right end of the sealed chamber 11, the side wall of the housing 1 between the first flange port and the second flange port is provided with a third flange port, a fourth flange port, a fifth flange port and a sixth flange port, wherein the third flange port and the fourth flange port are oppositely arranged at one side close to the first flange port, namely, the third flange port is positioned at the upper left part of the sealed chamber 11 in figures 1, 2 and 6, the fourth flange port is positioned at the lower left part of the sealed chamber 11 in figures 1, 2 and 6, the fifth flange port and the sixth flange port are oppositely arranged at one side close to the second flange port, and the fifth flange port is positioned at the upper right part of the sealed chamber 11 in figures 1, 2 and 6, the sixth flange port is located in the lower right portion of the sealed chamber 11 in fig. 1, 2 and 6.

In this embodiment, except that the fourth flange opening adopts the waist shape hole, the big or small shape of other flange openings is the same, set up the basin formula insulator of not ventilating on first flange opening, set up supporting insulator 72 at fourth flange opening, all be connected with a looks bus extension conductor 8 on fifth flange opening and sixth flange opening, every isolating device passes through fifth flange opening and sixth flange opening and can be connected with the bus extension conductor 8 on same looks bus and be connected, in this embodiment, fifth flange opening and sixth flange opening all are connected with the bus extension conductor 8 who is connected with the three-phase bus respectively. In addition, still be connected with ground insulator 73 at the third flange mouth, ground insulator 73 passes outside third flange mouth stretches out sealed cavity 11, and ground insulator 73 is equipped with the ground connection copper bar, the one end and the ground connection insulator 73 of ground connection copper bar are connected, and the other end is connected on shell 1.

At least one isolating device is arranged in the sealed cavity 11, in this embodiment, three identical isolating devices are arranged in the sealed cavity 11, the three isolating devices are arranged between the first flange port and the second flange port in parallel, the three isolating devices are driven by the same operating mechanism 5 arranged outside the housing 1, each isolating device is respectively connected with a phase bus, that is, the three isolating devices are respectively connected with the A, B, C phase bus, each isolating device comprises an auxiliary moving contact seat 22, a driving contact seat 21 and an isolating static contact seat 23 which are sequentially arranged at intervals along a straight line, and a moving contact assembly driven by the operating mechanism 5, the interval between the isolating static contact seat 23 and the driving contact seat 21 is a first isolating fracture I, and the interval between the driving contact seat 21 and the auxiliary moving contact seat 22 is a second isolating fracture II, as shown in fig. 1 specifically, 2 and 6, the auxiliary movable contact seats 22 of all the isolating devices are arranged at the first flange port in parallel, the active contact seats 21 of all the isolating devices are arranged at the fourth flange port in parallel, and the isolating fixed contact seats 23 of all the isolating devices are supported and fixed between the fifth flange port and the sixth flange port in parallel; the moving contact component moves linearly under the driving of the operating mechanism 5, the moving contact component comprises an insulating pull rod 33, and a driving contact 31 and an auxiliary moving contact 32 which are connected at two ends of the insulating pull rod 33, the operating mechanism 5 drives the moving contact component, so that the driving contact 31 is matched with the isolated stationary contact seat 23 and the driving contact seat 21 to conduct or break a first isolated fracture I, and the auxiliary moving contact 32 is matched with the driving contact seat 21 and the auxiliary moving contact seat 22 to conduct or break a second isolated fracture II.

As shown in fig. 6 to 8, in this embodiment, the operating mechanism 5 includes a driving shaft 51, a driving gear 223 is provided on each secondary moving contact 22, a rack 321 engaged with the driving gear 223 is provided on the secondary moving contact 32, the driving shaft 51 is penetratingly provided in the sealed chamber 11 to drive all the driving gears 223 to rotate, so that all the moving contact assemblies perform linear motion under the respective driving gears 223 and the rack 321, the driving shaft 51 penetrates the sealed chamber 11 in a direction perpendicular to the secondary moving contact 22, that is, in fig. 7, the moving contact assemblies move in a direction perpendicular to the paper plane, the driving shaft 51 is penetratingly provided in a left-right direction of the paper plane, the moving contact assemblies perform linear motion along the central axes of the first flange and the second flange, in fig. 7 and 8, the driving shaft 51 is provided in segments, and two adjacent driving shafts 51 are connected by a key, each section of the driving shaft 51 connects the driving gears 223 in two adjacent secondary contact seats 22, the driving gear 223 adjacent to the operating mechanism 5 is connected with the output shaft of the operating mechanism 5 through a section of the driving shaft 51, and all parts of the driving shaft 51 exposed to the sealed chamber 11 are coated with an insulating material.

The present embodiment is provided with three grounding devices driven by the same driving mechanism 6, the driving mechanism 6 is located outside the housing 1, the three grounding devices are arranged in parallel on a third flange port, each grounding device includes a grounding moving contact 42 and a grounding stationary contact 41, the grounding stationary contact 41 is correspondingly arranged on one active contact base 21, a grounding fracture III is formed between the grounding moving contact 42 and the grounding stationary contact 41, the driving mechanism 6 drives the grounding moving contact 42 to cooperate with the grounding stationary contact 41 by being hermetically connected with the grounding moving contact 42, so that the grounding fracture III is turned on or off, and the moving direction of the grounding moving contact 42 is perpendicular to the moving direction of the moving contact assembly. In addition, the grounding device is connected with the shell 1 through another grounding copper bar.

In fig. 1, 2 and 6, the expansion port is arranged on the second flange port and used for assembling the adsorbent device 9 or overhauling the grounding switch, so that a user can obtain more choices according to the requirements of a power distribution network, when the adsorbent device 9 is assembled on the expansion port, the moisture, gas or other impurities generated in the operation process can be adsorbed, the gas purity in the sealed space is ensured, the overhauling grounding switch is installed, another grounding structure independent of the grounding device is provided for the isolating switch, the overhauling grounding switch is driven by a special mechanism, the grounding mode is also that the isolating switch is connected with a grounding network through a special grounding copper bar, so that the isolating switch has two grounding structures, and the grounding reliability is further improved.

The specific structure and installation of the isolation device will be described in detail.

As shown in fig. 1, 2, 5, 6, 8 and 9, the driving contact seat 21 includes a first conductive seat 211, the first conductive seat 211 is fixed on the fourth flange opening through a supporting insulator 72, the first conductive seat 211 is a cast conductor, the outer portion of the first conductive seat 211 has two opposite planes, fig. 1, 2, 6 and 9 are an upper plane and a lower plane, the lower plane of the first conductive seat 211 is fixedly connected with the upper end of the supporting insulator 72, a first hollow cavity 212 is arranged inside the first conductive seat 211, the length of the first hollow cavity 212 is greater than the length of the insulating pull rod 33 and the driving contact 31, a guide sleeve 25 is arranged in the middle of the first hollow cavity 212, the guide sleeve 25 is used for cooperating with the driving contact 31 and the insulating pull rod 33 to keep the moving contact assembly moving in a straight line, a conductive contact finger 24 is respectively arranged at two ends of the first hollow cavity 212, namely, a first conductive contact finger 24 is arranged at one end of the first hollow cavity 212 close to the first isolation fracture I, the first conductive contact finger 24 is electrically connected with the active contact 31, a second conductive contact finger 24 is arranged at one end of the first hollow cavity 212 close to the second isolation fracture II, and the second conductive contact finger 24 is electrically connected with the auxiliary movable contact 32. One side of the first conductive seat 211, which is opposite to the support insulator 72, is provided with a grounding stationary contact seat 41, in fig. 1, 2, and 6, the grounding stationary contact seat 41 is arranged on an upper plane of the first conductive seat 211, and the grounding movable contact 42 is in plug-in fit with the grounding stationary contact seat 41 along a direction perpendicular to a central axis of the first hollow cavity 212.

The supporting insulator 72 is poured into a cone shape by epoxy resin, the central axis of the supporting insulator 72 is perpendicular to the central axis of the first hollow cavity 212, the two ends of the supporting insulator 72 are provided with insulator inserts, the insulator inserts are poured integrally with the epoxy resin, the insulator inserts at the thin end of the supporting insulator 72 are fixedly connected with the first conductive seat 211, one end of the insulator insert at the thick end of the supporting insulator 72 is provided with a fixing plate by a bolt, the fixing plate is fixedly arranged on a cover plate of the supporting insulator 72, and the cover plate of the supporting insulator 72 is hermetically assembled with a fourth flange opening of the housing 1.

As shown in fig. 1-3, 5, 6 and 8, the secondary moving contact 22 includes a supporting conductor 224 and a second conductive seat 221, one end of the supporting conductor 224 is fixed to the first flange opening of the housing 1 through an airtight basin insulator, in fig. 1-3 and 6, the supporting conductor 224 is arranged along a direction parallel to the central axis of the first flange opening, the second conductive seat 221 is fixedly connected to the other end of the supporting conductor 224, a second hollow cavity 225 and a driving slot 222 are arranged on the second conductive seat 221, the second hollow cavity 225 is coincident with the central axis of the first hollow cavity 212, a guide sleeve 25 is arranged in the middle of the second hollow cavity 225, the guide sleeve 25 in the first hollow cavity 212 and the second hollow cavity 225 are cooperated to make the moving contact assembly move along a straight line, a conductive contact finger 24 is arranged at one end of the second hollow cavity 225 close to the first isolation break I, in fig. 5 and 8, the conductive contact fingers 24 are disposed at both ends of the second hollow cavity 225, the driving groove 222 is communicated with the second hollow cavity 225, and the driving groove 222 is perpendicular to the central axis of the second hollow cavity 225, a driving gear 223 is disposed in the driving groove 222, in fig. 1, 2, 5, 6 and 8, the driving groove 222 is located below the second hollow cavity 225, and the driving groove 222 is communicated with the second hollow cavity 225, so that the driving gear 223 can extend into the second hollow cavity 225 to be engaged with the rack 321 of the secondary movable contact 32.

As shown in fig. 1, 6 and 10, the isolated stationary contact seat 23 includes an isolated stationary side conductor, the isolated stationary side conductor is a T-shaped casting conductor, the isolated stationary side conductor is connected with a phase bus and is fixed in the sealed chamber 11, wherein the upper end of the isolated stationary side conductor is connected with the bus extension conductor 8 of the fifth flange port, the lower end of the isolated stationary side conductor is connected with the bus extension conductor 8 of the sixth flange port, a conductive cavity 231 is provided at one end of the isolated stationary side conductor close to the first isolated port I, that is, a conductive cavity 231 is provided at the left end of the isolated stationary side conductor, a conductive contact finger 24 and an arcing contact 232 are provided in the conductive cavity 231, wherein the arcing contact 232 is fixedly connected to the middle of the conductive contact finger 24, a mating slot for the arcing contact 232 to plug in is provided at one end of the active contact 31, when the active contact 31 is inserted into the conductive cavity 231, the conductive contact finger 24 is plugged in and mated with the outside of the active contact 31, the ignition contacts 232 are plug-fit with the mating slots. When the bus bar extension conductors 8 of the fifth flange port and the sixth flange port are connected with the same phase bus bar, the isolating switch can be used as a main bus bar at the moment. As part of the busbar, such a disconnector as a busbar is called an active busbar, and such a module on the one hand serves as part of the busbar and on the other hand also provides isolation of the incoming line from the busbar. Compared with the existing isolating switch which is arranged in the interval, the bus is completely free of isolating switch elements, the structure is called as a passive bus, and the function of isolating the bus by the active bus cannot be realized. The utility model provides a be total to case type double fracture isolator arranges on main bus line, can regard as the initiative generating line to use, realizes the generating line isolation function, carries out the electric energy transmission of main bus in the interval.

As shown in fig. 11 and 12, the movable contact assembly includes an insulating pull rod 33, and an active contact 31 and an auxiliary movable contact 32 connected to two ends of the insulating pull rod 33, where an outer diameter of the insulating pull rod 33 is smaller than an inner diameter of the conductive contact finger 24, so that the insulating pull rod 33 does not contact with the conductive contact finger 24, a length of the insulating pull rod 33 is greater than or equal to a length of the second isolation break II, so that the insulating pull rod 33 can stride over the second isolation break II to keep the second isolation break II in an off state, the insulating pull rod 33 is formed by pouring epoxy resin, two inserts 34 are provided at two ends of the insulating pull rod 33, the two inserts 34 are respectively embedded in one ends of the auxiliary movable contact 32 and the active contact 31, and preferably, a groove matched with the insert 34 is provided at one end of the active movable contact 31 and the auxiliary movable contact 32; the main moving contact 31 is formed by fixedly assembling a main contact conductor and a main contact copper-tungsten by bolts, a rack 321 is fixedly arranged at the lower part of the auxiliary moving contact 32, the rack 321 is meshed with a driving gear 223, the driving gear 223 and the rack 321 are matched to drive the moving contact assembly to move forward or backward along a straight line under the driving of the operating mechanism 5, the moving contact assembly moves forward along the closing direction, namely moves rightwards in figures 1, 2 and 6, in the closing state (see figure 6), the main contact 31 is inserted into the isolation fixed contact seat 23, at the moment, the main contact 31 is respectively inserted into the conductive contact finger 24 and the first conductive contact finger 24 in the conductive cavity 231, so that the first isolation fracture I is conducted, meanwhile, the insulation pull rod 33 is positioned in the first hollow cavity 212, the auxiliary moving contact 32 is respectively inserted into the second conductive contact finger 24 and the conductive contact finger 24 of the auxiliary moving contact seat 22, and (3) conducting the second isolation fracture II, wherein in the opening state (see fig. 1 and 2), the active contact 31 is positioned in the first hollow cavity 212 of the active contact base 21, the first isolation fracture I is opened, the auxiliary moving contact 32 is positioned in the second hollow cavity 225 of the auxiliary moving contact base 22, and the insulating pull rod 33 is positioned between the second isolation fractures II, so that the second isolation fracture II is kept fractured.

The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the invention be limited to these specific details. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the spirit of the invention, and all should be considered as belonging to the protection scope of the invention.

Claims (10)

1. A GIS double-break isolating switch comprises a shell (1) and an operating mechanism (5) arranged on one side of the shell (1), wherein a sealed cavity (11) is formed inside the shell (1), and the GIS double-break isolating switch is characterized in that: the device comprises a sealed cavity (11), at least one isolating device driven by an operating mechanism (5) is arranged in the sealed cavity (11), each isolating device is connected with a phase bus and comprises an auxiliary moving contact seat (22), a driving contact seat (21), an isolating static contact seat (23) and a moving contact component in driving fit with the operating mechanism (5), the isolating static contact seat (23) and the driving contact seat (21) are sequentially arranged at intervals along a straight line and are separated into a first isolating fracture (I), the driving contact seat (21) and the auxiliary moving contact seat (22) are separated into a second isolating fracture (II), the moving contact component comprises an insulating pull rod (33), a driving contact (31) and an auxiliary moving contact (32) which are connected to two ends of the insulating pull rod (33), the moving contact component is driven by the operating mechanism (5) to move forwards or backwards along the straight line, and the driving contact (31) and the moving contact (32), The auxiliary moving contact (32) synchronously acts to enable the first isolation fracture (I) and the second isolation fracture (II) to be switched on or off;

at least one grounding device is connected to one side of the sealed chamber (11) in a penetrating manner, each grounding device comprises a grounding moving contact (42) and a grounding static contact seat (41), the grounding static contact seats (41) are correspondingly arranged on one driving contact seat (21), and the grounding moving contacts (42) are driven by a driving mechanism (6) arranged outside the shell (1) to enable the grounding moving contacts (42) to be matched with the grounding static contact seats (41);

one end of the sealed cavity is also provided with an expansion port, and the expansion port is used for assembling an adsorbent device (9) or overhauling a grounding switch.

2. The GIS double-break isolating switch of claim 1, wherein: three parallel isolating devices are arranged in the sealed cavity (11), three moving contact assemblies are driven by the same operating mechanism (5) to move linearly, three grounding devices are arranged on one side of the sealed cavity (11) in parallel, and three grounding moving contacts (42) are driven by the same driving mechanism (6).

3. The GIS double-break isolating switch of claim 1, wherein: the operating mechanism (5) comprises a driving shaft (51), the driving shaft (51) penetrates through the sealed chamber (11), and the driving shaft (51) is in driving fit with the auxiliary moving contact (32) to drive the moving contact assembly to perform linear motion.

4. The GIS double-break isolating switch according to claim 3, characterized in that: the auxiliary moving contact seat (22) is provided with a driving gear (223) driven by a driving shaft (51), the auxiliary moving contact (32) is provided with a rack (321), and all moving contact components perform linear motion in the sealed cavity under the matching of the respective driving gear (223) and the rack (321).

5. The GIS double-break isolating switch of claim 1, wherein: the active contact seat (21) comprises first conductive seats (211), each first conductive seat (211) is fixed in the sealed cavity (11) through a supporting insulator (72), each first conductive seat (211) is provided with a first hollow cavity (212), the middle of each first hollow cavity (212) is provided with a guide sleeve (25), and two ends of each first hollow cavity (212) are respectively provided with a conductive contact finger (24).

6. The GIS double-break isolating switch according to claim 5, wherein: one side of the first conductive seat (211), which is back to the supporting insulator (72), is provided with a grounding static contact seat (41), and the grounding movable contact (42) is in plug-in fit with the grounding static contact seat (41) along the direction perpendicular to the central axis of the first hollow cavity (212).

7. The GIS double-break isolating switch of claim 1, wherein: the auxiliary moving contact seat (22) comprises a supporting conductor (224) and a second conductive seat (221), one end of the supporting conductor (224) is fixedly connected with the outer shell (1), the second conductive seat (221) is fixedly connected with the other end of the supporting conductor (224), a second hollow cavity (225) and a driving groove (222) are formed in the second conductive seat (221), a guide sleeve (25) is arranged in the middle of the second hollow cavity (225), a conductive contact finger (24) is arranged at one end, close to the first isolation fracture (I), of the second hollow cavity (225), the driving groove (222) is communicated with the second hollow cavity (225), the driving groove (222) is perpendicular to the central axis of the second hollow cavity (225), and a driving gear (223) is assembled in the driving groove (222).

8. The GIS double-break isolating switch of claim 1, wherein: keep apart stationary contact seat (23) including being fixed in the isolation stationary side conductor in sealed cavity (11), the both ends of keeping apart stationary side conductor are equipped with can be with same looks generating line extension conductor (8) of being connected, keep apart stationary side conductor and be close to the one end of first isolation fracture (I) and be equipped with electrically conductive chamber (231) it indicates (24) and striking contact (232) to be equipped with electrically conductive touching in electrically conductive chamber (231), and initiative contact (31) and electrically conductive touching indicate (24) and striking contact (232) cooperation of pegging graft.

9. The GIS double-break isolating switch of claim 1, wherein: the sealing cavity (11) comprises at least six flange ports capable of being sealed, a first flange port and a second flange port are respectively arranged at two opposite ends of the sealing cavity (11), a third flange port, a fourth flange port, a fifth flange port and a sixth flange port are arranged on the side wall of the shell (1) between the first flange port and the second flange port, the third flange port and the fourth flange port are oppositely arranged on one side close to the first flange port, and the fifth flange port and the sixth flange port are oppositely arranged on one side close to the second flange port; all auxiliary moving contact seats (22) are supported and fixed at the first flange opening in parallel, the second flange opening serves as an expansion opening, all grounding devices are arranged at the third flange opening in parallel, all grounding moving contacts (42) penetrate through the third flange opening and extend into the sealed cavity (11), all driving contact seats (21) are fixedly supported at the fourth flange opening in parallel, all grounding static contact seats (41) are located on one side, facing the third flange opening, of the driving contact seats (21), all isolation static contact seats (23) are supported on the fifth flange opening and the sixth flange opening in parallel, and each isolation static contact seat (23) is connected with a bus extension conductor (8) which can be connected to the same phase of bus.

10. The GIS double-break isolating switch of claim 1, wherein: the length of the insulating pull rod (33) is larger than or equal to that of the second isolation fracture (I I), the insulating pull rod (33) is formed by pouring epoxy resin, inserts (34) are arranged at two ends of the insulating pull rod (33), and the two inserts (34) are respectively embedded in the auxiliary moving contact (32) and the active contact (31).

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