CN113394045A

CN113394045A - High-capacity isolating switch

Info

Publication number: CN113394045A
Application number: CN202110763014.9A
Authority: CN
Inventors: 江美纯; 吴建辉
Original assignee: XIAMEN LRONGXK ELECTRICAL CO Ltd
Current assignee: XIAMEN LRONGXK ELECTRICAL CO Ltd
Priority date: 2021-07-06
Filing date: 2021-07-06
Publication date: 2021-09-14

Abstract

The invention relates to a high-capacity isolating switch which comprises a first isolating switch, a second isolating switch and a connecting terminal, wherein the wire inlet end of the first isolating switch and the wire inlet end of the second isolating switch are connected in parallel through the connecting terminal, the wire outlet end of the first isolating switch and the wire outlet end of the second isolating switch are also connected in parallel through the connecting terminal, the connecting terminal comprises at least two clamping lugs which are arranged at intervals, each clamping lug is of a flat sheet-shaped structure, and the clamping lugs are fixed through clamping of two adjacent clamping lugs to be electrically connected with an external conductive copper bar. The invention improves the current capacity of the isolating switch and simultaneously considers the reduction of the temperature rise of the isolating switch, thereby avoiding the overhigh temperature rise of products and further improving the capacity of the isolating switch.

Description

High-capacity isolating switch

Technical Field

The invention relates to the field of switch equipment, in particular to a high-capacity isolating switch.

Background

Under the social environment that the electricity consumption for daily life is higher and higher nowadays, the isolator is as the important switching electric device in distribution system, and the promotion of its capacity also receives more and more attention in industry. Generally speaking, when the current carrying capacity of the isolating switch is improved, the temperature rise of the conductive copper bar can be improved, the existing high-capacity isolating switch cannot solve the problem of the temperature rise of the conductive copper bar well, the current capacity is limited by the temperature rise, and the current capacity cannot be further improved.

Disclosure of Invention

Therefore, in order to solve the problems, the invention provides a large-capacity isolating switch with an optimized structure.

The invention is realized by adopting the following technical scheme:

the invention provides a high-capacity isolating switch, which is characterized in that: including first isolator, second isolator and connecting terminal, first isolator's inlet wire end and second isolator's inlet wire end pass through connecting terminal is parallelly connected mutually, and first isolator's leading-out terminal and second isolator's leading-out terminal also pass through connecting terminal is parallelly connected mutually, connecting terminal includes two at least mutual interval arrangement's centre gripping lug, the centre gripping lug is flat structure, and the clamp through two adjacent centre gripping lugs closes fixedly with the outside conductive copper bar of electricity connection.

The first isolating switch and the second isolating switch both further comprise inlet wire fixed contacts and outlet wire fixed contacts, wherein in order to further reduce the temperature rise, the preferred high-capacity isolating switch further comprises transition copper bars, the inlet wire ends of the first isolating switch and the second isolating switch are electrically connected with the inlet wire fixed contacts through the transition copper bars, and the outlet wire ends of the first isolating switch and the second isolating switch are electrically connected with the outlet wire fixed contacts through the transition copper bars.

Preferably, the transition copper bar is of a flat sheet structure, the incoming line static contact or the outgoing line static contact is vertically inserted and fixed on the transition copper bar, and the transition copper bar is fixedly attached to the incoming line end or the outgoing line end.

The high-capacity isolating switch further comprises a support, the first isolating switch and the second isolating switch are fixedly connected to the support, the first isolating switch is located at the upper end of the second isolating switch relatively, the second isolating switch is located at the lower end of the first isolating switch relatively, the first isolating switch comprises a first shell and a first incoming line copper bar serving as an incoming line end, the second isolating switch comprises a second shell and a second incoming line copper bar serving as an incoming line end, the first incoming line copper bar extends to the side edge of the first shell from the upper end of the first shell and bends downwards, the second incoming line copper bar extends to the side edge of the second shell from the upper end of the second shell and bends upwards, and accordingly the extending ends of the first incoming line copper bar and the second incoming line copper bar are aligned in the side face of the first shell oppositely to facilitate parallel connection of the connecting terminals.

Preferably, first isolator still includes the first copper bar of being qualified for the next round of competitions as the leading-out terminal, and second isolator still includes the second copper bar of being qualified for the next round of competitions as the leading-out terminal, first copper bar of being qualified for the next round of competitions extends to its side and buckles downwards from first casing lower extreme, the second copper bar of being qualified for the next round of competitions extends to its side and upwards buckles from second casing lower extreme to the first copper bar of being qualified for the next round of competitions and the second extends terminal counterpoint in the side of second casing in opposite directions to make things convenient for connecting terminal's parallelly connected.

Preferably, with the terminal setting in the first side of first casing of extending of first inlet wire copper bar and second inlet wire copper bar, the first extension terminal setting of being qualified for the next round of competitions the copper bar and second is in the second side with the second casing of the first side contralateral, thereby the rational utilization overall arrangement space, make advance, the leading-out terminal can not too be close to, thereby also can improve the heat dissipation function, reduce the temperature rise.

Preferably, an insulating plate is fixedly arranged between the first outgoing line copper bar and the second incoming line copper bar so as to insulate the first outgoing line copper bar and the second incoming line copper bar at intervals.

Preferably, the insulating plates include a first insulating plate, a second insulating plate and a third insulating plate, the first insulating plate is fixedly arranged between the first shell and the second shell, the second insulating plate and the third insulating plate are respectively located at two ends of the first insulating plate, and the first insulating plate, the second insulating plate and the third insulating plate are connected to form a Z-shaped structure.

Preferably, large capacity isolator still includes the locating plate, the locating plate is the upper and lower extension setting, and first isolator includes first casing, and second isolator includes the second casing, is equipped with the matching on first casing and the second casing respectively the first constant head tank and the second constant head tank of locating plate, both ends inlay respectively in first constant head tank and second constant head tank about the locating plate to realize first isolator and second isolator's counterpoint each other.

Preferably, an interphase insulating plate is further arranged between the phases of the inlet and outlet terminals of the first isolating switch and the second isolating switch.

The invention has the following beneficial effects: the invention improves the current capacity of the isolating switch and simultaneously considers the temperature rise reduction of the isolating switch, thereby avoiding the overhigh temperature rise of the product. Further improving the capacity of the isolating switch. Meanwhile, the insulation board is arranged, so that the electrical insulation performance is improved and the short circuit is prevented while the structure of the isolating switch is compact.

Drawings

FIG. 1 is a schematic perspective view (angle one) of a high capacity isolator switch in an embodiment;

FIG. 2 is a schematic perspective view (angle two) of the high-capacity disconnecting switch in the embodiment;

FIG. 3 is a schematic perspective view (angle one) of the bracket in the embodiment;

FIG. 4 is a perspective view (angle two) of the bracket in the embodiment;

FIG. 5 is a schematic perspective view of a first isolator switch in an embodiment;

FIG. 6 is a perspective view of a second isolation switch in the embodiment;

FIG. 7 is a schematic perspective view of a connection terminal in the embodiment;

FIG. 8 is a side view of a high capacity isolator switch in an embodiment (with one side bracket hidden to view the insulator plate);

FIG. 9 is a schematic perspective view of a high-capacity isolator in an embodiment (angle III, one side bracket is hidden to observe an insulating plate);

FIG. 10 is a schematic diagram of a large capacity isolating switch provided with interphase insulating plates in the embodiment;

FIG. 11 is an exploded view of a first isolating switch in the embodiment;

FIG. 12 is a schematic diagram of a conductive loop portion of a first isolator switch in an embodiment;

FIG. 13 is a schematic view of an operating mechanism in the embodiment;

fig. 14 is a schematic view of the operating mechanisms of the first and second disconnection switches of the embodiment synchronously coupled by the coupling sleeve;

fig. 15 is a schematic view of the pogo pin and the sliding bracket in the embodiment.

Detailed Description

To further illustrate the various embodiments, the invention provides the accompanying drawings. The accompanying drawings, which are incorporated in and constitute a part of this disclosure, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the embodiments. Those skilled in the art will appreciate still other possible embodiments and advantages of the present invention with reference to these figures. Elements in the figures are not drawn to scale and like reference numerals are generally used to indicate like elements.

The invention will now be further described with reference to the accompanying drawings and detailed description.

As a preferred embodiment of the present invention, a high-capacity isolation switch is provided, and as shown in fig. 1 to 4, the high-capacity isolation switch includes a first isolation switch 1 and a second isolation switch 2, and both the first isolation switch 1 and the second isolation switch 2 are fixedly connected (e.g. screwed) on a bracket 3, where for convenience of description, the first isolation switch 1 is relatively located at an upper end of the second isolation switch 2, and the second isolation switch 2 is relatively located at a lower end of the first isolation switch 1, that is, the first isolation switch 1 and the second isolation switch 2 are disposed in an up-down alignment manner. The support 3 is equipped with two of mirror image, fixes respectively in the both sides of first isolator 1 and second isolator 2, and support 3 specifically includes bed frame 31 and link 32, and bed frame 31 is the flakiness mechanism of bending, including stabilizer blade 311 and connection panel 312, and connection panel 312 fixed connection (like the spiro union) link 32, link 32 are the L type flakiness structure of bending, and its lamellar plane is fixed with connection panel 312 of bed frame 31, and another lamellar plane is fixed with first isolator 1 or second isolator 2. In this embodiment, three connecting frames 32 are provided on each bracket 3, and the first disconnecting switch 1 and the second disconnecting switch 2 are fixedly connected by the connecting frames 32, so that the bracket 3 has low cost and stable supporting function. Still be equipped with U type groove 3112 and hanging hole 3113 on stabilizer blade 311, place except that landing support 3 in this embodiment, can also hang the large capacity isolator through U type groove 3112 and hanging hole 3113 and establish on the wall, because large capacity isolator is heavier, consequently lift up large capacity isolator earlier, go into the screw of location on the wall through U type groove 3112 card, hang the screw of establishing on the wall with hanging hole 3113 again, push down large capacity isolator at last and make the screw further block in U type groove 3112 and hanging hole 3113, accomplish the fixed of large capacity isolator on the wall.

Referring to fig. 5-8, the first isolating switch 1 includes a first incoming line copper bar 11 as an incoming line end and a first outgoing line copper bar 12 as an outgoing line end, the second isolating switch 2 includes a second incoming line copper bar 21 as an incoming line end and a second outgoing line copper bar 22 as an outgoing line end, the first incoming line copper bar 11 and the second incoming line copper bar 21 are connected in parallel through a connecting terminal 4, the first outgoing line copper bar 12 and the second outgoing line copper bar 22 are also connected in parallel through the connecting terminal 4, so that the first isolating switch 1 and the second isolating switch 2 are connected in parallel to form a large-capacity isolating switch, in this embodiment, the first isolating switch 1 and the second isolating switch 2 are of the same structure, and the current capacity of the large-capacity isolating switch is improved by one time.

The connection terminal 4 includes a parallel connection portion 43, and a first clamping lug 41 and a second clamping lug 42 electrically connected to the parallel connection portion 43, wherein the parallel connection portion 43 is electrically connected to the wire inlet ends (or the wire outlet ends) of the first isolation switch 1 and the second isolation switch 2 at the same time, so as to realize the parallel connection of the first isolation switch 1 and the second isolation switch 2 at the wire inlet and the wire outlet ends. First centre gripping lug 41 and second centre gripping lug 42 all are flat structure, the two interval arrangement, when large capacity isolator worked a telephone switchboard, outside electrically conductive copper bar inserted between first centre gripping lug 41 and the second centre gripping lug 42 to it is fixed by first centre gripping lug 41 and the clamping of second centre gripping lug 42 clamp, specifically, adopt bolted connection's mode to make first centre gripping lug 41, second centre gripping lug 42 and outside electrically conductive copper bar closely clamp together in this embodiment, thereby realize the electricity and connect. Because this embodiment sets up first centre gripping lug 41 and second centre gripping lug 42 and comes the clamping to connect outside conductive copper bar, has increased heat radiating area, and first centre gripping lug 41 and second centre gripping lug 42 dispel the heat simultaneously, reduce the temperature rise of product during operation, have improved electrical property.

Although the present embodiment is provided with two clamping lugs (i.e. the first clamping lug 41 and the second clamping lug 42) for wiring, in other embodiments, three, four or more clamping lugs may be provided according to the number of external conductive copper bars to be wired, each clamping lug is arranged at an interval, and the two adjacent clamping lugs are clamped and fixed to electrically connect with the external conductive copper bars, so as to reduce the temperature rise of the product while ensuring the improvement of the current capacity.

First isolator 1 includes first casing 10, second isolator 2 includes second casing 20, first inlet wire copper bar 11 extends to its side and buckles downwards from first casing 10 upper end, second inlet wire copper bar 21 extends to its side and upwards buckles from second casing 20 upper end, thereby first inlet wire copper bar 11 and second inlet wire copper bar 21 extend

terminal

110, 210 counterpoint in the side of first casing 10 in opposite directions, that is to say, first inlet wire copper bar 11 and second inlet wire copper bar 21 extend each other in the side of first casing 10 and are close to, thereby connecting terminal 4 parallel connection portion 43 can conveniently carry out the electricity with comparatively close to first inlet wire copper bar 11 and second inlet wire copper bar 21 and be connected.

Similarly, the first outgoing line copper bar 12 extends to the side edge of the first casing 10 from the lower end of the first casing and bends downward, and the second outgoing line copper bar 22 extends to the side edge of the second casing 20 from the lower end of the second casing and bends upward, so that the extending

ends

120 and 220 of the first outgoing line copper bar 12 and the second outgoing line copper bar 22 are opposite to each other on the side surface of the second casing 20, that is, the first outgoing line copper bar 12 and the second outgoing line copper bar 22 extend to be close to each other on the side surface of the second casing 20, so as to facilitate the connection of the connection terminal 4.

Preferably, the extension ends 110 of the first inlet copper bar 11 and the second inlet copper bar 21 are defined, 120 is disposed on the first side of the first housing 10, the extension ends 120 of the first outlet copper bar 12 and the second outlet copper bar 22 in the embodiment are disposed on the second side of the second housing 20 opposite to the first side, i.e., the connection terminal 4 of the inlet end of the high-capacity isolating switch and the connection terminal 4 of the outlet end are respectively disposed on the two opposite sides of the high-capacity isolating switch, so that the layout space is reasonably utilized, the inlet end and the outlet end are not too close to each other, thereby the heat dissipation function can be improved, and the temperature rise is reduced.

Although the above preferred arrangement of the inlet and outlet copper bars is described in this embodiment, in practical applications, other arrangement of the inlet and outlet copper bars may be adopted as needed, as long as the inlet ends and the outlet ends of the two isolating switches are connected in parallel by the connecting terminals.

In order to install, conveniently carry out counterpoint of first isolator 1 and second isolator 2, as fig. 2, large capacity isolator still includes locating plate 9, locating plate 9 is upper and lower extension setting, be equipped with the first constant head tank and the second constant head tank (for example the first constant head tank 13 in fig. 2) that match locating plate 9 on first casing 10 and the second casing 20 respectively, both ends inlay respectively in first constant head tank and second constant head tank about locating plate 9 to realize counterpointing each other of first isolator 1 and second isolator 2.

And, as shown in fig. 8-9, since the first outgoing copper bar 12 and the second incoming copper bar 21 are relatively close to each other, in order to ensure that the structure of the isolating switch is compact and at the same time the isolating switch is electrically insulated, thereby preventing short circuit, an insulating plate is further provided between the first outgoing copper bar 12 and the second incoming copper bar 21, the insulating plate includes a first insulating plate 300, a second insulating plate 301 and a third insulating plate 302, the first insulating plate 300 is fixedly disposed between the first casing 10 and the second casing 20, the second insulating plate 301 and the third insulating plate 302 are respectively disposed at two ends of the first insulating plate 300, the second insulating plate 301 and the third insulating plate 302 are joined to form a "Z" -shaped structure, so that the insulating plate sufficiently insulates the first outgoing copper bar 12 and the second incoming copper bar 21 between the first outgoing copper bar 12 and the second incoming copper bar 21 at intervals. For the fixation of the first insulating plate 300, the second insulating plate 301 and the third insulating plate 302, they may be alternatively fixed to the positioning plate 9 by inserting, or may be fixed to the first casing 10 or the second casing 20 by other fixing methods, such as screwing.

In addition, in order to improve the phase-to-phase insulation performance, referring to fig. 10, a phase separation plate 303 may be further installed between the phases (as in the case of the three-phase high-capacity disconnecting switch illustrated in this embodiment, a phase separation plate 303 may be provided between the incoming and outgoing line ends of two adjacent phases), and the phase separation plate 303 may be fixed to the second insulating plate 301 or the third insulating plate 302 by plugging to complete the installation thereof.

Except for different arrangement modes of the inlet and outlet copper bars, the structures of the contact systems in the first isolating switch 1 and the second isolating switch 2 of the embodiment are the same, and the first isolating switch 1 is taken as an example for description. Referring to fig. 11-12, the first housing 10 of the first isolating switch 1 includes an upper housing 101 and a lower housing 102 which are joined together, the first incoming copper bar 11 is fixed on the upper housing 101 by bolt connection, and the first outgoing copper bar 12 is fixed on the lower housing 102 by bolt connection; the contact system of the first isolating switch 1 comprises an incoming line static contact 61 electrically connected with the first incoming line copper bar 11, an outgoing line static contact 62 electrically connected with the first outgoing line copper bar 12, and a movable contact assembly 7 movably arranged inside the first shell 10, wherein the movable contact assembly 7 is simultaneously contacted with or separated from the incoming line static contact 61 and the outgoing line static contact 62 through the movement of the movable contact assembly, so that the first isolating switch 1 is switched on or switched off. In the present embodiment, the movable contact assembly 7 includes a sliding support 72 slidably connected in the first housing 10, and the movable contact 71 is fixedly connected to the sliding support 72 to connect or disconnect the circuit along with the sliding support 72. The moving contact 71 in this example is a roller-type moving contact, and when the sliding support 72 slides to achieve contact connection, the fixed contact is inserted between the contact rollers, and keeps close contact under the clamping of the contact rollers, and the contact rollers roll, so as to improve the contact performance and prevent the contact from fusion welding.

In particular, the present embodiment is further provided with a transition copper bar 5, and the first incoming copper bar 11 (the first outgoing copper bar 12) and the incoming static contact 61 (the outgoing static contact 62) are electrically connected through the transition copper bar 5. For example, referring to fig. 11-12, the transition copper bar 5 is embedded in the upper housing 101, the transition copper bar 5 is a flat plate structure, the incoming line static contact 61 is vertically inserted and fixed in the jack formed on the transition copper bar 5, and the first incoming line copper bar 11 is screwed and fixed with the transition copper bar 5 and tightly attached. The lead-in and lead-out terminal and the static contact are connected by arranging the transition copper bar 5, and the static contact is vertically inserted in the flat transition copper bar 5, so that the heat dissipation area is further enlarged, and the temperature rise of a product is reduced.

In order to extinguish the arc generated during the breaking, the arc extinguishing grid piece 400 is further fixedly arranged on the periphery of the static contact. Meanwhile, in order to buffer the sliding stroke of the sliding bracket 72, a buffer pad 600 may be further disposed on the sliding path of the sliding bracket 72 to prevent the sliding bracket 72 from striking the housing to be damaged, and in particular, in the present embodiment, the buffer pad 600 is fixedly disposed on the first housing 10.

The driving of the sliding bracket 72 is realized by the operating mechanism 8, referring to fig. 13-14, the operating mechanism 8 includes a rotating shaft 81 rotatably disposed on the first housing 10, a cantilever 82 whose hub is connected to the rotating shaft 81, and a tension spring 83 for providing an elastic force for the cantilever 82 to rotate around the axis of the rotating shaft 81, the rotating shaft 81 is manually or electrically operated to rotate so that the tension force of the tension spring 83 passes through a dead point, the tension spring 83 pulls the cantilever 82 to swing rapidly, and the cantilever 82 is linked to the sliding bracket 72 in a linking manner, so that the sliding bracket 72 slides. The operating mechanisms 8 on the first isolating switch 1 and the second isolating switch 2 are coaxially connected through the coupling sleeve 500, so that the operating mechanisms 8 on the first isolating switch 1 and the second isolating switch 2 can synchronously move, and further synchronously drive the moving contact assemblies 7 of the first isolating switch 1 and the second isolating switch 2 to move.

Referring to fig. 15, in the present embodiment, an elastic needle 700 is further provided, the sliding support 72 is provided with a sliding slot 721 opened along the sliding direction, the elastic needle 700 is embedded in the first housing 10 and is engaged in the sliding slot 721, when the sliding support 72 slides, the sliding slot 721 presses the elastic needle 700 to elastically deform the elastic needle 700 so as to generate elastic potential energy, specifically, in the present embodiment, the sliding slot 721 and the elastic needle 700 are configured such that when the operating mechanism 8 is at the dead point, the deformation amount of the elastic needle 700 is the largest, and the elastic potential energy is also large, so that when the operating mechanism 8 pulls the sliding support 72 to slide through the dead point, the elastic needle 700 releases the elastic potential energy thereof, so as to accelerate the sliding of the sliding support 72 and improve the switch-on performance of the switch. Of course, in other embodiments, the elastic needle 700 may be replaced by another elastic member, such as a spring, a spring plate, etc., but in this embodiment, the sliding of the sliding bracket 72 can also be limited by the cooperation of the sliding slot 721 and the elastic needle 700, so as to avoid that the sliding bracket 72 in the opening state automatically slides and closes under the influence of gravity when the disconnecting switch is installed in an inclined state.

While the invention has been particularly shown and described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

1. High capacity isolator, its characterized in that: including first isolator, second isolator and connecting terminal, first isolator's inlet wire end and second isolator's inlet wire end pass through connecting terminal is parallelly connected mutually, and first isolator's leading-out terminal and second isolator's leading-out terminal also pass through connecting terminal is parallelly connected mutually, connecting terminal includes two at least mutual interval arrangement's centre gripping lug, the centre gripping lug is plain film column structure, and the clamp through two adjacent centre gripping lugs is fixed with the outside copper bar of electricity connection.

2. A high capacity isolator as claimed in claim 1, wherein: the first isolating switch and the second isolating switch both further comprise inlet wire fixed contacts and outlet wire fixed contacts and also comprise transition copper bars, the inlet wire ends of the first isolating switch and the second isolating switch are electrically connected with the inlet wire fixed contacts through the transition copper bars, and the outlet wire ends of the first isolating switch and the second isolating switch are electrically connected with the outlet wire fixed contacts through the transition copper bars.

3. A bulk isolation switch as claimed in claim 2, wherein: the transition copper bar is of a flat sheet-shaped structure, the incoming line static contact or the outgoing line static contact is vertically inserted and fixed on the transition copper bar, and the transition copper bar is fixedly attached to the incoming line end or the outgoing line end.

4. A high capacity isolator as claimed in claim 1, wherein: still include the support, the equal fixed connection of first isolator and second isolator is in on the support to first isolator is in second isolator's upper end relatively, and second isolator is in first isolator's lower extreme relatively, and first isolator includes first casing and the first inlet wire copper bar as the inlet wire end, and second isolator includes the second casing and the second inlet wire copper bar as the inlet wire end, first inlet wire copper bar extends to its side and buckles downwards from first casing upper end, the second inlet wire copper bar extends to its side from second casing upper end and upwards buckles, thereby the side of first inlet wire copper bar and second inlet wire copper bar is counterpointed relatively to the extension end of first inlet wire copper bar and second inlet wire copper bar.

5. A high capacity isolator as claimed in claim 4, wherein: the first isolating switch further comprises a first outgoing line copper bar serving as an outgoing line end, the second isolating switch further comprises a second outgoing line copper bar serving as an outgoing line end, the first outgoing line copper bar extends to the side edge of the first shell from the lower end of the first shell and bends downwards, the second outgoing line copper bar extends to the side edge of the second shell from the lower end of the second shell and bends upwards, and therefore the extending ends of the first outgoing line copper bar and the second outgoing line copper bar are opposite to each other on the side face of the second shell.

6. A high capacity isolator as claimed in claim 5, wherein: the extending tail ends of the first wire inlet copper bar and the second wire inlet copper bar are arranged on the first side of the first shell, and the extending tail ends of the first wire outlet copper bar and the second wire outlet copper bar are arranged on the second side of the second shell opposite to the first side.

7. A high capacity isolator as claimed in claim 5, wherein: an insulating plate is fixedly arranged between the first outgoing line copper bar and the second incoming line copper bar so as to insulate the first outgoing line copper bar and the second incoming line copper bar at intervals.

8. A bulk isolation switch as claimed in claim 7, wherein: the insulating board includes first insulating board, second insulating board and third insulating board, and first insulating board is fixed to be set up between first casing and second casing, and second insulating board and third insulating board are located first insulating board both ends respectively, and first insulating board, second insulating board and third insulating board link up and are "Z" style of calligraphy structure.

9. A high capacity isolator as claimed in claim 4, wherein: the positioning plate is arranged to extend up and down, a first positioning groove and a second positioning groove of the positioning plate are respectively matched with the first shell and the second shell, and the upper end and the lower end of the positioning plate are respectively embedded in the first positioning groove and the second positioning groove so as to realize mutual alignment of the first isolating switch and the second isolating switch.

10. A high capacity isolator as claimed in claim 1, wherein: an interphase insulating plate is arranged between the phases of the inlet and outlet ends of the first isolating switch and the second isolating switch.