CN217768206U - Environment-friendly ring main unit circuit breaker and isolating switch thereof - Google Patents

Abstract

The application relates to an environment-friendly ring main unit circuit breaker and an isolating switch thereof, relating to the field of circuit breakers; the isolating switch is arranged in the gas tank and mainly comprises a moving contact, a fixed contact, a grounding contact and a switching component, wherein the fixed contact is electrically connected with a fixed conductive end of the arc extinguish chamber, and the grounding contact is fixedly arranged in the gas tank; one end of the switching component is rotatably connected with the air box, one end of the switching component, which is far away from the box body, is fixedly connected with the movable tool bit, and the movable tool bit is electrically connected with an incoming and outgoing line connecting row of the circuit breaker; the static contact is electrically connected with the static conductive end of the arc extinguish chamber, and the switching component drives the moving cutter head to be connected with the static contact, far away from the static contact or clamped with the grounding contact. This application has the effect that promotes isolator reliability.

Description

Environment-friendly ring main unit circuit breaker and isolating switch thereof

Technical Field

The application relates to the field of circuit breakers, in particular to an environment-friendly ring main unit circuit breaker and an isolating switch thereof.

Background

At present, most of 12kV ring main units used in the market mainly adopt three modes of traditional air insulation, SF6 gas insulation and solid insulation. The SF6 gas insulated switchgear is mainly represented by an SF6 gas-filled switchgear, a high-voltage switch and a high-voltage primary charged body are arranged in a metal sealed gas box filled with SF6, and the requirements on electrical performance are met by the aid of the insulating capacity and the arc extinguishing capacity of SF6 gas. Insulating meson SF6 in the looped netowrk cabinet produces high temperature through breaking open in the use for SF6 part decomposes and generates poisonous low fluoride, like SOF2, SF4, SOF4 and SO2F2 etc. has the influence to the health, also has corruption and degradation to metal parts, if leak can cause serious harm incident. In order to safely supply power in the environment where environmental protection is advocated, those skilled in the art tend to replace SF6 with a more environmentally friendly dry gas.

In the prior art, a disconnecting switch is often arranged in a gas box, the disconnecting switch is arranged at a static conductive end of an arc extinguish chamber in the gas box and is electrically connected with an incoming and outgoing line connecting bar of a circuit breaker, a control component is arranged at a movable conductive end of the arc extinguish chamber, and the control component is arranged at a pull rod on the movable conductive end and is used for controlling the connection and disconnection of a loop between a flexible connection on the pull rod and a connecting bus bar of the circuit breaker. The isolating switch mainly comprises a transmission large shaft, an isolating switch operating mechanism is arranged on the transmission large shaft in a transmission mode during use, and the isolating switch is controlled to be switched on and switched off through the isolating switch operating mechanism.

In practical use, the inventor finds that the disconnecting switch on the existing circuit breaker is mainly suitable for a conventional SF6 gas disconnecting switch, and the disconnecting switch is complex in structure, long in transmission chain, low in stability and improved.

SUMMERY OF THE UTILITY MODEL

In order to improve the reliability of the circuit breaker of the environmental-friendly ring main unit and the isolating switch thereof.

The isolating switch is installed in an air box and comprises a moving contact, a static contact, a grounding contact and a switching assembly, wherein the static contact is electrically connected with a static conductive end of an arc extinguish chamber, and the grounding contact is fixedly arranged in the air box;

one end of the switching component is rotatably connected with the air box, one end of the switching component, which is far away from the air box, is fixedly connected with the movable tool bit, and the movable tool bit is electrically connected with an incoming and outgoing line connecting row of the circuit breaker;

the static contact is electrically connected with the static conductive end of the arc extinguish chamber, and the switching component drives the moving cutter head to be connected with the static contact, far away from the static contact or clamped with the grounding contact.

By adopting the technical scheme, in actual use, after the isolating switch is installed in the air box, dry environment-friendly gas can be filled in the air box to serve as an insulating medium, such as nitrogen or air, and at the moment, temperature rise caused by opening and closing of the isolating switch acts on less harmful gas generated by the insulating gas in the air box, so that the isolating switch is more environment-friendly. When a worker needs to switch on a high-voltage loop, the switching component can be controlled through the external isolating switch operating mechanism so as to drive the moving cutter head to be electrically connected with the static contact; when the worker needs to open the brake to cut off the high-voltage loop, the switching component can be controlled through the external isolating switch operating mechanism so as to drive the moving cutter head to be separated from the static contact; when the staff need examine and repair inside the gas tank, can switch over moving the tool bit to fixed with ground contact joint. Through the reasonable collocation and use between the movable cutter head, the static contact and the switching component, a worker controls the isolating switch to realize the operations of closing, opening or grounding through an external isolating switch operating mechanism, the effect of integrating the isolating switch into a whole is realized, the number of parts used by the isolating switch is effectively reduced, and the occupied volume of the isolating switch in the air box is reduced. Meanwhile, the air box is always in a sealed operation environment, and the reliability and the safety of the circuit breaker are effectively improved.

Preferably, an insulating frame body is fixedly arranged in the air box, a limiting part is fixedly connected to the insulating frame body, and a space for accommodating the moving cutter head is formed between the limiting part and the static contact;

after the switching component drives the moving contact and the fixed contact to be closed, the moving contact is clamped between the fixed contact and the limiting part.

By adopting the technical scheme, as the limiting part is arranged on the insulating frame body, when a worker needs to switch on a high-voltage loop, the movable cutter head can be driven to be clamped between the limiting part and the fixed cutter head through the control of the switching component, so that the fixed cutter head is in contact connection with the movable cutter head more tightly, the isolating switch has higher stability, and the working stability of the circuit breaker is further effectively improved.

Preferably, the insulation frame body is fixedly provided with a mounting seat, the mounting seat is fixedly connected with a mounting plate, and the mounting plate is electrically connected with the incoming and outgoing line connecting bar;

the movable cutter head is rotatably connected with the mounting seat, and the movable cutter head is electrically connected with the mounting plate.

Through adopting above-mentioned technical scheme, through the mount pad, can realize moving the installation of tool bit on the gas tank, and can realize business turn over line connecting row and move the electric connection between the tool bit through the mounting panel that sets up on the mount pad, rotate the tool bit through switching components when the staff for the tool bit is connected with the static contact electricity, can make business turn over line connecting row and the movable end electricity that leads of explosion chamber be connected, and then realize the effect of switch-on high-voltage circuit.

Preferably, a rotating shaft is fixedly arranged on the mounting seat, the rotating shaft sequentially penetrates through the mounting plate and the movable blade, and the movable blade head is in rotating fit with the rotating shaft;

the one end that the axis of rotation passed the hole is fixed to be provided with and keeps off the card, move the tool bit and be located keep off the card with between the mounting panel.

By adopting the technical scheme, the movable tool bit and the mounting seat are rotationally matched through the reasonable matching of the rotating shafts; when the staff rotates the in-process through switching over subassembly control movable blade in the axis of rotation, keep off the card and can effectively reduce the condition emergence that the movable blade breaks away from the axis of rotation, and then promoted isolator's stability.

Preferably, the mounting plate extends outwards and is provided with a bearing table, and the incoming and outgoing line connecting row is fixed on the bearing table.

Through adopting above-mentioned technical scheme, business turn over line connecting row passes through welding or the joint is fixed back on the mounting panel, and the platform of carrying forms the support effect to business turn over line connecting row, and the condition that effectively reduces business turn over line and break away from the mounting panel takes place, has effectively promoted isolator's stability.

Preferably, the switching assembly comprises a main shaft of the isolating switch, a control part and a connecting part;

the isolating switch main shaft is fixedly arranged in the insulating frame, one end of the control piece is rotatably connected with the isolating switch main shaft, one end of the control piece, which is far away from the isolating switch main shaft, is rotatably connected with the connecting piece, and one end of the connecting piece, which is far away from the isolating switch main shaft, is fixedly connected with the moving cutter head;

the isolating switch main shaft drives the moving cutter head to close or keep away from the static contact.

By adopting the technical scheme, through reasonable matching and use between the isolating switch main shaft and the connecting piece, a worker can drive the connecting piece through the control piece, and the connecting piece drives the movable blade to be clamped into or far away from the static contact, so that the effect of mechanical transmission between the isolating switch main shaft and the connecting piece is realized.

Preferably, a protective shell is fixedly arranged on the connecting piece and covers the outer side wall of the movable blade.

Through adopting above-mentioned technical scheme, when the connecting piece controlled the effect of control key, when the application of force in the moving blade, the protective housing can effectively reduce the direct contact between moving blade and the connecting piece, can effectively prevent the too big harm that causes the moving blade of connecting piece action range, forms good protection effect to the moving blade.

The second purpose of the application is to provide an environment-friendly ring main unit circuit breaker, which comprises the isolating switch, wherein a pull rod is arranged on a movable conductive end of an arc extinguish chamber, a flexible connection is fixedly arranged on the pull rod, and a connecting bus is fixedly arranged on the circuit breaker;

the pull rod is provided with a breaker spindle in a transmission mode, and the breaker spindle controls the on-off of a loop between the flexible connection and the connecting busbar.

Through adopting above-mentioned technical scheme, possess the circuit breaker that has above-mentioned isolator, have above-mentioned isolator's environmental protection performance simultaneously good, small and stability advantage such as high. In practical use, when a worker needs to switch on a high-voltage loop, the movable blade and the fixed contact can be clamped and fixed, and then a loop between the movable conductive end of the arc extinguish chamber and the connecting bus bar is switched on; when the operator needs to open the brake to cut off the high-voltage loop, the loop between the movable conductive end and the connecting busbar can be cut off, and then the brake opening operation of the isolating switch is carried out. When the staff need control the moving of explosion chamber and be connected when arranging the break-make of return circuit between the row, the external circuit breaker operating device of accessible control circuit breaker main shaft, through the reasonable collocation use between circuit breaker main shaft and the flexible coupling, can effectively transmit external circuit breaker operating device's mechanical action, and then make the gas tank keep the effect of the steerable circuit breaker operating condition of staff when confined, make the leakproofness of circuit breaker higher.

In summary, the present application includes at least one of the following beneficial technical effects:

through reasonable matching and use among the static contact, the moving contact, the grounding contact and the switching component, the isolating switch has the advantage of integrating three functions of closing, opening and grounding, and the reliability of the isolating switch is effectively improved;

due to the addition of the limiting part, the movable contact and the static contact are connected more tightly, the situation that the movable contact is separated from the static contact is reduced, the situation that the isolating switch is in poor contact after being put into use is effectively reduced, and the isolating switch has higher reliability;

through the setting of isolator main shaft and circuit breaker main shaft, the operating device control isolator of staff's accessible peripheral hardware closes the separating brake state with the circuit breaker, has effectively promoted the convenient degree that the staff used looped netowrk cabinet circuit breaker, the insulating gas's of reducible gas tank inner seal reveal simultaneously.

Drawings

Fig. 1 is a schematic diagram for showing an overall structure of a circuit breaker of an environmental protection ring main unit according to an embodiment of the present application.

Fig. 2 is a schematic connection structure diagram for showing that the disconnecting switch is in an open state according to the embodiment of the application.

Fig. 3 is a schematic diagram for showing a connection structure of a disconnecting switch and a ground contact according to an embodiment of the present application.

Description of reference numerals: 1. an arc extinguishing chamber; 2. a movable cutter head; 3. static contact; 4. a ground contact; 5. a switching component; 51. a main shaft of the isolating switch; 52. a control member; 53. a connecting member; 54. a protective shell; 6. an insulating frame body; 61. a limiting member; 62. a mounting seat; 621. a rotating shaft; 622. blocking the card; 63. mounting a plate; 631. a receiving table; 7. the inlet and outlet lines are connected; 8. a circuit breaker main shaft; 81. a pull rod; 82. soft connection; 9. and connecting the busbar.

Detailed Description

The present application is described in further detail below with reference to figures 1-3.

Example 1:

the embodiment of the application discloses an isolating switch. The isolating switch is arranged in the air box and mainly comprises a moving cutter head 2, a static contact 3, a grounding contact 4 and a switching component 5.

Referring to fig. 1, an insulation frame body 6 is fixedly arranged in the gas box, and an arc extinguish chamber 1 of the circuit breaker is erected and fixed on the frame body.

In this embodiment, the insulation frame body 6 is preferably formed by casting a PA66 material injection molding process, and has the advantages of being reusable, good in molding, high-temperature resistant, corrosion resistant and the like, so that the service life of the circuit breaker is effectively prolonged. Meanwhile, the insulation frame body 6 is designed after analyzing the electric field layout and the insulation structure through software, is provided with an inner umbrella skirt and an outer umbrella skirt which increase the creepage distance, increases the insulation distance and the strength, and has the characteristics of uniform electric field distribution, reasonable insulation structure, strong insulation performance and the like.

Referring to fig. 1, a static contact 3 is fixedly arranged on a static conductive end of an arc extinguish chamber 1 by welding or screws, and the static conductive end is electrically connected with the static contact 3; the insulator body 6 is integrally provided with a mounting seat 62, and the movable cutter head 2 is rotatably arranged on the mounting seat 62; the grounding contact 4 is fixed on the insulating frame body 6 through a screw; switching component 5 integrated into one piece sets up on insulator frame 6 for drive move tool bit 2 joint static contact 3, keep away from static contact 3 or joint ground contact 4.

Referring to fig. 1 and 2, the switching assembly 5 is electrically connected to an in-out connection bank 7 of circuit breakers. When a worker drives the moving contact 2 and the static contact 3 to be clamped and fixed through the switching component 5, the effect of switching on a high-voltage loop can be realized; when the staff moves tool bit 2 and keeps away from static contact 3 through switching component 5 drive, can realize the effect that the separating brake cuts off the high-voltage circuit.

Referring to fig. 3, when the worker drives the movable cutter head 2 to be clamped on the grounding contact 4 through the switching component 5, the grounding effect of the movable cutter head 2 can be realized, and the maintenance is convenient.

Through the reasonable collocation use between switching module 5, move tool bit 2, static contact 3 and the ground contact 4 for isolator possesses close a floodgate, separating brake and three kinds of states as an organic whole of ground connection, has effectively reduced isolator to the occupation of gas tank inner space, makes gas tank inner structure more compact.

In order to make the contact between the moving blade 2 and the stationary contact 3 more tight, referring to fig. 1, in the present embodiment, a limiting member 61 is fixed on the insulating frame 6 by welding or screws, and a space for accommodating the moving blade 2 is formed between the limiting member 61 and the stationary contact 3. When the staff drives the moving blade to be connected with the fixed contact 3 through the switching component 5, the moving blade is clamped between the limiting part 61 and the fixed contact 3.

When the moving blade 2 contacts the static contact 3 to connect the high-voltage circuit, the limiting part 61 can effectively reduce the occurrence of the situation that the moving blade 2 is separated from the static contact 3, so that the contact connection between the moving blade 2 and the static contact 3 has higher stability.

Referring to fig. 1 and 2, an installation seat 62 is fixed to the insulator frame 6 by screws or welding, and an installation plate 63 is fixed to the installation seat 62 by welding. Integrated into one piece has axis of rotation 621 on the mount pad 62, and axis of rotation 621 wears to establish mounting panel 63 in proper order and moves tool bit 2, and moves tool bit 2 and axis of rotation 621 normal running fit, has realized moving the normal running fit between tool bit 2 and the gas tank.

Meanwhile, the inlet and outlet wire connecting row 7 is electrically connected with the mounting plate 63, and the movable tool bit 2 is electrically connected with the mounting plate 63. When the staff moves tool bit 2 and static contact 3 contact through switching over subassembly 5 control, with the combined floodgate of circuit breaker again, can realize the effect that switches on of high-pressure return circuit.

Referring to fig. 1, a stop 622 is fixedly disposed on one end of the rotating shaft 621 penetrating through the movable blade by welding, and the movable blade 2 is located between the mounting plate 63 and the movable blade 2. When a user drives the moving blade head 2 to rotate on the mounting base 62 through the switching component 5, the blocking clip 622 can effectively reduce the occurrence of the situation that the moving blade falls off from the mounting plate 63, so that the isolating switch has higher reliability.

Referring to fig. 1, the mounting plate 63 extends outwards to form a receiving platform 631, the receiving platform 631 forms a support for the incoming and outgoing line connecting row 7, the occurrence of the falling-off condition of the incoming and outgoing line connecting row 7 is effectively reduced, and effective guarantee is provided for the normal use of the isolating switch.

Referring to fig. 1, in the present embodiment, the switching assembly 5 includes a control member 52, a disconnecting switch main shaft 51, and a connecting member 53. Wherein, the main shaft 51 of the isolating switch is fixed on the insulating frame body 6 through a screw; the control member 52 is rotatably arranged on the isolating switch main shaft 51 through sleeving; one end of the control member 52 far away from the main shaft 51 of the isolating switch is rotatably connected with the connecting member 53; one end of the connecting piece 53 far away from the control piece 52 is fixedly connected with the moving blade head 2.

When the isolating switch is put into practical use, an isolating switch operating mechanism is additionally arranged on the isolating switch main shaft 51, and a worker can control the control piece 52 and the connecting piece 53 to mechanically transmit through the isolating switch operating mechanism, so that the effect of driving the movable cutter head 2 to rotate is achieved.

In the actual use, the staff can pour dry environmental protection gases such as nitrogen gas or air in the gas tank, because isolator passes through isolator operating device control, can make the interior comparatively sealed space that forms of gas tank. When the disconnecting switch is put into use of the circuit breaker, the emission of toxic gas of the circuit breaker can be reduced, and the circuit breaker is more environment-friendly.

Referring to fig. 1, in the present embodiment, a protective shell 54 is fixedly connected to an end of the connecting member 53 away from the control member 52, and the protective shell 54 is adapted to the movable blade 2. The protective shell 54 is fixedly connected to the connecting piece 53 through screws, and the movable blade is inserted and fixed in the protective shell 54.

Through the arrangement of the protective shell 54, the direct contact between the connecting piece 53 and the movable cutter head 2 can be effectively reduced, and when the action radian of the connecting piece 53 is too large, the protective shell 54 can form an effective guarantee for the movable cutter head 2.

In the present embodiment, the isolating switch main shaft 51 is preferably made of PC material, and has the main characteristics of high impact strength, good mechanical properties, good electrical insulation properties, no environmental pollution, and the like, and is more environment-friendly.

The implementation principle of the isolating switch in the embodiment of the application is as follows: through reasonable collocation and use among the control piece 52, the connecting piece 53, the movable cutter head 2, the connecting piece 53 and the static contact 3, the three-in-one effect of closing, opening and grounding operations of the isolating switch is realized, so that the isolating switch has higher reliability and stability, meanwhile, the gas leakage condition in the gas tank can be reduced, and the isolating switch is more environment-friendly and healthy.

Example 2:

the application also provides an environmental protection ring main unit breaker, which has the disconnecting switch mentioned in embodiment 1, and therefore has the advantages of the disconnecting switch, such as high reliability, environmental protection, high stability and the like.

Referring to fig. 1, a pull rod 81 is disposed at a movable conductive end of the arc extinguish chamber 1, a flexible connection 82 is disposed on the pull rod 81, and a breaker spindle 8 is fixed on the pull rod 81 through a screw. In the actual use, the circuit breaker main shaft 8 is connected with the peripheral circuit breaker operating mechanism in a transmission mode, and a worker can control the circuit breaker main shaft 8 through the circuit breaker operating mechanism to achieve the effect of controlling the on-off of an electric connection loop between the flexible connection 82 and the connecting busbar and further achieve the effect of controlling the on-off operation of the circuit breaker.

In this embodiment, the flexible connection 82, the breaker main shaft 8 and the pull rod 81 are all sealed in a gas tank and are covered by an environmental protection gas.

In the embodiment, the breaker spindle 8 preferably uses a high-strength epoxy resin glass fiber aromatic glass insulating hexagonal rod widely used in the industry, and has ultrahigh strength, excellent wear resistance, acid and alkali resistance and excellent high temperature resistance.

The implementation principle of the circuit breaker of the environmental protection ring main unit in the embodiment of the application is as follows: through reasonable collocation and use among isolator, circuit breaker main shaft 8 and flexible coupling 82, can realize the on-off control of the inside high-voltage circuit of circuit breaker. Meanwhile, the breaker is provided with the disconnecting switch with high reliability and good stability, so that the breaker has high reliability and stability.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims (8)

1. An isolating switch is installed in an air box and is characterized by comprising a moving cutter head (2), a static contact (3), a grounding contact (4) and a switching component (5), wherein the static contact (3) is electrically connected with a static conductive end of an arc extinguish chamber (1), and the grounding contact (4) is fixedly arranged in the air box;

one end of the switching component (5) is rotatably connected with the air box, one end of the switching component (5) far away from the air box is fixedly connected with the movable cutter head (2), and the movable cutter head (2) is electrically connected with an incoming and outgoing line connecting row (7) of the circuit breaker;

the static contact (3) is electrically connected with the static conductive end of the arc extinguish chamber (1), the switching component (5) drives the moving cutter head (2) to be connected with the static contact (3), to be far away from the static contact (3) or to be clamped with the grounding contact (4).

2. The isolating switch according to claim 1, wherein an insulating frame body (6) is fixedly arranged in the gas tank, a limiting member (61) is fixedly connected to the insulating frame body (6), and a space for accommodating the moving cutter head (2) is formed between the limiting member (61) and the static contact (3);

the switching component (5) drives the movable cutter head (2) and the static contact (3) to be closed, and the movable cutter head (2) is clamped between the static contact (3) and the limiting part (61).

3. The isolating switch according to claim 2, characterized in that the insulating frame body (6) is fixedly provided with a mounting seat (62), the mounting seat (62) is fixedly connected with a mounting plate (63), and the mounting plate (63) is electrically connected with the incoming and outgoing line connecting bar (7);

move the tool bit (2) with mount pad (62) rotate to be connected, just move tool bit (2) with mounting panel (63) electricity is connected.

4. The isolating switch according to claim 3, characterized in that a rotating shaft (621) is fixedly arranged on the mounting base (62), the rotating shaft (621) sequentially penetrates through the mounting plate (63) and the moving blade, and the moving blade (2) is in rotating fit with the rotating shaft (621);

the rotating shaft (621) penetrates through one end of the movable blade and is fixedly provided with a blocking clamp (622), and the movable blade (2) is located between the blocking clamp (622) and the mounting plate (63).

5. A disconnector according to claim 4, characterized in that the mounting plate (63) extends outwardly with a receiving abutment (631), the access line connection bank (7) being fixed to the receiving abutment (631).

6. A disconnector according to claim 4, characterized in that the switching assembly (5) comprises a disconnector main shaft (51), a control member (52) and a connecting member (53);

the isolating switch main shaft (51) is fixedly arranged in an insulating frame body (6), one end of the control piece (52) is rotatably connected with the isolating switch main shaft (51), one end, far away from the isolating switch main shaft (51), of the control piece (52) is rotatably connected with the connecting piece (53), and one end, far away from the isolating switch main shaft (51), of the connecting piece (53) is fixedly connected with the movable cutter head (2);

the isolating switch main shaft (51) drives the movable cutter head (2) to close or move away from the static contact (3).

7. The isolating switch according to claim 6, wherein a protective shell (54) is fixedly arranged on the connecting piece (53), and the protective shell (54) covers the outer side wall of the movable blade.

8. An environment-friendly ring main unit breaker comprises the disconnecting switch according to any one of claims 1 to 7, wherein a pull rod (81) is arranged on a movable conductive end of an arc extinguish chamber (1), a flexible connection (82) is fixedly arranged on the pull rod (81), and a connection busbar is fixedly arranged on the breaker;

the upper transmission of pull rod (81) is provided with circuit breaker main shaft (8), circuit breaker main shaft (8) control flexible coupling (82) with connect the circuit break-make between the female row.

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