CN205029239U - Insulating looped netowrk cabinet of nitrogen gas - Google Patents

Abstract

The utility model is a nitrogen insulated ring network cabinet, which is characterized in that it includes an inflatable unit 1, a cabinet body 2, and a standard cable head 3, wherein the standard cable head 3 is installed on the cable connection cone of the inflatable unit 1, and the inflatable unit 1 is installed on the Upper rear part in cabinet 2. Advantages: Since the vacuum interrupter is used as the component for breaking the current, no arc will be generated, no explosion or harmful gas will be produced. The isolating switch itself has three working positions: closing, opening (isolation), and grounding, which greatly simplifies the structure of the switch. Nitrogen is used as the insulating medium, no harmful substances will be produced during the working process, and all parts can be recycled after reaching the service life, which greatly improves the environmental protection of the product and meets the needs of environmental protection. Since all charged bodies are installed in a sealed box, they will not be affected by the external environment such as water vapor and dust on the electrical performance of the ring main unit. Reduce equipment maintenance and prolong service life.

Description

Nitrogen insulated ring network cabinet

technical field

The utility model is a novel gas-insulated ring network cabinet. It belongs to the technical field of high-voltage power distribution equipment.

technical background

At present, most gas-insulated ring network cabinets use SF6 gas as the insulation or breaking medium of high-voltage live parts. Since the SF6 gas will decompose and produce toxic gas after the arc is broken, if leakage occurs, it may endanger personal safety. And SF6 gas cannot be recycled after the product life ends. In addition, according to the "Kyoto Protocol", as the insulation or breaking medium of the gas-insulated ring main unit, SF6 gas is clearly listed as one of the greenhouse gases, and its use is required to be reduced.

Contents of the invention

The utility model proposes a new type of nitrogen-filled insulated ring network cabinet, which aims to overcome the above-mentioned defects in the prior art, and has the advantages of small size, environmental protection, function integration, high reliability, maintenance-free, full insulation, etc. .

The technical solution of the utility model: its structure includes an inflatable unit 1, a cabinet body 2, and a standard cable head 3, wherein the standard cable head 3 is installed on the inflatable unit 1 in the cabinet body 2 by screws, and the inflatable unit 1 is connected by screws and cabinets. Body 2 is connected and installed on the upper rear of the cabinet.

The utility model has the advantages that since the vacuum interrupter is used as the component for breaking the current, no electric arc will be generated, and no explosion or harmful gas will be produced. The isolating switch itself has three working positions: closing, opening (isolation), and grounding, which greatly simplifies the structure of the switch. Nitrogen is used as the insulating medium, no harmful substances will be produced during the working process, and all parts can be recycled after reaching the service life, which greatly improves the environmental protection of the product and meets the needs of environmental protection. Since all charged bodies are installed in a sealed box, they will not be affected by the external environment such as water vapor and dust on the electrical performance of the ring main unit. Reduce equipment maintenance and prolong service life.

Description of drawings:

Accompanying drawing 1 is the structural drawing of nitrogen insulated ring network cabinet.

Accompanying drawing 2 is the side view of Fig. 1.

Accompanying drawing 3 is the structural diagram of the gas charging unit of the nitrogen insulated ring network cabinet.

In the figure, 1 is the inflatable unit, 2 is the cabinet body, 3 is the standard cable head, 4 is the bus extension cone, 5 is the sealing box body, 6 is the isolating switch assembly, 7 is the solid-sealed pole, 8 is the connecting conductor, 9 Is the explosion-proof membrane, 10 is the cable connection cone, 11 is the operating mechanism, 12 is the static contact of the isolating knife closing, 13 is the insulating cover, 14 is the moving blade of the isolating switch, 15 is the operating spindle of the isolating switch, 16 is the vacuum interrupter Static end contact, 17 is soft connection, 18 is moving end contact of vacuum interrupter, 19 is insulating screw, 20 is silicone rubber sleeve, 21 is vacuum interrupter, 22 is transmission arm, 23 is vacuum arc extinguisher Chamber moving end screw, 24 is the contact spring assembly, 25 is the drive shaft of the vacuum interrupter, 26 is the grounding contact of the isolation switch.

detailed description

Referring to the accompanying drawing 1, the nitrogen insulated ring network cabinet has a structure including an inflatable unit 1, a cabinet body 2, and a standard cable head 3, wherein the standard cable head 3 is installed on the cable connection cone of the inflatable unit 1, and the inflatable unit 1 is installed by screws In the upper rear part of cabinet 2.

Referring to accompanying drawings 2 and 3, the structure of the inflatable unit 1 is as follows: the isolating switch assembly 6, the solid-sealed pole 7, the connecting conductor 8, and the cable connecting cone 10 are installed in a sealed box 5 welded by stainless steel plates, and 3 busbars are extended The cone 4 is installed on the upper part of the sealed box body 5 in the order of front, middle and rear, and the three cable connection cones 10 are installed in the front lower part of the welding gas box 5 in the order of left, middle and right. The contact 12, the protective cover 13 on the bus extension cone 4, the explosion-proof membrane 9 is installed on the bottom of the sealed box 5, and the front end of the isolating switch operating spindle 15 protruding from the welding gas box 5 is connected to the output end of the isolating switch mechanism of the operating mechanism 11 The rear end of the isolating switch operating main shaft 15 is fixed on the mounting plate of the solid-sealed pole 7, and the interior of the solid-sealed pole 7 is cast with the static end contact 16 of the vacuum interrupter, the vacuum interrupter 21 and the dynamic vacuum interrupter. Terminal contact 18.

The busbar expansion cone 4 is made of epoxy resin casting, and a part of the cone of the busbar expansion cone 4 leaks outside the sealed box body 5, which is used for connecting conductive circuits when assembling more than 2 sets of ring network cabinets. Another part of the cone 4 is inside the sealed box 5 .

The protective cover 13 is formed by pouring epoxy resin, and is placed on the busbar extension cone 4, which separates the three-phase isolating knife closing static contacts 12 and the welding box 5 to form a protective cover. to increase the insulation performance.

The isolating switch assembly 6 is composed of a three-phase insulated isolating switch operating main shaft 15 and two pairs of three pairs of isolating switch movable blades 14, wherein there are three cavity bosses on the isolating switch operating main shaft 15, each Two isolating switch moving blades 14 are installed inside each boss, and one end of each two isolating switch moving blades 14 is poured on the static end contact 16 of the vacuum interrupter on the solid-sealed pole 7 through a pivot pin, and can be used as The static end contact 16 of the vacuum interrupter rotates as the center of rotation, and the other ends of the movable blades 14 of every two isolating switches are connected with the isolating knife closing static contact 12 and the isolating switch grounding contact 26 respectively with the rotation.

The solid-sealed pole 7 is formed by casting epoxy resin, and one end of the static end contact 16 of the vacuum interrupter inside the solid-sealed pole 7 is fixed to the static end of the vacuum interrupter 21 by screws, and the vacuum interrupter The other end of the static end contact 16 is connected with the movable blade 14 of the isolating switch. The solid-sealed pole 7 is installed on the mounting plate of the sealed box 5 in the order of front, middle and rear. In the middle of the arm 22, one end of the solid-sealed pole 7 is connected to the movable end screw 23 of the vacuum interrupter, and the other end of the solid-sealed pole 7 is connected to the contact spring assembly 24, and a vacuum is installed on the mounting plate of the solid-sealed pole 7. The drive shaft 25 of the arc extinguishing chamber is connected to the grounding contact 26 of the isolating switch. When the moving blade 14 of the isolating switch engages with the grounding contact 26 of the isolating switch, the conductive part is grounded.

The movable end contact 18 of the vacuum interrupter is cast on the part of the solid-sealed pole 7 close to the movable end of the vacuum interrupter 21, and the end face of the movable end of the vacuum interrupter 21 is fixed to one end of the soft connection 17 by the movable end screw 23 of the vacuum interrupter , the other end of the soft connection 17 is fixed to one end of the moving end contact 18 of the vacuum interrupter by screws.

There are 3 connecting conductors 8, which are made of copper rods, and one end of the 3 connecting conductors is fastened to the moving end contact of the vacuum interrupter of the solid-sealed pole 7 through the insulating screw 19 in the order of front, middle and back. 18, and put a silicone rubber sleeve 20 on the outside of the three connecting conductors, the other end of the moving end contact 18 of the vacuum interrupter is fastened to one end of the cable connection cone 10 through an insulating screw 19, and put it on the outside Another silicone rubber sheath 20, two silicone rubber sheaths 20 is cast from silicon rubber, wrapping the outer side of the connecting conductor 8 to enhance the insulation strength.

The cable connection cone 10 is poured from epoxy resin, and a copper rod with threads at both ends is poured inside. The conical side of the cable connection cone 10 leaks outside the sealed box 5, which is different from the standard cable head 3 connection, the inner side of the sealed box 5 is connected to the A, B, C three-phase connecting conductors 8 respectively.

The explosion-proof membrane 9 installed at the bottom of the gas box welding 5, when there is an internal short circuit fault, the air pressure inside the sealed box rises, and when the air pressure reaches the specified value, the explosion-proof membrane opens by itself, and the internal gas can be released through here to reduce the internal pressure. Avoid box explosion.

The outer front side of the sealed box 5 is fixed with the operating mechanism 11 by screws, and the circuit breaker output end of the operating mechanism 11 is connected with the transmission spindle 25 of the vacuum interrupter and drives it to rotate; the three-station output end is connected with the isolation switch operating spindle 15 , and drive it to rotate.

The contact spring assembly 24 is composed of compression springs, insulators, and rod-end joint bolts. One end of the contact spring assembly 24 is connected to the transmission crank arm 22, and the other end of the contact spring assembly 24 is connected to the transmission spindle 25 of the vacuum interrupter. , wherein the compression spring provides pressure to the vacuum interrupter 21 when closing to ensure its reliable operation.

Referring to accompanying drawing 3, the working state of the main circuit of the inflatable unit 1 is: the moving blade 14 of the isolating switch meshes with the static contact 12 of the isolating knife closing, and connects the bus extension cone 4 and the static end contact 16 of the vacuum interrupter. The conductive circuit consists of the isolating knife closing static contact 12 on the bus extension cone 4, the isolating switch moving blade 14, the static end contact 16 of the vacuum interrupter, the vacuum interrupter 21, the soft connection 17, and the moving end of the vacuum interrupter Contact 18, connecting conductor 8, cable connecting cone 10; the action sequence is: firstly operate the operating mechanism 11 isolating switch output to drive the isolating switch operating spindle 15 to rotate, and then drive the isolating switch moving blade 14 to close the isolating knife and make static contact The head 12 is rotated and engaged, and the isolating switch is in the closed position; then the operating mechanism 11 is operated at the output end of the circuit breaker, and then drives the transmission spindle 25 of the vacuum interrupter, the contact spring assembly 24, the transmission crank arm 22, and the vacuum interrupter. The moving end screw 23 of the arc extinguishing chamber moves to the closing position; the moving end screw 23 of the vacuum interrupting chamber drives the vacuum interrupting chamber 21 to close, the circuit breaker is connected, and the working circuit is completed;

The grounding state of the main circuit of the inflatable unit 1 is: the movable blade 14 of the isolating switch is engaged with the grounding contact 26 of the isolating switch, the grounding contact 26 of the isolating switch is connected with the static end contact 16 of the vacuum interrupter, and the conductive circuit is connected by the grounding contact of the isolating switch. Head 26, isolating switch movable blade 14, vacuum interrupter static end contact 16, vacuum interrupter 21, soft connection 17, vacuum interrupter movable end contact 18, connecting conductor 8, cable connection cone 10; its action The sequence is: first operate the operating mechanism 11 isolating switch output to drive the isolating switch operating spindle 15 to rotate, and then drive the isolating switch movable blade 14 to rotate to the isolating switch grounding contact 26 and make it mesh, and the isolating switch is in the grounding position; Operate the operating mechanism 11 circuit breaker output end, and then drive the vacuum interrupter transmission spindle 25, the contact spring assembly 24, the transmission crank arm 22, the vacuum interrupter movable end screw 23 to move to the closing position; the vacuum interrupter dynamic The end screw 23 drives the vacuum interrupter 21 to close, and the circuit breaker is connected. The ground loop is complete.

The three-position isolating switch adopted in the present invention greatly simplifies the structure of the switch, and all the breaking and closing of the normal working current or short-circuit current and the closing and closing of the grounding fault are all undertaken by the vacuum interrupter, and there will be no Arc, explosion and other hazards. In addition, all charged bodies are placed in the welding gas box 5, and the interfaces are sealed and connected to avoid the exposure of charged bodies. It has the advantages of small size, environmental protection, functional integration, high reliability, maintenance-free, and full insulation.

Claims (9)

1. Nitrogen insulated ring network cabinet, which is characterized by including a nitrogen filling unit, a cabinet body, and a standard cable head, wherein the standard cable head is installed on the cable connection cone of the nitrogen filling unit, and the nitrogen filling unit is installed on the rear of the cabinet body through screws upper part. 2. The nitrogen insulated ring network cabinet according to claim 1, characterized in that the structure of the nitrogen filling unit is: the disconnector assembly, the solid-sealed pole, the connecting conductor, and the cable connecting cone are installed on a stainless steel plate welded Inside the sealed box, the 3 busbar expansion cones are installed on the upper part of the sealed box in the order of front, middle and rear, and the 3 cable connection cones are installed in the front and lower part of the welding gas box in the order of left, middle and right, and the inner pouring isolation knife of the busbar expansion cone Closing static contact, protective cover over the bus bar extension cone, explosion-proof film installed on the bottom of the sealed box, and the front end of the isolating switch operating spindle extending out of the welding gas box is connected to the output end of the isolating switch mechanism of the operating mechanism; the isolating switch is operated The rear end of the main shaft is fixed on the mounting plate of the solid-sealed pole, and the static contact of the vacuum interrupter, the vacuum interrupter and the moving contact of the vacuum interrupter are poured inside the solid-sealed pole. 3. The nitrogen insulated ring main unit according to claim 2, characterized in that the bus extension cone is cast from epoxy resin, a part of the taper of the bus extension cone leaks outside the sealed box, and the bus The other part of the expansion cone is inside the sealed box. 4. The nitrogen insulated ring network cabinet according to claim 2, wherein the isolating switch assembly is composed of a three-phase integrated insulated isolating switch operating spindle and 2 pairs of 3 pairs of isolating switch moving blades, Among them, there are three cavity bosses on the operating shaft of the isolating switch, and two moving blades of the isolating switch are installed inside each boss, and one end of each two moving blades of the isolating switch passes through the shaft pin and the vacuum arc-extinguishing cast on the solid-sealed pole. On the static end contact of the chamber, the other end of the moving blade of every two isolating switches is connected with the closing static contact of the isolating knife and the grounding contact of the isolating switch respectively with the rotation. 5. The nitrogen insulated ring network cabinet according to claim 2, characterized in that the solid-sealed pole is casted by epoxy resin, and one end of the static end contact of the vacuum interrupter inside the solid-sealed pole passes through The screw is fixed on the static end of the vacuum interrupter, and the other end of the contact at the static end of the vacuum interrupter is connected with the moving blade of the isolator. The sealed pole is installed in the middle of the transmission crank arm through the shaft pin, one end of the solid-sealed pole is connected with the moving end screw of the vacuum interrupter, the other end of the solid-sealed pole is connected with the contact spring assembly, and the mounting plate of the solid-sealed pole The drive spindle of the vacuum interrupter and the grounding contact of the isolating switch are installed on it. The contact spring assembly is composed of a compression spring, an insulator, and a rod-end joint bolt. One end of the contact spring assembly is connected to the transmission crank arm, and the other end of the contact spring assembly One end is connected with the drive shaft of the vacuum interrupter. 6. The nitrogen insulated ring main unit according to claim 2, characterized in that the contact of the movable end of the vacuum interrupter is cast on the part of the solid-sealed pole close to the movable end of the vacuum interrupter, and the contact of the vacuum interrupter One end of the soft connection is fixed on the end face of the moving end by the moving end screw of the vacuum interrupter, and the other end of the soft connection is fixed on one end of the moving end contact of the vacuum interrupter by screws. 7. The nitrogen insulated ring network cabinet according to claim 2, characterized in that there are 3 connecting conductors made of copper rods, and one end of the 3 connecting conductors is tightened by insulating screws in the order of front, middle and back. One end of the movable end contact of the vacuum interrupter fixed on the solid-sealed pole, and a silicone rubber sleeve is put on the outside of the three connecting conductors, and the other end of the movable end contact of the vacuum interrupter is fastened to the The cable is connected to one end of the cone, and another silicone rubber sleeve is put on the outside of the moving end contact of the vacuum interrupter. The two silicone rubber sleeves are made of silicone rubber and wrap the outside of the connecting conductor. 8. The nitrogen insulated ring network cabinet according to claim 2, characterized in that the cable connection cone is cast from epoxy resin, and a copper rod with threads at both ends is cast inside the cable connection cone, and the cable connection One side of the taper leaks out of the sealed box and is connected to the standard cable head, and the inner side of the sealed box is connected to the three-phase connecting conductors of A, B, and C respectively. 9. The nitrogen insulated ring network cabinet according to claim 2, characterized in that the bottom of the sealed box is equipped with an explosion-proof film, the front and outside of the sealed box are fixed with the operating mechanism by screws, and the circuit breaker output of the operating mechanism is connected to the Vacuum interrupter drive shaft connection.