CN115863103A

CN115863103A - Pole-mounted circuit breaker with built-in isolating switch

Info

Publication number: CN115863103A
Application number: CN202211622187.XA
Authority: CN
Inventors: 赵约翰
Original assignee: People Electric Technology Co ltd
Current assignee: People Electric Technology Co ltd
Priority date: 2022-12-16
Filing date: 2022-12-16
Publication date: 2023-03-28

Abstract

The invention discloses a pole-mounted circuit breaker with a built-in isolating switch, which comprises three-phase insulating boxes in an enclosed box body, wherein a direct-acting circuit breaker and a rotary isolating switch are arranged in each phase insulating box, the direct-acting circuit breaker comprises a movable contact rod, a vacuum arc extinguish chamber and a static contact rod, the rotary isolating switch comprises a left switch seat, a disconnecting link and a right switch seat, a transmission mechanism comprises a synchronizing shaft, an output connecting lever, an insulating pull rod, an inclined track and a roller, the inclined track and the roller are positioned on the same side, and can be in rolling fit after the movable contact rod and the static contact rod are separated, so that the disconnecting link is separated from the right switch seat. According to the invention, the movable contact rod is controlled to be switched off, the conductive disc and the conductive spring on the sliding cylinder are separated again after the movable contact rod is switched off, and finally, the inclined rail on the sliding cylinder pushes the roller on one side of the disconnecting link to move so as to drive the disconnecting link to be opened, so that the switching-off of the isolating switch is realized, and the problem of electric spark/electric arc phenomenon generated when the isolating switch is switched off due to insufficient arc extinguishing distance or linkage sliding is solved.

Description

Pole-mounted circuit breaker with built-in isolating switch

Technical Field

The invention relates to the technical field of vacuum circuit breakers, in particular to a pole-mounted circuit breaker with a built-in isolating switch.

Background

Pole breakers refer to circuit breakers that are installed and operated on electrical poles. The research level of the strength and the manufacturing technology of various circuit breakers have been developed greatly, the vacuum circuit breaker is not only limited to a medium-voltage power grid but also developed towards the direction of high voltage and large capacity, and the sulfur hexafluoride circuit breaker has many advantages such as strong opening capacity, more continuous opening and closing times, frequent operation, low operation noise, no fire hazard and the like, thereby being a good oilless device. The isolating switch is widely used in an electric power system, but is influenced by factors such as environmental pollution, manufacturing process, maintenance management and the like, the isolating switch has the problems of serious corrosion, difficult transmission, poor removal, breakage of porcelain bottles, poor sealing and the like in the operation process, serious potential safety hazards are generated in the electric power operation, and meanwhile, a large amount of manpower and material resources are required to be invested to maintain the isolating switch. A pole-mounted circuit breaker with a built-in isolating switch is disclosed in the chinese patent with publication number CN112216550A, belonging to the technical field of power generation, power transformation or power distribution. The circuit breaker switch, the isolating switch and the transmission mechanism thereof are arranged in the same sealed box body, wherein the circuit breaker switch comprises an arc extinguish chamber, an arc extinguish chamber static end copper guide rod and a contact spring assembly, the isolating switch comprises a moving contact and a static contact, the transmission mechanism comprises a synchronizing shaft, an output connecting lever, an insulating pull rod and a rotating assembly, and the whole main loop is loaded in an insulating box. The invention can realize the quick mechanical linkage of the breaker and the isolation knife and has the condition of realizing the quick reclosing function. The defects are as follows: the isolating switch is linked with the vacuum circuit breaker, and when the vacuum arc extinguish chamber is opened, the moving contact and the static contact of the isolating switch slide relatively, so that the phenomenon of electric sparks is easy to occur, the abrasion of the isolating switch is aggravated, and the service life of the isolating switch is shortened.

Disclosure of Invention

The pole-mounted circuit breaker with the built-in isolating switch is good in opening and closing sequence and prolongs the service life of the isolating switch.

The technical scheme adopted by the invention for solving the technical problems is as follows: a pole-mounted circuit breaker with built-in isolating switches comprises three-phase insulating boxes in an enclosed box body, wherein a direct-acting circuit breaker and a rotary isolating switch are arranged in each phase insulating box; the two sides of the three-phase insulation box are respectively provided with three incoming pole columns and three outgoing pole columns, the direct-acting circuit breaker comprises a movable contact rod, a vacuum arc-extinguishing chamber and a static contact rod, one end of the vacuum arc-extinguishing chamber is fixedly provided with the static contact rod, the static contact rod is electrically connected with the outgoing pole columns, the other end of the vacuum arc-extinguishing chamber is connected with the movable contact rod in a sliding and sealing manner, the inner end of the movable contact rod can be contacted with or separated from the inner end of the static contact rod when the movable contact rod slides left and right, the outer end of the movable contact rod is provided with a sliding cylinder, arc-extinguishing gas is arranged in the sliding cylinder, the rotary isolating switch comprises a left switch seat, a disconnecting link and a right switch seat, the left switch seat is electrically connected with the incoming pole, one end of the disconnecting link is rotatably connected with the left switch seat, a reset spring is arranged between the left switch seat and the disconnecting link, the other end of the disconnecting link can be mutually contacted with or separated from the right switch seat when the disconnecting link rotates, the right brake seat is fixedly connected with a conductive rod, the conductive rod is in insulated sliding sealing connection with the sliding cylinder, a conductive disc is fixedly arranged at the inner end of the conductive rod, the conductive disc is provided with an air hole, an insulating shielding cylinder is fixedly arranged on the inner cavity of the sliding cylinder, the insulating shielding cylinder is connected with a conductive disc in a sliding way, a conductive spring and an insulating spring are respectively arranged between the left side and the right side of the conductive disc and the sliding cylinder, the transmission mechanism comprises a synchronizing shaft, an output crank arm, an insulating pull rod, an inclined track and a roller wheel, the output crank arm is fixedly arranged on the synchronizing shaft, one end of the insulating pull rod is rotatably connected with the output crank arm, the other end of the insulating pull rod is rotatably connected with the sliding cylinder, the inclined rail is fixedly arranged at one side of the outer end of the sliding cylinder, the roller is fixedly arranged at the inner side of the disconnecting link, the inclined rail and the roller are positioned on the same side, and the movable contact rod and the fixed contact rod can be in rolling fit after being separated, so that the disconnecting link is separated from the right switch seat.

Further perfect, the fixed heat dissipation gas pitcher that is provided with on the lateral wall of box, the impeller shaft is installed in the rotation of heat dissipation gas pitcher inner wall, and impeller shaft connection rotating electrical machines communicates through first insulating hose between heat dissipation gas pitcher and the sliding cylinder, be equipped with on the outer wall of box with heat dissipation gas pitcher fixed connection's fin.

Further perfect, vacuum interrupter's outside is equipped with insulating gas hood, the both ends and the vacuum interrupter both ends fixed connection of insulating gas hood, communicates through insulating hard tube between insulating gas hood and the heat dissipation gas pitcher.

Further perfection, the insulating air hood is communicated with the sliding cylinder through a second insulating hose.

Further perfection, be equipped with temperature sensor, release valve and inflation valve on the heat dissipation gas pitcher, the inflation valve is connected high-pressure gas bomb.

Further perfection, be equipped with the main shield cover in the vacuum interrupter, the upper and lower both sides inner wall of main shield cover respectively is equipped with a permanent magnet, and the heteropole of two upper and lower permanent magnets sets up relatively.

Further perfection, the inner walls of the front side and the rear side of the main shielding cover are respectively provided with an arc extinguishing grid assembly.

Further perfecting, arc extinguishing bars subassembly has a plurality of blocks and constitutes with the sub-arc extinguishing bars of an arc extinguishing guipure series connection, for fixed connection between arc extinguishing guipure and the sub-arc extinguishing bars, be sliding connection between sub-arc extinguishing bars and the main shield cover, fixedly connected with insulating driving lever between arc extinguishing guipure left end and the movable contact link, be fixed connection between arc extinguishing guipure right-hand member and the main shield cover.

Compared with the prior art, the invention has the beneficial effects that: in the switching-off process, the sliding cylinder of the direct-acting type circuit breaker is controlled by the transmission mechanism to drive the movable contact rod to switch off, the conductive disc on the sliding cylinder further moves after the movable contact rod is switched off and then is separated from the conductive spring again, the arc extinguishing distance of the circuit breaker is improved, the arc extinguishing capability is enhanced, finally, the inclined track on the sliding cylinder pushes the roller on one side of the disconnecting link to move, the disconnecting link is driven to be opened, the switching-off of the isolating switch is realized, the problem of electric spark/electric arc phenomenon generated when the isolating switch is switched off due to insufficient arc extinguishing distance or linkage sliding is solved, and the service life of the isolating switch is prolonged; in the switching-on process, the disconnecting link, the conductive disc and the movable contact rod are sequentially switched on, so that the safety is good. The on-off sequence of the isolating switch is good, the service life of the isolating switch is prolonged, and the installation performance of equipment is improved.

Drawings

FIG. 1 is a schematic structural diagram of the present invention in a closing state;

FIG. 2 is an enlarged schematic view of the sliding cylinder of FIG. 1;

FIG. 3 is a schematic structural diagram of the present invention in the open state;

description of reference numerals: 1. the high-voltage switch comprises a box body, 11, a three-phase insulating box, 12, an incoming pole, 13, an outgoing pole, 14, a radiating gas tank, 141, an impeller shaft, 142, a rotating motor, 143, a first insulating hose, 144, a radiating fin, 145, a temperature sensor, 146, a release valve, 147, an inflation valve, 148, a high-voltage gas storage bottle, 15, an insulating gas hood, 151, an insulating hard tube, 152, a second insulating hose, 2, a direct-acting circuit breaker, 21, a movable contact rod, 22, a vacuum arc extinguish chamber, 23, a stationary contact rod, 24, a sliding cylinder, 25, a main shielding hood, 26, a permanent magnet, 3, a rotary isolating switch, 31, a left brake seat, 32, a knife brake, 33, a right brake seat, 34, a return spring, 35, a conductive rod, 351, a conductive disc, 352, a vent hole, 353, a conductive spring, 354, an insulating spring, 36, an insulating shielding cylinder, 4, a transmission mechanism, 41, a synchronous shaft, 42, an output crank arm, 43, an insulating pull rod, 44, an inclined rail, 45 and a roller.

Detailed Description

The invention will be further described with reference to the accompanying drawings in which:

referring to figures 1-3: the pole-mounted circuit breaker with the built-in isolating switch in the embodiment 1 comprises three-phase insulating boxes 11 in a closed box body 1, wherein a direct-acting circuit breaker 2 and a rotary isolating switch 3 are arranged in each phase insulating box, the direct-acting circuit breaker 2 and the rotary isolating switch 3 are in series connection and asynchronous linkage through a transmission mechanism 4, when the pole-mounted circuit breaker is in a switching-off state and is ready to be switched on, the transmission mechanism 4 firstly pushes the rotary isolating switch 3 to be switched on and then pushes the direct-acting circuit breaker 2 to be switched on, and when the pole-mounted circuit breaker is in a switching-on state and is ready to be switched off, the transmission mechanism 4 firstly pulls the direct-acting circuit breaker to be switched off and then pulls the rotary isolating switch 3 to be switched off; the three-phase insulation box 11 is provided with three incoming poles 12 and three outgoing poles 13 on two sides, the direct-acting circuit breaker 2 comprises a movable contact rod 21, a vacuum arc-extinguishing chamber 22 and a static contact rod 23, one end of the vacuum arc-extinguishing chamber 22 is fixedly provided with the static contact rod 23, the static contact rod 23 is electrically connected with the outgoing poles 13, the other end of the vacuum arc-extinguishing chamber 22 is connected with the movable contact rod 21 in a sliding and sealing manner, the inner end of the movable contact rod 21 can be contacted with or separated from the inner end of the static contact rod 23 when sliding left and right, the outer end of the movable contact rod 21 is provided with a sliding cylinder 24, arc-extinguishing gas is arranged in the sliding cylinder 24, the rotary isolating switch 3 comprises a left switch seat 31, a knife switch 32 and a right switch seat 33, the left switch seat 31 is electrically connected with the incoming poles 12, one end of the knife switch 32 is rotatably connected with the left switch seat 31, a reset spring 34 is arranged between the left switch seat 31, and the other end of the knife switch 32 can be contacted with or separated from the right switch seat 33 when the knife switch 32 rotates, the right brake seat 33 is fixedly connected with a conductive rod 35, the conductive rod 35 is in insulation sliding sealing connection with the sliding cylinder 24, a conductive disc 351 is fixedly installed at the inner end of the conductive rod 35, an air hole 352 is formed in the conductive disc 351, an insulation shielding cylinder 36 is fixedly installed in the inner cavity of the sliding cylinder 24, the insulation shielding cylinder 36 is in sliding connection with the conductive disc 351, a conductive spring 353 and an insulation spring 354 are respectively arranged between the left side and the right side of the conductive disc 351 and the sliding cylinder 24, the transmission mechanism 4 comprises a synchronizing shaft 41, an output crank arm 42, an insulation pull rod 43, an inclined rail 44 and a roller 45, the output crank arm 42 is fixedly installed on the synchronizing shaft 41, one end of the insulation pull rod 43 is rotatably connected with the output crank arm 42, the other end of the insulation pull rod 43 is rotatably connected with the sliding cylinder 24, the inclined rail 44 is fixedly installed on one side of the outer end of the sliding cylinder 24, the roller 45 is fixedly arranged on the inner side of the disconnecting link 32, the inclined rail 44 and the roller 45 are positioned on the same side and can be in rolling fit after the movable contact rod 21 and the fixed contact rod 23 are separated, so that the disconnecting link 32 is separated from the right switch seat 33.

The working principle is as follows: the incoming pole 12 and the outgoing pole 13 are connected to an external high-voltage circuit, the synchronizing shaft 41 is driven by an external operating mechanism to rotate, when the opening operation is executed, the synchronizing shaft 41 drives the output connecting lever 42 to rotate anticlockwise, the output connecting lever 42 pushes the sliding cylinder 24 to move left through the insulating pull rod 43, the movable contact rod 21 moves left along with the sliding cylinder 24 and is separated from the static contact rod 23, a vacuum arc is generated between the movable contact rod 21 and the static contact rod 23, and the vacuum arc is maintained by metal steam evaporated from a contact. When the power frequency current passes through zero, the metal steam stops evaporating, and simultaneously, because the plasma of the vacuum arc is diffused to the periphery rapidly, the arc is extinguished, the contact gap is changed into an insulator rapidly, and then the current is cut off. When a vacuum arc is generated, the conductive rod 35 and the conductive disc 351 move to the right relative to the sliding cylinder 24, the conductive spring 353 extends to be continuously contacted with the conductive disc 351 and finally separated, the arc extinguishing distance of the circuit breaker is increased, the arc extinguishing capacity is enhanced, the insulating property inside the sliding cylinder 24 can be improved by arc extinguishing gas, the insulating spring 354 compresses and separates to realize the insulation between the right side of the conductive disc 351 and the sliding cylinder 24, finally, the inclined rail 44 on the sliding cylinder 24 pushes the roller 45 on one side of the disconnecting link 32 to move, the disconnecting link 32 is driven to be opened, the opening of the isolating switch is realized, the problem of the phenomenon of electric spark/electric arc generated when the isolating switch is opened due to insufficient arc extinguishing distance or linked sliding is solved, and the service life of the isolating switch is prolonged; when the switching-off operation is executed, the synchronizing shaft 41 drives the output crank arm 42 to rotate clockwise, the output crank arm 42 pushes the sliding cylinder 24 to move right through the insulating pull rod 43, and the disconnecting link, the conductive disc and the movable contact rod are sequentially switched on, so that the switching-on process is realized, and the safety is good. The on-off sequence of the isolating switch is good, the service life of the isolating switch is prolonged, and the installation performance of equipment is improved.

Embodiment 2 differs from embodiment 1 only in that a heat radiation gas tank 14 is fixedly arranged on the side wall of the box body 1, an impeller shaft 141 is rotatably arranged on the inner wall of the heat radiation gas tank 14, the impeller shaft 141 is connected with a rotating motor 142, the heat radiation gas tank 14 is communicated with the sliding cylinder 24 through a first insulating hose 143, and a cooling fin 144 fixedly connected with the heat radiation gas tank 14 is arranged on the outer wall of the box body 1. The rotary motor 142 drives the impeller shaft 141 to rotate, so that the arc extinguishing gas in the heat dissipation gas tank 14 and the arc extinguishing gas in the sliding cylinder 24 can exchange gas, the insulating property in the sliding cylinder 24 is kept, heat exchange can be performed when the gas flows through the position of the heat dissipation fin 144, and the arc extinguishing gas can be guaranteed to have a lower temperature.

Embodiment 3, on the basis of embodiment 2, the outside of the vacuum interrupter 22 is provided with the insulating gas hood 15, two ends of the insulating gas hood 15 are fixedly connected with two ends of the vacuum interrupter 22, and the insulating gas hood 15 is communicated with the heat dissipation gas tank 14 through the insulating hard tube 151. A large amount of heat can be produced when electric arc produces in the vacuum interrupter 22, and the heat can flow and dispel the heat in the heat dissipation gas pitcher 14 after being absorbed by the gas in the insulating gas hood 15 to reduce the temperature to vacuum interrupter 22, improve vacuum interrupter 22's arc extinguishing ability. The insulating gas hood 15 is communicated with the sliding cylinder 24 through a second insulating hose 152, so that a gas circulation loop can be further established, and the heat dissipation capacity is improved.

Embodiment 4, on the basis of embodiment 2, the heat dissipation gas tank 14 is provided with a temperature sensor 145, a release valve 146 and an inflation valve 147, and the inflation valve 147 is connected with a high-pressure gas tank 148. The temperature sensor 145 may detect the temperature of the gas within the heat sink canister and feed it back to the controller, which in turn adjusts the rotational speed of the rotary motor 142. The air release valve 146 can be opened to release air when the air pressure in the heat dissipation air tank 14 is too high, so that the temperature of the heat dissipation air tank is quickly reduced, and the safety performance is improved. When the charging valve 147 is opened, the high-pressure gas cylinder 148 can supply new arc extinguishing gas to the heat dissipation gas cylinder 14, the arc extinguishing gas is sulfur hexafluoride, and the gas is colorless, tasteless, nontoxic, noncorrosive, non-explosive at normal temperature and normal pressure, and has a density about 5 times of air.

Embodiment 5 is different from embodiment 1 only in that a main shield 25 is provided in the vacuum interrupter 22, a permanent magnet is provided on each of upper and lower inner walls of the main shield 25, and the upper and lower permanent magnets are oppositely arranged to form a directional magnetic field, and when an electric arc is generated, the magnetic field generates an ampere force to the electric arc, thereby promoting the breaking of the electric arc. The inner walls of the front side and the rear side of the main shielding case 25 are respectively provided with an arc-extinguishing grid assembly, so that a large arc can be divided into small arcs when colliding, and the arc-extinguishing efficiency is improved.

Embodiment 6 is based on embodiment 5, the arc chute assembly includes a plurality of sub-arc chutes connected in series by an arc chute mesh, the arc chute mesh is fixedly connected with the sub-arc chutes mesh, the sub-arc chutes mesh is slidably connected with the main shield, the insulating shift lever is fixedly connected between the left end of the arc chute mesh and the movable contact rod, and the right end of the arc chute mesh is fixedly connected with the main shield. When the movable contact rod is opened, the arc extinguishing net belt is pulled by the insulating deflector rod, and the sub arc extinguishing grids are pulled apart, so that the arc extinguishing grid can be further improved in the arc segmenting capacity. When the movable contact rod is switched on, the insulating deflector rod pulls the arc extinguishing net belt to gather the sub arc extinguishing grids together.

While the invention has been 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 scope of the appended claims.

Claims

1. A pole-mounted circuit breaker with built-in isolating switches comprises three-phase insulating boxes (11) in a closed box body (1), wherein a direct-acting circuit breaker (2) and a rotary isolating switch (3) are arranged in each phase insulating box, when the pole-mounted circuit breaker is in a switching-off state and is ready to be switched on, a transmission mechanism (4) firstly pushes the rotary isolating switch (3) to be switched on and then pushes the direct-acting circuit breaker (2) to be switched on, and when the pole-mounted circuit breaker is in a switching-on state and is ready to be switched off, the transmission mechanism (4) firstly pulls the direct-acting circuit breaker to be switched off and then pulls the rotary isolating switch (3) to be switched off; the method is characterized in that: the three-phase circuit breaker is characterized in that three wire inlet poles (12) and three wire outlet poles (13) are respectively arranged on two sides of the three-phase insulating box (11), the direct-acting circuit breaker (2) comprises a movable contact rod (21), a vacuum arc-extinguishing chamber (22) and a static contact rod (23), the static contact rod (23) is fixedly installed at one end of the vacuum arc-extinguishing chamber (22), the static contact rod (23) is electrically connected with the wire outlet poles (13), the movable contact rod (21) is connected with the other end of the vacuum arc-extinguishing chamber (22) in a sliding and sealing manner, the inner end of the movable contact rod (21) can be in mutual contact with or separated from the inner end of the static contact rod (23) when the movable contact rod (21) slides left and right, a sliding cylinder (24) is arranged at the outer end of the movable contact rod (21), arc-extinguishing gas is arranged in the sliding cylinder (24), the rotary isolating switch (3) comprises a left switch seat (31), a knife switch (32) and a right switch seat (33), the left switch seat (31) is electrically connected with the wire inlet poles (12), one end of the left switch seat (32) in a rotating manner, a reset spring (34) is arranged between the left switch seat (351) and the right switch seat (35) and the other end of the sliding cylinder (35) is fixedly connected with the right switch seat (35) when the sliding cylinder (35) or the sliding cylinder (35), be equipped with bleeder vent (352) on conducting disc (351), fixed mounting has an insulating shielding section of thick bamboo (36) on the inner chamber of sliding cylinder (24), insulating shielding section of thick bamboo (36) and conducting disc (351) sliding connection, is equipped with between the left and right sides of conducting disc (351) and sliding cylinder (24) respectively conducting spring (353) and insulating spring (354), drive mechanism (4) include synchronizing shaft (41), output turning arm (42), insulating pull rod (43), inclined rail (44) and gyro wheel (45), output turning arm (42) fixed mounting is on synchronizing shaft (41), and the one end and output turning arm (42) of insulating pull rod (43) rotate to be connected, and the other end and sliding cylinder (24) of insulating pull rod (43) rotate to be connected, inclined rail (44) fixed mounting is in one side of sliding cylinder (24) outer end, gyro wheel (45) fixed mounting is in the inboard of switch (32), inclined rail (44) and gyro wheel (45) are located same side and both can roll the cooperation with the stationary brake (33) after movable contact rod (21) and right side contact rod (23) separation.

2. The pole-mounted circuit breaker with the built-in isolating switch of claim 1, wherein: the utility model discloses a heat dissipation air tank, including box (1), impeller shaft (141), rotating electrical machines (142) are connected to impeller shaft (141), communicate through first insulating hose (143) between heat dissipation air tank (14) and sliding cylinder (24), be equipped with on the lateral wall of box (1) and dispel the heat gas jar (14), impeller shaft (141) is installed in heat dissipation air tank (14) inner wall rotation, fin (144) with heat dissipation air tank (14) fixed connection are equipped with on the outer wall of box (1).

3. The pole-mounted circuit breaker with the built-in isolating switch as claimed in claim 2, wherein: the outside of vacuum interrupter (22) is equipped with insulating gas hood (15), and the both ends and the vacuum interrupter (22) both ends fixed connection of insulating gas hood (15), communicate through insulating hard tube (151) between insulating gas hood (15) and heat dissipation gas pitcher (14).

4. The pole-mounted circuit breaker with built-in disconnector of claim 3, characterized in that: the insulating air hood (15) is communicated with the sliding cylinder (24) through a second insulating hose (152).

5. The pole-mounted circuit breaker with the built-in isolating switch as claimed in claim 2, wherein: and a temperature sensor (145), an air release valve (146) and an inflation valve (147) are arranged on the heat dissipation air tank (14), and the inflation valve (147) is connected with a high-pressure air storage bottle (148).

6. The pole-mounted circuit breaker with an internal isolating switch of claim 1, wherein: a main shielding cover (25) is arranged in the vacuum arc extinguish chamber (22), the inner walls of the upper side and the lower side of the main shielding cover (25) are respectively provided with a permanent magnet, and the different poles of the upper permanent magnet and the lower permanent magnet are oppositely arranged.

7. The pole-mounted circuit breaker with built-in disconnector of claim 6, characterized in that: the inner walls of the front side and the rear side of the main shielding case (25) are respectively provided with an arc extinguishing grid assembly.