CN107068470B - A kind of double-fracture disconnecting switch with ground connection linkage - Google Patents

Abstract

A kind of double-fracture disconnecting switch with ground connection linkage, including shell, double-fracture switching device, disconnecting switch driving device, Grunding switch gear device, earthing switch driving device, earthing switch transmission mechanism, linkage；The double-fracture switching device installation inside housings, the synchroswitching or separating brake of both sides fracture is realized by disconnecting switch driving device；The Grunding switch gear device is mounted on shell and carries out ground connection folding control to the double-fracture switching device, and combined floodgate or separating brake are realized by earthing switch driving device and earthing switch transmission mechanism；The linkage is connect with disconnecting switch driving device, earthing switch driving device respectively, and when double-fracture switching device being made to be in gate-dividing state, Grunding switch gear device could close a floodgate；Or when Grunding switch gear device being made to be in gate-dividing state, double-fracture switching device could close a floodgate.

Description

A double-break isolating switch with grounding linkage

technical field

The invention relates to the equipment field of converter stations/substations with a voltage level of 220kV and above, and more specifically relates to a double-break isolating switch with grounding linkage.

Background technique

Isolating switch (commonly known as "knife switch") generally refers to a high-voltage isolating switch, that is, an isolating switch with a rated voltage above 1kV, usually referred to as an isolating switch. The principle and structure are relatively simple, but due to the large amount of use and high reliability requirements, it has a greater impact on the design, establishment and safe operation of substations and power plants. The main feature of the isolating switch is that it has no arc extinguishing ability, and can only open and close the circuit under the condition of no load current. The isolating switch is used at all levels of voltage to change the circuit connection or to isolate the line or equipment from the power supply. It has no current interruption capability and can only be operated after disconnecting the line with other equipment. Generally, there is an interlock device to prevent misoperation of the switch under load, and sometimes a pin is required to prevent the switch from being disconnected under the magnetic force of a large fault.

At present, the design concept of GIS equipment isolation switch in the power industry has gone through two stages of development:

The first stage: The traditional GIS switch design generally regards the isolation switch and the grounding switch as two independent functional units. At present, many mainstream manufacturers still adopt this design. Mis-closing the grounding knife switch when the gate is live and avoiding closing the isolation knife switch when the grounding knife is closed and grounded can only be controlled by electrical interlocking. If the electrical interlocking circuit fails or is unlocked by mistake, it may cause the grid line to trip. ACCIDENT.

The second stage: design of three-station isolation knife switch. This design integrates the characteristics and functions of the isolation knife switch and the grounding knife switch, and has three working positions: 1. The closing position where the main fracture of the isolation knife switch is connected; 2. The isolation position where the main fracture of the isolation knife switch is separated; 3. Grounding Grounding position for knife close. The three-station isolation knife switch is based on the traditional GIS knife switch electric chain control, and introduces the mechanical chain control function to form a double chain control, which is equivalent to double insurance, which greatly reduces the occurrence of switching due to electrical or mechanical chain failure. Power grid accident probability due to misoperation. The way to realize the three-position isolation knife switch is: the knife switch has only one moving contact, and the two ends of the moving contact are the isolation fracture end and the grounding end, so the working position of the moving contact at any time is unique. Either close the switch with the isolation fracture end, or close the switch with the ground terminal for grounding, or neither pass through nor ground, basically eliminating the possibility of misoperation in terms of the mechanical state of the knife switch contact.

Contents of the invention

The first object of the present invention is to provide a four-station isolating knife switch, which has two isolating fractures.

The second purpose of the present invention is that the grounding operation can be performed through the grounding knife switch in the middle of the isolation fracture, and the grounding knife switch and the isolation knife switch have linkage locking to prevent misoperation.

The present invention is achieved through the following technical solutions:

A double-break isolating switch with grounding linkage, comprising a housing, a double-break switch device, a drive device for an isolating switch, a grounding switch device, a drive device for a grounding switch, a transmission mechanism for a grounding switch, and a linkage device; the installation of the double-break switch device Inside the shell, it realizes the synchronous closing or opening of the breaks on both sides through the isolating switch drive device; the grounding switch device is installed on the shell to control the grounding opening and closing of the double-break switch device, which is passed The grounding switch driving device and the grounding switch transmission mechanism realize closing or opening; the linkage device is respectively connected with the isolating switch driving device and the grounding switch driving device, so that the grounding switch device can be operated only when the double-break switch device is in the opening state. closing; or when the grounding switch device is in the open state, the double-break switch device can be closed; the housing is provided with a plurality of sequentially connected airtight cavities, and each of the cavities is correspondingly provided with a Set of double-break switchgear and grounding switchgear.

As an improvement of the above solution, the isolating switch driving device includes a disconnecting switch motor connected in sequence, an isolating switch output shaft, and a disconnecting switch control circuit for controlling the isolating switch motor; the grounding switch driving device includes a grounding switch connected in sequence Switching motor, grounding switch output shaft, grounding switch control loop for controlling the grounding switch motor; the linkage device includes a first microswitch and a second microswitch; one end of the first microswitch is connected to an isolating switch The other end of the output shaft is connected to the grounding switch control circuit; one end of the second microswitch is connected to the grounding switch output shaft and the other end is connected to the isolating switch control circuit; the first microswitch is controlled by detecting the positional relationship of the isolating switch output shaft. The grounding switch controls the connection or cut-off of the circuit; the second microswitch controls the connection or cut-off of the isolation switch control circuit by detecting the positional relationship of the output shaft of the grounding switch.

As an improvement of the above solution, the first micro switch and the second micro switch are of the lever roller type, and the output shaft of the isolating switch is provided with a first touch groove that cooperates with the roller of the first micro switch The first micro switch is installed on the outer side of the output shaft of the isolating switch and its roller is corresponding to the positional relationship of the first touch groove; the output shaft of the grounding switch is provided with a second wheel that cooperates with the second micro switch. Two touch grooves; the second micro switch is installed on the outside of the grounding switch output shaft and its rollers correspond to the positional relationship of the second touch groove; the rollers of the first micro switch and the first touch When the groove fit is in the initial position, the double-break switch device is in the opening state, the control circuit of the grounding switch is connected, the output shaft of the isolating switch rotates one circle, the double-break switch device is in the closing state, the control circuit of the grounding switch is cut off, and the output shaft of the isolating switch Reversing one cycle, the double-break switch device returns to the opening state; when the roller of the second micro switch cooperates with the second touch groove to be in the initial position, the grounding switch device is in the opening state, and the isolation switch control circuit is connected. , the output shaft of the grounding switch rotates forward for one cycle, the grounding switch device is in the closed state, the control circuit of the isolation switch is cut off, the output shaft of the grounding switch reverses for one cycle, and the grounding switch device returns to the open state.

As an improvement of the above solution, it also includes a drive box, the drive box is arranged outside the casing, and the isolating switch drive device, the grounding switch drive device, and the linkage device are all arranged in the drive box.

As an improvement of the above solution, the grounding switch transmission mechanism includes a first rocker arm, a first connecting rod, a second rocking arm, and a second connecting rod; one end of the first rocking arm is connected to the output of the grounding switch drive device end connection, the second rocker arm is set on the grounding switchgear to operate the closing or opening of the grounding switchgear, and the swing end of the first rocker arm and the second rocker arm is connected through the first connecting rod ; The swing ends of the second rocker arms of the plurality of grounding switch devices are connected through a second connecting rod.

As an improvement to the above solution, the double-break switch device includes a moving contact seat, a pair of moving contacts and a pair of static contacts; the moving contact seat is arranged in the middle of the cavity; the A pair of static contacts are respectively arranged on the opposite sides of the moving contact seat; the pair of moving contacts are arranged inside the moving contact seat and can protrude from the opposite direction to the corresponding moving contact seat The static contacts are in contact with each other, and the pair of moving contacts are synchronously reciprocating and linearly moved by the driving mechanism, and are in contact with or separated from the static contacts at the same time; the pair of moving contacts are connected to each other.

In the current conversion process of the double-break isolating switch, the existing product isolating switch has only one break, the arcing time is long, which is not conducive to arc extinguishing, the ablation of the moving contact is serious, and the product metal powder is not conducive to product insulation. Performance, because the double-fracture isolating switch has two fractures for voltage division and arc extinguishing, arcing contacts can be installed on both sides, which greatly reduces the arcing time, reduces the burning loss of copper and tungsten contacts, and improves the service life of the product and performance.

As an improvement to the above solution, an axially arranged rack that cooperates with the drive mechanism is provided at the end of the movable contact away from the fixed contact.

As an improvement of the above solution, the drive mechanism includes an insulating transmission rod, a transmission gear, a transmission shaft, and a transmission insert; the transmission shaft is a spline shaft, which is connected to the disconnector drive device; the transmission insert The axis position of the shaft center is provided with a spline blind hole matched with the outer circumference of the spline shaft; the shaft center position of the transmission gear is provided with a spline through hole matched with the outer circumference of the spline shaft, and the outer circumference of the transmission gear is matched The external gear part fitted with the rack; the two ends of the insulating transmission rod are coaxially fixed with a transmission insert, and the spline blind hole of the transmission insert faces outward; the transmission gear is located at the The inside of the moving contact seat and the external gear part are matched with the racks of a pair of moving contacts; the transmission shaft passes through the spline hole of the transmission gear, and one end of the transmission shaft is connected to the insulating transmission rod The transmission insert at one end is connected, and the other end is connected with the transmission insert at one end of the insulating transmission rod of another group of drive mechanisms.

The present invention has the following beneficial effects:

1. The double-break isolation switch module adopts a three-phase linkage mechanical transmission structure, and the transmission is stable and reliable.

2. The built-in transmission structure design without exposed connecting rods is adopted to enhance the weather resistance of the key components of the product, reduce the transmission links, and improve the transmission efficiency of the isolation knife switch's opening and closing operation.

3. The grounding switch can be closed only when the isolating switch is in the open state. Similarly, the isolating switch can be closed only when the grounding switch is in the open state, avoiding manual misoperation and improving equipment safety.

Description of drawings

Fig. 1 is a three-dimensional structural schematic diagram of a double-break isolating switch with grounding linkage according to the present invention.

Fig. 2 is a schematic diagram of a vertical section structure of a double-break isolating switch with grounding linkage according to the present invention.

FIG. 3 is an enlarged schematic diagram of area A in FIG. 2 .

Fig. 4 is a cross-sectional schematic diagram of a double-break isolating switch with grounding linkage according to the present invention.

Fig. 5 is a schematic diagram of the internal structure of the drive box of the present invention.

Fig. 6 is a schematic diagram of cooperation between the first micro switch and the output shaft of the isolating switch according to the present invention.

Fig. 7 is a schematic diagram of cooperation between the second micro switch and the output shaft of the grounding switch according to the present invention.

Fig. 8 is a structural principle diagram of the linkage device of the present invention.

Explanation of reference numerals: housing 1, double-break switch device 2, isolating switch drive device 3, ground switch device 4, ground switch drive device 5, ground switch drive mechanism 6, linkage device 7, drive box 8, cavity 9, Isolating switch motor 10, isolating switch output shaft 11, switch control circuit 12 grounding switch motor 13, grounding switch output shaft 14, grounding switch control circuit 15, first micro switch 16, second micro switch 17, first touch recess Groove 18, second touch groove 19, first rocker arm 20, first connecting rod 21, second rocker arm 22, second connecting rod 23, moving contact seat 24, moving contact 25, static contact 26, Drive mechanism 27 , rack 28 , insulating transmission rod 29 , transmission gear 30 , transmission shaft 31 , and transmission insert 32 .

Detailed ways

As shown in Figures 1 to 5, a double-break isolating switch with grounding linkage includes a housing 1, a double-break switch device 2, an isolating switch drive device 3, a grounding switch device 4, a grounding switch drive device 5, a grounding switch The transmission mechanism 6, the linkage device 7, and the drive box 8, the drive box 8 is arranged on the outside of the housing 1, and the isolating switch drive device 3, the grounding switch drive device 5, and the linkage device 7 are all arranged on the drive box 8 Inside; the double-break switch device 2 is installed inside the housing 1, and it realizes the synchronous closing or opening of the fractures on both sides through the isolating switch drive device 3; the grounding switch device 4 is installed on the housing 1 for The double-break switch device 2 performs grounding switch control, which realizes closing or opening through the grounding switch drive device 5 and the grounding switch transmission mechanism 6; The driving device 5 is connected, so that when the double-break switch device 2 is in the opening state, the grounding switch device 4 can be closed; or when the grounding switch device 4 is in the open state, the double-break switch device 2 can be closed; The casing 1 is provided with three closed cavities 9 connected in sequence, and each of the cavities 9 is correspondingly provided with a group of double-break switch devices 2 and ground switch devices 4 .

As shown in Figure 8, the isolating switch driving device 3 includes a disconnecting switch motor 10, an isolating switch output shaft 11, an isolating switch control circuit 12 for controlling the isolating switch motor 10 connected in sequence; the grounding switch driving device 5 includes a grounding switch motor 13 connected in sequence, a grounding switch output shaft 14, and a grounding switch control circuit 15 for controlling the grounding switch motor 13; the linkage device 7 includes a first microswitch 16 and a second microswitch 17 One end of the first micro switch 16 is connected to the isolation switch output shaft 11 and the other end is connected to the grounding switch control circuit 15; one end of the second micro switch 17 is connected to the grounding switch output shaft 14 and the other end is connected to the isolation switch control circuit 12 The first microswitch 16 controls the connection or cut-off of the grounding switch control circuit 15 by detecting the positional relationship of the isolating switch output shaft 11; the second microswitch 17 detects the position of the grounding switch output shaft 14 Relationship control isolating switch control loop 12 on or off.

As shown in Figures 5 to 7, the first micro switch 16 and the second micro switch 17 are of the lever roller type, and the output shaft 11 of the isolating switch is provided with a roller with the first micro switch 16. Matching first touch groove 18; the first micro switch 16 is installed on the outside of the isolation switch output shaft 11 and its roller is corresponding to the first touch groove 18 positional relationship; the grounding switch output shaft 14 is provided with There is a second touch groove 19 that cooperates with the roller of the second microswitch 17; the second microswitch 17 is installed on the outside of the grounding switch output shaft 14 and its roller is corresponding to the positional relationship of the second touch groove 19; When the roller of the first micro switch 16 cooperates with the first touch groove 18 to be in the initial position, the double-break switch device 2 is in the opening state, the grounding switch control circuit 15 is connected, and the output shaft 11 of the isolating switch is After one turn, the double-break switch device 2 is in the closing state, the grounding switch control circuit 15 is cut off, the output shaft 11 of the isolating switch is reversed for one turn, and the double-break switch device 2 resumes the opening state; the roller of the second microswitch 17 and the When the second touch groove 19 is matched in the initial position, the grounding switch device 4 is in the opening state, the isolating switch control circuit 12 is connected, the grounding switch output shaft 14 rotates forward, and the grounding switch device 4 is in the closing state, isolating The switch control circuit 12 is cut off, the grounding switch output shaft 14 is reversed for one revolution, and the grounding switch device 4 returns to the opening state.

As shown in Figure 1, the grounding switch transmission mechanism 6 includes a first rocker arm 20, a first connecting rod 21, a second rocker arm 22, and a second connecting rod 23; one end of the first rocker arm 20 is connected to The output end of the grounding switch driving device 5 is connected, and the second rocker arm 22 is arranged on the grounding switch device 4 for operating the closing or opening of the grounding switch device 4. The first rocking arm 20 is connected to the second The swing ends of the rocker arms 22 are connected through the first connecting rod 21 ; the swing ends of the second rocker arms 22 of the plurality of grounding switch devices 4 are connected through the second connecting rod 23 .

As shown in Figures 2 to 4, the double-break switch device 2 includes a moving contact seat 24, a pair of moving contacts 25 and a pair of static contacts 26; the moving contact 25 seat 24 is located on the The middle part of the cavity 9; the pair of static contacts 26 are respectively arranged on the opposite sides of the seat 24 of the movable contact 25; the pair of movable contacts 25 are arranged on the movable contact 25 inside the seat 24 and can extend the movable contact from the opposite direction. The seat 24 contacts and cooperates with the corresponding static contact 26. The pair of movable contacts 25 drive synchronous reciprocating linear motion through the driving mechanism 27, and the static contact The heads 26 are in contact or separated at the same time; the pair of moving contacts 25 are connected to each other. At the end of the movable contact 25 facing away from the fixed contact 26, there is an axially arranged rack 28 that cooperates with the driving mechanism 27. The drive mechanism 27 includes an insulating transmission rod 29, a transmission gear 30, a transmission shaft 31, and a transmission insert 32; the transmission shaft 31 is a spline shaft, which is connected with the disconnector drive device 3; the transmission insertion The axis position of part 32 is provided with the spline blind hole that cooperates with the periphery of the spline shaft of transmission shaft 31; The axis position of described transmission gear 30 is provided with the spline through hole that cooperates with the periphery of spline shaft, The outer circumference of the transmission gear 30 is an external gear part 33 that cooperates with the rack 28; both ends of the insulating transmission rod 29 are coaxially fixed with a transmission insert 32, and the splines of the transmission insert 32 The blind hole faces outward; the transmission gear 30 is arranged inside the seat 24 of the movable contact 25 and the external gear part 33 is matched with the rack 28 of the pair of movable contacts 25; the transmission shaft 31 Through the spline through hole of the transmission gear 30, one end of the transmission shaft 31 is connected to the transmission insert 32 at one end of the insulating transmission rod 29, and the other end is connected to the transmission insert at one end of the insulating transmission rod 29 of another group of drive mechanisms 27. 32 connections.

working principle:

1. The double-break switch device 2 is in the closing position, and the grounding switch device 4 is in the opening position; the double-break switch device 2 module in the operating mechanism performs the opening operation, and the grounding switch device 4 module remains in the closing state; After the opening of the break switch device 2 is in place, the control circuit of the double break switch is cut off, and at the same time the control circuit of the ground switch is connected, and the ground switch device 4 is closed; The device 2 is opened, and the grounding switch device 4 is closed;

2. The double-break switch device 2 is in the opening position, and the grounding switch device 4 is in the closing position; the grounding switch device 4 module in the operating mechanism performs the opening operation, and the double-break switch device 2 module remains in the closing state; when the grounding After the opening of the switch device 4 is in place, the control circuit of the grounding switch is cut off, and at the same time the control circuit of the double-break switch is connected, and the double-break switch device 2 performs closing operation; after the closing operation is in place, the control circuit of the double-break switch is cut off, thereby completing the grounding switch Device 4 opens, and double-break switch device 2 closes.

The above detailed description is a specific description of the feasible embodiment of the present invention. This embodiment is not used to limit the patent scope of the present invention. Any equivalent implementation or change that does not deviate from the present invention should be included in the patent scope of this case. middle.

Claims (7)

1. it is a kind of have ground connection linkage double-fracture disconnecting switch, which is characterized in that including shell, double-fracture switching device, every From driving mechanism for switch, Grunding switch gear device, earthing switch driving device, earthing switch transmission mechanism, linkage；

The double-fracture switching device installation inside housings, the same of both sides fracture is realized by disconnecting switch driving device Step is closed a floodgate or separating brake；

The Grunding switch gear device is mounted on shell and carries out ground connection folding control to the double-fracture switching device, leads to It crosses earthing switch driving device and realizes combined floodgate or separating brake with earthing switch transmission mechanism；

The linkage is connect with disconnecting switch driving device, earthing switch driving device respectively, makes double-fracture switch dress When setting in gate-dividing state, Grunding switch gear device could close a floodgate；Or when Grunding switch gear device being made to be in gate-dividing state, double break Mouth switching device could close a floodgate；

It is equipped with multiple closed cavitys being sequentially communicated in the shell, one group of double break is correspondingly provided in each cavity Mouth switching device, Grunding switch gear device；

The disconnecting switch driving device includes sequentially connected disconnecting switch motor, disconnecting switch output shaft, for controlling The disconnecting switch control loop of disconnecting switch motor；

The earthing switch driving device includes sequentially connected earthing switch motor, earthing switch output shaft, for controlling The earthing switch control loop of earthing switch motor；

The linkage includes the first microswitch, the second microswitch；Described first microswitch one end connection every It leaves and closes output shaft other end connection earthing switch control loop；Second microswitch one end connection earthing switch output The axis other end connects disconnecting switch control loop；

First microswitch controls earthing switch control loop by detecting the position relationship of disconnecting switch output shaft It connects or cuts off；

Second microswitch controls disconnecting switch control loop by detecting the position relationship of earthing switch output shaft It connects or cuts off.

2. a kind of double-fracture disconnecting switch with ground connection linkage according to claim 1, which is characterized in that described the One microswitch, the second microswitch are lever roller formula, and the disconnecting switch output shaft is equipped with and the first microswitch Idler wheel cooperation first touch groove；First microswitch be mounted on the outside of disconnecting switch output shaft and its idler wheel with First, which touches groove location relationship, corresponds to；

The earthing switch output shaft is equipped with second coordinated with the idler wheel of the second microswitch and touches groove；

Second microswitch is mounted on the outside of earthing switch output shaft and its idler wheel and second touches groove location relationship It is corresponding；

When the idler wheel of first microswitch touches groove cooperation in initial bit with described first, double-fracture switch dress It sets and is in gate-dividing state, the connection of earthing switch control loop, along circling, double-fracture switching device is in disconnecting switch output shaft "on" position, the excision of earthing switch control loop, disconnecting switch output shaft is inverse to circle, and double-fracture switching device restores separating brake shape State；

When the idler wheel of second microswitch touches groove cooperation in initial bit with described second, Grunding switch gear device In gate-dividing state, the connection of disconnecting switch control loop, along circling, Grunding switch gear device is in close a floodgate earthing switch output shaft State, the excision of disconnecting switch control loop, earthing switch output shaft is inverse to circle, and Grunding switch gear device restores gate-dividing state.

3. a kind of double-fracture disconnecting switch with ground connection linkage according to claim 1, which is characterized in that further include driving Dynamic case, the driving box are arranged in the outside of shell, the disconnecting switch driving device, earthing switch driving device, connection Dynamic device is arranged in driving box.

4. a kind of double-fracture disconnecting switch with ground connection linkage according to claim 1, which is characterized in that described connects Ground switch drive includes the first rocking arm, first connecting rod, the second rocking arm, second connecting rod；

One end of first rocking arm is connect with the output end of earthing switch driving device, and second rocking arm setting is connecing The combined floodgate or separating brake of operational grounding switching device, the swinging end of first rocking arm and the second rocking arm are used on ground switching device It is connected by first connecting rod；The swinging end of second rocking arm of multiple Grunding switch gear devices is connected by second connecting rod.

5. a kind of double-fracture disconnecting switch with ground connection linkage according to any one of claims 1 to 4, feature exist In the double-fracture switching device includes movable contact block, a pair of of moving contact and a pair of of static contact；

The movable contact block is located at the middle part of the cavity；A pair of of static contact is respectively provided at the movable contact block Opposite both sides；A pair of of moving contact be located inside the movable contact block and can be stretched out from relative direction movable contact block with Corresponding static contact is engaged, and a pair of of moving contact acts synchronous linear reciprocating motion by driving mechanism band, with Static contact is contacted or is detached simultaneously simultaneously；A pair of of moving contact mutual conduction.

6. a kind of double-fracture disconnecting switch with ground connection linkage according to claim 5, which is characterized in that described Moving contact is equipped with the axial arranged rack coordinated with the driving mechanism away from one end of static contact.

7. a kind of double-fracture disconnecting switch with ground connection linkage according to claim 6, which is characterized in that the drive Motivation structure includes insulating driving rod, transmission gear, transmission shaft, transmission insert；The transmission shaft is splined shaft, and is isolated Driving mechanism for switch connects；The shaft core position of the transmission insert is equipped with the spline blind hole coordinated with the periphery of splined shaft； The shaft core position of the transmission gear is equipped with the spline through-hole coordinated with the periphery of splined shaft, the periphery of transmission gear for institute The outer gear portion for the rack cooperation stated；A transmission insert is coaxially fixed at the both ends of the insulating driving rod, described It is driven the spline blind hole of insert outwardly；The transmission gear is located inside the movable contact block and the outer gear portion Coordinate with the rack of a pair of of moving contact；The transmission shaft pass through transmission gear spline through-hole, described transmission shaft one end with The transmission insert of insulating driving rod one end connects, and the other end and the transmission of insulating driving rod one end of another group of driving mechanism are embedding Enter part connection.