An air-type bypass switching device for power reactive power compensation system

Abstract

The utility model is an air-type bypass switching device for a reactive power compensation system. When a power electronic device fails, the device issues a bypass switching command, the electromagnet of the bypass switching device is energized, and under the influence of the magnetic force of the electromagnet, the armature moves toward the electromagnet, thereby causing the holding mechanism to trip, and the conductive column of the device is connected to the static busbar under the action of the main spring, thereby isolating the faulty power electronic device in the system and ensuring the normal operation of the reactive power compensation device. The utility model eliminates the vacuum switch tube and adopts an "air-type" contact structure, which can effectively reduce costs; increases the opening distance of the dynamic and static contacts, and can be adjusted during assembly to ensure sufficient electrical clearance and improve the safety of system operation; the device adopts the operating principle of automatic closing and manual opening. When the circuit breaker needs to be opened, the manual opening lever is operated by a special opening wrench to achieve the opening of the device. The utility model is safe and reliable and easy to maintain.

Description

Technical Field

[0001] The utility model relates to a bypass switching device, in particular to an air type bypass switching device for an electric reactive power compensation system. Background Art

[0002] At present, vacuum bypass switches are mainly used for bypass protection of power electronic semiconductor devices. The main contacts of the bypass switch are connected in parallel with the power electronic semiconductor devices. The main contact scheme of the bypass switching device on the market is a vacuum switch tube scheme, which realizes the switching of the bypass switching device in the system by controlling the closing and opening of the vacuum switch tube.

[0003] The main shortcomings of this solution are as follows:

[0004] 1. The cost of vacuum switch tube is high;

[0005] 2. The product operation stroke depends on the opening and closing stroke of the vacuum switch tube, which has high requirements for production and operation. Improper operation can easily damage the vacuum switch tube;

[0006] 3. The sealed structure of the vacuum switch tube is not convenient for contact maintenance. Utility Model Content

[0007] In order to solve the above technical problems, the utility model is an air-type bypass switching device for a power reactive power compensation system, and its technical solution is as follows:

[0008] It comprises a housing, a manual tripping lever is arranged on the top of the housing, and a static busbar, a conductive column, a moving busbar, an insulator, a main spring, a locking piece, an electromagnet and an armature are arranged inside the housing;

[0009] One end of the moving busbar and the static busbar extend out of the shell respectively; the lower part of the static busbar is installed at the bottom of the shell, and a conductive column, an insulator, a main spring and a locking piece are arranged on the static busbar in sequence; the conductive column is installed on the shell through a limit bracket, the moving end of the conductive column fits with the lower end of the moving busbar, and is connected to the conductive column by a second connecting piece, and the second connecting piece locks the end face of the moving end of the conductive column and the fitting surface of the moving busbar tightly; the other end of the second connecting piece is fixed together with one end of the insulator, and the other end of the insulator is fixedly connected to one end of the first connecting piece, and the main spring is mounted on the first connecting piece, and the main spring is connected to the insulator. The main spring is installed between the fixed position of the shell and the insulator and is in a compressed state; the other end of the first connecting piece is fixed to the locking piece, and the other end of the locking piece is fixed to the manual opening lever, a limiting notch is provided on one side of the locking piece, and a space area for the locking piece to move longitudinally is provided on the locking piece;

[0010] The electromagnet is installed on the housing, and the electromagnet is arranged on the same side of the extended ends of the moving busbar and the static busbar;

[0011] The armature passes through the locking piece horizontally, the middle of the armature is the main shaft, the front end of the main shaft is the moving iron core, and the moving iron core is close to the electromagnet; the middle of the main shaft is a disc, and the outer edge of the disc is clamped in the notch of the locking piece; a small spring is installed at the tail of the main shaft to provide lateral pulling force for the armature.

[0012] Furthermore, a micro switch is provided on the shell, which is fixed to the shell by screws and has a toggle handle. A threaded hole is provided on the locking piece for fixing a set screw, which protrudes from the mounting surface by more than 8 mm after installation. The set screw is synchronized with the opening and closing movement of the device, thereby driving the movement of the micro switch to realize feedback on the opening and closing status of the device.

[0013] Furthermore, a limiting bracket is installed on the shell, and a circular ring structure is formed in the middle thereof for the conductive column to pass through, and the limiting bracket plays a role in limiting the conductive column and correcting the coaxiality of movement.

[0014] Furthermore, the moving busbar is a soft copper strip, which can be deformed and stretched in the middle.

[0015] The beneficial effects of the utility model are as follows: the utility model is an air-type bypass switching device for a reactive power compensation system. The bypass switching device, as a component of the reactive power compensation device, is connected in parallel with the protected power electronic device and is mainly used for bypass protection of power electronic semiconductor devices. When the power electronic device is in a normal state, the main contact of the bypass switching device is in an open circuit state; when a fault occurs in the power electronic device, the device issues a bypass switching command, the electromagnet of the bypass switching device is energized, and under the influence of the magnetic force of the electromagnet, the armature moves toward the electromagnet, thereby causing the holding mechanism to trip, and the conductive column of the device is connected to the static busbar under the action of the main spring, thereby isolating the faulty power electronic device in the system and ensuring the normal operation of the reactive power compensation device. The utility model eliminates the vacuum switch tube and adopts an "air type" contact structure, which can effectively reduce costs; the opening distance of the moving and static contacts is increased, and can be adjusted during assembly to ensure sufficient electrical clearance and improve the safety of system operation; the device adopts the operating principle of automatic closing and manual opening. When the circuit breaker needs to be opened, the manual opening rod is operated by a special opening wrench to achieve the opening of the device. The utility model is safe, reliable and easy to maintain. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the utility model's split gate structure;

[0017] Figure 2 for Figure 1 Schematic diagram of closing structure;

[0018] Figure 3 for Figure 1 Schematic diagram of the cross-section structure;

[0019] As shown in the figure, 1 is the housing, 2 is the electromagnet, 3 is the armature, 4 is the first connecting piece, 5 is the main spring, 6 is the moving busbar, 7 is the insulator, 8 is the second connecting piece, 9 is the conductive column, 10 is the static busbar, 11 is the limit bracket, 12 is the sealing ring, 13 is the small spring, 14 is the manual opening lever, 15 is the locking piece, 16 is the disc, 17 is the set screw, 18 is the micro switch, 19 is the first cavity, 20 is the second cavity, 21 is the third cavity, and 22 is the fourth cavity. DETAILED DESCRIPTION

[0020] As shown in the figure, the utility model is an air-type bypass switching device for an electric reactive power compensation system, comprising a shell 1, which is divided into four cavities, a first cavity 19 and a third cavity 21 are longitudinally arranged; a second cavity 20 and a fourth cavity 22 are transversely arranged, respectively arranged on both sides of the third cavity; and the first cavity is connected to the third cavity, and the second cavity, the third cavity and the fourth cavity are connected.

[0021] A manual tripping lever is provided on the top of the housing 1, and a static busbar, a conductive column, a dynamic busbar, a first connecting piece, a second connecting piece, an insulator, a main spring, a locking piece, an electromagnet and an armature are provided in the housing; wherein the manual tripping lever, the locking piece, the first connecting piece, the insulator, the second connecting piece, the dynamic busbar and the conductive column are connected as a whole, and can move synchronously along the axial direction; the manual tripping lever is used as a device tripping lever and is operated by a special wrench; the locking piece is provided with a snap-on structure, which cooperates with the armature structure to realize the locking and release of the structure. The dynamic busbar is a copper strip soft connection structure, which is welded at both ends and tinned, and the middle part can be deformed and stretched. The dynamic busbar is connected to the conductive column, and the conductive column moves axially to achieve a reliable connection with the static busbar.

[0022] The first cavity is provided with a static busbar 10, a conductive column 9, a dynamic busbar 6, an insulator 7, and a main spring 5. One end of the dynamic busbar and the static busbar extend out of the housing respectively, and are sealed with the housing by a sealing ring 12. The lower part of the static busbar is installed at the bottom of the housing, and the conductive column, the insulator and the main spring are arranged on the static busbar in sequence; the conductive column is installed on the housing through a limit bracket 11, and the limit bracket is provided with fixing screws at both ends to be installed on the housing, and the middle is a circular ring structure for the conductive column to pass through, and it plays the role of limiting the conductive column and correcting the coaxiality of movement. The moving end of the conductive column fits with the lower end of the moving busbar, and is connected to the conductive column 9 by a second connector 8 (which can be threaded and fixed, and one end of the long thread of the second connector is screwed into the conductive column). The second connector locks the moving end face of the conductive column and the fitting surface of the moving busbar tightly; the other end of the second connector is fixed to one end of the insulator (the second connector and the insulator can be threaded and fixed), and the other end of the insulator is fixedly connected to one end of the first connector (the insulator and the first connector can be threaded and fixed), and a main spring 5 is mounted on the first connector, and the insulator is connected to the main spring. The main spring is installed between the fixed position of the shell (restricted by the first cavity 19) and the insulator. In normal state (no power is supplied), the main spring is in a compressed state; the top of the first connector extends out of the first cavity to the third cavity.

[0023] A locking piece 15 is provided in the third cavity, and the other end of the first connecting piece 4 is fixed with the locking piece (the first connecting piece and the locking piece can be threadedly connected and fixed), and the other end of the locking piece is fixed with the manual opening rod 14 (the lower part of the manual opening rod extends into the third cavity, and the locking piece and the manual opening rod can be threadedly connected and fixed), and a limiting notch (the shape of the notch is the same as the shape of the disk) is provided on the left side of the locking piece (close to the electromagnet), and a space area for the locking piece to move longitudinally is provided on the locking piece. When the locking piece is disengaged from the disk or the manual opening rod is pulled, the locking piece moves longitudinally, and its spatial stroke is equal to or greater than the contact stroke between the bottom of the conductive column and the static busbar.

[0024] An electromagnet 2 is provided in the second cavity and is mounted on the housing by screws. The electromagnet is arranged on the same side of the extended ends of the moving busbar and the static busbar.

[0025] The shape of the electromagnet is the same as the shape and size of the front end of the armature 3 (i.e., the moving iron core), which is convenient for attraction. The armature 3 passes through the second cavity 20, the third cavity 21, and the fourth cavity 22 horizontally, and passes through the locking piece 15. The middle of the armature is the main shaft, and the front end of the main shaft is the moving iron core (shaped as a cylinder or a square, and the cross-sectional width of the moving iron core is greater than the cross-sectional width of the main shaft.), The moving iron core is close to the electromagnet and is arranged in the second cavity, and the magnetic force is generated by energizing the electromagnet. The middle part of the main shaft is a disc 16 (or an oblate cylinder, whose cross-sectional diameter is greater than the cross-sectional width of the main shaft.), which is arranged in the third cavity, and the outer edge of the middle disc is snapped ( / buckled) in the notch of the locking piece. A small spring 13 is set at the tail of the main shaft, and the small spring is arranged in the fourth cavity. There are limit baffles (fixed on the main shaft) in front and behind the small spring, and the front limit baffle is limited by the fixed position of the shell (limited by the fourth cavity). The armature can move axially under the action of magnetic force, and the small spring at the end of the armature provides lateral pulling force for the armature, so that the armature remains locked with the locking member when not affected by the magnetic force of the electromagnet. The main shaft, the moving iron core and the disc can be integrally formed.

[0026] A micro switch 18 is also provided on the shell, and the micro switch is fixed to the shell with screws. The micro switch is provided with a toggle handle. When the toggle handle moves to the set position, it can trigger the closing and disconnection of the internal circuit of the micro switch, thereby realizing the switching of the external state output signal; a threaded hole is provided on the locking member for fixing a set screw 17. After installation, the set screw protrudes more than 8mm from the mounting surface. When the device is in the open state, the set screw contacts the toggle handle of the micro switch, triggering the micro switch. At this time, the micro switch outputs a disconnection signal to the outside. When the device is in the closed state, the set screw separates from the toggle handle of the micro switch, and the micro switch is reset. At this time, the micro switch outputs a conduction signal to the outside. The set screw is synchronized with the opening and closing movement of the device, thereby promoting the movement of the micro switch, thereby realizing feedback on the opening and closing state of the device.

[0027] Working process:

[0028] ① When a power electronic device fails, the main contact of the bypass switching device closes quickly, the electromagnet is energized, and the armature can move axially under the action of the magnetic force of the electromagnet. The electromagnet attracts the armature, the small spring is compressed, the disc is disengaged from the locking piece, and fits with the side of the locking piece. At this time, the main spring is reset, so that the manual trip rod, the first connecting piece, the insulator, the second connecting piece, and the conductive column are all downward, and the static end of the conductive column is connected to the static busbar to realize the closing operation, so that the system can still operate normally.

[0029] ② When opening the circuit breaker, the manual opening rod is operated by a special opening wrench to drive the locking piece, the first connecting piece, the insulator, the second connecting piece and the conductive column upward together, the main spring is compressed, the outer edge of the disc is stuck in the notch, the small spring is reset, and the armature is pulled back laterally and disengaged from the electromagnet, and the armature is kept in a locked state with the locking piece when it is not affected by the magnetic force of the electromagnet; the conductive column is separated from the static busbar to realize the opening operation.

[0030] The utility model is an air-type bypass switching device for a reactive power compensation system. As a component of the reactive power compensation device, the bypass switching device is connected in parallel with the protected power electronic device and is mainly used for bypass protection of the power electronic semiconductor device. When the power electronic device is in a normal state, the main contact of the bypass switching device is in an open circuit state; when the power electronic device fails, the control board of the device issues a bypass switching command, the electromagnet of the bypass switching device is energized, and under the influence of the magnetic force of the electromagnet, the armature moves toward the electromagnet, thereby causing the holding mechanism to trip, and the conductive column of the device is connected to the static busbar under the action of the main spring, thereby isolating the faulty power electronic device in the system, and ensuring the normal operation of the reactive power compensation device. The utility model eliminates the vacuum switch tube and adopts an "air-type" contact structure, which can effectively reduce costs; increases the opening distance of the moving and static contacts, and can be adjusted during product assembly to ensure sufficient electrical clearance and improve system operation safety; increases the cross-sectional area of ​​the conductive system to meet the current carrying capacity requirements of different current levels within 800A, effectively reducing product temperature rise; and adopts a high-performance spring, so that the closing time can be controlled within 15ms.

[0031] As a key component in a flexible power transmission system, the bypass switching device of the utility model adopts the operating principle of automatic closing and manual opening. When the circuit breaker needs to be opened, the manual opening lever is operated by a special opening wrench to open the device, which is safe, reliable and easy to maintain.

[0032] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the utility model and are not used to limit the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection of the utility model is defined by the attached claims and their equivalents.

Claims

1. An air-type bypass switching device for a power reactive power compensation system, comprising a housing, characterized in that: A manual tripping lever is provided on the top of the housing, and a static busbar, a conductive column, a moving busbar, an insulator, a main spring, a locking piece, an electromagnet and an armature are provided inside the housing; One end of the moving busbar and the static busbar extend out of the shell respectively; the lower part of the static busbar is installed at the bottom of the shell, and a conductive column, an insulator, a main spring and a locking piece are arranged on the static busbar in sequence; the conductive column is installed on the shell through a limit bracket, the moving end of the conductive column fits with the lower end of the moving busbar, and is connected to the conductive column by a second connecting piece, and the second connecting piece locks the end face of the moving end of the conductive column and the fitting surface of the moving busbar tightly; the other end of the second connecting piece is fixed together with one end of the insulator, and the other end of the insulator is fixedly connected to one end of the first connecting piece, and the main spring is mounted on the first connecting piece, and the main spring is connected to the insulator. The main spring is installed between the fixed position of the shell and the insulator and is in a compressed state; the other end of the first connecting piece is fixed to the locking piece, and the other end of the locking piece is fixed to the manual opening lever, a limiting notch is provided on one side of the locking piece, and a space area for the locking piece to move longitudinally is provided on the locking piece; The electromagnet is installed on the housing, and the electromagnet is arranged on the same side of the extended ends of the moving busbar and the static busbar; The armature passes through the locking piece horizontally, the middle of the armature is the main shaft, the front end of the main shaft is the moving iron core, and the moving iron core is close to the electromagnet; the middle of the main shaft is a disc, and the outer edge of the disc is clamped in the notch of the locking piece; a small spring is installed at the tail of the main shaft to provide lateral pulling force for the armature.

2. The air bypass switching device for a power reactive power compensation system according to claim 1, characterized in that: A micro switch is also provided on the housing, which is fixed to the housing with screws and has a toggle handle. A threaded hole is provided on the locking piece for fixing a set screw, which protrudes from the mounting surface by more than 8 mm after installation. The set screw is synchronized with the opening and closing movement of the device, thereby driving the movement of the micro switch to realize feedback on the opening and closing status of the device.

3. The air bypass switching device for a power reactive power compensation system according to claim 1, characterized in that: The limiting bracket is installed on the shell, and the middle part of the bracket is a circular ring structure for the conductive column to pass through, and the limiting bracket plays the role of limiting the conductive column and correcting the coaxiality of movement.

4. The air bypass switching device for a power reactive power compensation system according to claim 1, characterized in that: The moving busbar is a soft copper strip that can deform and expand in the middle.

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