Pole-mounted vacuum switch-drop-out fuse combination switch

Abstract

The invention discloses a pole-mounted vacuum switch-drop-out fuse combination switch, and each phase of the combination switch is formed by connecting a one-phase vacuum switch and a one-phase drop-out fuse in series, thereby forming a complete-phase combination switch. An insulating operating rod, a ground supporting insulating column, a vacuum arc-extinguishing chamber, a current sensor, a voltage sensor, a wire outlet terminal, a drop-out fuse tube, a drop-out fuse tube operating ring, an interlocking baffle plate shaft and an interlocking baffle plate are assembled or glued on the ground supporting insulating column to form a complete one-phase combined switch assembly. A box body is arranged above the ground supporting insulation columns, three phases of the ground supporting insulation columns are all installed on the box body, the operating mechanism is installed in the box body, three phases of the vacuum switch are driven by one operating mechanism to form three-phase linkage, and the drop-out fuse tube is in split-phase operation. The vacuum switch is used for switching on and off load current and switching off the load current to fault current; the drop-out fuse plays a role in switching on and switching off the overload current until the fault current.

Description

Technical Field

[0001] The invention relates to the field of electrical switches, in particular to a pole mounted vacuum switch-drop fuse combination switch. Background Art

[0002] Figure 1 It is a typical schematic diagram of an existing drop fuse, such as Figure 1 As shown, in the prior art, it consists of a supporting insulator 1, a lower outlet terminal 2, a lower conductive seat 3, a fuse tube 4, an upper conductive seat 5, and an upper outlet terminal 6.

[0003] All components are mounted on the supporting insulator 1 to form an integral body. The lower outlet terminal 2 and the upper outlet terminal 6 are the inlet and outlet terminals of the external circuit connected to the drop fuse. The fuse tube 4 is hung on the lower conductive seat 3, and the fuse tube 4 can rotate around the lower conductive seat 3, so that the other contact of the fuse tube 4 is connected to the upper conductive seat 5, so that the lower conductive seat 3 and the upper conductive seat 5 are connected through the fuse tube 4; when the overload current or fault current flows through the fuse tube 4, the fuse in the fuse tube 4 will melt and break the circuit, disconnecting the electrical connection between the lower conductive seat 3 and the upper conductive seat 5, and then the fuse tube 4 will detach from the upper conductive seat 5 and rotate around the lower conductive seat 3 and fall down, forming a complete disconnection between the lower conductive seat 3 and the upper conductive seat 5.

[0004] If power supply needs to be restored, it is necessary to manually use an insulating rod to remove the fuse tube 4 hung on the lower conductive seat 3, replace the fuse in the fuse tube 4, and then re-hang the fuse tube 4 on the lower conductive seat 3, and manually use an insulating rod to rotate the fuse tube 4 around the lower conductive seat 3 and connect it to the upper conductive seat 5, thereby restoring the electrical connection between the lower conductive seat 3 and the upper conductive seat 5 and making the circuit conductive.

[0005] This type of drop fuse can usually only interrupt overload currents up to fault currents, but cannot interrupt the rated current of normal circuits. Of course, there are also products that add arc extinguishing devices outside the fuse tube 4, which can only interrupt some small rated currents, which can only reach tens of amperes, and the number of interruptions is also very small, only dozens of times. On the other hand, existing drop fuses are all manually operated, and personnel must operate them with an insulating rod under the drop fuse. Once a fault current occurs during operation, it will endanger personal safety.

[0006] Figure 2a This is a typical schematic diagram of a column-mounted vacuum switch. Figure 2b for Figure 2a As shown in Figure 2, in the prior art, the pole-mounted vacuum switch includes an operating mechanism 01, an insulating operating rod 02, a supporting insulator 03, a conductive connection 04, a vacuum interrupter 05, a current transformer 06, a voltage sensor 07, an upper outlet terminal 08, and a lower outlet terminal 09.

[0007] The overall insulation to the ground is supported by the support insulator 03. When the operating mechanism 01 drives the insulating operating rod 02 to move up and down, the moving contact in the vacuum interrupter 05 is driven to move up and down, and the moving and static contacts are contacted or separated in the vacuum interrupter 05, thereby forming the conduction and disconnection of the circuit. The conductive connection 04 ensures the electrical connection between the moving end of the vacuum interrupter 05 and the lower outlet terminal 09, and the static end of the vacuum interrupter 05 is electrically connected to the upper outlet terminal 08. The current transformer 06 and the voltage sensor 07 are set for collecting circuit parameters.

[0008] The existing vacuum switch can detect the circuit running status by itself, and automatically or by command interrupt any current in the circuit from the rated current to the fault current. The disadvantage is that the interruption time for the fault current is long, which often leads to the expansion of accidents and increased losses. In addition, the cost is high, which is the root cause of the current manually operated drop fuse cannot be eliminated. Summary of the invention

[0009] The present invention provides a pole mounted vacuum switch-drop fuse combination switch to solve the problems existing in the above-mentioned prior art.

[0010] To achieve the above-mentioned purpose, the present invention discloses a pole-mounted vacuum switch-drop fuse combination switch, wherein each phase of the combination switch is composed of a phase vacuum switch and a phase drop fuse tube connected in series to form a complete one-phase combination switch; an insulating operating rod, a ground-supporting insulating column, a vacuum arc chamber conductive connection, a vacuum arc chamber, a current sensor, a voltage sensor, an outlet terminal, a ground-supporting insulating column reinforcement rib, a drop fuse tube hanging shaft, a drop fuse tube, a drop fuse tube operating ring, a chain baffle shaft, and a chain baffle are all assembled or glued on the ground-supporting insulating column to form a complete one-phase combination switch assembly; a box body is provided above the ground-supporting insulating column, three ground-supporting insulating columns are all installed on the box body, an operating mechanism is installed inside the box body, three phases of the vacuum switch are driven by an operating mechanism to form a three-phase linkage, and the drop fuse tube is operated in three-phase split phases. The vacuum switch breaks the load current and closes the load current up to the fault current; the drop-out fuse breaks the overload current up to the fault current; if the drop-out fuse is replaced with a drop-out isolating switch, the drop-out isolating switch can play an electrical isolation role, and the drop-out fuse or the drop-out isolating switch has a visible isolating fracture of the column-mounted combination switch. When the combination switch is closed, the drop-out fuse tube closes first, and then the vacuum switch fracture is closed; when the combination switch is opened, the normal rated current is broken by the vacuum switch fracture, and the drop-out fuse tube does not move; for abnormal overload current up to the fault current, the drop-out fuse automatically melts and breaks, and the drop-out fuse tube falls to form an isolating fracture, and then the vacuum switch fracture determines whether to open the gate according to the needs. There is an interlock between the vacuum switch and the drop-out fuse tube of the combination switch. The vacuum switch has a locking function for the drop-out fuse tube; when the vacuum switch is in the open position, the drop-out fuse tube is in an unlocked state and can be opened and closed; when the vacuum switch is in the closed position, the drop-out fuse tube is in a locked state and cannot be opened and closed.

[0011] In one embodiment of the present invention, the combination switch is a three-phase integrated structure.

[0012] In one embodiment of the present invention, an operating mechanism drives the insulating operating rod in the three-phase supporting insulating column to move up and down, thereby driving the conductive connection of the vacuum arc chamber and the horizontal left and right movement of the moving contact in the vacuum arc chamber to realize the opening and closing operations of the vacuum arc chamber. The accessory current sensor, voltage sensor, and output terminal together constitute a vacuum switch. In this way, an operating mechanism drives the three-phase vacuum arc chamber to perform opening and closing operations by operating the three-phase insulating operating rod, so this vacuum switch is three-phase linked.

[0013] In one embodiment of the present invention, the opening and closing operations of the drop-out fuse tube are performed by manually pushing and pulling the operating ring to perform phase-by-phase operations.

[0014] In one embodiment of the present invention, a vacuum switch is composed of an operating mechanism, an insulating operating rod, a vacuum arc chamber conductive connection, a vacuum arc chamber, a current sensor, a voltage sensor, and an output terminal. The vacuum switch is a vacuum circuit breaker or a vacuum load switch.

[0015] In one embodiment of the present invention, the drop fuse tube is a jet drop fuse tube, a current limiting fuse or a drop isolation switch.

[0016] In one embodiment of the present invention, if the current sensor and / or the voltage sensor detects that the three-phase current and / or the three-phase voltage are abnormal, the detection results of the current sensor and / or the voltage sensor are transmitted to the controller, so that the controller sends a signal to drive the vacuum switch to open, so as to avoid abnormal operation of the power grid. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 It is a schematic diagram of a typical existing pole-mounted drop fuse;

[0019] Figure 2a It is a schematic diagram of a typical existing column-mounted vacuum switch;

[0020] Figure 2b for Figure 2a Stereoscopic image of

[0021] Figure 3 The invention discloses a pole mounted vacuum switch-drop fuse combination switch according to an embodiment of the present invention. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] The present invention provides a pole-mounted vacuum switch-drop fuse combination switch, wherein each phase of the combination switch is formed by a phase vacuum switch and a phase drop fuse tube connected in series to form a complete one-phase combination switch; an insulating operating rod, a ground-supporting insulating column, a vacuum arc chamber conductive connection, a vacuum arc chamber, a current sensor, a voltage sensor, an outlet terminal, a ground-supporting insulating column reinforcement rib, a drop fuse tube hanging shaft, a drop fuse tube, a drop fuse tube operating ring, a locking baffle shaft, and a locking baffle are all assembled or glued on the ground-supporting insulating column to form a complete one-phase combination switch component; a box body is provided above the ground-supporting insulating column, three ground-supporting insulating columns are all installed on the box body, an operating mechanism is installed inside the box body, three phases of the vacuum switch are driven by an operating mechanism to form a three-phase linkage, the drop fuse tube is operated in three-phase split phases, and the drop fuse or the drop isolating switch can serve as a visible isolating fracture of the pole-mounted combination switch.

[0024] The vacuum switch interrupts the load current and closes the load current up to the fault current; the drop-out fuse interrupts the overload current up to the fault current; if the drop-out fuse is replaced with a drop-out isolating switch, the drop-out isolating switch can play the role of electrical isolation, and the drop-out fuse or the drop-out isolating switch has the visible isolating fracture of the pole-mounted combination switch.

[0025] When the combination switch is closed, the drop-out fuse tube is closed first, and then the vacuum switch break is closed;

[0026] When the combination switch is opened, the normal rated current is disconnected by the vacuum switch break, and the drop-out fuse tube does not move; for abnormal overload current or even fault current, the drop-out fuse automatically melts and disconnects, and the drop-out fuse tube drops to form an isolation break. After that, the vacuum switch break can decide whether to open the circuit breaker according to needs.

[0027] There is an interlock between the vacuum switch and the drop fuse tube of the combination switch. The vacuum switch has a locking function for the drop fuse tube; when the vacuum switch is in the open position, the drop fuse tube is in the unlocked state and can be opened and closed; when the vacuum switch is in the closed position, the drop fuse tube is in the locked state and cannot be opened and closed;

[0028] Figure 3 This is a schematic diagram of a pole mounted vacuum switch-drop fuse combination switch according to an embodiment of the present invention; the stereoscopic diagram of this case can be referred to Figure 2b As shown, the structures and implementation methods of the two are similar, and those skilled in the art can Figure 2bThe three-dimensional diagram of the present case can be known from the structural form, which will not be described here. The three phases of the vacuum switch are driven by an operating mechanism 001, and each phase of the combination switch includes an insulating operating rod 002, an insulating column supporting the ground 003, a conductive connection of the vacuum interrupter 004, a vacuum interrupter 005, a current sensor 006, a voltage sensor 007, an outlet terminal 008, a reinforcing rib of the insulating column supporting the ground 009, a drop fuse tube hanging shaft 010, a drop fuse tube 011, a drop fuse tube operating ring 012, a locking baffle shaft 013, and a locking baffle 014;

[0029] There is a box A above the ground-supporting insulating column 003, and three ground-supporting insulating columns 003 are all installed on the box A. The operating mechanism 001 is installed inside the box A. The insulating operating rod 002, the vacuum interrupter conductive connection 004, the vacuum interrupter 005, the current sensor 006, the voltage sensor 007, the outlet terminal 008, the ground-supporting insulating column reinforcing rib 009, the drop fuse tube hanging shaft 010, the drop fuse tube 011, the drop fuse tube operating ring 012, the interlocking baffle shaft 013, and the interlocking baffle 014 are all assembled or glued on the ground-supporting insulating column 003 to form a complete one-phase component;

[0030] The operating mechanism 001 is located in a box on which three-phase ground-supporting insulating columns 003 are installed together; the operating mechanism 001 drives the insulating operating rod 002 in the three-phase ground-supporting insulating columns 003 to move up and down, thereby driving the vacuum arc chamber conductive connection 004 and the moving contact in the vacuum arc chamber 005 to move horizontally left and right, realizing the opening and closing operation of the vacuum arc chamber 005, wherein the accessory current sensor 006, voltage sensor 007, and outlet terminal 008 together constitute a vacuum switch. Such an operating mechanism 001 drives the three-phase vacuum arc chamber 005 to open and close operations by operating the three-phase insulating operating rod 002, so this vacuum switch is three-phase linked;

[0031] The ground-supporting insulating column reinforcement 009, the drop fuse tube hanging shaft 010, the drop fuse tube 011, the drop fuse tube operating ring 012, the interlocking baffle shaft 013, and the interlocking baffle 014 are all assembled or glued on the ground-supporting insulating column 003 to form a complete one-phase assembly. The opening and closing operation of this drop fuse tube is performed by manually pushing and pulling the operating ring 012 for phase separation.

[0032] There is a linkage between the vacuum interrupter and the drop fuse tube, and the vacuum interrupter has a locking function for the drop fuse tube; when the vacuum interrupter 005 and the drop fuse tube 011 are in the closed position, the interlocking baffle shaft 013 rotates counterclockwise to drive the interlocking baffle 014 to block the drop fuse tube operating ring 012, so that the operator cannot hang the operating rod on the drop fuse tube operating ring 012, and cannot operate to pull open the drop fuse tube 011; when the vacuum interrupter 005 is in the closed position, and the drop fuse tube 011 is in In the open position, the interlocking baffle shaft 013 rotates counterclockwise to drive the interlocking baffle 014 to block the closing position of the drop fuse tube, so that the operator cannot push the drop fuse tube to the closing position, and cannot operate the push-closed drop fuse tube 011; when the vacuum interrupter 005 is in the open state, the interlocking baffle shaft 013 rotates clockwise to drive the interlocking baffle 014 to release the obstruction to the drop fuse tube operating ring 012 and the position, and the operator can freely operate the drop fuse tube 011 opening and closing operations through the drop fuse tube operating ring 012.

[0033] In this embodiment, the vacuum switch is composed of an operating mechanism 001, an insulating operating rod 002, a vacuum interrupter conductive connection 004, a vacuum interrupter 005, a current sensor 006, a voltage sensor 007, and an outlet terminal 008. The vacuum switch can be a vacuum circuit breaker or a vacuum switch such as a vacuum load switch.

[0034] In this embodiment, the drop fuse tube 011 may be a jet drop fuse tube, a current limiting fuse, or a drop isolating switch;

[0035] In this embodiment, if the current sensor 006 or (and) the voltage sensor 007 detects that the three-phase current or (and) the three-phase voltage is abnormal, the detection result of the current sensor 006 or (and) the voltage sensor 007 can be transmitted to the controller, so that the controller sends a signal to drive the vacuum switch to open, so as to avoid abnormal operation of the power grid.

[0036] Those skilled in the art can understand that the accompanying drawings are only schematic diagrams of an embodiment, and the modules or processes in the accompanying drawings are not necessarily required to implement the present invention.

[0037] Those skilled in the art can understand that the modules in the device in the embodiment can be distributed in the device in the embodiment according to the description of the embodiment, or can be changed accordingly and located in one or more devices different from the embodiment. The modules in the above embodiment can be combined into one module, or can be further divided into multiple sub-modules.

[0038] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A column mounted vacuum switch-drop fuse combination switch, characterized in that: Each phase of the combination switch is composed of a phase vacuum switch and a phase drop-out fuse tube connected in series to form a complete combination switch for one phase; the insulating operating rod, the ground-supporting insulating column, the vacuum arc chamber conductive connection, the vacuum arc chamber, the current sensor, the voltage sensor, the outlet terminal, the ground-supporting insulating column reinforcement ribs, the drop-out fuse tube hanging shaft, the drop-out fuse tube, the drop-out fuse tube operating ring, the interlocking baffle shaft, and the interlocking baffle are all assembled or glued on the ground-supporting insulating column to form a complete one-phase combination switch assembly; there is a box body above the ground-supporting insulating column, and three ground-supporting insulating columns are installed on the box body, and the operating mechanism is installed inside the box body. The three phases of the vacuum switch are driven by an operating mechanism to form a three-phase linkage, and the drop-out fuse tube is a three-phase split-phase operation. The vacuum switch plays the role of breaking the load current and closing the load current up to the fault current; the drop-out fuse plays the role of breaking the overload current up to the fault current; if the drop-out fuse If it is replaced with a drop-out isolating switch, the drop-out isolating switch can play an electrical isolation role, and the drop-out fuse or the drop-out isolating switch has a visible isolating fracture of the column-mounted combination switch. When the combination switch is closed, the drop-out fuse tube is closed first, and then the vacuum switch fracture is closed; when the combination switch is opened, the normal rated current is disconnected by the vacuum switch fracture, and the drop-out fuse tube does not move; for abnormal overload current and even fault current, the drop-out fuse automatically melts and disconnects, and the drop-out fuse tube drops to form an isolating fracture. After that, the vacuum switch fracture decides whether to open the switch according to needs. There is an interlock between the vacuum switch and the drop-out fuse tube of the combination switch, and the vacuum switch has a locking function for the drop-out fuse tube; when the vacuum switch is in the open position, the drop-out fuse tube is in the unlocked state, and the opening and closing operations can be performed; when the vacuum switch is in the closed position, the drop-out fuse tube is in the locked state, and the opening and closing operations cannot be performed.

2. The column mounted vacuum switch-drop fuse combination switch according to claim 1, characterized in that: The combination switch is a three-phase integrated structure.

3. The column mounted vacuum switch-drop fuse combination switch according to claim 1, characterized in that: The operating mechanism drives the insulating operating rod in the three-phase ground-supported insulating column to move up and down, thereby driving the conductive connection of the vacuum interrupter and the horizontal left and right movement of the moving contact in the vacuum interrupter to realize the opening and closing operation of the vacuum interrupter. The accessories, current sensor, voltage sensor, and output terminal together constitute a vacuum switch. Such an operating mechanism drives the three-phase vacuum interrupter to perform opening and closing operations by operating the three-phase insulating operating rod, so this vacuum switch is three-phase linked.

4. The column mounted vacuum switch-drop fuse combination switch according to claim 1, characterized in that: The opening and closing operations of the drop-out fuse tube are performed in phases by manually pushing and pulling the operating ring.

5. The column mounted vacuum switch-drop fuse combination switch according to claim 1, characterized in that: The vacuum switch is composed of an operating mechanism, an insulating operating rod, a vacuum interrupter conductive connection, a vacuum interrupter, a current sensor, a voltage sensor, and an outlet terminal. The vacuum switch is a vacuum circuit breaker or a vacuum load switch.

6. The column mounted vacuum switch-drop fuse combination switch according to claim 1, characterized in that: The drop fuse tube is a jet drop fuse tube, a current limiting fuse or a drop isolating switch.

7. The column mounted vacuum switch-drop fuse combination switch according to claim 1, characterized in that: If the current sensor and / or the voltage sensor detects that the three-phase current and / or the three-phase voltage are abnormal, the detection results of the current sensor and / or the voltage sensor are transmitted to the controller, so that the controller sends a signal to drive the vacuum switch to open to avoid abnormal operation of the power grid.

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