CN114420496A - DC load switch - Google Patents
DC load switch Download PDFInfo
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- CN114420496A CN114420496A CN202111591898.0A CN202111591898A CN114420496A CN 114420496 A CN114420496 A CN 114420496A CN 202111591898 A CN202111591898 A CN 202111591898A CN 114420496 A CN114420496 A CN 114420496A
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- 230000007246 mechanism Effects 0.000 claims abstract description 54
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- 239000012212 insulator Substances 0.000 claims abstract description 7
- 238000007664 blowing Methods 0.000 claims description 16
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
- H01H33/60—Switches wherein the means for extinguishing or preventing the arc do not include separate means for obtaining or increasing flow of arc-extinguishing fluid
- H01H33/66—Vacuum switches
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
- H01H33/02—Details
- H01H33/04—Means for extinguishing or preventing arc between current-carrying parts
- H01H33/18—Means for extinguishing or preventing arc between current-carrying parts using blow-out magnet
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
- H01H33/60—Switches wherein the means for extinguishing or preventing the arc do not include separate means for obtaining or increasing flow of arc-extinguishing fluid
- H01H33/66—Vacuum switches
- H01H33/6606—Terminal arrangements
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
- H01H33/60—Switches wherein the means for extinguishing or preventing the arc do not include separate means for obtaining or increasing flow of arc-extinguishing fluid
- H01H33/66—Vacuum switches
- H01H33/664—Contacts; Arc-extinguishing means, e.g. arcing rings
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
- H01H33/60—Switches wherein the means for extinguishing or preventing the arc do not include separate means for obtaining or increasing flow of arc-extinguishing fluid
- H01H33/66—Vacuum switches
- H01H33/666—Operating arrangements
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- Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
Abstract
The invention relates to a direct-current load switch, which comprises a rack, wherein a main loop module is arranged on the rack, the main loop module comprises a first solid-sealed polar pole and a second solid-sealed polar pole, the first solid-sealed polar pole and the second solid-sealed polar pole are connected in series, the first solid-sealed polar pole and the second solid-sealed polar pole respectively comprise an insulator and a fracture component arranged in the insulator, the fracture component comprises a moving contact and a static contact, the moving contact is connected with an insulating pull rod, and the insulating pull rod is connected with an operating mechanism for driving the fracture component to be switched on and switched off; the wire outlet end of the first solid-sealed polar pole is in conductive connection with the wire inlet end of the second solid-sealed polar pole; the direct-current load switch also comprises a transfer capacitor, and the whole body is connected in parallel with the transfer capacitor after the first solid-sealed polar pole and the second solid-sealed polar pole are connected in series; through the double-break structure, under the condition of meeting the short-circuit current of the cut-off direct current system, the condition that the cut-off failure is caused by the restriking breakdown after the break is in arc can be avoided.
Description
Technical Field
The invention relates to the technical field of vacuum switches, in particular to a direct-current load switch.
Background
The medium-voltage direct-current load switch is used as a switching device for bearing, opening and closing medium-voltage direct-current operation loop rated current and short-time overload current in medium-voltage direct-current cut-off equipment, and is an important means for improving the stability, reliability and flexibility of a direct-current power distribution system. According to the working principle of the DC load switch, the DC load switch can be divided into a mechanical type, an all-solid-state type and a mixed type DC load switch.
Because direct current does not possess the characteristic of the zero crossing point naturally like alternating current, direct current load switch break short-circuit current at present stage mostly passes through the mode of artificial manufacturing zero crossing point, for example a magnetic coupling type distribution network mechanical type load switch cabinet that patent document with grant publication number CN212210276U discloses, its fast switch includes utmost point post, has the fracture in the utmost point post, is equipped with a pair of contact finger on the utmost point post, a pair of contact finger is pegged graft with a pair of contact box in the cabinet body, but this kind of direct current load switch has fracture voltage after mechanical switch opens to increase fast, leads to the fracture to heavily to puncture, thereby causes the direct current to break the circumstances of failing. Therefore, the design of the rapid switch handcart directly influences the speed of the load switch for switching on and off the short-circuit current and the switching on and off reliability. Meanwhile, the existing mainstream medium-voltage direct-current switching-on and switching-off equipment has bottlenecks of high cost, large size and the like, and cannot meet the large-scale application requirements of direct-current power distribution network construction.
Disclosure of Invention
The invention aims to provide a direct-current load switch to solve the problem that the existing direct-current load switch is easy to cause direct-current on-off failure due to fracture re-breakdown.
The technical scheme of the direct current load switch is as follows:
a direct current load switch comprises a rack, wherein a main loop module is arranged on the rack and comprises a first solid-sealed polar pole and a second solid-sealed polar pole, the first solid-sealed polar pole and the second solid-sealed polar pole are connected in series, the first solid-sealed polar pole and the second solid-sealed polar pole respectively comprise an insulator and a fracture component arranged in the insulator, the fracture component comprises a moving contact and a static contact, the moving contact is connected with an insulating pull rod, and the insulating pull rod is connected with an operating mechanism for driving the fracture component to be switched on and off; the wire outlet end of the first solid-sealed polar pole is in conductive connection with the wire inlet end of the second solid-sealed polar pole; the direct-current load switch also comprises a transfer capacitor, and the first solid-sealed polar pole and the second solid-sealed polar pole are connected in series and then are integrally connected in parallel with the transfer capacitor.
Has the advantages that: the first solid-sealed polar pole and the second solid-sealed polar pole are connected in series on the main loop to form a double-fracture structure, so that the voltage borne by a single fracture is reduced, meanwhile, the fault current is ensured to be quickly transferred to zero passage through the parallel transfer capacitor, and the condition that the fracture fails to be disconnected due to the fact that after-arc restriking breakdown occurs on the fracture can be avoided under the condition that the short-circuit current of a direct-current system is met; and the bidirectional on-off can be realized, the current direction does not need to be judged before the on-off, and the control is simple.
Furthermore, the first solid-sealed polar pole and the second solid-sealed polar pole extend vertically, the first solid-sealed polar pole and the second solid-sealed polar pole are arranged on the left and right sides, the wire inlet end of the first solid-sealed polar pole is located on the upper side of the wire outlet end, the wire outlet end of the second solid-sealed polar pole is located on the upper side of the wire inlet end, the wire inlet end of the first solid-sealed polar pole is provided with a wire inlet contact arm extending forwards, the wire outlet end of the second solid-sealed polar pole is provided with a wire outlet contact arm extending forwards, and the transfer capacitor is located on the rear side of the wire inlet contact arm.
Has the advantages that: the two solid-sealed polar columns are arranged on the left and right, and the incoming line contact arm, the outgoing line contact arm and the transfer capacitor cloth are respectively arranged on the front side and the rear side, so that the structural arrangement is compact, and the occupied space of equipment is favorably reduced; and the contact can be conveniently arranged on the contact arm through the arrangement of the forward incoming line contact arm and the outgoing line contact arm, so that the main loop module is conveniently connected with the direct current system.
Further, the actuator is located on the lower side of the main circuit module.
Has the advantages that: the operating mechanism is positioned below the two solid-sealed polar poles, a transmission mechanism can be conveniently arranged between the operating mechanism and the vertically extending solid-sealed polar poles, and the stable and reliable use of the transmission mechanism is facilitated.
Furthermore, the operating mechanism is a repulsion operating mechanism, the direct current load switch comprises an operating mechanism power supply module for supplying power to the repulsion operating mechanism, and the operating mechanism power supply module comprises a thyristor assembly connected with a coil of the repulsion operating mechanism, an operating mechanism power supply capacitor connected with the thyristor assembly and a power supply source used for being connected with an external circuit to charge the operating mechanism power supply capacitor.
Has the advantages that: the repulsion operating mechanism is adopted to drive the fracture assembly to be opened and closed, the structure is simple, and the opening speed is high.
Furthermore, the power supply capacitor of the operating mechanism is positioned at the rear side of the repulsion operating mechanism, the rear side of the main circuit module is provided with a thyristor compartment, the thyristor compartment is positioned at the upper side of the power supply capacitor of the operating mechanism, and the thyristor component is positioned in the thyristor compartment.
Has the advantages that: the operating mechanism power supply capacitor is arranged on the rear side of the repulsion operating mechanism, wiring is convenient, meanwhile, as the voltage of the thyristor assembly is not high, the repulsion operating mechanism and the operating mechanism power supply capacitor need to bear the voltage on the main loop, and the current and the voltage are larger, the thyristor assembly is arranged on the upper side of the operating mechanism power supply capacitor and is positioned on the rear side of the main loop module, and is independently arranged in the thyristor compartment, and therefore the influence of the high voltage on the repulsion operating mechanism and the operating mechanism power supply capacitor on the thyristor assembly is reduced.
Further, the upper side of the thyristor compartment is provided with a power supply compartment, the power supply is arranged in the power supply compartment, and the transfer capacitor is arranged above the power supply compartment.
Has the advantages that: the power supply is independently arranged in the power supply compartment, so that the influence of high voltage on the transfer capacitor on the power supply is reduced.
Further, the bottom of the rack is provided with a roller, and the direct current load switch is of a removable handcart structure.
Has the advantages that: through forming removable handcart structure, with the major loop module and transfer capacitor integration at same handcart, simplify the mode of connection, reduce the volume, the easy access.
Furthermore, the solid-sealed polar pole is a magnetic arc-blowing solid-sealed polar pole, the magnetic arc-blowing solid-sealed polar pole comprises a magnetic arc-blowing module which is poured together with the fracture component, the magnetic arc-blowing module comprises a magnetic field generator, and the magnetic field generator is used for generating a transverse magnetic field between fractures so as to cause current oscillation zero crossing.
Has the advantages that: the magnetic arc-blowing solid-sealed pole can enable the current to quickly transfer to zero on the premise of ensuring insulation, and the short-circuit fault of the system can be eliminated.
Furthermore, the moving contact and the static contact are both transverse magnetic structures.
Has the advantages that: the moving contact and the static contact in the vacuum arc extinguish chamber adopt a transverse magnetic structure, so that the switching-on and switching-off reliability is ensured, and the service life of the solid-sealed polar pole is prolonged.
Furthermore, one electrode of the transfer capacitor is in conductive connection with the wire inlet end of the first solid-sealed polar pole, and the other electrode of the transfer capacitor is in conductive connection with the wire outlet end of the second solid-sealed polar pole.
Has the advantages that: two electrodes of the transfer capacitor are directly in conductive connection with the wire inlet end of the first solid-sealed polar pole and the wire outlet end of the second solid-sealed polar pole, so that the transfer capacitor and the main circuit module are connected in parallel, and the compact arrangement is facilitated.
Drawings
Fig. 1 is a first perspective view of a dc load switch according to embodiment 1 of the present invention;
FIG. 2 is a front view of FIG. 1;
fig. 3 is a second schematic perspective view of the dc load switch according to embodiment 1 of the present invention;
fig. 4 is a schematic view of a transmission structure of the roller and the stepping motor in fig. 1.
In the figure: 1. a power supply; 2. a discharge resistor; 3. a switching-on capacitor; 4. a charged display; 5. an emergency discharge device; 6. a switching-off capacitor; 7. a voltage sensor; 8. a discharge contactor; 9. a transfer capacitor; 10. a thyristor assembly; 12. a frame; 13. a repulsion operating mechanism; 14. a first solid-sealed polar pole; 15. an incoming line contact arm; 16. an outgoing line contact arm; 17. a connecting row; 18. an incoming line contact; 19. an outlet contact; 21. a second embedded pole; 22. a stepping motor; 23. a driving wheel; 24. a drive shaft; 25. and a roller.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the detailed description and specific examples, while indicating the preferred embodiment of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
It is noted that relational terms such as "first" and "second," and the like, which may be present in embodiments of the present invention, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, terms such as "comprises," "comprising," or any other variation thereof, which may be present, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the recitation of "comprising an … …" or the like that may occur does not exclude the presence of additional like elements in a process, method, article, or apparatus that comprises the element.
In the description of the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" when they are used are to be construed broadly, e.g., as meaning a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; either directly or indirectly through intervening media, or may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those skilled in the art from specific situations.
In the description of the present invention, unless otherwise specifically stated or limited, the term "provided" may be used in a broad sense, for example, the object of "provided" may be a part of the body, or may be arranged separately from the body and connected to the body, and the connection may be detachable or non-detachable. The specific meaning of the above terms in the present invention can be understood by those skilled in the art from specific situations.
The present invention will be described in further detail with reference to examples.
as shown in fig. 1, fig. 2, and fig. 3, the dc load switch is a removable handcart structure, and includes a frame 12, a main circuit module for connecting a main current path in a cabinet body of the dc system equipment is disposed on the frame 12, the main circuit module includes a first solid-sealed terminal 14 and a second solid-sealed terminal 21, and a transfer capacitor 9, an operating mechanism, and an operating mechanism power supply module are further integrated on the frame 12.
The frame 12 is provided with a square base, four idler wheels 25 are arranged at four corners of the base, a vertical partition plate is arranged in the middle of the base, a plurality of transverse partition plates are arranged on a rear side plate face of the vertical partition plate, and the main loop module and the operating mechanism are arranged on the front side of the vertical partition plate.
The first solid-sealed polar pole 14 and the second solid-sealed polar pole 21 both extend up and down, and the first solid-sealed polar pole 14 and the second solid-sealed polar pole 21 are arranged left and right. The first solid-sealed polar pole 14 and the second solid-sealed polar pole 21 are magnetic arc-blowing solid-sealed polar poles, each magnetic arc-blowing solid-sealed polar pole comprises an insulator, a fracture component and a magnetic arc-blowing module, the fracture component and the magnetic arc-blowing module are integrally cast and fixed together, the fracture component is a vacuum arc-extinguishing chamber, the vacuum arc-extinguishing chamber comprises a moving contact and a static contact, a fracture is formed between the moving contact and the static contact, the moving contact and the static contact are of a transverse magnetic structure, the magnetic arc-blowing module comprises two magnetic field generators connected in series, and the magnetic field generators are used for generating a transverse reinforcing magnetic field between the fractures so as to enable current between the fractures to rapidly oscillate and pass through zero when breaking current is caused. The specific structure of the magnetic arc blowing module is the prior art, and the detailed description is not provided in this embodiment.
The first solid-sealed polar pole 14 and the second solid-sealed polar pole 21 are respectively provided with a wire inlet end and a wire outlet end, the wire inlet end of the first solid-sealed polar pole 14 is positioned on the upper side of the wire outlet end, the wire outlet end of the second solid-sealed polar pole 21 is positioned on the upper side of the wire inlet end, and the wire outlet end of the first solid-sealed polar pole 14 and the wire inlet end of the second solid-sealed polar pole 21 are in conductive connection through the connecting row 17 so as to realize that the first solid-sealed polar pole 14 is connected with the second solid-sealed polar pole 21 in series. An incoming line contact arm 15 extending forwards is arranged at an incoming line end of the first solid-sealed polar pole 14, an outgoing line contact arm 16 extending forwards is arranged at an outgoing line end of the second solid-sealed polar pole 21, an incoming line contact 18 is arranged at an end portion of the incoming line contact arm 15, an outgoing line contact 19 is arranged at an end portion of the outgoing line contact arm 16, the incoming line contact 18 and the outgoing line contact 19 are used for realizing loop conduction with an adaptive conductor on a main through current circuit of the direct current system, and current on the main through current circuit of the direct current system flows in from the incoming line contact 18 and flows out from the outgoing line contact 19.
The moving contacts of the first solid-sealed polar pole 14 and the second solid-sealed polar pole 21 are connected with an insulating pull rod, the insulating pull rod is connected with an operating mechanism, and the operating mechanism is used for driving the fracture component to be switched on and off. The operating mechanism is a repulsion operating mechanism 13, the repulsion operating mechanism 13 is fixed above the base, and the first solid-sealed polar pole 14 and the second solid-sealed polar pole 21 are positioned above the repulsion operating mechanism 13.
The transfer capacitor 9 is arranged at the top of the rack 12, the transfer capacitor 9 is positioned at the rear side of the incoming line contact arm 15, two wiring ends of the transfer capacitor 9 are respectively positioned above the first solid-sealed polar pole 14 and the second solid-sealed polar pole 21, so that one electrode of the transfer capacitor 9 is in conductive connection with the incoming line end of the first solid-sealed polar pole 14 through a conductive bar, the other electrode is in conductive connection with the outgoing line end of the second solid-sealed polar pole 21 through a conductive bar, and the first solid-sealed polar pole 14 and the second solid-sealed polar pole 21 are connected in series and then integrally connected in parallel with the transfer capacitor 9. Moreover, the distance between the transfer capacitor 9 and the discontinuity does not exceed 2 m.
A power supply capacitor compartment, a discharge module compartment, a thyristor compartment and a power supply compartment are sequentially formed behind the repulsion operating mechanism 13 and the main loop module through a vertical partition plate and a transverse partition plate of the frame 12 from bottom to top, and the transfer capacitor 9 is positioned above the power supply compartment.
The operating mechanism power supply module is used for supplying power to the repulsion operating mechanism 13, and comprises a thyristor assembly 10 connected with a coil of the repulsion operating mechanism 13, an operating mechanism power supply capacitor connected with the thyristor assembly 10, and a power supply source 1 connected with an external circuit to charge the operating mechanism power supply capacitor. The thyristor component 10 comprises a closing thyristor component and an opening thyristor component, and the operating mechanism power supply capacitor comprises a closing capacitor 3 and an opening capacitor 6.
The operating mechanism power supply capacitor is located in the power supply capacitor compartment, the thyristor component 10 is located in the thyristor compartment, and the power supply 1 is arranged in the power supply compartment, so that the operating mechanism power supply capacitor is located on the rear side of the repulsion operating mechanism 13, the thyristor compartment is located on the upper side of the operating mechanism power supply capacitor, and the power supply 1 is arranged in the power supply compartment, so that the influence of a high-voltage device on a low-voltage device is reduced.
The direct current load switch also comprises a discharging module, wherein the discharging module comprises a discharging contactor 8, a discharging resistor 2, a voltage sensor 7, an electrified display 4 and an emergency discharging device 5. The discharge contactor 8, the discharge resistor 2, and the voltage sensor 7 are disposed in the discharge module compartment, and the live display 4 and the emergency discharge device 5 are disposed in the power supply capacitor compartment.
The positive pole of the power supply 1 is connected with one end of the emergency discharge device 5, one end of the discharge contactor 8 and the positive pole of the closing capacitor 3 through cables, the other end of the discharge contactor 8 is connected to the discharge resistor 2 through cables, and the negative pole of the power supply 1 is connected with the other end of the emergency discharge device 5, the other end of the discharge resistor 2 and the negative pole of the closing capacitor 3 through cables. The closing thyristor assembly is connected with the positive electrode of the closing capacitor 3 through a cable, the other end of the closing thyristor assembly is connected with the positive electrode of the closing coil of the repulsive force operating mechanism 13 through a cable, and the negative electrode of the closing coil of the repulsive force operating mechanism 13 is connected with the negative electrode of the closing capacitor 3 through a cable.
The positive pole of the power supply 1 is also connected with the positive pole of the opening capacitor 6 through a cable, and the negative pole of the power supply 1 is also connected with the negative pole of the opening capacitor 6 through a cable. The opening thyristor assembly is connected with the positive electrode of the opening capacitor 6 through a cable, the other end of the opening thyristor assembly is connected with the positive electrode of the opening coil of the repulsion operating mechanism 13 through the cable, and the negative electrode of the opening coil is connected with the negative electrode of the opening capacitor 6 through the cable.
The voltage sensor 7 is used for detecting voltages at two ends of the closing capacitor 3 and the opening capacitor 6 in real time. The charging display 4 is used for displaying the charging state of the closing capacitor 3 and the opening capacitor 6.
The negative pole of the opening capacitor 6 is connected to the positive pole of the magnetic field generator through a cable, and the negative pole of the magnetic field generator is connected to the positive pole of the opening capacitor 6 through a cable.
As shown in fig. 4, a stepping motor 22 is further disposed on the base of the frame 12, the stepping motor 22 drives a driving wheel 23 to rotate, the driving wheel 23 drives a driven wheel to rotate, the driven wheel drives a transmission shaft 24 to rotate, and the transmission shaft 24 drives a roller 25 to rotate, so as to realize the trolley walking.
When the direct-current load switch is used, the pushing speed of the stepping motor 22 is set through the button of the control panel, the starting button of the control panel is clicked after the setting is finished, the stepping motor 22 is controlled through the control panel to drive the driving wheel 23 to rotate, the driving wheel 23 drives the driven wheel and the transmission shaft 24, and then the roller 25 is driven to automatically push the direct-current load switch to the working position. The inlet contact 18 is fitted with a pressure sensor which will send a signal when the dc load switch is moved to the operating position, cutting off the power supply to the stepper motor 22 and stopping the dc load switch.
When a medium-voltage direct-current system normally operates, rated current and short-time overload current need to be cut off through a load switch, and the specific process is as follows: when the direct current load switch is switched on and is located at a working position, the first solid-sealed polar pole 14 and the second solid-sealed polar pole 21 bear the current of a main loop, the power supply 1 charges the switching-off capacitor 6 and the switching-on capacitor 3, the switching-off capacitor 6 and the switching-on capacitor 3 are provided with the voltage sensors 7, and when the fact that the capacitance voltages of the switching-off capacitor 6 and the switching-on capacitor 3 reach set values is detected, signals are sent out, the power supply 1 is switched off, and charging is stopped. And the opening capacitor 6 and the closing capacitor 3 are provided with passive sensors, and when the direct current load switch is powered off, a trigger signal enables the opening capacitor 6 and the closing capacitor 3 to discharge.
When the direct current system requires to cut off the direct current, the opening thyristor component is triggered to enable the opening capacitor 6 to start discharging to the coil in the repulsion operating mechanism 13, and the repulsion operating mechanism 13 drives the first solid-sealed polar pole 14 and the second solid-sealed polar pole 21 to perform opening operation. When the fractures in the first solid-sealed polar pole 14 and the second solid-sealed polar pole 21 are separated by a certain distance, the magnetic field generator is conducted, the reverse energy on the opening capacitor 6 is transferred to the magnetic field generator to generate a high-frequency magnetic field, and the direct current is switched on and off.
When equipment needs to be overhauled, the discharging contactor 8 acts to conduct a discharging loop, energy on the opening capacitor 6 and the closing capacitor 3 is consumed on the discharging resistor 2 through the discharging contactor 8, after discharging is completed, the discharging loop can be cut off by cutting off the discharging contactor 8, the voltage on the voltage sensor 7 is displayed as '0', an indicator lamp on the electrified display 4 is turned off, the trolley can be overhauled at the moment, if an emergency situation occurs, the opening capacitor 6 and the closing capacitor 3 can be discharged by controlling the emergency discharging device 5, and safety accidents are avoided. When the trolley is overhauled, the button finger control/remote control stepping motor 22 on the control panel can drive the driving wheel 23, the driving wheel 23 drives the driven wheel and the transmission shaft 24, the roller 25 is driven to automatically push the quick-opening and closing trolley to a test position, and automatic cabinet-out overhauling is completed.
The design of the double fractures can greatly improve the voltage-withstanding characteristic after the arc of the vacuum arc-extinguishing chamber, reduce the voltage borne on a single fracture, prevent the fracture from breaking after the arc, avoid the situation of breaking failure caused by the restriking breakdown after the arc of the fracture under the condition of meeting the short-circuit current of a breaking system, realize two-way breaking, avoid judging the current direction before breaking and have simple control; the moving and static contacts in the vacuum arc extinguish chamber adopt a transverse magnetic structure, so that the breaking reliability is ensured, and the service life of the solid-sealed polar pole is prolonged; the magnetic arc blowing module generates a transverse strengthening magnetic field between fractures to realize the quick oscillation zero crossing of current; the transfer capacitor 9 does not need to be precharged, so that the safety accidents caused by long-term electrification can be avoided while the fault current is rapidly transferred; meanwhile, a mechanical on-off scheme is adopted, the switch body does not use power electronic devices, does not contain higher-price fully-controlled power electronic devices such as IEGT (injection enhanced Gate transistor), IGCT (Integrated Gate commutated thyristor) and the like, the cost is greatly reduced, and meanwhile, the miniaturized design can be realized; the on-state loss is low, the structural design is compact, and the requirements of easy operation and good economical efficiency of the load switch equipment for the medium-voltage direct-current power distribution system are met; the structure of the movable handcart adopts a modularized and miniaturized design, and the cost and the volume are reduced by about 50 percent compared with the existing load switch scheme on the market.
the difference between this embodiment and embodiment 1 is that in embodiment 1, the outlet end of the first solid-sealed polar pole and the inlet end of the second solid-sealed polar pole are electrically connected through the connecting row. In this embodiment, the wire outlet end of the first solid-sealed polar pole is electrically connected with the wire inlet end of the second solid-sealed polar pole through a conducting wire.
the present embodiment is different from embodiment 1 in that the first embedded pole and the second embedded pole in embodiment 1 are arranged left and right. In this embodiment, the first embedded pole and the second embedded pole are arranged one above the other.
the difference between this embodiment and embodiment 1 is that in embodiment 1, the outlet end of the first embedded pole is electrically connected to the inlet end of the second embedded pole. In this embodiment, the wire inlet end of the first solid-sealed polar pole is electrically connected to the wire outlet end of the second solid-sealed polar pole, and the current on the main current-carrying circuit of the dc system flows in from the wire inlet end of the second solid-sealed polar pole and flows out from the wire outlet end of the first solid-sealed polar pole.
the present embodiment is different from embodiment 1 in that the actuator in embodiment 1 is located below the main circuit module. In this embodiment, the operating mechanism is located at the rear side of the main circuit module, and the thyristor assembly, the power supply and the power supply capacitor are disposed above the operating mechanism.
Embodiment 6 of the dc load switch of the present invention:
this embodiment differs from embodiment 1 in that the thyristor compartment and the power supply compartment in embodiment 1 are formed by a horizontal partition and a vertical partition on the frame. In the embodiment, the rack is of a frame structure, and the thyristor compartment and the power supply compartment are formed by cross beams and longitudinal beams of the frame structure.
Embodiment 7 of the dc load switch of the present invention:
the present embodiment is different from embodiment 1 in that the dc load switch in embodiment 1 is a removable handcart structure. In this embodiment, the dc load switch is fixed in the dc system device.
Embodiment 8 of the dc load switch of the present invention:
the difference between this embodiment and embodiment 1 is that in embodiment 1, one electrode of the transfer capacitor is conductively connected to the wire inlet end of the first embedded pole through the conductive bar, and the other electrode is conductively connected to the wire outlet end of the second embedded pole through the conductive bar. In this embodiment, one electrode of the transfer capacitor is electrically connected to the wire inlet end of the first embedded pole through a cable, and the other electrode is electrically connected to the wire outlet end of the second embedded pole through a cable.
Finally, it should be noted that the above-mentioned embodiments are only preferred embodiments of the present invention, and not intended to limit the present invention, and although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications and equivalents can be made in the technical solutions described in the foregoing embodiments without inventive effort, or some technical features of the present invention may be substituted with equivalents. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A direct current load switch comprises a rack (12) and is characterized in that a main loop module is arranged on the rack (12), the main loop module comprises a first solid-sealed polar pole (14) and a second solid-sealed polar pole (21), the first solid-sealed polar pole (14) is connected with the second solid-sealed polar pole (21) in series, the first solid-sealed polar pole (14) and the second solid-sealed polar pole (21) both comprise insulators and fracture components arranged in the insulators, each fracture component comprises a moving contact and a static contact, the moving contact is connected with an insulating pull rod, and the insulating pull rod is connected with an operating mechanism for driving the fracture components to be separated and closed; the wire outlet end of the first solid-sealed polar pole (14) is in conductive connection with the wire inlet end of the second solid-sealed polar pole (21); the direct-current load switch also comprises a transfer capacitor (9), and the first solid-sealed polar pole (14) and the second solid-sealed polar pole (21) are connected in series and then are integrally connected with the transfer capacitor (9) in parallel.
2. The direct current load switch according to claim 1, wherein the first embedded pole (14) and the second embedded pole (21) both extend vertically, the first embedded pole (14) and the second embedded pole (21) are arranged in a left-right manner, a wire inlet end of the first embedded pole (14) is located on the upper side of a wire outlet end, a wire outlet end of the second embedded pole (21) is located on the upper side of a wire inlet end, a wire inlet contact arm (15) extending forwards is arranged at the wire inlet end of the first embedded pole (14), a wire outlet contact arm (16) extending forwards is arranged at the wire outlet end of the second embedded pole (21), and the transfer capacitor (9) is located on the rear side of the wire inlet contact arm (15).
3. The dc load switch of claim 2, wherein the actuator is located on the underside of the main circuit module.
4. A dc load switch according to claim 3, wherein the actuator is a repulsive actuator (13), the dc load switch comprises an actuator power supply module for supplying power to the repulsive actuator (13), the actuator power supply module comprises a thyristor assembly (10) connected to a coil of the repulsive actuator (13), an actuator power supply capacitor connected to the thyristor assembly (10), and a power supply source (1) for connection to an external circuit for charging the actuator power supply capacitor.
5. A DC load switch according to claim 4, characterized in that the actuator supply capacitor is located at the rear side of the repulsive actuator (13), the rear side of the main circuit module is provided with a thyristor compartment located at the upper side of the actuator supply capacitor, and the thyristor assembly (10) is located in the thyristor compartment.
6. A DC load switch according to claim 5, characterized in that the upper side of the thyristor compartment is provided with a power supply compartment, the power supply (1) is arranged in the power supply compartment and the transfer capacitor (9) is arranged above the power supply compartment.
7. The direct current load switch according to any one of claims 1 to 6, wherein the roller (25) is arranged at the bottom of the frame (12), and the direct current load switch is of a removable handcart structure.
8. The direct-current load switch according to any one of claims 1 to 6, wherein the embedded pole is a magnetic arc-blowing embedded pole, the magnetic arc-blowing embedded pole comprises a magnetic arc-blowing module cast with the fracture assembly, and the magnetic arc-blowing module comprises a magnetic field generator for generating a transverse magnetic field between the fractures.
9. The dc load switch according to claim 8, wherein the moving contact and the stationary contact are both of a transverse magnetic structure.
10. The direct current load switch according to any one of claims 1 to 6, wherein one electrode of the transfer capacitor (9) is conductively connected to the inlet terminal of the first encapsulated pole (14) and the other electrode is conductively connected to the outlet terminal of the second encapsulated pole (21).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111591898.0A CN114420496A (en) | 2021-12-23 | 2021-12-23 | DC load switch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111591898.0A CN114420496A (en) | 2021-12-23 | 2021-12-23 | DC load switch |
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| Publication Number | Publication Date |
|---|---|
| CN114420496A true CN114420496A (en) | 2022-04-29 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202111591898.0A Pending CN114420496A (en) | 2021-12-23 | 2021-12-23 | DC load switch |
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| CN (1) | CN114420496A (en) |
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| CN112713541A (en) * | 2020-12-11 | 2021-04-27 | 平高集团有限公司 | Coupling device for direct current load switch |
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