CN217061898U - Direct current breaker and rapid mechanical switching equipment in flexible direct current power grid thereof - Google Patents
Direct current breaker and rapid mechanical switching equipment in flexible direct current power grid thereof Download PDFInfo
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- CN217061898U CN217061898U CN202220780064.8U CN202220780064U CN217061898U CN 217061898 U CN217061898 U CN 217061898U CN 202220780064 U CN202220780064 U CN 202220780064U CN 217061898 U CN217061898 U CN 217061898U
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Abstract
The utility model belongs to the technical field of the circuit breaker, it provides a quick mechanical switch equipment among direct current circuit breaker and flexible direct current electric wire netting thereof. A fast mechanical switching device in a flexible direct current electrical network comprising: the vacuum arc extinguish chamber is provided with a fixed contact and a movable contact; and the driving mechanism is connected with the moving contact of the vacuum arc extinguish chamber and can drive the moving contact to leave or contact the fixed contact. A DC circuit breaker includes: a plurality of direct current breaker modules that establish ties in proper order, direct current breaker module includes: the main loop is formed by connecting the rapid mechanical switch equipment and a first full-bridge structure in series; the transfer branch is formed by connecting a plurality of second full-bridge structures in series; and the lightning arrester forms an energy consumption loop. Through the technical scheme, the rapid mechanical switching equipment in the flexible direct-current power grid can be in a modular series design, so that the equipment can be applied to the field of ultrahigh-voltage and ultrahigh-voltage level direct-current power transmission; millisecond shutdown of the circuit may also be implemented.
Description
Technical Field
The utility model relates to a circuit breaker technical field, in particular to direct current circuit breaker and quick mechanical switch equipment among flexible direct current electric wire netting thereof.
Background
The direct current power grid technology based on flexible direct current transmission is an effective means for solving new energy grid connection and consumption, and is rapidly developed in recent years. Due to the lower damping of the dc system, the current in the short circuit of the dc system rises very fast compared to the ac transmission system. High-voltage power electronic equipment core semiconductor assemblies such as flexible direct current converter valves and high-voltage direct current circuit breakers have poor fault current tolerance, and if rapid protection is not implemented within milliseconds, equipment safety is difficult to guarantee.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a quick mechanical switch equipment among flexible direct current electric wire netting has realized the quick protection to transmission of electricity system.
In order to achieve the above object, the present invention provides the following technical solutions:
in one aspect, a fast mechanical switching apparatus in a flexible direct current electrical network, comprising: the vacuum arc extinguish chamber is provided with a fixed contact and a movable contact; the driving mechanism is connected with the moving contact of the vacuum arc extinguish chamber, and the driving mechanism can drive the moving contact to leave or contact the fixed contact.
In the above fast mechanical switch device in a flexible dc power grid, optionally, the driving mechanism includes a movable conducting rod and an electromagnetic repulsion operating mechanism, one end of the movable conducting rod is directly connected to the movable contact, and the electromagnetic repulsion operating mechanism is used to control the movable conducting rod to move.
In the above described fast mechanical switching device in a flexible dc power grid, optionally, the electromagnetic repulsion operating mechanism includes: the device comprises a moving metal disc, a fixed metal disc, a coil, an energy storage capacitor and a control unit; the number of the fixed metal discs is two, the movable conducting rod simultaneously penetrates through the two fixed metal discs which are oppositely arranged, an opening coil and a closing coil are respectively arranged on the two fixed metal discs, and the opening coil and the closing coil are both positioned between the two fixed metal discs; the control unit is connected with the opening coil, the closing coil and the energy storage capacitor and is used for controlling the energy storage capacitor to supply power to the opening coil and the closing coil; the moving metal disc is arranged between the opening coil and the closing coil and fixedly connected with the moving conducting rod, and electromagnetic repulsion force generated when the closing coil or the opening coil is electrified can push the moving metal disc to move.
In the above fast mechanical switching device in the flexible dc power grid, optionally, the fast mechanical switching device further includes a buffer device, the buffer device is connected to the other end of the moving conductive rod, and when the moving contact leaves the stationary contact, the buffer device can buffer the moving conductive rod.
In the above fast mechanical switching device in the flexible dc power grid, optionally, the fast mechanical switching device further includes an embedded pole, and the embedded pole is wrapped outside the vacuum arc-extinguishing chamber; the solid-sealed polar pole is made of epoxy resin.
In the fast mechanical switching device in a flexible dc power grid as described above, optionally, a spring holding mechanism is further included, the spring holding mechanism is located below the closing coil, the spring holding mechanism is connected to the movable conducting rod, and the spring holding mechanism is used for holding the position of the movable conducting rod.
In the fast mechanical switching apparatus in a flexible direct current power grid as described above, optionally, the spring holding mechanism includes a connecting rod, a connecting block, a spring, and a base; two ends of the connecting rod are respectively hinged with the movable conducting rod and the connecting block, and the spring is arranged between the base and the connecting block; the stretching direction of the spring is vertical to the moving direction of the movable conducting rod, and the spring can be driven to stretch when the movable conducting rod moves;
in the above-mentioned fast mechanical switch device in a flexible dc power grid, optionally, the number of the spring retaining mechanisms is two, and the two spring retaining mechanisms are located on the same side of the electromagnetic repulsion operating mechanism and are symmetrically arranged with respect to the movable conducting rod.
In the above fast mechanical switching device in a flexible dc power grid, optionally, when the number of the vacuum interrupter is plural, the fast mechanical switching device further includes a plurality of rc voltage equalizing devices, each rc voltage equalizing device is used in cooperation with one of the vacuum interrupter, and the rc voltage equalizing devices include: voltage-sharing capacitor C g Parallel resistor R p And a series resistance R L (ii) a The voltage-sharing capacitor C g Is connected with the vacuum arc extinguish chamber in parallel; the parallel resistor R p Is connected with the vacuum arc extinguish chamber in parallel; the series resistor R L And the voltage-sharing capacitor C g And the vacuum arc extinguish chambers are connected in parallel after being connected in series.
In another aspect, a direct current circuit breaker includes: a plurality of direct current breaker modules that establish ties in proper order, direct current breaker module includes: the main loop is formed by connecting the rapid mechanical switching equipment in the flexible direct-current power grid and a first full-bridge structure in series; the transfer branch is formed by connecting a plurality of second full-bridge structures in series; and the lightning arrester forms an energy consumption loop.
The analysis can know, the utility model discloses a quick mechanical switch equipment among flexible direct current electric wire netting, its reliability is high, has realized cutting off fast high voltage direct current circuit. The equipment is core protection equipment of high-voltage power electronic equipment, and can realize quick isolation and bypass of faults; through the combined application of the technologies of the solid-sealed polar pole, the vacuum arc-extinguishing chamber, the resistance-capacitance voltage-sharing device, the electromagnetic repulsion operating mechanism, the hydraulic oil buffer device and the spring holding mechanism, the millisecond-level cut-off of the circuit is realized. The spring holding mechanism is arranged below the electromagnetic repulsion operating mechanism, and no insulating rod is arranged between a moving contact in the vacuum arc extinguish chamber solid seal and a moving conducting rod of the electromagnetic repulsion operating mechanism, so that the electromagnetic repulsion operating mechanism is in a high potential, the modularized series design of the equipment is realized, and the equipment can be applied to the field of ultrahigh voltage and ultrahigh voltage level direct current transmission.
Drawings
The accompanying drawings, which form a part of the specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and do not constitute a limitation on the scope of the invention. Wherein:
fig. 1 is a schematic structural diagram of a fast mechanical switching device in a flexible dc power grid according to an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of a spring holding mechanism according to an embodiment of the present invention.
Description of reference numerals:
1. a vacuum arc-extinguishing chamber; 2. solid-sealing the pole; 3. carrying out static contact; 4. a moving contact; 5. fixing the metal disc; 6. a movable conductive rod; 7. a brake separating coil; 8. a moving metal disc; 9. a closing coil; 10. a connecting rod; 11. connecting blocks; 12. a spring; 13. a base; 14. a resistance-capacitance voltage sharing device; 15. a cross bar.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments. Each example is provided by way of explanation of the invention, and not limitation of the invention. In fact, it will be apparent to those skilled in the art that modifications and variations can be made in the present invention without departing from the scope or spirit thereof. For instance, features illustrated or described as part of one embodiment, can be used with another embodiment to yield a still further embodiment. It is therefore intended that the present invention embrace such modifications and variations as fall within the scope of the appended claims and their equivalents.
In the description of the present invention, the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description of the present invention and do not require that the present invention must be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention. The terms "connected," "connected," and "disposed" used in the present invention should be understood broadly, and may be, for example, a fixed connection or a detachable connection; can be directly connected or indirectly connected through intermediate components; the connection may be a wired electrical connection, a wireless electrical connection, or a wireless communication signal connection, and a person skilled in the art can understand the specific meaning of the above terms according to specific situations.
As shown in fig. 1 and 2, according to an embodiment of the present invention, there is provided a fast mechanical switching device in a flexible direct current power grid, including: vacuum interrupter 1 and actuating mechanism. The vacuum arc extinguish chamber 1 is provided with a static contact 3 and a moving contact 4; the driving mechanism is connected with the moving contact 4 of the vacuum arc-extinguishing chamber 1, and the driving mechanism can drive the moving contact 4 to leave or contact the static contact 3, so that the opening or closing action of the rapid mechanical switch device is realized.
The vacuum arc extinguish chamber 1 mainly comprises an airtight insulating shell, a shielding system, a static contact 3, a movable contact 4, a corrugated pipe (playing a role in sealing and buffering) and the like, and has the functions of rapidly extinguishing an arc and inhibiting current after a medium-high voltage circuit is cut off a power supply through excellent insulating property of a vacuum environment in the vacuum arc extinguish chamber 1. The drive mechanism includes: a movable conducting rod 6 and an electromagnetic repulsion actuating mechanism. One end of the moving conductive rod 6 is directly connected with the moving contact 4, for example, screwed. The electromagnetic repulsion operating mechanism is used for controlling the movement of the movable conducting rod 6; the movable conducting rod 6 is made of metal. The electromagnetic repulsion operating mechanism comprises: the device comprises a moving metal disc 8, a fixed metal disc 5, a closing coil 9, an opening coil 7, an energy storage capacitor and a control unit. The number of the fixed metal discs 5 is two, the movable conducting rod 6 sequentially penetrates through the two fixed metal discs 5 which are oppositely arranged, coils are arranged on the two fixed metal discs 5 and are respectively an opening coil 7 and a closing coil 9, and the two coils are located between the two fixed metal discs 5. Referring to fig. 1, the coil above the moving metal disc 8 is an opening coil 7, and the coil below the moving metal disc 8 is a closing coil 9, that is, the opening coil 7 is close to the moving contact 4 relative to the closing coil 9. The control unit is connected with the energy storage capacitor and the two coils, and the control unit can control the energy storage capacitor to supply power to the two coils. The moving metal disc 8 is arranged between the two fixed metal discs 5 (namely two coils) and is fixedly connected with the moving conducting rod 6 so as to drive the moving conducting rod 6 to move when the moving metal disc 8 moves, electromagnetic repulsion generated when the opening coil 7 or the closing coil 9 is electrified can push the moving metal disc 8 to move, closing or breaking of the mechanical switching device is achieved, specifically, when the opening coil 7 or the closing coil 9 discharges energy storage capacitors, a magnetic field can be generated to form reverse acting force with induced current in the moving metal disc 8, and the opening coil 7 and the closing coil 9 are fixed, so that the moving metal disc 8 is far away from the opening coil 7 or the closing coil 9 to move, and closing or breaking of the mechanical switching device is achieved.
The driving mechanism adopts a double-layer spiral coil structure (namely the structure of a coil in the equipment, the structure is the same as that of the coil in the power transformer) and a repulsion plate (or called a moving metal plate 8), and the repulsion plate can be formed by coaxially sleeving and fixing an annular opening repulsion plate and an opening repulsion plate with a boss; the pre-charged energy storage capacitor is used as a power supply of the opening coil 7 or the closing coil 9, and pulse current lasting for a few milliseconds can be generated by discharging to the coil. The relevant parameters of the equipment can reach: the excitation time is 0.4ms, the acceleration is more than 3000g, the movement speed is 10-13m/s, the electric power is 100kN, and the movement time of 10mm is 1.8-1.9 ms. The driving mechanism can be provided with a plurality of groups of energy storage capacitors which are respectively used for switching off and switching on. Because the charging needs time, a plurality of groups of energy storage capacitors can be applied to different working conditions, for example, four groups of energy storage capacitors are configured and are respectively used for a quick brake-separating working condition, a standby quick brake-separating working condition, a slow brake-separating working condition and a brake-closing working condition. The control unit can discharge the energy storage capacitor corresponding to the working condition by controlling the power thyristor, the control unit receives an action command and sends a trigger pulse to the corresponding power thyristor, the power thyristor is conducted, and then the energy storage capacitor discharges to the opening coil 7 or the closing coil 9 to generate pulse electromagnetic force to drive the movable conducting rod 6 to move. The movable conducting rod 6 can be made of copper, so that the movable conducting rod has the through-current capacity and certain mechanical strength. The stationary metal plate 5 may be made of copper, and the movable metal plate 8 may be made of aluminum. The number of the control units may be two, and one control unit is respectively configured for the opening coil 7 and the closing coil 9.
The apparatus may further comprise: the buffer device is connected with the other end of the movable conducting rod 6, when the movable conducting rod 6 drives the movable contact 4 to leave the static contact 3, the buffer device can buffer the movable conducting rod 6, so that the speed of the movable conducting rod 6 which moves at a high speed is reduced to zero within a very short stroke (for example, 10 mm-12 mm), the opening resilience of the movable contact 4 of the vacuum arc extinguish chamber 1 is controlled to be reduced to an allowable range, and the phenomena of insulation breakdown and damage of a corrugated pipe caused by the large opening resilience between the movable contact 4 and the static contact 3 of the vacuum arc extinguish chamber 1 are avoided. Preferably, the buffer device is a hydraulic oil buffer device, the buffer stroke can be realized by 15mm, the speed range is larger than 12m/s, and the maximum impact force is 90 kN.
The apparatus may further comprise: the solid-sealed polar pole 2 is wrapped on the outer side of the vacuum arc-extinguishing chamber 1; the material is epoxy resin. In practical application, the solid-sealed polar pole 2 replaces an insulating support and a mechanical support on the original circuit breaker, so that the parts and the volume of the circuit breaker are greatly reduced, the integrated modularization is realized, and the circuit breaker is easy to install, free of maintenance, small in volume and more stable and reliable in voltage resistance. The equipment can adopt an epoxy resin automatic pressure gel forming process to package the vacuum arc-extinguishing chamber 1 and current-carrying elements such as an upper wire outlet seat, a lower wire outlet seat and the like into a whole. Because the epoxy resin with excellent material performance is selected, the mechanical, electrical and thermal aging resistance of the equipment is ensured, and the vacuum sealing performance is good, the insulating performance is reliable, the high and low temperature impact resistance and the mechanical impact resistance are good, the maintenance is free, the miniaturization is realized, the installation is easy, and the like.
The apparatus may further comprise: a spring retention mechanism located below the closing coil 9, for example between the closing coil 9 and the damping device, thus facilitating the use of multiple fast mechanical switches in series. The spring holding mechanism is connected to the movable conductor bar 6 for holding the position of the movable conductor bar 6. Specifically, the spring holding mechanism includes: connecting rod 10, connecting block 11, spring 12 and base 13. Two ends of a connecting rod 10 are respectively hinged with the movable conducting rod 6 and the connecting block 11, the connecting block 11 is T-shaped and is provided with a horizontal part and a vertical part, the vertical part is positioned in a cavity formed by a base 13, one end of the horizontal part is connected with the vertical part, the other end of the horizontal part is positioned outside the base 13 and is hinged with one end of the connecting rod 10, the other end of the connecting rod 10 is hinged with a cross rod 15 (one end of the cross rod), the cross rod 15 is sleeved on the movable conducting rod 6, and a spring 12 is positioned in the base 13 and is positioned between the side wall of the base 13 and the connecting block 11; the telescopic direction of the spring 12 is perpendicular to the moving direction of the movable conducting rod 6, and when the movable conducting rod 6 moves, the spring 12 can be driven to stretch through the connecting rod 10 and the connecting block 11. The number of the spring holding mechanisms is two, and the two spring holding mechanisms are symmetrically arranged relative to the movable conducting rod 6, in fig. 2, the number of the spring holding mechanisms is two, the two spring holding mechanisms are symmetrically arranged in a bilateral mode relative to the movable conducting rod 6, one end of the cross rod 15 is hinged to the connecting rod 10 of one spring holding mechanism, the other end of the cross rod 15 is hinged to the connecting rod 10 of the other spring holding mechanism, and the connecting rod 10 is obliquely arranged relative to the horizontal portion or the fixed metal plate 5 or the opening coil 7. The spring holding mechanism is used for solving the problem of maintaining the electromagnetic repulsion operation structure in the opening and closing position on the basis of not increasing the opening time, and preventing the moving contact 4 and the static contact 3 from being repelled by the electrodynamic force generated by the current through the moving contact 4 and the static contact 3 and the rebound caused by overlarge impact force at the final stage of opening or closing.
In order to provide a reliable power supply for the energy storage capacitor at the high potential, energy is supplied to the energy storage capacitor charging power supply at the high potential through the isolation power supply, and then the energy storage capacitor is charged by the energy storage capacitor charging power supply. The high-voltage isolation optical fiber transmits a switch-on signal and a switch-off signal to the control unit, and the switch-on and switch-off of a power thyristor of the energy storage capacitor discharge loop are controlled to control the switch-on and switch-off. The control unit is used for completing the functions of voltage and current data acquisition and calculation, opening and closing delay time calculation and control, external input and output interfaces, communication and the like, and specifically, acquiring and finishing voltage and current signals; and detecting the voltage of the energy storage capacitor, if the voltage is insufficient, charging the capacitor, and if an opening and closing command is received and the running state and the position of the equipment are judged to be correct, performing corresponding opening and closing operation. When the opening and closing operation is finished or the action time exceeds the set opening and closing time, immediately stopping the opening and closing operation, and alarming and forbidding the equipment to act under the condition that no operation condition or mechanism fault exists; and after the control command is generated, the energy storage capacitor is controlled to discharge to drive the electromagnetic repulsion operating mechanism to act.
In order to enable the rapid mechanical switch equipment to meet the insulation performance requirements of small opening time, such as less than or equal to 2ms, and large maximum transient overvoltage tolerance, such as 330kV, the conventional single-fracture isolating switch is difficult to realize, so that a plurality of fractures with short strokes are connected in series to improve the opening speed, and the rapid mechanical switch equipment is designed according to modularization. Specifically, the number of the vacuum interrupter 1 is plural, and the plural vacuum interrupters 1 are connected in series in sequence.
When the number of the vacuum arc-extinguishing chambers 1 is multiple, the vacuum arc-extinguishing chamber further comprises a plurality of resistance-capacitance pressure-equalizing devices 14, the resistance-capacitance pressure-equalizing devices 14 are integrally designed in a dry-type oil-free integrated mode, sulfur hexafluoride gas (micro-positive pressure) is filled inside the resistance-capacitance pressure-equalizing devices, the external sleeve pipe is a composite insulator, and each resistance-capacitance pressure-equalizing device is provided with a resistance capacitorVoltage-sharing device 14 all uses with a vacuum interrupter 1 cooperation, and resistance-capacitance voltage-sharing device 14 includes: voltage-sharing capacitor C g Parallel resistor R p And a series resistance R L . Voltage-sharing capacitor C g Is connected with the vacuum arc-extinguishing chamber 1 in parallel; parallel resistor R p Is connected with the vacuum arc extinguish chamber 1 in parallel; series resistance R L And voltage-sharing capacitor C g After being connected in series, the resistor-capacitor voltage-sharing device 14 is connected in parallel with the vacuum arc-extinguishing chamber 1, that is, the resistor-capacitor voltage-sharing device is connected in parallel with the vacuum arc-extinguishing chamber 1. Preferably, a voltage-sharing capacitor C g Has a capacitance value of 8nF to 12nF, preferably 10 nF; parallel resistor R p Has a resistance value of 180 M.OMEGA.to 220 M.OMEGA.and preferably 200 M.OMEGA.; series resistance R L The resistance value of (2) is 80 Ω to 120 Ω, preferably 100 Ω. The configuration of the resistance-capacitance voltage equalizing device 14 cannot cause negative effects of the direct current circuit breaker, and operation boundary conditions of the direct current circuit breaker under different working conditions need to be checked. Firstly, the insulation requirement in the switching process of the direct current breaker is met; secondly, the direct current static voltage-sharing limitation of the mechanical switch equipment is realized; in order to achieve the expected static voltage-sharing effect in the operation of the direct-current circuit breaker, the voltage-sharing capacitor C of the equipment g Parallel resistor R with two ends connected in parallel megaohm to hundred megaohm p So that the static pressure equalizing effect is achieved. Thirdly, limiting the heating power of the resistance-capacitance loop; for the resistor in the resistance-capacitance voltage-sharing loop in the rapid mechanical switch equipment, the maximum power of the resistor should not exceed the rated power limit; fourthly, releasing charge of the rapid reclosing of the direct current breaker; in order to inhibit the influence of the direct discharge process of the capacitor charges on the current of the transfer branch circuit, a voltage-sharing capacitor C is required g A resistor with a moderate capacitance value is connected in series to release the energy stored in the capacitor, limit the magnitude of the impact current and inhibit the oscillating discharge.
Based on the consideration, in order to realize the dynamic voltage-sharing capacity of the device in the breaking process, the design of a voltage-sharing capacitor of a mechanical switch fracture is analyzed and provided by extracting the stray capacitor of a valve tower of the direct-current breaker, and the capacitor C g The capacity value is preferably 10 nF. Due to the consideration that: dynamic voltage-sharing and static voltage-sharing limitation of rapid mechanical switch, temperature rise limitation of resistance-capacitance loop, parallel resistor R design p Is 200M omega. To avoid oscillation of the circuit of the RC voltage equalizer 14And simultaneously restraining the influence of the reclosing discharge process of the capacitor charge on the current of the transfer branch, and designing a series resistor R L A preferred value is 100 omega.
The application also provides a direct current breaker, and it includes the direct current breaker module of a plurality of order series connection, and the direct current breaker module includes: the main loop, the transfer branch and the lightning arrester are connected in parallel. The main circuit is formed by connecting a fast mechanical switching device in a flexible direct current power grid and a first full bridge structure in series. The transfer branch is formed by connecting a plurality of second full-bridge structures in series in sequence. The lightning arrester forms an energy consumption loop. The first full bridge structure may be an IGBT full bridge structure. The second full bridge configuration may be a diode full bridge configuration. Corresponding to the above requirements, the DC breaker module may be a module rated at 40kV DC voltage level, with 5 modules connected in series. The voltage level and the number of the dc short-circuit modules may be redesigned according to actual situations, which is not limited in this embodiment. The quick mechanical switch equipment adopts non-arc breaking, when the system normally operates, the quick isolating switch is connected in series in the main loop, when a fault occurs, the current of the quick isolating switch is transferred to the transfer branch circuit, and the quick isolating switch can be broken when no current exists.
From the above description, it can be seen that the above-mentioned embodiments of the present invention achieve the following technical effects:
the embedded pole 2 is designed outside the vacuum arc-extinguishing chamber, so that the modularized design is realized, the structure is simple, the number of detachable parts is small, and the reliability is high; the insulating property is high, and the influence of the environment on the vacuum arc-extinguishing chamber is reduced; because the traditional quick circuit breaker can be provided with the insulating rod between the movable conducting rod 6 and the movable contact 4 of the electromagnetic repulsion operating mechanism, the mass of the insulating rod is large, and the masses of the moving metal disc 8 and the movable contact 4 exceed the driving capability of the driving mechanism, namely the on-off speed and the on-off distance of the driving mechanism in 2ms, and the large tensile load is close to the limit load of the insulating rod. Meanwhile, the insulating rod is used, so that the rapid isolating switch is difficult to modularize and cannot be directly used in a high-voltage direct-current circuit breaker with a higher voltage level. Therefore, the use of an insulating rod is eliminated in design, the moving contact 4 is directly connected with the driving mechanism, the vacuum arc extinguish chamber and the driving mechanism do not have the first and second electric potentials and are at the high electric potential, although the requirement on the voltage-resistant level of the driving mechanism is improved, the serial connection use of a single switch assembly is realized, and the ultrahigh voltage and ultrahigh voltage rapid cut-off is realized.
The utility model discloses a quick mechanical switch is the core protection equipment of high voltage power electronic equipment, can realize the quick isolation and the bypass of trouble, reaches millimeter level; the rated voltage of the single fracture is 60-110KV, and in order to meet the requirements of opening speed and insulation withstand voltage level, N vacuum circuit breaker modules are connected in series for voltage sharing, wherein 1-2 fracture redundancies are reserved. The solid-sealed polar pole 2, the vacuum arc extinguish chamber 1, the resistance-capacitance voltage equalizing device 14, the electromagnetic repulsion operating mechanism, the hydraulic oil buffer device, the spring holding mechanism and the like are combined and applied to realize millisecond-level cut-off of a circuit. The spring holding mechanism is arranged below the electromagnetic repulsion operating mechanism, no insulating rod is arranged between the moving contact 4 in the fixed seal of the vacuum arc extinguish chamber 1 and the electromagnetic repulsion operating mechanism as well as the moving conducting rod 6, and the electromagnetic repulsion operating mechanism is in a high potential, so that the modularized series connection design of the equipment is realized, and the application of the equipment in the field of ultrahigh voltage and ultrahigh voltage level direct current transmission is realized.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. 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 fast mechanical switching device in a flexible dc power grid, comprising:
the vacuum arc extinguish chamber is provided with a fixed contact and a movable contact;
and the driving mechanism is connected with the moving contact of the vacuum arc extinguish chamber, and can drive the moving contact to leave or contact the fixed contact.
2. Fast mechanical switching device in a flexible direct current network according to claim 1, characterized in that said driving mechanism comprises: the electromagnetic repulsion type operating mechanism is used for controlling the moving of the moving conducting rod.
3. The fast mechanical switch apparatus in a flexible dc power grid according to claim 2, wherein the electromagnetic repulsion actuator comprises: the device comprises a moving metal disc, a fixed metal disc, a coil, an energy storage capacitor and a control unit;
the number of the fixed metal discs is two, the movable conducting rod simultaneously penetrates through the two fixed metal discs which are oppositely arranged, an opening coil and a closing coil are respectively arranged on the two fixed metal discs, and the opening coil and the closing coil are both positioned between the two fixed metal discs;
the control unit is connected with the opening coil, the closing coil and the energy storage capacitor and is used for controlling the energy storage capacitor to supply power to the opening coil and the closing coil;
the moving metal disc is arranged between the opening coil and the closing coil and fixedly connected with the moving conducting rod, and electromagnetic repulsion force generated when the closing coil or the opening coil is electrified can push the moving metal disc to move.
4. A fast mechanical switching device in a flexible dc electrical network according to claim 2, further comprising: and the buffer device is connected with the other end of the movable conducting rod, and can buffer the movable conducting rod when the movable contact leaves the static contact.
5. The fast mechanical switching device in a flexible direct current electrical network according to claim 1, further comprising: the solid-sealed polar pole is wrapped on the outer side of the vacuum arc-extinguishing chamber;
the solid-sealed polar pole is made of epoxy resin.
6. A fast mechanical switching device in a flexible dc electrical network according to claim 3, further comprising: the spring holding mechanism is positioned below the closing coil and connected with the movable conducting rod, and the spring holding mechanism is used for holding the position of the movable conducting rod.
7. A fast mechanical switching device in a flexible dc electrical network according to claim 6, characterized in that the spring retention mechanism comprises: the connecting rod, the connecting block, the spring and the base;
two ends of the connecting rod are respectively hinged with the movable conducting rod and the connecting block, and the spring is arranged between the base and the connecting block;
the telescopic direction of the spring is perpendicular to the moving direction of the movable conducting rod, and when the movable conducting rod moves, the spring can be driven to stretch.
8. The fast mechanical switch device in flexible direct current power grid according to claim 6, wherein the number of the spring holding mechanisms is two, and the two spring holding mechanisms are located on the same side of the electromagnetic repulsion operating mechanism and are symmetrically arranged relative to the movable conducting rod.
9. The fast mechanical switching device in a flexible direct current power grid according to claim 1, further comprising, when the number of the vacuum interrupters is plural: a plurality of resistance-capacitance voltage-sharing devices, every resistance-capacitance voltage-sharing device all with one the vacuum interrupter cooperation is used, resistance-capacitance voltage-sharing device includes: voltage-sharing capacitor C g Parallel resistor R p And a series resistance R L ；
The voltage-sharing capacitor C g Is connected with the vacuum arc extinguish chamber in parallel;
the above-mentionedParallel resistor R p Is connected with the vacuum arc extinguish chamber in parallel;
the series resistor R L And the voltage-sharing capacitor C g And the vacuum arc extinguish chambers are connected in parallel after being connected in series.
10. A direct current circuit breaker, characterized in that it comprises: a plurality of direct current breaker modules that establish ties in proper order, direct current breaker module includes:
a main loop, which is formed by connecting the fast mechanical switching device in the flexible direct current power grid of any one of claims 1 to 9 and the first full-bridge structure in series;
the transfer branch is formed by mutually connecting a plurality of second full-bridge structures in series; and
and the lightning arrester forms an energy consumption loop.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202220780064.8U CN217061898U (en) | 2022-03-30 | 2022-03-30 | Direct current breaker and rapid mechanical switching equipment in flexible direct current power grid thereof |
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| CN202220780064.8U CN217061898U (en) | 2022-03-30 | 2022-03-30 | Direct current breaker and rapid mechanical switching equipment in flexible direct current power grid thereof |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115085166A (en) * | 2022-08-19 | 2022-09-20 | 中国电力科学研究院有限公司 | Fast pole-mounted switch, current transfer method, equipment and medium |
| CN115346830A (en) * | 2022-10-18 | 2022-11-15 | 成都法瑞克电气科技有限公司 | Quick mechanical switch and controllable self-recovery energy dissipation device |
| CN115498756A (en) * | 2022-11-17 | 2022-12-20 | 国网（天津）综合能源服务有限公司 | Dual-power switching device and method for power supply system |
| CN117081019A (en) * | 2023-10-10 | 2023-11-17 | 西安合容开关有限公司 | Quick current limiting device |
| CN117393371A (en) * | 2023-11-21 | 2024-01-12 | 广东电网有限责任公司 | Vacuum arc extinguishing chamber |
-
2022
- 2022-03-30 CN CN202220780064.8U patent/CN217061898U/en active Active
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115085166A (en) * | 2022-08-19 | 2022-09-20 | 中国电力科学研究院有限公司 | Fast pole-mounted switch, current transfer method, equipment and medium |
| CN115346830A (en) * | 2022-10-18 | 2022-11-15 | 成都法瑞克电气科技有限公司 | Quick mechanical switch and controllable self-recovery energy dissipation device |
| CN115498756A (en) * | 2022-11-17 | 2022-12-20 | 国网（天津）综合能源服务有限公司 | Dual-power switching device and method for power supply system |
| CN115498756B (en) * | 2022-11-17 | 2023-02-21 | 国网（天津）综合能源服务有限公司 | Dual-power switching device and method for power supply system |
| CN117081019A (en) * | 2023-10-10 | 2023-11-17 | 西安合容开关有限公司 | Quick current limiting device |
| CN117081019B (en) * | 2023-10-10 | 2024-03-12 | 西安合容开关有限公司 | Quick current limiting device |
| CN117393371A (en) * | 2023-11-21 | 2024-01-12 | 广东电网有限责任公司 | Vacuum arc extinguishing chamber |
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