CN118098866A - Arc-resisting device and method for mechanical switch - Google Patents
Arc-resisting device and method for mechanical switch Download PDFInfo
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- CN118098866A CN118098866A CN202410277780.8A CN202410277780A CN118098866A CN 118098866 A CN118098866 A CN 118098866A CN 202410277780 A CN202410277780 A CN 202410277780A CN 118098866 A CN118098866 A CN 118098866A
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- thyristor
- circuit breaker
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- 238000000034 method Methods 0.000 title claims abstract description 48
- 238000010304 firing Methods 0.000 claims description 4
- 239000004020 conductor Substances 0.000 claims 1
- 238000002679 ablation Methods 0.000 abstract description 5
- 230000002035 prolonged effect Effects 0.000 abstract 1
- 238000010891 electric arc Methods 0.000 description 3
- 229910018487 Ni—Cr Inorganic materials 0.000 description 2
- VNNRSPGTAMTISX-UHFFFAOYSA-N chromium nickel Chemical group [Cr].[Ni] VNNRSPGTAMTISX-UHFFFAOYSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Classifications
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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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
- H01H9/54—Circuit arrangements not adapted to a particular application of the switching device and for which no provision exists elsewhere
- H01H9/541—Contacts shunted by semiconductor devices
- H01H9/542—Contacts shunted by static switch means
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
- H01H9/54—Circuit arrangements not adapted to a particular application of the switching device and for which no provision exists elsewhere
- H01H9/547—Combinations of mechanical switches and static switches, the latter being controlled by the former
Landscapes
- Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
Abstract
The invention discloses a mechanical switch arc-pulling device and a method, wherein the device comprises the following components: the three-phase circuit breaker and thyristor branches connected in parallel at two ends of the three-phase circuit breaker, wherein the three-phase circuit breaker is used for controlling the on or off of a current loop; and the thyristor branch is used for preventing the three-phase circuit breaker from forming overvoltage arcing in the disconnection process so as to protect the three-phase circuit breaker. According to the invention, the thyristor branches are connected in parallel at two ends of the three-phase circuit breaker and the driving signals of the thyristor branches are reasonably and effectively controlled, so that the generation of arcing phenomenon can be avoided, the three-phase circuit breaker is protected, and the service life of equipment is further prolonged; the problem of mechanical switch often contact ablation in the application and life-span is short is solved.
Description
Technical Field
The invention relates to the field of high-power distribution. And more particularly to an arc-resistant device and method for a mechanical switch.
Background
The circuit breaker ablation phenomenon often occurs in the radar power supply and distribution system, so that the circuit breaker is often damaged, and a loop cannot work normally. Based on this, for thousands of amperes of loops, it is necessary to further protect and design the high current mechanical switch against arcing.
Disclosure of Invention
The invention provides an arc-resisting device and an arc-resisting method for a mechanical switch, which are used for solving at least one of the problems existing in the prior art.
In order to achieve the above purpose, the invention adopts the following technical scheme:
a first aspect of the present invention provides a mechanical switch arc protection device, the device comprising: a three-phase breaker and thyristor branches connected in parallel at two ends of the three-phase breaker, wherein,
The three-phase circuit breaker is used for controlling the on or off of the current loop;
and the thyristor branch is used for preventing the three-phase circuit breaker from forming overvoltage arcing in the disconnection process so as to protect the three-phase circuit breaker.
Optionally, the device further comprises a thyristor drive circuit board,
The thyristor circuit drive board receives a control signal provided by an external controller and provides an opening signal to the thyristor branch in response to the control signal.
Optionally, the external controller is further configured to provide a conduction signal or a trip signal to the circuit breaker.
Optionally, the thyristor branch circuit includes a first thyristor, a second thyristor, and a resistor, the anode of the first thyristor, the cathode of the second thyristor, and the first end of the three-phase circuit breaker are coupled to a first node, the cathode of the first thyristor, the anode of the second thyristor, and the first end of the resistor are coupled to a second node, and the second end of the resistor and the second end of the three-phase circuit breaker are coupled to a third node.
Optionally, the resistor is used for preventing the thyristor from being damaged by overload current generated by short circuit of the loop.
Optionally, the current loop is a three-phase current loop, and the device comprises a three-phase circuit breaker disposed in three wires of the three-phase current loop.
A second aspect of the present invention provides a method based on the mechanical switch arc-protection device, the method comprising:
The external controller is used for controlling the opening of the thyristor branch and controlling the on or off of the three-phase breaker;
In the process of breaking the three-phase circuit breaker, the thyristor branch is conducted to prevent the three-phase circuit breaker from forming overvoltage arcing in the process of breaking, so as to protect the three-phase circuit breaker.
Optionally, the controlling the on or off of the three-phase circuit breaker in response to the external controller includes
Providing a conduction signal to the three-phase circuit breaker through an external controller, and controlling the conduction of the three-phase circuit breaker;
And providing a tripping signal to the three-phase circuit breaker through an external controller, and controlling the opening of the three-phase circuit breaker.
Optionally, the providing, by an external controller, a trip signal to the three-phase circuit breaker includes
And if the current passing through the three-phase circuit breaker exceeds the preset current, sending a tripping signal to the three-phase circuit breaker through an external controller.
Optionally, controlling the firing of the thyristor in response to the firing signal provided by the thyristor drive circuit board comprises
And sending a control signal to a thyristor drive circuit board through an external controller, wherein the thyristor drive circuit board responds to the control signal and provides a starting signal for the thyristor branch.
The beneficial effects of the invention are as follows:
The invention adopts the method of connecting the thyristor branches in parallel at the two ends of the three-phase breaker and reasonably and effectively controlling the starting signals of the thyristor branches, thereby avoiding the generation of arcing phenomenon of the three-phase breaker, protecting the breaker, further protecting the service life of equipment and solving the problems of frequent contact ablation and short service life of the mechanical switch in application.
Drawings
The following describes the embodiments of the present invention in further detail with reference to the drawings.
Fig. 1 shows a schematic diagram of the arc-pulling device of the mechanical switch of the present invention.
Detailed Description
In order to more clearly illustrate the present invention, the present invention will be further described with reference to preferred embodiments and the accompanying drawings. Like parts in the drawings are denoted by the same reference numerals. It is to be understood by persons skilled in the art that the following detailed description is illustrative and not restrictive, and that this invention is not limited to the details given herein.
The invention provides a mechanical switch arc-pulling-resisting device and a method, which can prevent a breaker from forming arc-pulling ablation contacts in the switching process in a large loop of thousands of amperes, thereby improving the safety of equipment and improving the reliability of power supply of a system.
A first aspect of the present invention provides a mechanical switch arc protection device, the device comprising: the thyristor circuit driving board, the three-phase breaker and the thyristor branches connected in parallel at two ends of the three-phase breaker, wherein,
The thyristor circuit driving board receives a control signal sent by an external controller, responds to the control signal and provides a continuous starting signal for the thyristor branch, and after receiving the starting signal, the thyristor branch connected in parallel at two ends of the three-phase circuit breaker is simultaneously started;
The three-phase circuit breaker is used for receiving a conduction signal or a tripping signal sent by the external controller to control the conduction or disconnection of the current loop;
after the thyristor branch is started, an external controller provides a conduction signal for the three-phase circuit breaker to control the conduction of the circuit breaker;
The thyristor branches are connected in parallel at two ends of the three-phase circuit breaker and are used for forming overvoltage arcing in the tripping process of the circuit breaker so as to protect the three-phase circuit breaker;
The thyristor branch is connected with the resistor in series and is used for preventing the thyristor from being damaged by overload current generated by circuit short circuit;
After the three-phase circuit breaker is conducted, the loop normally operates. In the loop running process, if the current passing through the three-phase circuit breaker exceeds the preset current, namely the current passing through the three-phase circuit breaker is larger than 1.5 times of the maximum current born by the three-phase circuit breaker, a tripping signal is sent to the three-phase circuit breaker through an external controller, and the three-phase circuit breaker is controlled to be disconnected; and in the period that the external controller sends the tripping signal for 100ms, the three-phase circuit breaker receives the tripping signal and realizes the disconnection of the circuit breaker, and in the tripping process of the three-phase circuit breaker, small voltage is generated at two ends of the thyristor branch, and the generated voltage drop makes the thyristor branch conduct and is insufficient for forming arc discharge. After 100ms, the external controller does not provide a control signal to the thyristor drive circuit board any more, namely the thyristor drive circuit board does not provide a continuous starting signal to the thyristor branch, and the thyristor branch is turned off, so that the accident is prevented from being further enlarged.
In a specific embodiment, a three-phase circuit is preferred, i.e. a three-phase breaker is provided, with 3 thyristor branches connected in parallel across the three-phase breaker.
Connecting the circuits according to the steps shown in fig. 1, and connecting the connected circuits into a system loop, wherein an external controller is not shown in fig. 1, providing a control signal to a thyristor driving circuit board 5 through the external controller, providing continuous starting signals to 3 thyristor branches after the thyristor driving circuit board 5 receives the control signal, and simultaneously starting the 3 thyristor branches, wherein the starting signal is 5-24V; and then an external controller provides a conduction signal for the three-phase circuit breaker S1, and after the three-phase circuit breaker S1 is conducted, the loop normally operates. During normal operation of the circuit, the conduction voltage drop of the three-phase circuit breaker S1 is insufficient to maintain conduction of the 3 thyristor branches, so that the 3 thyristor branches have little loss during normal operation of the whole conduction circuit, and can be regarded as no loss. In the loop operation process, if an emergency situation occurs and the current passing through the three-phase breaker S1 exceeds the preset current, namely if the current passing through the three-phase breaker S1 is 1.5 times greater than the rated current of the breaker, the external controller is required to provide a tripping signal for the three-phase breaker S1, the three-phase breaker S1 trips immediately, in the three-phase breaker tripping process, the thyristor driving circuit board is always in a working state, 3 thyristor branches are always in a waiting working state, in the three-phase breaker S1 receiving and tripping signal breaking process, the current of the 3 thyristor branches is instantaneously increased, the resistance is increased, the voltage drop at two ends of the thyristor branches is greater than the conduction voltage drop of the thyristor, so that the thyristor is conducted, the three-phase breaker S1 is prevented from forming an overvoltage arc-pulling in the tripping process, after the external controller provides a tripping signal for the three-phase breaker S1, the external controller stops providing a control signal for the thyristor driving circuit board 5, and then the thyristor driving circuit board 5 stops providing a continuous starting signal for the thyristor, and the 3 thyristor branches are automatically turned off, so that the accident is further avoided. Wherein the three-phase circuit breaker S1 receives the trip signal and the time to complete the tripping of the three-phase circuit breaker S1 is within 100 ms.
The thyristor branch circuit comprises a resistor and a thyristor, wherein the resistor is used for preventing the circuit output from being seriously short-circuited, and the thyristor is damaged by excessive current, so that the thyristor is protected. Among them, the resistor is preferably nickel-chromium wire, and its resistance value is selected according to specific loop.
Specifically, the first thyristor branch 2 includes a first resistor R1, a first thyristor Q1, and a second thyristor Q2, where the first resistor R1 is used to prevent an overload current generated by a circuit short from damaging the first thyristor Q1 and the second thyristor Q2;
The second thyristor branch 3 comprises a second resistor R2, a third thyristor Q3 and a fourth thyristor Q4, wherein the second resistor R2 is used for preventing overload current generated by circuit short circuit from damaging the third thyristor Q3 and the fourth thyristor Q4;
The third thyristor branch 4 comprises a third resistor R3, a fifth thyristor Q5 and a sixth thyristor Q6, and the third resistor R3 is used for preventing the fifth thyristor Q5 and the sixth thyristor Q6 from being damaged by overload current generated by short circuit of the circuit.
The first thyristor branch circuit comprises a first thyristor Q1, a second thyristor Q2 and a first resistor R1, wherein the anode of the first thyristor Q1, the cathode of the second thyristor Q2 and the first end of the first branch circuit of the three-phase circuit breaker are coupled to a first node, the cathode of the first thyristor Q1, the anode of the second thyristor Q2 and the first end of the first resistor R1 are coupled to a second node, and the second end of the first resistor R1 and the second end of the first branch circuit of the three-phase circuit breaker are coupled to a third node.
The second thyristor branch circuit comprises a third thyristor Q3, a fourth thyristor Q4 and a second resistor R2, wherein the anode of the third thyristor Q3, the cathode of the fourth thyristor Q4 and the first end of the second branch circuit of the three-phase circuit breaker are coupled to a fourth node, the cathode of the third thyristor Q3, the anode of the fourth thyristor Q4 and the first end of the second resistor R2 are coupled to a fifth node, and the second end of the second resistor R2 and the second end of the second branch circuit of the three-phase circuit breaker are coupled to a sixth node.
The third thyristor branch circuit comprises a fifth thyristor Q5, a sixth thyristor Q6 and a third resistor R3, wherein the anode of the fifth thyristor Q5, the cathode of the sixth thyristor Q6 and the first end of the third branch circuit of the three-phase circuit breaker are coupled to a seventh node, the cathode of the fifth thyristor Q5, the anode of the sixth thyristor Q6 and the first end of the third resistor R3 are coupled to an eighth node, and the second end of the third resistor R3 and the second end of the third branch circuit of the three-phase circuit breaker are coupled to a ninth node.
The connection relation of the schematic diagram of the arc-resisting device of the mechanical switch is as follows: the three-phase circuit breaker S1 sequentially comprises a three-phase circuit breaker first branch, a three-phase circuit breaker second branch and a three-phase circuit breaker third branch from bottom to top, wherein the first thyristor branch 2 is connected with the three-phase circuit breaker first branch in parallel, the second thyristor branch 3 is connected with the three-phase circuit breaker second branch in parallel, and the third thyristor branch 4 is connected with the three-phase circuit breaker third branch in parallel.
The first end of a first branch of the three-phase circuit breaker is connected with the anode of the first thyristor Q1, the cathode of the first thyristor Q1 is connected with the anode of the second thyristor Q2, the anode of the second thyristor Q2 is also connected with the first end of the first resistor R1, the anode of the third thyristor Q2 is also connected with the first end of the first resistor R1, and the second end of the first branch of the three-phase circuit breaker is connected with the second end of the first resistor R1; the grid of the first thyristor Q1 is connected with the thyristor drive circuit board 5, and the grid of the second thyristor Q2 is connected with the thyristor drive circuit board 5.
The third thyristor Q3 is connected with the fourth thyristor Q4 in parallel, the first end of the second branch of the three-phase breaker is connected with the anode of the third thyristor Q3 and is also connected with the cathode of the fourth thyristor Q4, the cathode of the third thyristor Q3 is connected with the anode of the fourth thyristor Q4 and is also connected with the first end of the second resistor R2, the anode of the fourth thyristor Q4 is also connected with the first end of the second resistor R2, and the second end of the second branch of the three-phase breaker is connected with the second end of the second resistor R2; the gate of the third thyristor Q3 is connected to the thyristor drive circuit board 5, and the gate of the fourth thyristor Q4 is connected to the thyristor drive circuit board 5.
The fifth thyristor Q5 is connected with the sixth thyristor Q6 in parallel, the first end of the third branch of the three-phase breaker is connected with the anode of the fifth thyristor Q5 and is also connected with the cathode of the sixth thyristor Q6, the cathode of the fifth thyristor Q5 is connected with the anode of the sixth thyristor Q6 and is also connected with the first end of the third resistor R3, the anode of the sixth thyristor Q6 is also connected with the first end of the third resistor R3, and the second end of the third branch of the three-phase breaker is connected with the second end of the third resistor R3; the gate of the fifth thyristor Q5 is connected to the thyristor drive circuit board 5, and the gate of the sixth thyristor Q6 is connected to the thyristor drive circuit board 5.
A second aspect of the present invention provides a method for a mechanical switch based arc protection device, the method comprising:
The external controller is used for controlling the opening of the thyristor branch and controlling the on or off of the three-phase breaker;
The external controller sends a control signal to the thyristor drive circuit board, and the thyristor drive circuit board receives the control signal and sends a continuous starting signal to the thyristor branch, wherein the starting signal is 5-24V;
After the thyristor branch is started, a conduction signal is provided for the three-phase breaker through an external controller, the three-phase breaker is conducted, the loop works normally, and the conduction voltage drop of the three-phase breaker is smaller than the conduction voltage drop of the thyristor during the normal working period of the loop, so that the thyristor is not enough to maintain the conduction of the thyristor, and therefore, the thyristor basically has no loss in the whole conduction loop;
in the loop running process, if the current passing through the three-phase circuit breaker is overlarge due to emergency, and exceeds the rated current of the three-phase circuit breaker, a tripping signal is sent to the three-phase circuit breaker through an external controller, and the three-phase circuit breaker is disconnected;
If the external controller controls the three-phase breaker to be disconnected, the thyristor branch is conducted in the disconnection process of the three-phase breaker so as to prevent the three-phase breaker from forming overvoltage arcing in the disconnection process, and the three-phase breaker is protected.
In the process of disconnecting the three-phase circuit breaker, the thyristor drive circuit board is always in operation, and a continuous starting signal is provided for the thyristor branch, and as the conducting voltage drop of the three-phase circuit breaker is smaller than the conducting voltage drop of the thyristor, the thyristor branch is in a to-be-operated state, and at the moment of disconnecting the three-phase circuit breaker, the voltage drop of the two ends of the thyristor branch is larger than the conducting voltage drop of the thyristor, so that the thyristor is conducted, and the three-phase circuit breaker is prevented from forming overvoltage arcing in the disconnection process, so that the three-phase circuit breaker is protected;
The resistor is connected in series with the thyristor branch, so that the serious short circuit of loop output is prevented, the thyristor is damaged by excessive current, and the effect of protecting the thyristor is achieved. Among them, the resistor is preferably nickel-chromium wire, and its resistance value is selected according to specific loop.
In a specific embodiment, the thyristor drive circuit board 5, the thyristor branch circuit and the circuit breaker S1 are sequentially connected according to the steps shown in fig. 1, and are connected into a loop, so that the thyristor drive circuit board 5, the thyristor branch circuit and the circuit breaker S1 are sequentially driven; the external controller is used for providing control signals for the thyristor drive circuit board 5, after the thyristor drive circuit board 5 receives the control signals, continuous starting signals are provided for 3 thyristor branches, after the 3 thyristor branches are started, the external controller is used for providing conduction signals for the three-phase circuit breaker S1, the three-phase circuit breaker S1 is used for conducting a loop after receiving the conduction signals, and the whole loop normally operates. At this time, the conduction voltage drop of the three-phase circuit breaker S1 is smaller than that of the thyristor branch, i.e., the thyristor branch has no loss in the whole conduction loop. In the loop running process, if an emergency situation occurs and the external controller detects that the current passing through the three-phase breaker S1 is 1.5 times greater than the rated current of the three-phase breaker S1, the three-phase breaker S1 is required to trip; the external controller sends a tripping signal to the three-phase breaker S1, in the process, the thyristor driving circuit board 5 is always in a working state, namely 3 thyristor branches always receive continuous starting signals, in the process of tripping the three-phase breaker S1, the voltage drop of the thyristor branches is larger than the conduction voltage drop of the thyristors, the thyristors are conducted, the three-phase breaker S1 is prevented from forming overvoltage arc discharge in the tripping process, after the tripping signal of the three-phase breaker S1 is given for 100ms, the three-phase breaker S1 receives the tripping signal and finishes tripping, so that a loop is disconnected, after 100ms, the external controller stops providing control signals for the thyristor driving circuit board 5, the thyristor driving circuit board 5 stops providing continuous starting signals for the thyristor branches, and the thyristor branches are turned off, so that accidents are prevented from being further expanded.
Specifically, the three-phase circuit breaker S1 sequentially comprises a first three-phase circuit breaker branch, a second three-phase circuit breaker branch and a third three-phase circuit breaker branch from bottom to top, two ends of the first three-phase circuit breaker branch are connected in parallel with a first thyristor branch 2, the first thyristor branch 2 comprises a first resistor R1, a first thyristor Q1 and a second thyristor Q2, and the first resistor R1 is used for preventing an overload current generated by circuit short circuit from damaging the first thyristor Q1 and the second thyristor Q2;
The two ends of the second branch of the three-phase circuit breaker are connected with a second thyristor branch 3 in parallel, the second thyristor branch 3 comprises a second resistor R2, a third thyristor Q3 and a fourth thyristor Q4, and the second resistor R2 is used for preventing overload current generated by circuit short circuit from damaging the third thyristor Q3 and the fourth thyristor Q4;
The third thyristor branch 4 is connected in parallel with the two ends of the third branch of the three-phase circuit breaker, and the third thyristor branch 4 comprises a third resistor R3, a fifth thyristor Q5 and a sixth thyristor Q6, wherein the third resistor R3 is used for preventing overload current generated by circuit short circuit from damaging the fifth thyristor Q5 and the sixth thyristor Q6.
The method provided by the invention is also suitable for the single-phase power supply condition.
The invention adopts the method that the two ends of the three-phase breaker are connected with the thyristor branch circuits in parallel, is applied to a high-current loop with thousands of amperes, can protect the three-phase breaker from arc discharge and contact ablation in the process of switching on and off, increases the safety of equipment, protects the service life of the equipment, and improves the reliability of power supply of a system.
In the description of the present invention, it should be noted that the azimuth or positional relationship indicated by the terms "upper", "lower", etc. are based on the azimuth or positional relationship shown in the drawings, and are merely for convenience of describing the present invention and simplifying the description, and are not indicative or implying that the apparatus or element in question must have a specific azimuth, be constructed and operated in a specific azimuth, and thus should not be construed as limiting the present invention. Unless specifically stated or limited otherwise, the terms "mounted," "connected," and "coupled" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
It is further noted that in the description of the present invention, relational terms such as first and second, and the like 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. Moreover, the terms "comprises," "comprising," or any other variation thereof, 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 phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
It should be understood that the foregoing examples of the present invention are provided merely for clearly illustrating the present invention and are not intended to limit the embodiments of the present invention, and that various other changes and modifications may be made therein by one skilled in the art without departing from the spirit and scope of the present invention as defined by the appended claims.
Claims (10)
1. A mechanical switch arc-pull resistant device, the device comprising:
a three-phase breaker and thyristor branches connected in parallel at two ends of the three-phase breaker, wherein,
The three-phase circuit breaker is used for controlling the on or off of the current loop;
and the thyristor branch is used for preventing the three-phase circuit breaker from forming overvoltage arcing in the disconnection process so as to protect the three-phase circuit breaker.
2. The apparatus of claim 1, further comprising a thyristor drive circuit board,
The thyristor circuit drive board receives a control signal provided by an external controller and provides an opening signal to the thyristor branch in response to the control signal.
3. The apparatus of claim 2, wherein the external controller is further configured to provide a turn-on signal or a trip signal to a three-phase circuit breaker.
4. The apparatus of claim 1, wherein the thyristor branch comprises a first thyristor, a second thyristor, and a resistor, wherein an anode of the first thyristor, a cathode of the second thyristor, and a first end of the three-phase circuit breaker are coupled to a first node, wherein a cathode of the first thyristor, an anode of the second thyristor, and a first end of the resistor are coupled to a second node, and wherein a second end of the resistor and a second end of the three-phase circuit breaker are coupled to a third node.
5. The apparatus of claim 4, wherein the resistor is configured to prevent an overload current generated by a short circuit of the circuit from damaging the thyristor.
6. The apparatus of claim 1, wherein the current loop is a three-phase current loop, the apparatus comprising a three-phase circuit breaker disposed in three conductors of the three-phase current loop.
7. A method based on the mechanical switch arc protection device of any one of claims 1-6, comprising
The external controller is used for controlling the opening of the thyristor branch and controlling the on or off of the three-phase breaker;
In the process of breaking the three-phase circuit breaker, the thyristor branch is conducted to prevent the three-phase circuit breaker from forming overvoltage arcing in the process of breaking, so as to protect the three-phase circuit breaker.
8. The method of claim 7, wherein controlling the opening or closing of the three-phase circuit breaker in response to the external controller comprises
Providing a conduction signal to the three-phase circuit breaker through an external controller, and controlling the conduction of the three-phase circuit breaker;
And providing a tripping signal to the three-phase circuit breaker through an external controller, and controlling the opening of the three-phase circuit breaker.
9. The method of claim 8, wherein the providing, by an external controller, a trip signal to the three-phase circuit breaker comprises
And if the current passing through the three-phase circuit breaker exceeds the preset current, sending a tripping signal to the three-phase circuit breaker through an external controller.
10. The method of claim 7, wherein controlling the firing of the thyristor in response to the firing signal provided by the thyristor drive circuit board comprises
And sending a control signal to a thyristor drive circuit board through an external controller, wherein the thyristor drive circuit board responds to the control signal and provides a starting signal for the thyristor branch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410277780.8A CN118098866A (en) | 2024-03-12 | 2024-03-12 | Arc-resisting device and method for mechanical switch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410277780.8A CN118098866A (en) | 2024-03-12 | 2024-03-12 | Arc-resisting device and method for mechanical switch |
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|---|---|
| CN118098866A true CN118098866A (en) | 2024-05-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202410277780.8A Pending CN118098866A (en) | 2024-03-12 | 2024-03-12 | Arc-resisting device and method for mechanical switch |
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| Country | Link |
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| CN (1) | CN118098866A (en) |
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2024
- 2024-03-12 CN CN202410277780.8A patent/CN118098866A/en active Pending
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