CN217522571U - Direct current breaker - Google Patents
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- CN217522571U CN217522571U CN202221310479.5U CN202221310479U CN217522571U CN 217522571 U CN217522571 U CN 217522571U CN 202221310479 U CN202221310479 U CN 202221310479U CN 217522571 U CN217522571 U CN 217522571U
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Abstract
The utility model belongs to the circuit breaker field, concretely relates to direct current breaker, direct current breaker includes mainstream branch road, controller and change of current branch road, the mainstream branch road is used for connecting the power consumption system, the controller with the mainstream branch road is connected, can control when the power consumption system trouble the disconnection of mainstream branch road the system current that the power consumption system provided, change of current branch road with the mainstream branch road is parallelly connected, change of current branch road with the controller is connected, the change of current branch road can under the control of controller the disconnection of mainstream branch road produces reverse current during system current, reverse current with system current opposite direction. In the application, when the system current is increased suddenly when a power utilization system fails, the controller controls the current conversion branch circuit to generate reverse current, and the system current and the reverse current can be superposed to enable the system current of the main flow branch circuit to pass through the zero crossing point, so that the non-arc switching-on and switching-off are completed, and the service life of the direct current circuit breaker is prolonged.
Description
Technical Field
This application belongs to the circuit breaker field, concretely relates to direct current circuit breaker.
Background
The direct current circuit breaker is used as main protection of a traction power supply system protection unit and is a key device for overall protection of the traction power supply system. At present, a direct current breaker commonly adopted by a traction power supply system is an air direct current breaker, the air type direct current breaker needs to be subjected to arc extinction by a metal grid plate and energy absorption by a metal oxide arrester (namely MOV) in the turn-off process, the arcing time is long, the influence on an arc extinction chamber is large, the metal oxide arrester is easy to damage when bearing overvoltage for multiple times, the reliability of the direct current breaker is reduced, and the service life of the direct current breaker is shortened.
SUMMERY OF THE UTILITY MODEL
An object of this application is to provide a direct current breaker to improve direct current breaker's quick breaking capacity, improve direct current breaker's reliability, prolong direct current breaker's life.
In order to achieve the above object, the present application provides a direct current circuit breaker including:
the main flow branch is used for connecting an electric system;
the controller is connected with the main flow branch and can control the main flow branch to disconnect the system current provided by the power utilization system when the power utilization system fails;
the current conversion branch is connected with the controller in parallel, and can generate reverse current under the control of the controller when the main flow branch cuts off the system current, wherein the reverse current is opposite to the system current.
Optionally, the dc circuit breaker further includes an energy consumption branch, where the energy consumption branch is connected in parallel with the commutation branch, and the energy consumption branch can consume energy of the commutation branch under the control of the controller.
Optionally, the commutation branch includes an inductor, a thyristor unit, and a capacitor connected in series, where the thyristor unit has a first state and a second state, where in the first state, the capacitor discharges to generate the reverse current to pass through the thyristor unit, and in the second state, the system current passes through the thyristor unit;
the energy consumption branch is connected with the capacitor in parallel.
Optionally, the thyristor unit includes a first thyristor and a second thyristor connected in parallel in an inverse manner, in the first state, the first thyristor is turned on and the second thyristor is turned off, and in the second state, the second thyristor is turned on and the first thyristor is turned off.
Optionally, the energy consumption branch includes an energy consumption resistor and a control switch connected in series.
Optionally, the control switch comprises an integrated gate commutated thyristor.
Optionally, the dc circuit breaker further includes a comparison branch, the comparison branch is connected in parallel with the capacitor, the comparison branch is used for detecting voltages at two ends of the capacitor, and the comparison branch and the control switch are both connected to the controller;
when the comparison branch detects that the voltage at two ends of the capacitor is greater than a first preset value, the controller controls the control switch to be conducted;
when the comparison branch detects that the voltage at the two ends of the capacitor is smaller than a second preset value, the controller controls the control switch to be switched off, and the second preset value is smaller than the first preset value.
Optionally, the main flow passage branch includes a vacuum switch, and the controller is connected to the vacuum switch.
Optionally, the dc circuit breaker further includes a testing branch, the testing branch is connected in parallel with the main flow path branch, the testing branch is connected to the controller, the testing branch can detect the fault of the power consumption system, and the controller controls the main flow path branch to be conducted after the testing branch detects the fault elimination of the power consumption system.
Optionally, the test branch includes a test contactor, a test resistor, and a first current detection element connected in series.
The application discloses direct current breaker has following beneficial effect:
in the application, the change of current branch road and mainstream through branch road are parallelly connected, when the system current surge appears in the power consumption system trouble, the controller control mainstream through branch road disconnection system current, control change of current branch road simultaneously and produce reverse current, reverse current and system current opposite direction, system current and reverse current can superpose and make mainstream through branch road system current zero crossing, thereby realize no arc and cut off, the life-span of extension direct current circuit breaker, adopt high-power semiconductor device, combine power electronics overvoltage logic comparison branch road and overvoltage control branch road, the control of effectual realization overvoltage.
Other features and advantages of the present application will be apparent from the following detailed description, or may be learned by practice of the application.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and together with the description, serve to explain the principles of the application. It is obvious that the drawings in the following description are only some embodiments of the application, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.
Fig. 1 is a schematic diagram of connection of branches of a dc circuit breaker according to an embodiment of the present application;
fig. 2 is a schematic structural diagram of a dc circuit breaker in an embodiment of the present application.
Description of reference numerals:
100. a main flow passage branch; 110. a second current detection element; 120. a vacuum switch;
200. a current conversion branch circuit; 210. an inductance; 220. a thyristor unit; 221. a first thyristor; 222. a second thyristor; 230. a capacitor;
300. a controller;
400. an energy consumption branch circuit; 410. a power consumption resistor; 420. a control switch;
500. testing the branch circuit; 510. testing the contactor; 520. testing the resistance; 530. a first current detection element;
600. an isolating switch;
11. a positive bus; 12 negative bus bar.
Detailed Description
Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art.
Furthermore, the described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to give a thorough understanding of embodiments of the application. One skilled in the relevant art will recognize, however, that the subject matter of the present application can be practiced without one or more of the specific details, or with other methods, components, devices, steps, and so forth. In other instances, well-known methods, devices, implementations, or operations have not been shown or described in detail to avoid obscuring aspects of the application.
The present application will be described in further detail with reference to the following drawings and specific examples. It should be noted that the technical features mentioned in the embodiments of the present application described below may be combined with each other as long as they do not conflict with each other. The embodiments described below with reference to the accompanying drawings are illustrative and intended to explain the present application and should not be construed as limiting the present application.
Fig. 1 is a schematic diagram illustrating connection of branches of a dc circuit breaker in an embodiment of the present application, and fig. 2 is a schematic diagram illustrating a schematic structure of a dc circuit breaker in an embodiment of the present application, and referring to fig. 1 and fig. 2, the dc circuit breaker includes: a main flow branch 100, a commutation branch 200 and a controller 300. The main flow branch 100 is used for connecting an electric system, when the dc circuit breaker normally works, a system current of the electric system can pass through the main flow branch 100, and after the electric system fails, the controller 300 can control the main flow branch 100 to disconnect the system current of the electric system. The commutation branch 200 is connected in parallel with the main flow branch 100, the commutation branch 200 is connected with the controller 300, and the commutation branch 200 can generate reverse current when the main flow branch 100 disconnects the system current under the control of the controller 300, wherein the reverse current is opposite to the system current. The system current and the reverse current are superposed, so that the system current of the main flow branch 100 is suddenly increased at the time of fault and passes through the zero point.
In the application, the current conversion branch 200 is connected with the main flow-through branch 100 in parallel, when the system current is increased rapidly when the power system fails, the controller 300 controls the main flow-through branch 100 to cut off the system current, and controls the current conversion branch 200 to generate reverse current, the reverse current is opposite to the system current, the system current and the reverse current can be superposed to enable the system current of the main flow-through branch 100 to pass through the zero point, the arc-free cut-off is realized, and the service life of the direct current circuit breaker is prolonged.
Referring to fig. 1 and 2, the dc circuit breaker further includes an energy consumption branch 400, the energy consumption branch 400 is connected in parallel with the commutation branch 200, and the energy consumption branch 400 can consume energy of the commutation branch 200 under the control of the controller 300.
It should be noted that, when the energy consumption branch 400 is connected in parallel with the commutation branch 200, the energy consumption branch 400 may be connected in parallel with the whole commutation branch 200, or may be connected in parallel with some components in the commutation branch 200, which may be determined according to the circumstances.
The main flow branch 100 is disconnected, the current conversion branch 200 generates a reverse current, so that the system current of the main flow branch 100 crosses the zero point, the current of the main flow branch 100 is transferred to the current conversion branch 200, and the energy consumption branch 400 is connected with the current conversion branch 200 in parallel, so that the residual energy on the current conversion branch 200 can be consumed, and the direct current circuit breaker is protected.
Referring to fig. 1 and 2, the main flow branch 100 may include a second current sensing element 110 and a vacuum switch 120, the second current sensing element 110 being used to sense a current on the main flow branch 100, and the vacuum switch 120 being used to disconnect the main flow branch 100.
It should be noted that the main flow branch 100 may include a vacuum switch 120, but is not limited thereto, and other types of switches may be used for the main flow branch 100, as appropriate. The second current detecting element 110 may include a current sensor, but is not limited thereto, and the second current detecting element 110 may also include an ammeter, as the case may be.
The vacuum switch 120 can rapidly cut off the system current when the power utilization system fails, and simultaneously the current converting branch circuit 200 generates reverse current, and the system current and the reverse current are superposed to rapidly extinguish the electric arc of the vacuum arc extinguishing chamber of the vacuum switch 120, so that the vacuum switch 120 is protected, the service life of the vacuum switch 120 is prolonged, and the service life of the direct current breaker is also prolonged.
Referring to fig. 1 and 2, the commutation branch 200 includes an inductor 210, a thyristor cell 220 and a capacitor 230 in series. The thyristor cell 220 has a first state in which the capacitor 230 discharges to generate a reverse current through the thyristor cell 220, and a second state in which a system current passes through the thyristor cell 220. The energy consumption branch 400 is connected in parallel with the capacitor 230, that is, the energy consumption branch 400 is connected in parallel with some components in the commutation branch 200.
It should be noted that the commutation branch 200 may include a thyristor unit 220, but is not limited thereto, the thyristor unit 220 is used to control the direction of the current, and the commutation branch 200 may also control the direction of the current through other switch circuits, as the case may be.
After the main flow branch 100 disconnects the system current, the controller 300 controls the thyristor unit 220 to be in the first state, the capacitor 230 is the pre-charging capacitor 230, the pre-charging capacitor 230 discharges to generate a reverse current, the reverse current is a reverse resonance current, and the reverse resonance current is superposed with the system current, so that the current of the main flow branch 100 crosses the zero point, and the arc of the vacuum arc-extinguishing chamber of the vacuum switch 120 is rapidly extinguished at the current crossing point;
after the arc of the vacuum arc-extinguishing chamber of the vacuum switch 120 is extinguished, the system current is transferred to the commutation branch 200, the controller 300 controls the thyristor unit 220 to be in the second state again, the capacitor 230 is charged, and the energy is consumed through the energy consumption branch 400 connected in parallel with the capacitor 230.
The capacitor 230 and the inductor 210 can be used as energy storage elements to store energy, the capacitor 230 is a pre-charging capacitor 230, after the main flowing branch 100 disconnects the system current, the pre-charging capacitor 230 discharges to generate reverse current, electric arcs of a vacuum arc extinguish chamber of the vacuum switch 120 are rapidly extinguished, the service life of the vacuum switch 120 is prolonged, after the current of the main flowing branch 100 crosses zero, the system current is transferred to the commutation branch 200 to charge the capacitor 230, the energy consumption branch 400 consumes redundant electric energy of the capacitor 230, the capacitor 230 can be prevented from being damaged, and the service life of the direct current circuit breaker is prolonged.
Referring to fig. 1 and 2, the thyristor unit 220 includes a first thyristor 221 and a second thyristor 222 connected in inverse parallel, and in a first state, the controller 300 controls the first thyristor 221 to be turned on and the second thyristor 222 to be turned off, and in a second state, the controller 300 controls the second thyristor 222 to be turned on and the first thyristor 221 to be turned off.
The thyristor unit 220 includes a first thyristor 221 and a second thyristor 222 connected in parallel in reverse direction, the structure is simple by controlling the current direction through the two thyristors, and the thyristors can work under the conditions of high voltage and large current, and the control of the working process is convenient.
Referring to fig. 1 and 2, the energy consumption branch 400 includes an energy consumption resistor 410 and a control switch 420 connected in series. The controller 300 is connected to the control switch 420, and the controller 300 may control the control switch 420 to be turned off or on for a plurality of times to gradually consume the energy stored in the capacitor 230 and the inductor 210.
It should be noted that the energy dissipation branch 400 may include an energy dissipation resistor 410, but is not limited thereto, and other energy dissipation elements may be adopted in the energy dissipation branch 400, as the case may be.
The energy consumption branch 400 includes an energy consumption resistor 410 and a control switch 420 connected in series, and the controller 300 may control the control switch 420 to be turned off or on for multiple times, so as to gradually consume the energy stored in the capacitor 230 and the inductor 210, thereby preventing the capacitor 230 from being damaged due to too high voltage at the two ends of the capacitor 230, and prolonging the service life of the dc circuit breaker.
Referring to fig. 1 and 2, the control switch 420 includes an integrated gate-commutated thyristor (i.e., IGCT), and the controller 300 is connected to the integrated gate-commutated thyristor and controls the integrated gate-commutated thyristor to be turned off or on, thereby controlling the energy consumption branch 400 to be turned off or on.
It should be noted that the control switch 420 may include an integrated gate commutated thyristor, but is not limited thereto, and the control switch 420 may also be other types of switching elements, such as an insulated gate bipolar transistor (i.e., IGBT), a turn-off thyristor (i.e., GTO), and the like, as the case may be.
The control switch 420 comprises an integrated gate commutated thyristor which combines the advantages of an insulated gate bipolar transistor with a turn-off thyristor, which has a capacity comparable to but at a faster switching speed than the turn-off thyristor, and which can eliminate the bulky and complex snubber circuit of the turn-off thyristor.
Referring to fig. 1 and 2, the dc circuit breaker further includes a comparison branch, the comparison branch is connected in parallel with the capacitor 230, the comparison branch is used for detecting a voltage across the capacitor 230, and both the comparison branch and the control switch 420 are connected to the controller 300. The power system has a positive bus 11 and a negative bus 12, and the two ends of the main flow-through branch 100 are connected with the positive bus 11 and the negative bus 12, so as to be connected with the power system. The voltage across the positive bus 11 and the voltage across the negative bus 12 can be indirectly detected by comparing the voltages across the branch detection capacitor 230.
When the comparing branch detects that the voltage across the capacitor 230 is greater than the first preset value, the controller 300 controls the control switch 420 to be turned on;
when the comparing branch detects that the voltage across the capacitor 230 is smaller than a second preset value, the controller 300 controls the control switch 420 to be turned off, and the second preset value is smaller than the first preset value.
It should be noted that the dc circuit breaker may include a comparing branch, but is not limited thereto, the comparing branch is used for detecting the voltage across the capacitor 230, and the comparing branch may also be replaced by other voltage detecting elements, such as a voltmeter or a voltage sensor, as the case may be. The comparing branch may be connected in parallel with the capacitor 230, but is not limited thereto, and both ends of the comparing branch may also be connected with the positive bus 11 and the negative bus 12 to directly detect voltages at both ends of the positive bus 11 and the negative bus 12, as the case may be.
In the existing direct current circuit breaker, the energy consumption branch 400 absorbs energy through the metal oxide arrester, and the metal oxide arrester is easy to damage when bearing overvoltage for many times, so that the service life of the direct current circuit breaker is shortened. In this application, the energy consumption branch 400 includes an energy consumption resistor 410 and a control switch 420, when the comparison branch detects that the voltage across the capacitor 230 is greater than a first preset value, that is, the voltages across the positive bus 11 and the negative bus 12 exceed a certain threshold, the controller 300 controls the control switch 420 to be turned on, the current passes through the energy consumption resistor 410, and the energy consumption resistor 410 consumes the energy of the commutation branch 200; when the comparison branch detects that the voltage at the two ends of the capacitor 230 is smaller than the second preset value, namely the voltage at the two ends of the positive bus 11 and the negative bus 12 is reduced to a certain threshold value, the controller 300 controls the control switch 420 to be switched off, the voltage at the two ends of the capacitor 230 is increased again due to the charging of the system current, and the energy of the commutation branch 200 is gradually consumed through the multiple-time switch control switch 420.
The operating principle of the direct current circuit breaker in this application is as follows:
stage I: when the power utilization system fails, the fault current rises exponentially, and the controller 300 detects that the power utilization system fails and sends a brake-off signal to the vacuum switch 120;
and stage II: the vacuum switch 120 receives a switching-off signal sent by the controller 300, and completes switching-off to disconnect the main flow branch 100;
stage III: the controller 300 controls the first thyristor 221 to be switched on and the second thyristor 222 to be switched off, the pre-charging capacitor 230 discharges, reverse current is generated in the commutation branch 200, the reverse current is superposed with system current, the current of the main circulation branch 100 crosses the zero point, and the electric arc of the vacuum arc extinguish chamber of the vacuum switch 120 is rapidly extinguished at the current crossing point;
stage IV: after the current of the main flow branch 100 crosses the zero point, the controller 300 controls the first thyristor 221 to be switched off and the second thyristor 222 to be switched on, the system current is transferred to the commutation branch 200 to charge the capacitor 230, and the voltage at the two ends of the capacitor 230 is increased;
and (5) stage V: the comparison branch monitors the voltages at two ends of the positive bus 11 and the negative bus 12 in real time, when the voltages at two ends of the positive bus 11 and the negative bus 12 exceed a certain threshold, the controller 300 controls the control switch 420 to be switched on, the current passes through the energy consumption resistor 410, the energy consumption resistor 410 consumes the energy of the commutation branch 200, when the voltages at two ends of the positive bus 11 and the negative bus 12 are reduced to the certain threshold, the controller 300 controls the control switch 420 to be switched off, the voltages at two ends of the capacitor 230 are increased again due to the charging of the system current, the energy of the commutation branch 200 is gradually consumed through the multiple-time switch control switch 420 until the energy stored by the inductor 210 and the capacitor 230 is released finally, and the direct current breaker completes one current switching operation.
Referring to fig. 1 and 2, the dc circuit breaker further includes a test branch 500, the test branch 500 is connected in parallel with the main flow branch 100, the test branch 500 is connected to the controller 300, the test branch 500 can detect a fault of the power consumption system, and the controller 300 controls the main flow branch 100 to be conducted after the test branch 500 detects that the fault of the power consumption system is eliminated. The dc circuit breaker may further include a disconnecting switch 600, wherein the disconnecting switch 600 connects the positive and negative buses and the main flow branch 100, that is, the positive bus 11 is connected to one end of the main flow branch 100 through the disconnecting switch 600, and the negative bus 12 is connected to the other end of the main flow branch 100 through another disconnecting switch 600.
After the power consumption system breaks down, the isolating switch 600 can be disconnected, after the fault of the power consumption system is eliminated, the isolating switch 600 is switched on, the line of the power consumption system needs to be tested through the testing branch 500, and the vacuum switch 120 is allowed to be switched on after the test is qualified, so that the direct current breaker can be prevented from being connected with the power consumption system with the fault, and the components of the power consumption system are prevented from being damaged.
Illustratively, the test branch 500 includes a test contactor 510, a test resistor 520, and a first current sensing element 530 in series.
It should be noted that the first current detecting element 530 may include a current sensor, but is not limited thereto, and the first current detecting element 530 may also include an ammeter, as the case may be.
The test resistor 520 is used as a load of the test branch 500, so that the test current can be prevented from being too large; the first current detection element 530 is configured to detect a test current, and indirectly determine whether a fault of the power consumption system is eliminated through the test current, and when the fault of the power consumption system is eliminated, the controller 300 controls the vacuum switch 120 to switch on; the test contactor 510 is used to quickly turn on or off to avoid closing on a faulty line.
The terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.
In this application, unless expressly stated or limited otherwise, the terms "mounted," "connected," and the like are to be construed broadly and include, for example, fixed connections, removable connections, or integral connections; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
In the description herein, references to the description of the terms "some embodiments," "exemplary," etc. mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or exemplary is included in at least one embodiment or exemplary of the application. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present application have been shown and described, it is understood that the above embodiments are illustrative and should not be construed as limiting the present application and that various changes, modifications, substitutions and alterations can be made therein by those skilled in the art within the scope of the present application, and therefore all changes and modifications that come within the meaning of the claims and the description of the invention are to be embraced therein.
Claims (10)
1. A direct current circuit breaker, comprising:
the main flow branch is used for connecting an electric system;
the controller is connected with the main flow branch and can control the main flow branch to disconnect the system current provided by the power utilization system when the power utilization system fails;
the current conversion branch is connected with the controller in parallel, and can generate reverse current under the control of the controller when the main flow branch cuts off the system current, wherein the reverse current is opposite to the system current.
2. The dc circuit breaker of claim 1, further comprising an energy consuming branch connected in parallel with the commutation branch, the energy consuming branch being capable of consuming energy of the commutation branch under control of the controller.
3. The dc circuit breaker of claim 2, wherein the commutation branch comprises an inductor, a thyristor unit and a capacitor in series, the thyristor unit having a first state in which the capacitor discharges to generate the reverse current through the thyristor unit, and a second state in which the system current passes through the thyristor unit;
the energy consumption branch is connected with the capacitor in parallel.
4. The direct current circuit breaker according to claim 3, characterized in that said thyristor unit comprises a first thyristor and a second thyristor connected in anti-parallel, in said first state said first thyristor being conductive and said second thyristor being open, in said second state said second thyristor being conductive and said first thyristor being open.
5. The dc circuit breaker according to claim 3, wherein said dissipating branch comprises a dissipating resistor and a control switch connected in series.
6. The direct current circuit breaker according to claim 5, characterized in that said control switch comprises an integrated gate commutated thyristor.
7. The direct current circuit breaker according to claim 5, further comprising a comparison branch, wherein the comparison branch is connected in parallel with the capacitor, the comparison branch is used for detecting a voltage across the capacitor, and the comparison branch and the control switch are both connected with the controller;
when the comparison branch detects that the voltage at two ends of the capacitor is greater than a first preset value, the controller controls the control switch to be conducted;
when the comparison branch detects that the voltage at the two ends of the capacitor is smaller than a second preset value, the controller controls the control switch to be switched off, and the second preset value is smaller than the first preset value.
8. The dc circuit breaker of claim 1, wherein the main flow branch includes a vacuum switch, the controller being connected to the vacuum switch.
9. The dc circuit breaker according to claim 1, further comprising a test branch, wherein the test branch is connected in parallel with the main flow branch, the test branch is connected to the controller, the test branch is capable of detecting a fault of the power consumption system, and the controller controls the main flow branch to be turned on after the test branch detects that the fault of the power consumption system is eliminated.
10. The dc circuit breaker according to claim 9, characterized in that said test branch comprises a test contactor, a test resistor and a first current detection element in series.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221310479.5U CN217522571U (en) | 2022-05-27 | 2022-05-27 | Direct current breaker |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202221310479.5U CN217522571U (en) | 2022-05-27 | 2022-05-27 | Direct current breaker |
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| CN217522571U true CN217522571U (en) | 2022-09-30 |
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