CN210183005U - Circuit breaker protection circuit, circuit breaker and photovoltaic inverter - Google Patents
Circuit breaker protection circuit, circuit breaker and photovoltaic inverter Download PDFInfo
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- CN210183005U CN210183005U CN201921311707.9U CN201921311707U CN210183005U CN 210183005 U CN210183005 U CN 210183005U CN 201921311707 U CN201921311707 U CN 201921311707U CN 210183005 U CN210183005 U CN 210183005U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
Abstract
The utility model provides a circuit breaker protection circuit, a circuit breaker and a photovoltaic inverter, which are applied to the technical field of power electronics, wherein a first input end of a first controller in the protection circuit is connected with a first output end of a second controller in an application device where the circuit breaker to be controlled is positioned, and receives a trigger signal; the second input end of the first controller is connected with the second output end of the second controller, and receives the control signal; the output end of the first controller is connected with the control end of the circuit breaker to be controlled, and outputs a breaking signal to the control end of the fault circuit breaker. When the first controller receives at least one signal for maintaining the breaking of the fault circuit breaker, the first controller sends a breaking signal to maintain the circuit breaker to be controlled in a breaking state, so that the probability of wrong switching-on operation of operation and maintenance personnel can be reduced, the service life loss of the circuit breaker is delayed, and the personal safety of the operation and maintenance personnel and the safety of electrical equipment in a line are ensured.
Description
Technical Field
The utility model relates to a power electronic technology field, in particular to circuit breaker protection circuit, circuit breaker and photovoltaic inverter.
Background
The circuit breaker arranged on the direct current side of the centralized photovoltaic inverter is mainly used for switching on and off the normal working current of the photovoltaic inverter and switching off the fault current when a circuit fails, and is one of the very important electrical devices in the photovoltaic power generation system.
Due to the characteristics of the structure of the circuit breaker, the circuit breaker can only bear current breaking operation for a limited number of times, and after each breaking, the arc extinguishing capacity of an arc extinguishing piece in the circuit breaker can be weakened, the breaking times are more, the arc spraying phenomenon is more serious when the circuit breaker performs the breaking operation, and the breaking time is longer.
However, in the practical use of the circuit breaker, sometimes, the operation and maintenance personnel directly perform the switching-on operation on the circuit breaker without checking, if the fault in the circuit is not eliminated yet, the circuit breaker cannot be switched on successfully, and further, the circuit breaker needs to perform a breaking operation again, so that the service life of the circuit breaker is shortened due to the wrong switching-on operation, and meanwhile, the damage of electrical equipment can be caused, and even the personal safety of the operation and maintenance personnel is damaged.
SUMMERY OF THE UTILITY MODEL
The utility model provides a circuit breaker protection circuit, circuit breaker and photovoltaic inverter reduce fortune dimension personnel and go wrong probability of closing a floodgate operation, delay the life-span loss of circuit breaker, ensure fortune dimension personnel's personal safety and electrical equipment's in the circuit security.
In order to achieve the purpose, the technical scheme provided by the application is as follows:
in a first aspect, the present invention provides a circuit breaker protection circuit, including: a first controller, wherein,
the first input end of the first controller is connected with the first output end of a second controller in an application device where a circuit breaker to be controlled is located, and receives a trigger signal; the trigger signal is a signal which is generated and output by the second controller according to sampling information of a preset electrical parameter of the circuit breaker to be controlled and maintains the breaking of the fault circuit breaker, or a signal which is generated and output by the second controller according to a reclosing instruction and allows the fault circuit breaker to be closed;
the second input end of the first controller is connected with the second output end of the second controller, and receives a control signal; the control signal is a signal which is generated and output by the second controller according to sampling information of a preset electrical parameter of the circuit breaker to be controlled and maintains the breaking of the fault circuit breaker, or a signal which is generated and output by the second controller when a closing condition is met and allows the fault circuit breaker to be closed;
the output end of the first controller is connected with the control end of the circuit breaker to be controlled, and outputs a breaking signal to the control end of the fault circuit breaker; the output condition of the breaking signal is that at least one of the control signal and the trigger signal stored in the first controller is a signal for maintaining the breaking of the fault circuit breaker.
Optionally, the output end of the first controller further outputs a closing signal to the control end of the fault circuit breaker; the output condition of the closing signal is that the control signal and the trigger signal are both signals allowing the fault circuit breaker to close.
Optionally, the first controller comprises a memory and a control circuit, wherein,
a preset input end of the memory is used as a first input end of the first controller, and receives a trigger signal sent by the second controller through the first output end;
a first preset input end of the control circuit is used as a second input end of the first controller, and receives a control signal sent by the second controller through the second output end;
a second preset input end of the control circuit is connected with a preset output end of the memory and receives the trigger signal stored in the memory;
and a preset output end of the control circuit is used as an output end of the first controller.
Optionally, the control end of the circuit breaker to be controlled is the input end of a trip coil of the circuit breaker to be controlled.
Optionally, when the control signal and the trigger signal are signals for maintaining the breaking of the fault circuit breaker, the preset electrical parameter of the circuit breaker to be controlled represents that the corresponding circuit breaker is in a fault state.
Optionally, the utility model discloses the circuit breaker protection circuit that any one of aspect provided, treat that the control circuit breaker includes a circuit breaker at least.
In a second aspect, the present invention provides a circuit breaker, including: an actuator, a trip coil, and a circuit breaker protection circuit according to any of the first aspect of the present invention, wherein,
the input end of the actuating mechanism is used as the input end of the circuit breaker, and the output end of the actuating mechanism is used as the output end of the circuit breaker;
a second controller arranged in an application device where the circuit breaker is located collects preset electrical parameters of an input end of the actuating mechanism;
and the input end of the trip coil is used as the control end of the circuit breaker and is connected with the output end of a first controller in the circuit breaker protection circuit.
A third aspect of the present invention provides a photovoltaic inverter, including: at least one circuit breaker, an inverter circuit, a second controller, and the circuit breaker protection circuit of any of claims 1-6,
the input end of the circuit breaker is connected with a direct current power supply, and the output end of the circuit breaker is connected with the direct current input end of the inverter circuit;
the alternating current output end of the inverter circuit is connected with a public power grid or a load;
a first input end of the second controller receives sampling information of preset electrical parameters of input ends of the circuit breakers;
and a second input end of the second controller receives a reclosing command.
Optionally, the system further comprises a human-computer interaction interface, and the human-computer interaction interface is connected with the first output end of the second controller.
Optionally, the system further comprises a reclosing instruction generating device;
the input end of the reclosing instruction generating device receives trigger information used for generating the reclosing instruction;
and the output end of the reclosing instruction generating device is connected with the second input end of the second controller.
The utility model provides a circuit breaker protection circuit, which comprises a first controller, wherein a first input end of the first controller is connected with a first output end of a second controller in an application device where a circuit breaker to be controlled is positioned, and receives a trigger signal; the second input end of the first controller is connected with the second output end of the second controller, and receives the control signal; the output end of the first controller is connected with the control end of the circuit breaker to be controlled, and outputs a breaking signal to the control end of the fault circuit breaker. The trigger signal is a signal which is generated and output by the second controller according to sampling information of a preset electrical parameter of the circuit breaker to be controlled and maintains the breaking of the fault circuit breaker, or a signal which is generated and output by the second controller according to a reclosing instruction triggered by operation and maintenance personnel and allows the fault circuit breaker to be closed; the control signal is a signal which is generated and output by the second controller according to the sampling information of the preset electrical parameter of the circuit breaker to be controlled and maintains the breaking of the fault circuit breaker, or a signal which is generated and output by the second controller when the switching-on condition is met and allows the fault circuit breaker to be switched on. The first controller outputs a breaking signal to a control end of the fault circuit breaker when at least one of the control signal and the trigger signal stored in the first controller is a signal for maintaining the breaking of the fault circuit breaker.
Through the utility model provides a circuit breaker protection circuit, when receiving at least one signal for maintaining the disconnected state of trouble circuit breaker, first controller sends disconnected signal promptly, maintains to wait to control the circuit breaker and is in disconnected state; under the condition that the circuit breaker to be controlled breaks down, even if the control signal which is generated and output after the reclosing instruction is triggered by an operation and maintenance person and allows the fault circuit breaker to be switched on cannot enable the circuit breaker to be controlled to be switched on, therefore, the probability of wrong switching-on operation of the operation and maintenance person can be reduced, the service life loss of the circuit breaker is delayed, and the personal safety of the operation and maintenance person and the safety of electrical equipment in a circuit are ensured.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic diagram of a connection relationship when a circuit breaker protection circuit provided by an embodiment of the present invention protects a circuit breaker to be controlled;
fig. 2 is a schematic diagram of another connection relationship when the circuit breaker protection circuit provided by the embodiment of the present invention protects the circuit breaker to be controlled;
fig. 3 is a block diagram of a circuit breaker according to an embodiment of the present invention;
fig. 4 is a block diagram of a photovoltaic inverter according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Referring to fig. 1, fig. 1 is a schematic diagram of a connection relationship when a circuit breaker protection circuit provided by an embodiment of the present invention protects a circuit breaker to be controlled, the circuit breaker protection circuit provided by an embodiment of the present invention includes a first controller 10, wherein,
a first input end of the first controller 10 is connected to a first output end of the second controller 20, and receives a trigger signal sent by the second controller 20 through the first output end, and the first controller 10 further stores the trigger signal, wherein the second controller 20 is disposed in an application device where the circuit breaker 30 to be controlled is located, such as a photovoltaic inverter having a circuit breaker disposed on a dc side.
Optionally, the trigger signal is a signal generated and output by the second controller 20 according to the sampling information of the preset electrical parameter of the circuit breaker 30 to be controlled, and used for maintaining the breaking of the fault circuit breaker; alternatively, the second controller 20 generates and outputs a signal for allowing the fault circuit breaker to be switched on according to a reclosing command triggered by an operation and maintenance person. It should be noted that the embodiment of the present invention provides a circuit breaker to be controlled includes at least one circuit breaker, and the fault circuit breaker refers to the circuit breaker that needs to carry out reclosing control in the circuit breaker to be controlled, therefore, the embodiment of the present invention provides a fault controller that can include one, also can include a plurality of, the embodiment of the present invention provides a circuit breaker protection circuit that can provide protection for a plurality of circuit breakers simultaneously, and then can realize through the mode among the prior art to the discernment of circuit breaker, and this embodiment does not limit to this.
Specifically, the preset electrical parameter of the circuit breaker 30 to be controlled at least includes one of a voltage parameter and a current parameter. To the judgement of waiting to control circuit breaker 30 fault state, can adopt among the prior art than the sampling current value and predetermine the big or small relation of electric current threshold value and judge, perhaps, adopt among the prior art than the sampling voltage value and predetermine the big or small relation of voltage threshold value and judge, the utility model discloses do not restrict to the mode of judging the running state of waiting to control circuit breaker 30.
The second controller 20 receives a reclosing instruction triggered by an operation and maintenance worker, and generates and outputs a trigger signal allowing the fault circuit breaker to be closed after receiving the reclosing instruction, which can also be implemented based on the prior art, for example, the operation and maintenance worker outputs a high level through a fault reclosing button, and the second controller 20 outputs the trigger signal allowing the fault circuit breaker to be closed after receiving the high level through a corresponding pin. The embodiment of the utility model provides a receive the reclosing command that the fortune dimension personnel triggered to second controller 20 to generate and export the mode that allows the trigger signal that the fault circuit breaker closed a floodgate after receiving the reclosing command and do not do the injecing.
A second input of the first controller 10 is connected to a second output of the second controller 20 for receiving a control signal. The control signal is a signal generated and output by the second controller 20 according to the sampling information of the preset electrical parameter of the circuit breaker to be controlled and used for maintaining the disconnection of the fault circuit breaker, or a signal generated and output by the second controller 20 when a switching-on condition is met and used for allowing the switching-on of the fault circuit breaker.
Specifically, as described above, the second controller 20 collects sampling information of a preset electrical parameter of the circuit breaker to be controlled, and if it is determined that the circuit breaker 30 to be controlled is in a fault state according to the sampling information of the preset electrical parameter, generates and outputs a control signal for maintaining the breaking of the fault circuit breaker through the second output terminal, that is, the second controller 20 outputs a trigger signal for maintaining the breaking of the fault circuit breaker through the first output terminal and outputs a control signal for maintaining the breaking of the fault circuit breaker through the second output terminal when it is determined that the circuit breaker 30 to be controlled is in the fault state according to the sampling information of the preset electrical parameter of the circuit breaker 30 to be controlled.
Further, when the second controller 20 satisfies the closing condition, for example, when the controlled circuit breaker 30 is cleared after restarting, the second controller 20 also sends a control signal for allowing the circuit breaker to close to the fault to the first controller 10 through the second output terminal. It should be noted that the control signal generated by the second controller 20 can also be implemented by the prior art, and is not described herein again.
The output terminal of the first controller 10 is connected to the control terminal of the circuit breaker 30 to be controlled. Alternatively, the control terminal of the circuit breaker 30 to be controlled may be an input terminal of a trip coil of the circuit breaker 30 to be controlled. The first controller 10 outputs a breaking signal to a control terminal of the fault circuit breaker to maintain the fault circuit breaker in a breaking state when at least one of the control signal received through the second input terminal and the trigger signal stored in the first controller 10 is a signal for maintaining the breaking of the fault circuit breaker. Specifically, the first controller 10 outputs a breaking signal to a trip coil of the fault circuit breaker to electrify the trip coil of the fault circuit breaker, so that the fault circuit breaker cannot perform a closing operation.
Accordingly, the output terminal of the first controller 10 may also output a closing signal to the control terminal of the fault circuit breaker to recover the closing function of the fault circuit breaker when the control signal received through the second input terminal and the trigger signal received through the first input terminal are both signals that allow the fault circuit breaker to be closed. Specifically, this closing signal makes the trip coil of fault circuit breaker down the electricity, and then makes fault circuit breaker resume the function of closing a floodgate, under this kind of circumstances, if fortune dimension personnel operate the closing switch of corresponding circuit breaker, then can normally close a floodgate.
The following specifically introduces the operation process of the circuit breaker protection circuit provided by the embodiment of the present invention in different situations by combining the above contents:
the second controller 20 collects sampling information of a preset electrical parameter of the circuit breaker 30 to be controlled, and if the circuit breaker 30 to be controlled is judged to have a short-circuit fault according to the obtained sampling information of the preset electrical parameter, the second controller 20 sends a trigger signal for maintaining the breaking of the fault circuit breaker to the first controller 10 through the first output end, and simultaneously sends a control signal for maintaining the breaking of the fault circuit breaker to the first controller 10 through the second output end. After receiving the two signals, the first controller 10 sends an open signal to the fault circuit breaker, so as to maintain the open state of the fault circuit breaker.
Under the above condition, if an operation and maintenance person triggers a reclosing instruction without checking, after receiving the reclosing instruction, the second controller 20 generates a triggering signal for allowing the fault circuit breaker to be closed, and sends the triggering signal to the first controller 10 through the first output end. In this case, since the short-circuit fault is not eliminated, the first controller 10 still receives the control signal for maintaining the disconnection of the fault circuit breaker through the second input terminal, the first controller 10 outputs the disconnection signal for maintaining the disconnection state of the fault circuit breaker, and even if the maintenance worker operates the closing switch of the fault circuit breaker, the closing cannot be successful because the trip coil of the fault circuit breaker is in the charged state.
In addition, if the short-circuit fault of the circuit breaker to be controlled is eliminated, the second controller 20 outputs a control signal for allowing the fault circuit breaker to be switched on through the second output end, if the operation and maintenance personnel directly operate the switching-on switch of the fault circuit breaker under the condition that the reclosing instruction is not manually triggered, because the trigger signal for maintaining the breaking of the fault circuit breaker when the short-circuit fault occurs is still stored in the first controller 10, the first controller 10 still maintains the fault circuit breaker in the breaking state, the fault circuit breaker cannot be successfully switched on, and only after the operation and maintenance personnel manually trigger the reclosing instruction, the switching-on can be successfully performed, so that the operation safety is ensured.
In summary, with the circuit breaker protection circuit provided by the embodiment of the present invention, when receiving at least one signal for maintaining the disconnection of the fault circuit breaker, the first controller sends a disconnection signal to maintain the circuit breaker to be controlled in a disconnection state; under the condition that the circuit breaker to be controlled breaks down, even if the control signal which is generated and output after the reclosing instruction is triggered by an operation and maintenance person and allows the fault circuit breaker to be switched on cannot enable the circuit breaker to be controlled to be switched on, therefore, the probability of wrong switching-on operation of the operation and maintenance person can be reduced, the service life loss of the circuit breaker is delayed, and the personal safety of the operation and maintenance person and the safety of electrical equipment in a circuit are ensured.
It should be noted that, in the circuit breaker protection circuit provided in the embodiment of the present invention, the comparison and determination process of the first controller for the received trigger signal and the control signal is implemented based on the prior art, and this embodiment does not improve this. For example, the first controller may set a logic and gate circuit for a fault, and use the trigger signal and the control signal as inputs of the logic and gate circuit, respectively, where an output signal of the fault is a signal sent to the fault circuit breaker. As another example, the first controller includes a microcontroller, and the trigger signal and the control signal are two variables received by the microcontroller, and the specific values of the two variables are compared by using the method in the prior art, which obviously does not need to be improved. The embodiment of the utility model provides a key still lies in the improvement of relation of connection and circuit structure.
Optionally, refer to fig. 2, which is a schematic diagram of another connection relationship when the circuit breaker protection circuit provided by the embodiment of the present invention protects the circuit breaker to be controlled, on the basis of the embodiment shown in fig. 1, the embodiment shown in fig. 2 provides an optional configuration of the first controller 10 in the circuit breaker protection circuit, including: a memory 101 and a control circuit 102, wherein,
the preset input terminal of the memory 101 serves as a first input terminal of the first controller 10, and receives the trigger signal sent by the second controller 20 through the first output terminal.
A first preset input of the control circuit 102 serves as a second input of the first controller 10, and receives a control signal sent by the second controller 20 through a second output. A second preset input terminal of the control circuit 102 is connected to a preset output terminal of the memory 101, and receives the trigger signal stored in the memory 101. A preset output end of the control circuit 102 is used as an output end of the first controller 10 and is connected with a control end of the circuit breaker to be controlled.
Alternatively, the memory 101 may be a non-volatile memory, such as a FLASH memory. The non-volatile memory is selected to ensure that the trigger signal stored in the memory cannot be lost after the protection circuit is restarted, so that the operation and maintenance personnel must manually trigger a reclosing instruction to replace the trigger signal which is stored in the memory and used for maintaining the breaking of the fault circuit breaker with the trigger signal used for allowing the fault circuit breaker to be closed under the condition of short-circuit fault elimination, the reclosing of the fault circuit breaker can be realized, and the operation safety is ensured.
The circuit breaker protection circuit shown in fig. 2 is described with respect to a specific configuration of the first controller, but the protection principle and operation process of the circuit breaker to be controlled are the same as those of the embodiment shown in fig. 1, and will not be repeated here.
Optionally, refer to fig. 3, fig. 3 is a block diagram of a circuit breaker according to an embodiment of the present invention, the circuit breaker according to an embodiment of the present invention includes: the actuator 40, trip coil 50, and circuit breaker protection circuit of any of the above embodiments, wherein,
the input end of the actuating mechanism 40 is used as the input end of the circuit breaker, and the output end of the actuating mechanism 40 is used as the output end of the circuit breaker;
the second controller 20 arranged in the application device where the circuit breaker is located collects preset electrical parameters of the input end of the actuating mechanism 40;
the input terminal of the trip coil 50 is used as the control terminal of the circuit breaker, and is connected to the output terminal of a driving circuit (not shown in the figure) provided in the first controller 10 in the circuit breaker protection circuit.
The embodiment of the utility model provides a circuit breaker, on the basic structure's of circuit breaker basis among the prior art, the circuit breaker protection circuit that any one of integrated above-mentioned embodiment provided carries out more effectual protection to the operation of circuit breaker, can reduce fortune dimension personnel's wrong switching-on operation's probability, delays the life-span loss of circuit breaker, ensures fortune dimension personnel's personal safety and electrical equipment's in the circuit security.
It is conceivable that the circuit breaker protected by the present embodiment includes a basic structure, that is, the basic structure included in the circuit breaker to be controlled described in any of the above embodiments, and the present embodiment is an improvement on each circuit breaker in the circuit breaker to be controlled.
Optionally, refer to fig. 4, fig. 4 is a block diagram of a photovoltaic inverter provided in an embodiment of the present invention, and a photovoltaic inverter provided in an embodiment of the present invention includes: at least one circuit breaker 60, an inverter circuit 70, a second controller 20, and a circuit breaker protection circuit provided in any of the above embodiments shown in fig. 1 and 2, wherein,
the input end of the circuit breaker 60 is connected with the direct current power supply 80, and the output end of the circuit breaker 60 is connected with the direct current input end of the inverter circuit 70;
the ac output of inverter circuit 70 is connected to a utility grid or load 90;
the second controller 20 is arranged in the photovoltaic inverter, and a first input end of the second controller 20 receives sampling information of preset electrical parameters at input ends of the circuit breakers 60;
a second input of the second controller 20 receives a reclosing command triggered by the operation and maintenance personnel. Optionally, the embodiment of the utility model provides a photovoltaic inverter still includes reclosing lock instruction generating device (not shown in the figure), and reclosing lock instruction generating device's output links to each other with the second input of second controller, and the input that reclosing lock instruction generating device generated receives fortune dimension personnel's trigger information to after receiving corresponding trouble trigger information, send the reclosing lock instruction to the second controller through the output.
The circuit breaker protection circuit (shown in fig. 4 as including the first controller 10) is integrated in the photovoltaic inverter provided in this embodiment, and is connected to the existing second controller and circuit breaker in the photovoltaic inverter, so as to protect each circuit breaker in the photovoltaic inverter.
It is conceivable that the circuit breaker 60 in the photovoltaic inverter provided in the present embodiment may be the circuit breaker to be controlled as described in the foregoing embodiments shown in fig. 1 and fig. 2.
Optionally, the embodiment of the utility model provides a photovoltaic inverter still includes human-computer interface (not shown in the figure), for example, the display screen. The human-computer interface is connected to a first output end of the second controller 20, and is configured to display operation information of each circuit breaker in the photovoltaic inverter, such as short-circuit fault information. Of course, the human-computer interface may also be connected to a second input terminal of the second controller 20, and the operation and maintenance personnel may input control information to the second controller 20 through the human-computer interface.
The embodiments of the present invention are described in a progressive manner, each embodiment is mainly described as different from the other embodiments, and the same similar parts between the embodiments are referred to each other.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention in any way. Although the present invention has been described with reference to the preferred embodiments, it is not intended to limit the present invention. The invention is not limited to the embodiments described herein, but is capable of other embodiments according to the invention, and may be used in various other applications, including, but not limited to, industrial. Therefore, any simple modification, equivalent change and modification made to the above embodiments by the technical entity of the present invention all still fall within the protection scope of the technical solution of the present invention, where the technical entity does not depart from the content of the technical solution of the present invention.
Claims (10)
1. A circuit breaker protection circuit, comprising: a first controller, wherein,
the first input end of the first controller is connected with the first output end of a second controller in an application device where a circuit breaker to be controlled is located, and receives a trigger signal; the trigger signal is a signal which is generated and output by the second controller according to sampling information of a preset electrical parameter of the circuit breaker to be controlled and maintains the breaking of the fault circuit breaker, or a signal which is generated and output by the second controller according to a reclosing instruction and allows the fault circuit breaker to be closed;
the second input end of the first controller is connected with the second output end of the second controller, and receives a control signal; the control signal is a signal which is generated and output by the second controller according to sampling information of a preset electrical parameter of the circuit breaker to be controlled and maintains the breaking of the fault circuit breaker, or a signal which is generated and output by the second controller when a closing condition is met and allows the fault circuit breaker to be closed;
the output end of the first controller is connected with the control end of the circuit breaker to be controlled, and outputs a breaking signal to the control end of the fault circuit breaker; the output condition of the breaking signal is that at least one of the control signal and the trigger signal stored in the first controller is a signal for maintaining the breaking of the fault circuit breaker.
2. The circuit breaker protection circuit of claim 1, wherein the output of the first controller further outputs a closing signal to a control terminal of a fault circuit breaker; the output condition of the closing signal is that the control signal and the trigger signal are both signals allowing the fault circuit breaker to close.
3. The circuit breaker protection circuit of claim 1, wherein said first controller comprises a memory and a control circuit, wherein,
a preset input end of the memory is used as a first input end of the first controller, and receives a trigger signal sent by the second controller through the first output end;
a first preset input end of the control circuit is used as a second input end of the first controller, and receives a control signal sent by the second controller through the second output end;
a second preset input end of the control circuit is connected with a preset output end of the memory and receives the trigger signal stored in the memory;
and a preset output end of the control circuit is used as an output end of the first controller.
4. The circuit breaker protection circuit of claim 1, wherein the control terminal of the circuit breaker to be controlled is an input terminal of a trip coil of the circuit breaker to be controlled.
5. The circuit breaker protection circuit of claim 1, wherein when the control signal and the trigger signal are signals for maintaining the open state of the failed circuit breaker, the predetermined electrical parameter of the circuit breaker to be controlled represents that the corresponding circuit breaker is in a fault state.
6. The circuit breaker protection circuit of any of claims 1-5, wherein the circuit breaker to be controlled comprises at least one circuit breaker.
7. A circuit breaker, comprising: the actuator, trip coil, and circuit breaker protection circuit of any of claims 1-6, wherein,
the input end of the actuating mechanism is used as the input end of the circuit breaker, and the output end of the actuating mechanism is used as the output end of the circuit breaker;
a second controller arranged in an application device where the circuit breaker is located collects preset electrical parameters of an input end of the actuating mechanism;
and the input end of the trip coil is used as the control end of the circuit breaker and is connected with the output end of a first controller in the circuit breaker protection circuit.
8. A photovoltaic inverter, comprising: at least one circuit breaker, an inverter circuit, a second controller, and the circuit breaker protection circuit of any of claims 1-6,
the input end of the circuit breaker is connected with a direct current power supply, and the output end of the circuit breaker is connected with the direct current input end of the inverter circuit;
the alternating current output end of the inverter circuit is connected with a public power grid or a load;
a first input end of the second controller receives sampling information of preset electrical parameters of input ends of the circuit breakers;
and a second input end of the second controller receives a reclosing command.
9. The pv inverter of claim 8 further comprising a human machine interface coupled to the first output of the second controller.
10. The photovoltaic inverter of claim 8, further comprising a reclosing command generating device;
the input end of the reclosing instruction generating device receives trigger information used for generating the reclosing instruction;
and the output end of the reclosing instruction generating device is connected with the second input end of the second controller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921311707.9U CN210183005U (en) | 2019-08-13 | 2019-08-13 | Circuit breaker protection circuit, circuit breaker and photovoltaic inverter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921311707.9U CN210183005U (en) | 2019-08-13 | 2019-08-13 | Circuit breaker protection circuit, circuit breaker and photovoltaic inverter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210183005U true CN210183005U (en) | 2020-03-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921311707.9U Active CN210183005U (en) | 2019-08-13 | 2019-08-13 | Circuit breaker protection circuit, circuit breaker and photovoltaic inverter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210183005U (en) |
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2019
- 2019-08-13 CN CN201921311707.9U patent/CN210183005U/en active Active
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