CN115692125A - Circuit breaker capable of setting protection current value and control method thereof - Google Patents

Abstract

The invention relates to a circuit breaker capable of setting a protection current value and a control method thereof, wherein the circuit breaker comprises a circuit breaker shell, an incoming line terminal, an outgoing line terminal, a setting module with a function of setting and displaying the protection current value, a current detection module and a control module, wherein the control module extracts the protection current value set by a user from the setting module, generates a control threshold value according to a preset load type and the protection current value, and controls an opening and closing module to cut off the electric connection between the incoming line terminal and the outgoing line terminal when the current value and the duration time are detected to exceed the control threshold value, so that overload protection is realized. The invention has no double metal sheets, overcomes the defect that the traditional air circuit breaker adopting the double metal sheets as overload protection is greatly influenced by temperature, and simultaneously, a user can flexibly set and change the protection current value of the circuit breaker according to the requirement.

Description

A circuit breaker capable of setting protection current value and its control method

technical field

The invention relates to the field of intelligent control of building electrical power supply and distribution, in particular to a circuit breaker capable of setting a protection current value and a control method thereof.

Background technique

At present, buildings use miniature air circuit breakers to realize lighting and socket circuit opening and closing. In traditional air circuit breakers, short circuit protection relies on electromagnetic trippers, and overload protection relies on bimetallic strips. For loads of different sizes, Different bimetallic strips need to be equipped to achieve different current protection values. In the market, common air circuit breakers include 10A, 16A, 20A and other models, which are distinguished according to the overload protection current value.

Because the bimetal itself is affected by the ambient temperature, the overload protection deviation of this type of air circuit breaker is very large when used in outdoor high temperature and other occasions.

For example, the publication number CN110112701A, the Chinese patent application titled Embedded Intelligent Circuit Breaker, the disclosed air circuit breaker includes a current detection and relay module, but the overload protection still relies on bimetallic strips, and the user cannot install the air circuit breaker by himself. Or remotely set the overload protection current value.

Another type of hydraulic circuit breaker achieves different protection current values depending on the damping of the oil in the internal oil pipe. Although the influence of temperature on the current protection value is overcome, the protection current value of the products after leaving the factory is also fixed, and the user cannot flexibly adjust the protection current value of the circuit breaker.

For the above two types of circuit breakers, in actual engineering projects, it is necessary to prepare a large number of circuit breakers with different specifications and current values to meet the different sizes of line loads. The seller needs to stock air circuit breakers with various overload protection current specifications.

cause waste of resources. It is even impossible for the user to adjust the protection current value at any time according to the actual load change after the air circuit breaker is installed, and it is also impossible to remotely control the opening and closing of the air circuit breaker.

Contents of the invention

The purpose of the present invention is to provide a circuit breaker with a settable protection current value and its control method, which can set the overload protection current value of the circuit breaker arbitrarily without replacing hardware.

To achieve the above object, the present invention adopts the following technical solutions:

A circuit breaker capable of setting a protection current value and a control method thereof, comprising a casing, an incoming line terminal, an outgoing line terminal, a current detection module, an opening and closing module, a control module, and the opening and closing module is connected in series between the incoming line terminal and the Between the outlet terminals, it is used to cut off or conduct the electrical connection between the inlet terminals and the outlet terminals;

A setting module is connected to the control module, and the setting module is used to accept user settings and transmit setting signals corresponding to the user settings to the control module;

The current detection module is used to obtain the current current value between the incoming terminal and the outgoing terminal and transmit it to the control module;

The control module extracts the corresponding protection current value set by the user according to the setting signal, and generates a control threshold value according to the preset load type and the protection current value, and the control threshold value includes a current threshold value and a time threshold value. The magnitude of the current current value exceeds the current threshold, and the duration of the current current value exceeds the time threshold, and the control module controls the switch module to cut off the connection between the incoming line terminal and the outgoing line terminal. electrical connection.

Preferably, the current detection module is a current transformer with a magnetic ring, the loop between the incoming terminal and the outgoing terminal passes through the magnetic ring of the current transformer, and the switching module is a There is a magnetic latching relay with a manual lever, and an operation hole is opened on the housing corresponding to the position of the manual lever, and the manual lever can be operated outside the casing to make the magnetic latching relay cut off or connect the incoming line terminal and all The electrical connection between the outlet terminals.

Preferably, the operating part of the setting module is exposed on the housing, and the housing is provided with a current value mark corresponding to the position of the operating part, and the setting module is set by the user to point to different The current value, the control module is configured such that: the current protection value is associated with the corresponding current value marked on the setting module.

Preferably, the operation part is a digital dial switch, and the protection current value corresponds to the binary value of the current state of the digital dial switch.

Preferably, the operation part is a button and N indicator lights, N is a positive integer not less than 2, the indicator lights and buttons are connected to the control module, and each indicator light corresponds to a different current on the casing Numerical identification, jog and press the button, which is used to light up the indicator lights corresponding to different current value positions, and the protection current value corresponds to the value corresponding to the currently lit indicator light.

Preferably, the control module includes a communication unit and a command unit and a relay drive unit connected thereto, an external remote control signal is transmitted to the command unit through the communication unit, and the command unit controls the The switch module connects or disconnects the circuit.

Preferably, the housing is provided with a two-digit communication connection terminal and a programming button, and the external control bus is connected to the communication unit through the communication connection terminal on the housing, and the communication unit has two DC power output Pin, one output pin outputs the first DC power supply to the command unit, the other output pin outputs the second DC power supply to the relay drive unit, the voltage of the second DC power supply is higher than the voltage of the first DC power supply, the programming button Connected to the command unit for downloading the application program of the control module.

Preferably, the housing is provided with power terminals, and there is a power supply unit inside the housing, the external power supply is connected to the power supply unit through the power terminals, and the power supply unit outputs DC power to the communication unit, command unit and relay drive unit Power supply, the communication unit is equipped with WiFi, Bluetooth and 4G wireless transceiver circuits, external control commands are transmitted to the communication unit through wireless signals, and then transmitted to the command unit after being decoded by the communication unit.

A method for controlling a circuit breaker capable of setting a protection current value, based on the circuit breaker capable of setting a protection current value, comprising the following steps:

Obtaining user settings through the setting module;

The setting module transmits the protection current value corresponding to the user setting to the control module;

The control module generates a control threshold according to the preset load type and the protection current value;

Obtain the current current value between the incoming terminal and the outgoing terminal through the current detection module and transmit it to the control module;

When the current current value and duration exceed the control threshold, the control module controls the switching module to cut off the electrical connection between the incoming line terminal and the outgoing line terminal.

After adopting the above structure and method, the present invention cancels the bimetal sheet used as the overload protection detection part in the traditional air circuit breaker, and solves the problem that the current value of the traditional bimetal sheet cannot be changed and is greatly affected by the ambient temperature. The present invention uses a current transformer to detect the loop current, and the switch module controls the loop on and off; the setting module transmits the protection current value corresponding to the user setting signal to the control module, and the control module Extract the protection current value set by the user, and the control module generates a control threshold according to the preset load type and the protection current value; the control threshold includes a current threshold and a time threshold, and the current detection module obtains the current current value and transmitted to the control module; when the current current value exceeds the current threshold and the duration of the current current exceeds the time threshold, the control module controls the switch module to cut off the The electrical connection between the wire terminal and the outlet terminal enables the user to set the current value of the overload protection for the same circuit breaker of the present invention, and obtains the same hardware, and the user can change the current value of the overload protection arbitrarily, expanding the Excellent effect on the scope of application of the circuit breaker.

As a further solution, the operating part of the setting module of the present invention is placed outside the housing, which is convenient for users to operate. The operating part is a digital dial switch, and the user can intuitively set the protection current through the digital dial switch and the corresponding number on the housing. value,

As a further solution, the operation part can also be a button and an indicator light corresponding to the value. The user presses the button to light up the indicator light corresponding to different current value positions, and can also conveniently transmit the current value set by the user to the control module.

As a further solution, the control module includes a communication unit, a command unit, and a relay drive unit. The communication unit has a wired communication terminal and a programming button. At the same time, the communication unit has two DC power output pins. Supplying power to the command unit and the relay drive unit realizes remote setting and control, simplifies the circuit and improves reliability.

As a further solution, the housing is provided with a power terminal, and the communication unit is equipped with WiFi, Bluetooth and 4G wireless transceiver circuits, no need to connect wired control lines, and external control commands are transmitted to the communication unit through wireless without the need for control lines. After being decoded by the communication unit, it is passed to the command unit. The setting current value and circuit breaker status can be easily changed.

Description of drawings

Fig. 1 is an axonometric step sectional view of Embodiment 1 of the present invention.

Fig. 2 is an axonometric view of Embodiment 1 of the present invention.

Fig. 3 is a working principle block diagram of Embodiment 1 of the present invention.

FIG. 4 is a circuit schematic diagram of a control module according to Embodiment 1 of the present invention.

Fig. 5 is an axonometric view of Embodiment 2 of the present invention.

Fig. 6 is a block diagram of the working principle of Embodiment 2 of the present invention.

Fig. 7 is an axonometric step sectional view of Embodiment 3 of the present invention.

Fig. 8 is a working principle block diagram of Embodiment 3 of the present invention.

FIG. 9 is a schematic flowchart of Embodiment 1 of the present invention.

Detailed ways

In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

Embodiment one

A circuit breaker capable of setting a protection current value and a control method thereof, comprising a casing, an incoming line terminal, an outgoing line terminal, a current detection module, an opening and closing module, a control module, and the opening and closing module is connected in series between the incoming line terminal and the Between the outlet terminals, it is used to cut off or conduct the electrical connection between the inlet terminals and the outlet terminals;

A setting module is connected to the control module, and the setting module is used to accept user settings and transmit setting signals corresponding to the user settings to the control module;

The current detection module is used to obtain the current current value between the incoming terminal and the outgoing terminal and transmit it to the control module;

The control module extracts the corresponding protection current value set by the user according to the setting signal, and generates a control threshold value according to the preset load type and the protection current value, and the control threshold value includes a current threshold value and a time threshold value. The magnitude of the current current value exceeds the current threshold, and the duration of the current current value exceeds the time threshold, and the control module controls the switch module to cut off the connection between the incoming line terminal and the outgoing line terminal. electrical connection.

Preferably, the current detection module is a current transformer with a magnetic ring, the loop between the incoming terminal and the outgoing terminal passes through the magnetic ring of the current transformer, and the switching module is a There is a magnetic latching relay with a manual lever, and an operation hole is opened on the housing corresponding to the position of the manual lever, and the manual lever can be operated outside the casing to make the magnetic latching relay cut off or connect the incoming line terminal and all The electrical connection between the outlet terminals.

Preferably, the operating part of the setting module is exposed on the housing, and the housing is provided with a current value mark corresponding to the position of the operating part, and the setting module is set by the user to point to different The current value, the control module is configured such that: the current protection value is associated with the corresponding current value marked on the setting module.

Preferably, the operation part is a digital dial switch, and the protection current value corresponds to the binary value of the current state of the digital dial switch.

Preferably, the operation part is a button and N indicator lights, N is a positive integer not less than 2, the indicator lights and buttons are connected to the control module, and each indicator light corresponds to a different current on the casing Numerical identification, jog and press the button, which is used to light up the indicator lights corresponding to different current value positions, and the protection current value corresponds to the value corresponding to the currently lit indicator light.

Preferably, the control module includes a communication unit and a command unit and a relay drive unit connected thereto, an external remote control signal is transmitted to the command unit through the communication unit, and the command unit controls the The switch module connects or disconnects the circuit.

Preferably, the housing is provided with a two-digit communication connection terminal and a programming button, and the external control bus is connected to the communication unit through the communication connection terminal on the housing, and the communication unit has two DC power output Pin, one output pin outputs the first DC power supply to the command unit, the other output pin outputs the second DC power supply to the relay drive unit, the voltage of the second DC power supply is higher than the voltage of the first DC power supply, the programming button Connected to the command unit for downloading the application program of the control module.

Preferably, the housing is provided with power terminals, and there is a power supply unit inside the housing, the external power supply is connected to the power supply unit through the power terminals, and the power supply unit outputs DC power to the communication unit, command unit and relay drive unit Power supply, the communication unit is equipped with WiFi, Bluetooth and 4G wireless transceiver circuits, external control commands are transmitted to the communication unit through wireless signals, and then transmitted to the command unit after being decoded by the communication unit.

The external remote control signal of this embodiment is a KNX bus signal.

Fig. 1, Fig. 2, Fig. 3 and Fig. 4 are different views of Embodiment 1 of the present invention.

It can be seen from Fig. 1, Fig. 2 and Fig. 3 that this embodiment includes a housing 10, a mechanical locking handle 20 on the top of the housing, an incoming terminal 30 in the housing, an outgoing terminal 31, a moving and static contact group 21, an electromagnetic release Device 22, arc extinguishing device 23, current transformer 50 as a current detection module, switch module 40, control module 100 in the housing, setting module 80, programming button 90, and manual operation device on the housing 70, the communication connection terminal 60.

The switch module 40 is connected in series between the incoming line terminal 30 and the outgoing line terminal 31 , and is used for cutting off or conducting the electrical connection between the incoming line terminal 30 and the outgoing line terminal 31 .

The control module 100 is connected with a setting module 80, which is located on the surface of the housing. As can be seen from FIG. 2, the operating part of the setting module 80 is a circular digital dial switch. Corresponding to the code switch arrow. The circular digital dial switch accepts the user setting and transmits the setting signal corresponding to the user setting to the control module 100; wherein, the circular digital dial switch is an existing technology and is used for setting by the user. It is the binary encoding principle of 8421. The DIP switch corresponds to the different high and low levels of the four pins at the bottom of the DIP switch through the different positions of the knob pointer. For example, the 4 pins of the circular digital dial switch can output digital signals such as 0000, 0001, and 0010 to the control module, which are extracted and used to correspond to different current values.

It can be seen from Fig. 1 and Fig. 3 that the current detection module is the current transformer 50 below the outlet terminal 31, and the loop passes through the middle of the magnetic ring of the current transformer 50. When the current flows in the line, the coil of the current transformer 50 senses The loop current passing through the inside of the magnetic ring outputs corresponding proportional induced current signals at the two coil output pins of the current transformer 50 and transmits them to the control module.

As can be seen from FIG. 3 , the control module 100 is composed of a communication unit 611 , an instruction unit 612 , and a relay drive unit 613 . The control module receives the current current value of the loop from the current transformer 50 .

When in use, manually pull the mechanical locking handle 20 to compress the internal elastic element to store energy, and at the same time make the dynamic and static contact group 21 close. On the premise that the opening and closing module 40 is closed, the connection between the incoming line terminal 30 and the outgoing line terminal 31 When the loop is connected and the line is short-circuited, the loop current increases rapidly, and the large current flows through the electromagnetic release 22. The instantaneous magnetic field makes the electromagnetic release 22 trip, and the dynamic and static contact group 21 disconnects the loop, and at the same time, the linkage mechanical locking handle 20 Under the action of the elastic element, it turns back to the off position, and the arc extinguishing device 23 quickly extinguishes the arc generated by the breaking circuit, which plays the role of circuit short circuit protection.

At the same time, it can be seen from FIG. 2 that the operating part of the setting module 80 is a circular digital dial switch, and the numbers of different current values marked on the housing 10 correspond to the arrow positions of the circular digital dial switch.

Manually rotate the DIP switch by the user, the DIP switch stays in different positions, and the corresponding position on the housing is marked with current values such as 6A, 10A, 12A, and 16A, which are used to indicate the set protection current value. The protection current value corresponds to the binary value of the current state of the digital DIP switch. The digital dial switch of the setting module 80 is connected with the instruction unit 612 in the control module 100, and transmits the user setting signal to the control module 100, and the instruction unit 612 reads the binary value to extract the set protection current value.

For example, the user changes the output level of the output pin of the digital dial switch to 0001, then the control module extracts the corresponding protection current value set by the user according to the setting signal to 6A, and the user changes the output of the digital dial switch The pin output is 0010, then the control module extracts the corresponding protection current value set by the user according to the setting signal to be 10A, and the user changes the output pin of the digital dial switch to output 0011, then the control module According to the setting signal, the protection current value corresponding to the user setting is extracted to be 12A, etc., and so on.

The instruction unit 612 generates an overload protection control threshold value based on the extracted protection current value according to the preset load type and the protection current value, the control threshold value includes a current threshold value and a time threshold value, and is measured by the current transformer 50 When the current value of the current circuit exceeds the current threshold, the instruction unit 612 starts the preset program and starts timing. The overload time reaches a certain length of time and reaches the overload protection time threshold set by the program. At this time, the instruction unit 612 outputs a pulse control signal to the relay drive unit 613, the relay drive unit 613 has a built-in power amplifier circuit, and the relay drive unit 613 drives the switch module 40 to change the switch state, thereby changing the incoming line The connection or disconnection of the circuit between the terminal 30 and the outgoing terminal 31 plays a role of circuit overload protection.

According to different load types, such as Class C characteristics of architectural lighting and Class D characteristics of power distribution, circuit breakers correspond to international tripping characteristics (curves), C-type curves and D-type curves, overload current multiples and duration Different, the command unit presets different control thresholds (including current thresholds and time thresholds) for different load types according to the industry's general standards, such as the industry's general architectural lighting C-curve, when the load current exceeds 2 times the current threshold , the duration cannot exceed 10S, and the time threshold is set to 10S. If the load current exceeds 3 times the current threshold, the duration cannot exceed 5S, and the time threshold is 5S.

It can be seen from Figure 1 that in use, if the control bus fails, or the circuit breaker is overloaded to protect the power, it is necessary to manually control the opening and closing of the circuit, and the manual operation device 70 can be moved through the opening on the casing to drive the opening and closing module 40 to move , cutting off or closing the electrical connection between the incoming line terminal 30 and the outgoing line terminal 31 .

The current value of the overload protection of the present invention is a current value that can be changed artificially by setting the module 80. It is judged by the instruction unit 612 to extract the protection current value of the signal set by the setting module 80 as the overload protection control threshold, not a Fixed overload protection current value. After the product leaves the factory, or even after it is installed in the distribution box, the user can manually turn the DIP switch so that the DIP switch stays in different positions to change the current value of the overload protection. Therefore, the user only needs an air circuit breaker with the same hardware, and can change the overload protection current value according to the actual load change of the circuit after it is installed in the distribution box. Large inventory can be reduced.

For example, when a home user moves in, the overload protection current value is set to 10A. After buying a new household appliance, the load increases. The user can adjust the overload protection current value to 16A through the dial switch to adapt to the increase in household load. big.

The above is the implementation manner of locally setting the current protection value of the circuit breaker in this embodiment, and the function of remotely setting the current protection value in this embodiment is realized as follows.

As can be seen from Fig. 1, Fig. 2 and Fig. 3, an on-off module 40 is provided in this embodiment, and the control module 100 includes a communication unit 611, an instruction unit 612, and a relay drive unit 613. 10 is provided with two communication terminals 60, the two communication terminals 60 are red and black terminals of the international standard KNX bus. A command unit 612 and a relay drive unit 613 are connected, and the two control pins of the switch module 40 are connected to the relay drive unit 613. The external control signals include setting a protection current value command and a control switch command. The communication unit 611, After receiving the external control signal, decode it and pass it to the command unit 612. The command unit 612 receives the external command for setting the protection current value, and updates and sets the circuit breaker protection current value in the command unit to this value, realizing the function of remotely setting the current protection value. .

As can be seen from FIG. 1 and FIG. 2 , a programming button 90 is provided on the housing 10 for starting the download control program, and the programming button 90 is connected to the command unit 612 . Touch the programming button 90 to download the application program to the internal instruction unit 612 through the bus.

The housing 10 is provided with a two-position communication connection terminal 60, and the external control bus is connected to the internal communication unit 611 through the communication connection terminal 60 on the housing. The two-position communication connection terminal 60 is KNX The red and black terminals of the bus, while transmitting the control signal, also play the role of supplying power to the internal remote control module. It can work without additional power supply terminals, and the wiring is simple.

It can be seen from Fig. 4 that the communication unit 611 of Embodiment 1 not only completes the communication decoding, but also has two power output pins, wherein the first DC power output pin 616 outputs a 3.3V voltage to supply power to the command unit 612, and the second DC power output Pin 615 outputs a voltage higher than 12V to supply power to the relay drive unit 613. This communication unit 611 has a built-in 2-way DC-DC power supply structure with different voltages, which can provide different DC voltages to supply power to different units while completing communication conversion. The internal structure is simplified, and the integration and reliability are improved.

Embodiment two

Fig. 5 is an axonometric view of the second embodiment, and Fig. 6 is a block diagram of the working principle of the second embodiment.

The working principle of this embodiment is the same as that of Embodiment 1, and the setting module of this embodiment is a button indicator light type.

As can be seen from Figures 5 and 6, on the housing 10, there are setting buttons 801, current value indicator lights 802, 803 and 804, each indicator light corresponds to a set current value, and the corresponding three current values in this embodiment When it is necessary to change the protection current value for 6A, 12A, and 16A, press the setting button 801 continuously, and the current value indicators 802, 803, and 804 will light up in sequence. At any time, only one indicator light is on, and the corresponding current is selected. After the indicator light of the value is on, stop jogging the setting button 801. At this time, the setting signal set by the user will be transmitted to the instruction unit 612, and the instruction unit will extract the protection current value set by the user as the circuit breaker overload value according to the setting signal. The protection current value of the protection is stored.

When remote setting is required, instead of manually jogging the setting button 801, the bus setting protection current value command can be received through the communication terminal 60, and the corresponding current value indicator light 802 can be controlled by sending high and low level commands through the command unit 612. 803 and 804 are turned on, and at the same time, the setting signal is recorded in the command unit 612 as the overload protection current value, thereby realizing the function of remotely setting the overload protection current value.

It can be seen from Fig. 5 and Fig. 6 that a current transformer 50 is arranged under the outlet terminal 31, and the loop passes through the middle of the coil of the current transformer 50. When the line is overloaded, the coil of the current transformer 50 senses the loop current passing through the inside , the two coil output pins of the current transformer 50 output corresponding proportional induction current signals and pass them to the control module. The control module is composed of a communication unit 611, an instruction unit 612, and a relay drive unit 613. The actual current value of the loop delivered.

The instruction unit 612 generates an overload protection control threshold value based on the extracted protection current value according to the preset load type and the protection current value, the control threshold value includes a current threshold value and a time threshold value, and is measured by the current transformer 50 When the current value of the current circuit exceeds the current threshold, the instruction unit 612 starts the preset program and starts timing. The overload time reaches a certain length of time and reaches the overload protection time threshold set by the program. At this time, the command unit 612 outputs a pulse control signal to the relay drive unit 613, the relay drive unit 613 has a built-in power amplifier circuit, and the relay drive unit 613 drives the switch module 40 to change the switch state, thereby changing the incoming terminal The connection or disconnection of the circuit between 30 and the outlet terminal 31 plays the role of line overload protection.

Embodiment Three

Fig. 7 is an axonometric ladder sectional view of the third embodiment, and Fig. 8 is a block diagram of the working principle of the third embodiment.

The working principle of this embodiment is the same as that of Embodiment 1, and the external remote control signal of this embodiment is a wireless type.

The operating part of the setting module 80 is a circular digital dial switch, and the numbers of different current values marked on the housing 10 correspond to the positions of the arrows of the circular digital dial switch. By manually turning the DIP switch, the DIP switch stays in different positions, corresponding to different positions on the housing, and the markings are such as 6A, 10A, 12A, 16A current values, which are used to indicate the set current value. The digital dial switch is connected to the command unit 612, and the command unit 612 can extract the set current value.

The instruction unit 612 generates an overload protection control threshold value based on the extracted protection current value according to the preset load type and the protection current value, the control threshold value includes a current threshold value and a time threshold value, and is measured by the current transformer 50 When the current value of the current circuit exceeds the current threshold, the instruction unit 612 starts the preset program and starts timing. The overload time reaches a certain length of time and reaches the overload protection time threshold set by the program. At this time, the instruction unit 612 outputs a pulse control signal to the relay drive unit 613, the relay drive unit 613 has a built-in power amplifier circuit, and the relay drive unit 613 drives the switch module 40 to change the switch state, thereby changing the incoming line The connection or disconnection of the circuit between the terminal 30 and the outgoing terminal 31 plays a role of line overload protection.

The external power supply is connected to the power supply unit 617 through the power supply terminal 61. After the power supply unit 617 is stepped down and stabilized, it supplies power to the internal command unit 612, the relay drive unit 613, and the communication unit 611. The external remote control signal is wireless The signal is WiFi, Bluetooth, LoRa, 4G, zigbee and other wireless interpretation methods. The external control signal includes setting the protection current value command and controlling the switching command. The communication unit 611 receives the external control signal and transmits it to the Instruction unit 612. The instruction unit 612 receives an external instruction for setting the protection current value, updates and sets the protection current value of the circuit breaker in the instruction unit to this value, and realizes the function of remotely setting the current protection value.

Corresponding to the above embodiments, the present invention also provides a control method of a circuit breaker that can set the protection current value, and this method can be applied to any of the above embodiments, including the following steps:

Obtaining user settings through the setting module;

The setting module transmits the protection current value corresponding to the user setting to the control module;

The control module generates a control threshold according to the preset load type and the protection current value;

Acquiring the current current value between the incoming line terminal and the outgoing line terminal through the current detection module and transmitting it to the control module;

When the current current value and duration exceed the control threshold, the control module controls the switching module to cut off the electrical connection between the incoming line terminal and the outgoing line terminal.

Specifically, refer to FIG. 9 , which is a schematic flowchart of Embodiment 1 of the present invention.

S01, the user sets through the setting module;

S02. Obtain user settings through the setting module, and transmit a protection current value corresponding to the user settings to the control module;

S03, the control module generates a control threshold according to the preset load type and the protection current value;

S04. Obtain the current current value between the incoming line terminal and the outgoing line terminal through the current detection module and transmit it to the control module;

S05, comparing the actual current value of the loop with the overload protection current threshold;

S06, start counting when the threshold is exceeded and compare it with the time threshold;

S07. When the current current value and the duration exceed the control threshold, the control module controls the switch module to cut off the electrical connection between the incoming terminal and the outgoing terminal;

S08, after troubleshooting, manually send a command through the bus or manually operate the manual lever to close the relay.

It should be noted that the above description is a preferred embodiment of the present invention. It should be pointed out that for those skilled in the art, some improvements and modifications can be made without departing from the principle of the present invention. Improvements and modifications are also considered within the protection scope of the present invention. For example, the current detection module uses Hall elements, manganese copper resistors, shunts, and Rogowski coils as current sensors; the communication part selects communication protocols such as RS485, DALI, CAN bus, and power line carrier; the tripping of short circuit protection Some of them are replaced with hydraulic circuit breakers and so on.

These can be understood and implemented by those skilled in the art without creative efforts, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims (9)

1. The utility model provides a can set up protection current value's circuit breaker, includes casing, incoming line terminal, outlet terminal, current detection module, switching module, control module, its characterized in that:

the switching module is connected in series between the incoming line terminal and the outgoing line terminal and is used for cutting off or conducting the electric connection between the incoming line terminal and the outgoing line terminal;

the control module is connected with a setting module, and the setting module is used for receiving user setting and transmitting a setting signal corresponding to the user setting to the control module;

the current detection module is used for acquiring a current value between the incoming line terminal and the outgoing line terminal and transmitting the current value to the control module;

the control module extracts a corresponding protection current value set by the user according to the setting signal, and generates a control threshold value according to a preset load type and the protection current value, wherein the control threshold value comprises a current threshold value and a time threshold value, and when the current value exceeds the current threshold value and the duration of the current value exceeds the time threshold value, the control module controls the switching module to cut off the electric connection between the incoming line terminal and the outgoing line terminal.

2. The circuit breaker capable of setting the protection current value according to claim 1, wherein: the current detection module is a current transformer with a magnetic ring, a loop between the incoming line terminal and the outgoing line terminal penetrates through the magnetic ring of the current transformer, the opening and closing module is a magnetic latching relay with a manual driving lever, an operation hole is formed in the position, corresponding to the manual driving lever, of the shell, and the manual driving lever can be operated outside the shell to enable the magnetic latching relay to be switched off or to be switched on to be electrically connected between the incoming line terminal and the outgoing line terminal.

3. The circuit breaker capable of setting the protection current value according to claim 1, wherein: the operating part of the setting module is exposed on the shell, the shell is correspondingly provided with a current value mark corresponding to the position of the operating part, the setting module points to different current values after being set by a user, and the control module is configured to: the current protection value is associated with a current value corresponding to the mark on the setting module.

4. A circuit breaker capable of setting protection current value according to claim 3, characterized in that: the operation part is a digital dial switch, and the protection current value corresponds to a binary value of the current state of the digital dial switch.

5. A circuit breaker capable of setting protection current value according to claim 3, characterized in that: the operation portion is button and a N pilot lamp, and N is not less than 2 positive integer, pilot lamp and button with control module is connected, and every pilot lamp corresponds the different electric current numerical value sign on the casing, and the point is moved and is pressed the button for light the pilot lamp that corresponds different electric current numerical value position, the corresponding numerical value that the pilot lamp that lights at present of protection current value corresponds.

6. The circuit breaker capable of setting the protection current value according to claim 1, wherein: the control module comprises a communication unit, and an instruction unit and a relay driving unit which are connected with the communication unit, wherein an external remote control signal is transmitted to the instruction unit through the communication unit, and the instruction unit controls the switching-on or switching-off loop of the switching module through the relay driving unit which is connected with the instruction unit.

7. The circuit breaker capable of setting the protection current value according to claim 6, wherein: be provided with a two communication binding post and programming button on the casing, outside control bus passes through communication binding post on the casing and is connected to the communication unit, the communication unit has two DC power supply output pins, and the first DC power supply of an output pin output supplies power for instruction unit, and another output pin output second DC power supply supplies power for relay drive unit, and second DC power supply voltage is higher than first DC power supply voltage, programming button be connected to instruction unit on for download control module application.

8. The circuit breaker capable of setting the protection current value according to claim 6, wherein: the shell is provided with a power supply terminal, the shell is internally provided with a power supply unit, an external power supply is connected to the power supply unit through the power supply terminal, the power supply unit outputs a direct current power supply to supply power to the communication unit, the instruction unit and the relay driving unit, the communication unit is provided with a WiFi, bluetooth and 4G wireless transceiving circuit, an external control instruction is transmitted to the communication unit through wireless, and the control instruction is transmitted to the instruction unit after being decoded by the communication unit.

9. A control method of a circuit breaker capable of setting a protection current value, based on any one of claims 1 to 8, wherein the method comprises the following steps: comprises the following steps:

acquiring a setting signal set by a user through the setting module;

the setting module transmits a protection current value corresponding to the user setting signal to the control module;

the control module generates a control threshold value according to the preset load type and the protection current value;

obtaining the current value between the incoming line terminal and the outgoing line terminal through the current detection module and transmitting the current value to the control module;

and when the current value and the duration time exceed the control threshold value, the control module controls the switching module to cut off the electric connection between the incoming line terminal and the outgoing line terminal.

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