CN102810838B - Line control method, circuit breaker and power equipment - Google Patents

Abstract

Embodiments of the present invention provide a line control method, a circuit breaker and electric equipment, which relate to the field of electronics and can avoid false closing operations under abnormal current conditions. The circuit breaker includes: a breaking module, which is used to disconnect the electrical connection between the circuit breaker and the downstream circuit in the case of overcurrent or short circuit; After the downstream line is disconnected, the circuit breaker and the upstream line are turned on, so that the circuit breaker and the upstream line form a current loop; a monitoring module is used to monitor the magnitude of the current in the current loop; a data transmission module , connected with the monitoring module, used to send the current magnitude in the current loop to the terminal equipment, so that the terminal equipment can close or open the circuit breaker according to the current magnitude in the current loop control. The line control method, circuit breaker and power equipment provided by the embodiments of the present invention are used for remote control of the circuit breaker.

Description

A line control method, circuit breaker and power equipment

technical field

The invention relates to the field of electronics, in particular to a line control method, a circuit breaker and electric equipment.

Background technique

In the construction of base stations, thermal magnetic circuit breakers are widely used. Common thermal magnetic circuit breakers are usually connected in series in the line, and there are two states: closed and open. The closing mechanism will automatically open to protect the circuit.

At present, because some base stations are built in remote areas, the maintenance of equipment is labor-intensive. Therefore, a circuit breaker that realizes remote control by adding a data transmission module and an actuator to an ordinary thermal-magnetic circuit breaker appears. The data transmission module will The state of the circuit breaker is sent to the terminal equipment, and the closing or opening command sent by the terminal equipment is received, and then the actuator controls the breaking and closing mechanism to close or open the circuit breaker according to the closing or opening command. However, after the circuit breaker is disconnected, the operator receives the disconnected state of the circuit breaker at the terminal, and will remotely control the circuit breaker to close. If there is an abnormal current in the line, such as an overload current, closing the circuit breaker will cause the circuit breaker to The downstream circuit or equipment is subjected to overload current impact, causing current or equipment damage. Therefore, in the prior art solution, after the circuit breaker is disconnected, there is a false closing operation in an abnormal current state.

Contents of the invention

Embodiments of the present invention provide a line control method, a circuit breaker and power equipment, which can reduce the occurrence of false closing operations in an abnormal current state after the circuit breaker is disconnected, thereby reducing the risk of equipment damage.

In order to achieve the above object, embodiments of the present invention adopt the following technical solutions:

In one aspect, a circuit breaker is provided, comprising:

The breaking module is used to disconnect the electrical connection between the circuit breaker and the downstream circuit in the case of overcurrent or short circuit, and the circuit breaker also includes:

A conduction module, configured to conduct the circuit breaker and the upstream circuit after the circuit breaker is disconnected from the downstream circuit, so that the circuit breaker and the upstream circuit form a current loop;

A monitoring module, configured to monitor the magnitude of the current in the current loop;

A data transmission module, connected to the monitoring module, configured to send the magnitude of the current in the current loop to the terminal equipment, so that the terminal equipment can close or close the circuit breaker according to the magnitude of the current in the current loop. Disconnect for control.

In a possible implementation manner, the case of the circuit breaker is grounded, and the conduction module is electrically connected to the ground wire on the case of the circuit breaker, and the conduction module is specifically used for: connecting the circuit breaker and After the downstream line is disconnected, the upstream line is electrically connected to the ground wire on the housing of the circuit breaker, so that the circuit breaker and the upstream line form a current loop.

In another possible implementation manner, the data transmission module is further configured to send the open or closed state of the circuit breaker to the terminal equipment after the circuit breaker is connected to the downstream line, so as to facilitate The terminal device controls the closing or opening of the circuit breaker according to the opening or closing state of the circuit breaker.

In another possible implementation manner, the monitoring module is any one of a current detection sensor, a resettable fuse and a current detection circuit.

In another possible implementation manner, the working power of the monitoring module is provided by the current loop where the monitoring module is located; the working power of the data transmission module is provided by the current loop where the data transmission module is located.

In another possible implementation manner, the breaking module includes: a first breaking and closing mechanism and a first actuator, and the first implementing mechanism is connected with the first breaking and closing mechanism for driving the first breaking and closing mechanism. Closing or disconnecting of the breaking and closing mechanism; the conduction module includes: a second breaking and closing mechanism and a second actuator, the second implementing mechanism is connected with the second breaking and closing mechanism for driving the second Closing or opening of the breaking and closing mechanism.

In another aspect, a kind of electric equipment is provided, and the electric equipment includes any one of the above-mentioned circuit breakers, as well as power supply and electric equipment;

The upstream line of the circuit breaker is electrically connected to the power supply, and the downstream line of the circuit breaker is electrically connected to the electrical equipment. When the circuit breaker is closed, current flows from the power supply to the circuit breaker through the circuit breaker. Described electrical equipment.

In another aspect, a line control method is provided, the method comprising:

After the circuit breaker is disconnected from the downstream circuit, the circuit breaker and the upstream circuit are turned on, so that the circuit breaker and the upstream circuit form a current loop; monitor the current in the current loop; The magnitude of the current is sent to the terminal equipment, so that the terminal equipment can control the closing or opening of the circuit breaker according to the magnitude of the current in the current loop.

In a possible implementation manner, the connecting the circuit breaker and the upstream circuit so that the circuit breaker and the upstream circuit form a current loop includes: grounding the casing of the circuit breaker, After the downstream circuit is disconnected, the upstream circuit is electrically connected to the ground wire on the case of the circuit breaker, so that the circuit breaker and the upstream circuit form a current loop.

In another possible implementation manner, the method further includes: after the circuit breaker is connected to the downstream line, sending the open or closed state of the circuit breaker to the terminal equipment, so that the The terminal device controls the closing or opening of the circuit breaker according to the opening or closing state of the circuit breaker.

An embodiment of the present invention provides a line control method, a circuit breaker, and power equipment. The circuit breaker includes: after the circuit breaker is disconnected from the downstream line, the circuit breaker is connected to the upstream line, so that the circuit breaker and the A conduction module that forms a current loop with the upstream line; a monitoring module that monitors the magnitude of the current in the current loop; and a data transmission module that sends the monitored magnitude of the current in the current loop to the terminal device. In this way, after the circuit breaker is disconnected from the downstream circuit, the conduction module conducts the circuit breaker and the upstream circuit, and the monitoring module monitors the current in the current loop, and transmits it to the terminal equipment by the data transmission module, providing the operator The remote control of the circuit breaker provides a basis, so that the operator can make correct judgments according to the magnitude of the current, and can avoid false closing operations under abnormal current conditions.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. Those skilled in the art can also obtain other drawings based on these drawings without creative work.

Fig. 1 is a schematic structural diagram of a circuit breaker provided by an embodiment of the present invention;

Fig. 2 is a schematic structural diagram of another circuit breaker provided by an embodiment of the present invention;

Fig. 3 is a schematic structural diagram of another circuit breaker provided by the embodiment of the present invention;

Fig. 4 is a schematic structural diagram of another circuit breaker provided by an embodiment of the present invention;

Fig. 5 is a line control method provided by an embodiment of the present invention.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

An embodiment of the present invention provides a circuit breaker 10, as shown in FIG. 1 , including:

The breaking module 101 is used for breaking the electrical connection between the circuit breaker 10 and the downstream line X in case of overcurrent or short circuit.

If the circuit breaker 10 works normally, the breaking module 101 is in a closed state.

In practical applications, the breaking module 101 may specifically include: a first breaking and closing mechanism and a first actuator, the first breaking and closing mechanism may be a mechanical switch, the first implementing mechanism may be a device with a driving function, specifically It may be a motor driver, or it may be an electromagnetic control mechanism, or other mechanisms that can drive the opening and closing of the breaking and closing mechanism, which is not limited in the present invention. The first actuator is connected with the first breaking and closing mechanism, and is used for closing or opening the first driving breaking and closing mechanism. Certainly, the breaking module 101 may also be a device integrating a drive and a switch.

The conducting module 102 is configured to conduct the circuit breaker and the upstream circuit Y after the circuit breaker is disconnected from the downstream circuit X, so that the circuit breaker and the upstream circuit form a current loop.

The downstream line is the line connected to the output terminal of the circuit breaker in the power equipment where the circuit breaker is located, and the upstream line is the line connected to the input terminal of the circuit breaker in the power equipment where the circuit breaker is located. , the upstream circuit is usually connected to the power supply of the electric equipment, and the downstream equipment is usually connected to large electrical equipment.

In practical applications, the conduction module 102 specifically includes: a second breaking and closing mechanism and a second actuator, the second breaking and closing mechanism may be a mechanical switch, and the second implementing mechanism may be a device with a driving function, specifically, The motor driver can also be an electromagnetic control mechanism, or other mechanisms that can drive the opening and closing of the breaking and closing mechanism, which is not limited in the present invention. The second actuator is connected with the second breaking and closing mechanism, and is used for driving the closing or opening of the second breaking and closing mechanism. In particular, in the embodiment of the present invention, the first actuator and the second actuator may be realized by the same device. Certainly, the conduction module 102 may also be a device integrating a drive and a switch.

The monitoring module 103 is configured to monitor the magnitude of the current in the current loop.

The data transmission module 104 is connected with the monitoring module 103, and the data transmission module is used to send the magnitude of the current in the current loop to the terminal equipment, so that the terminal equipment can control the current according to the magnitude of the current in the current loop. Closing or opening of the circuit breaker is controlled.

The operator can see the magnitude of the current through the human-computer interaction interface of the terminal equipment, and then make corresponding judgments. In the case of current overload or unstable current, the closing command will not be issued, so as to avoid misoperation under abnormal current status and reduce For damage to related equipment and lines, when the current is small or there is no current, etc., the closing command can be issued, so that the data transmission module receives the closing command and transmits the closing command to the breaking module. The circuit breaker 10 is electrically connected to the downstream line X.

In this way, after the circuit breaker is disconnected from the downstream circuit, the conduction module conducts the circuit breaker and the upstream circuit, and the monitoring module monitors the current in the current loop, and transmits it to the terminal equipment by the data transmission module, providing the operator The remote control of the circuit breaker provides a basis for the operator to make correct judgments based on the magnitude of the current. After the circuit breaker is disconnected, it reduces the occurrence of false closing operations under abnormal current conditions, thereby reducing the risk of equipment damage.

In particular, the above-mentioned first breaking and closing mechanism and the second breaking and closing mechanism can be realized by two mechanical switches, or by one mechanical switch T, and the first actuator and the second actuator can be realized by the same driving device, such as As shown in Fig. 2, in this embodiment, the first actuator and the second actuator are realized by the actuator 106. Further, there are various methods for forming a current loop between the circuit breaker and the upstream circuit, as shown in Fig. 2 As shown, a dedicated wire L can be set to connect the upstream line Y to the line in the circuit breaker that is not connected to the downstream line X to form a current loop S, and there are power sources and loads in the current loop S (not shown in Figure 2 ), the situation of the power supply and load is determined by the specific conditions of the power equipment where the circuit breaker is located, and the present invention does not limit this. The monitoring module 103 is connected in series in the current loop S, monitors the current in the current loop, and sends the monitoring result to the data transmission module 104, and then the data transmission module 104 transmits the monitored current to the terminal equipment.

Exemplarily, in the circuit breaker 10 provided by the embodiment of the present invention, as shown in FIG. After the circuit breaker is disconnected from the downstream circuit X, the upstream circuit Y is electrically connected to the ground wire on the housing M of the circuit breaker, so that the circuit breaker and the upstream circuit form a current loop. In this way, there is a current loop in the circuit breaker 10, and the monitoring module 103 can be connected in series in the current loop to monitor the magnitude of the current in the current loop, and send the monitoring result to the data transmission module 104, and the data transmission module 104 sends The terminal equipment transmits the monitored current. The terminal equipment may be a human-computer interaction device such as a computer, a mobile phone, or a PAD (tablet computer), which is not limited in the present invention. The operator sees the magnitude of the current through the human-computer interaction interface of the terminal equipment, and then makes a corresponding judgment. In the case of current overload or unstable current, the closing command is not issued, so as to avoid misoperation under abnormal current status and reduce damage to the Damage to related equipment and lines, when the current is small or there is no current, etc., the closing command can be issued, so that the data transmission module 104 receives the closing command and transmits the closing command to the breaking module 101, through breaking Module 101 electrically connects circuit breaker 10 to line X downstream. It should be noted that the data transmission module 104 can also transmit the open or closed state of the circuit breaker to the terminal equipment while transmitting the magnitude of the current. Disconnected state, so the state transmission of the circuit breaker can be ignored at this time, and the default is the disconnected state. In particular, the signal indicating the magnitude of the current transmitted by the above-mentioned data transmission module 104 can be a wireless signal or a wired signal, and can be an analog quantity, such as a current analog curve, or a digital quantity, such as an actual current value. No restrictions.

It should be noted that a second data transmission module 105 may also be provided between the breaking and closing mechanism and the downstream line X, as shown in FIG. After conduction, the closed or open state of the circuit breaker is sent to the terminal equipment, so that the terminal equipment can control the closing or opening of the circuit breaker according to the state of the circuit breaker. When the circuit breaker is closed , the upstream line and the downstream line are connected, and the power equipment where the circuit breaker is located can work normally, so the signal sent by the second data transmission module 105 to the terminal equipment indicates that the circuit breaker is in a closed state. When an overcurrent or short circuit occurs in the circuit , the breaking module 101 disconnects the electrical connection between the circuit breaker 10 and the downstream line X, and the signal sent by the second data transmission module 105 to the terminal device indicates that the circuit breaker is in the disconnected state.

As an example, the method of forming a current loop between the circuit breaker and the upstream line can also be shown in Figure 3. In this embodiment, the above-mentioned first breaking and closing mechanism and the second breaking and closing mechanism can be realized by a mechanical switch T, and the first performing The mechanism and the second actuator are realized by the actuator 105. Under normal working conditions, the mechanical switch T is connected to the point a of the downstream line X, and the upstream line Y and the downstream line X are connected. If the circuit breaker is provided with the second data transmission module, the second data transmission module sends a signal indicating that the circuit breaker is in a closed state to the terminal device. When an overcurrent or short circuit occurs, the mechanical switch T disconnects the connection at point a of the downstream circuit X, and at the same time connects with the point b of the circuit where the monitoring module 103 is located, then the upstream circuit Y is connected to the circuit breaker housing The ground wire on M is electrically connected, so that the circuit breaker and the upstream line Y form a current loop, and the monitoring module 103 can monitor the current in the current loop, and send the monitoring result to the data transmission module 104, and the data transmission The module 104 transmits the detected current magnitude to the terminal equipment, and at the same time sends a signal indicating that the circuit breaker is in an open state to the terminal equipment. In particular, if the circuit breaker is provided with a second data transmission module, the above-mentioned action of sending a signal indicating that the circuit breaker is in the disconnected state to the terminal device may also be completed by the second data transmission module. Assuming that the circuit breaker is provided with a second data transmission module, the actuator 105 is connected to both the data transmission module 104 and the second data transmission module, and executes the instructions transmitted by the data transmission module 104 and the second data transmission module to control the mechanical switch T on or off.

Exemplarily, as shown in FIG. 4 , the embodiment of the present invention also provides another circuit breaker 20, wherein in this embodiment, the above-mentioned first breaking and closing mechanism and the second breaking and closing mechanism can be realized by a mechanical switch T, the The first actuator and the second actuator are implemented by the actuator 203. Under normal working conditions, the mechanical switch T is connected to point a of the downstream line X, the upstream line and the downstream line are connected, and the data transmission module 202 is connected between the circuit breaker and the downstream line. After the line X is closed, the state of the circuit breaker is sent to the terminal device, so that the terminal device can control the closing or opening of the circuit breaker according to the state of the circuit breaker. At this time, the data transmission module 202 sends the Signal indicating that the circuit breaker is closed. When an overcurrent or short circuit occurs, the mechanical switch T disconnects the connection at point a of the downstream line X, and at the same time connects with the point b of the line where the monitoring module 201 is located, then the upstream line Y is connected to the circuit breaker housing The ground wire on M is electrically connected, so that the circuit breaker and the upstream circuit Y form a current loop, and the monitoring module 201 can monitor the current in the current loop, and send the monitoring result to the data transmission module 202, and the data transmission The module 202 transmits the detected current magnitude to the terminal equipment, and at the same time sends a signal indicating that the circuit breaker is in an open state to the terminal equipment. The actuator 203 is connected with the data transmission module 202 and executes the instruction transmitted by the data transmission module 202 to control the closing or opening of the mechanical switch T. In particular, in the circuit breaker 20 shown in FIG. 4, the monitoring module 201 has the same function as the monitoring module 103 in FIG. 2, the actuator 203 has the same function as the actuator 106 in FIG. 1 and FIG. The functions of the data transmission module 104 and the second data transmission module 105 are completed, so the number of modules can be reduced and the complexity of circuits in the circuit breaker can be reduced.

Further, the monitoring module described in the embodiment of the present invention is a device capable of monitoring large currents, which may be a current detection sensor, such as a transformer, a shunt, a Hall sensor, etc., or a resettable fuse or a current detection circuit, It can also be a current detection circuit board composed of several devices.

In particular, the working power of the monitoring module can be provided by the current loop where the monitoring module is located. In the embodiment of the present invention, the current in the current loop is usually provided by the power supply of the power device where the circuit breaker is located, so the The working power of the monitoring module is provided by the power supply of the power device where the circuit breaker is located. The working power of the monitoring module can also be provided by the battery carried by the monitoring module itself. The battery can be a disposable battery or can be used in the monitoring The battery that is charged during normal operation of the module.

The working power of the data transmission module can be provided by the current loop where the monitoring module is located. In the embodiment of the present invention, the current in the current loop is usually provided by the power supply of the power device where the circuit breaker is located. Therefore, the data The working power of the transmission module is provided by the power supply of the power device where the circuit breaker is located. The working power of the data transmission module can also be provided by the battery carried by the data transmission module itself. The battery that is charged during normal operation of the data transfer module.

An embodiment of the present invention provides an electric device, including any one of the circuit breakers provided in the embodiments of the present invention, and the electric device further includes: a power source and an electric device. The upstream line of the circuit breaker is electrically connected to the power supply, and the downstream line of the circuit breaker is electrically connected to the electrical equipment. When the circuit breaker is closed, current flows from the power supply to the circuit breaker through the circuit breaker. Described electrical equipment. The electrical equipment may be a base station. The power equipment can be located in a remote area or an area that poses a threat to personal safety, and the terminal equipment can remotely control its circuit breaker.

An embodiment of the present invention provides a line control method, as shown in FIG. 5, the method includes:

501. After the circuit breaker is disconnected from the downstream circuit, turn on the circuit breaker and the upstream circuit, so that the circuit breaker and the upstream circuit form a current loop.

Specifically, after the circuit breaker is disconnected from the downstream line, the casing of the circuit breaker can be grounded, and then the upstream line is electrically connected to the ground wire on the casing of the circuit breaker, so that the circuit breaker and the The upstream line forms a current loop. The downstream line is the line connected to the output end of the circuit breaker in the electric equipment where the circuit breaker is located, and the upstream line is the line connected to the input end of the circuit breaker in the electric equipment where the circuit breaker is located.

502. Monitor the magnitude of the current in the current loop.

503. Send the magnitude of the current in the current loop to the terminal device, so that the terminal device controls closing or opening of the circuit breaker according to the magnitude of the current in the current loop.

In this way, after the circuit breaker is disconnected from the downstream circuit, the circuit breaker is connected to the upstream circuit, and the current in the current loop is monitored and transmitted, which provides a basis for the operator to remotely control the circuit breaker, so that the operator can control the circuit breaker according to Correctly judge the magnitude of the current. After the circuit breaker is disconnected, it can reduce the occurrence of false closing operations under abnormal current conditions, thereby reducing the risk of equipment damage. .

Further, after the circuit breaker is connected to the downstream line, the open or closed state of the circuit breaker is sent to the terminal equipment, so that the terminal equipment can open the circuit breaker according to the open or closed state of the circuit breaker. The closing or opening of the device is controlled.

Those skilled in the art can clearly understand that for the convenience and brevity of the description, the specific steps of the method described above can refer to the corresponding process in the foregoing embodiment of the circuit breaker device, which will not be repeated here.

In the several embodiments provided in this application, it should be understood that the disclosed devices and methods may be implemented in other ways. For example, the device embodiments described above are only illustrative. For example, the division of the modules is only a logical function division. In actual implementation, there may be other division methods. For example, multiple modules or components can be combined or May be integrated into another system, or some features may be ignored, or not implemented. In another point, the mutual coupling or direct coupling or communication connection shown or discussed may be through some interfaces, and the indirect coupling or communication connection of devices or modules may be in electrical, mechanical or other forms.

The modules described as separate components may or may not be physically separated, and the components displayed as modules may or may not be physical modules, that is, they may be located in one place, or may be distributed to multiple network modules. Part or all of the modules can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

In addition, each functional module in each embodiment of the present invention can be integrated into one processing module, or each module can be physically included separately, or two or more modules can be integrated into one module. The above-mentioned integrated modules can be implemented in the form of hardware, or in the form of hardware plus software function modules.

Those of ordinary skill in the art can understand that all or part of the steps for realizing the above-mentioned method embodiments can be completed by hardware related to program instructions, and the aforementioned program can be stored in a computer-readable storage medium. When the program is executed, the It includes the steps of the above method embodiments; and the aforementioned storage medium includes: ROM, RAM, magnetic disk or optical disk and other various media that can store program codes.

The above is only a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Anyone skilled in the art can easily think of changes or substitutions within the technical scope disclosed in the present invention. Should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be determined by the protection scope of the claims.

Claims (8)

1. A circuit breaker, comprising: a breaking module, for disconnecting the electrical connection between the circuit breaker and the downstream circuit under the condition of overcurrent or short circuit, characterized in that, the circuit breaker also includes: A conduction module, configured to conduct the circuit breaker and the upstream circuit after the circuit breaker is disconnected from the downstream circuit, so that the circuit breaker and the upstream circuit form a current loop; A monitoring module, configured to monitor the magnitude of the current in the current loop; A data transmission module, connected to the monitoring module, configured to send the magnitude of the current in the current loop to the terminal equipment, so that the terminal equipment can close or close the circuit breaker according to the magnitude of the current in the current loop. Disconnect for control; The casing of the circuit breaker is grounded, the conducting module is electrically connected to the ground wire on the casing of the circuit breaker, and the conducting module is specifically used for: after the circuit breaker is disconnected from the downstream line, the The upstream circuit is electrically connected to the ground wire on the housing of the circuit breaker, so that the circuit breaker and the upstream circuit form a current loop. 2. The circuit breaker according to claim 1, wherein the data transmission module is further configured to transmit the open or closed state of the circuit breaker after the circuit breaker is connected to the downstream line to the terminal equipment, so that the terminal equipment controls the closing or opening of the circuit breaker according to the opening or closing state of the circuit breaker. 3. The circuit breaker according to claim 2, wherein the monitoring module is any one of a current detection sensor, a resettable fuse and a current detection circuit. 4. The circuit breaker of claim 3, wherein: The working power of the monitoring module is provided by the current loop where the monitoring module is located; The working power of the data transmission module is provided by the current loop where the data transmission module is located. 5. The circuit breaker of claim 4, wherein: The breaking module includes: a first breaking and closing mechanism and a first actuator, the first implementing mechanism is connected with the first breaking and closing mechanism, and is used to drive the closing or opening of the first breaking and closing mechanism; The conduction module includes: a second breaking and closing mechanism and a second actuator, and the second implementing mechanism is connected with the second breaking and closing mechanism for driving the closing or opening of the second breaking and closing mechanism. 6. A kind of electric equipment, it is characterized in that, described electric equipment comprises: Power supply, electrical equipment, and the circuit breaker described in any one of claims 1 to 5; The upstream line of the circuit breaker is electrically connected to the power supply, and the downstream line of the circuit breaker is electrically connected to the electrical equipment. When the circuit breaker is closed, current flows from the power supply to the circuit breaker through the circuit breaker. Described electrical equipment. 7. A line control method, characterized in that the method comprises: After the circuit breaker is disconnected from the downstream circuit, the circuit breaker and the upstream circuit are turned on, so that the circuit breaker and the upstream circuit form a current loop; monitoring the magnitude of the current in the current loop; Sending the magnitude of the current in the current loop to the terminal equipment, so that the terminal equipment can control the closing or opening of the circuit breaker according to the magnitude of the current in the current loop; The turning on the circuit breaker and the upstream line so that the circuit breaker and the upstream line form a current loop includes: Grounding the casing of the circuit breaker, after the circuit breaker is disconnected from the downstream circuit, electrically connecting the upstream circuit to the ground wire on the circuit breaker casing, so that the circuit breaker and the upstream circuit form a current loop. 8. The method according to claim 7, further comprising: after the circuit breaker is connected to the downstream line, sending the open or closed state of the circuit breaker to the terminal equipment , so that the terminal device controls the closing or opening of the circuit breaker according to the opening or closing state of the circuit breaker.