Method and system for monitoring control operation state of alternating current contactor of distribution box

Abstract

The invention discloses a method and system for monitoring the control operation state of an alternating current contactor of a distribution box. The system comprises the distribution box, a zero-crossing voltage signal generation circuit, a dial switch, a single chip microcomputer, a relay and a wireless communication module. By configuring the zero-crossing voltage signal generation circuit and the dial switch, comprehensive monitoring of the input voltage of the distribution box and the control state, the operation state, the fault state and the idle state of the alternating current contactor is realized, the fault state and the idle state of the alternating current contactor can be accurately judged and fed back to a management platform in time, and the management efficiency is improved. Management personnel can master the operation state of the distribution box in real time through the management platform, the frequency of field checking is reduced, the management and operation and maintenance cost is reduced, the intelligent level of the distribution box is improved, the system adapts to the trend of smart city construction and Internet of Things development, and the operation reliability and management efficiency of the distribution box are improved. In addition, the overall structure is simple, cost is low, construction is easy, and functions are comprehensive.

Description

Technical Field

[0001] The present invention relates to the technical field of distribution boxes, and particularly relates to a method for monitoring the control operation state of an AC contactor in a distribution box. Background Art

[0002] Municipal low-voltage power distribution is related to everyone in urban life. The stable operation of municipal distribution boxes and their circuits is a key link in the stable operation of the city. Before the intelligent transformation, the municipal distribution boxes achieved unmanned automatic control through time-controlled switches. Whether the automatic control operation is achieved according to the setting still requires maintenance personnel to go to the site to check. Now, the Internet of Things has entered all fields of society. The proposal of the construction of a smart city is in line with such a technological development trend, and traditional distribution boxes are also undergoing intelligent transformation.

[0003] At present, the intelligent control part in intelligent distribution boxes mainly consists of a management platform, an intelligent distribution box controller, a wireless communication network, and an AC contactor in an intelligent low-voltage distribution box. Among them, the intelligent distribution box controller includes a wireless communication module, a single-chip microcomputer, and a relay circuit. There are two situations in the monitoring of the operation state of the distribution box and its circuit. One is that there is no configuration of the electrical parameter measurement part, so there is no monitoring of the operation state of the distribution box and its circuit. The other is that there is a configuration of the electrical parameter measurement part, so there is monitoring of the operation state of the distribution box and its circuit.

[0004] For the situation where there is no configuration of the electrical parameter measurement part, the management personnel cannot monitor the execution of instructions in real time, cannot monitor the operation of the distribution box and its circuit in real time, and there is basically no difference from the traditional distribution box controlled by the time-controlled switch, and the management and operation and maintenance costs cannot be reduced.

[0005] For the situation where there is a configuration of the electrical parameter measurement part, although the voltage of the municipal power grid can be monitored through the voltage transformer at the input end, and the execution of the instruction and the operation of the distribution box and its circuit can be monitored through the current transformer at the output end, when the current transformer monitors that the current is zero, it is impossible to determine whether it is due to a fault of the AC contactor or a circuit break fault. Moreover, sampling this technical solution to transform the foregoing situation will increase a lot of construction and material costs, especially for those projects where the number of AC contactors in the distribution box is inconsistent, but the total number of AC contactors is large and only control is required without electrical parameter measurement, which will additionally increase a lot of unnecessary costs. Summary of the Invention

[0006] Aiming at the above deficiencies, the purpose of the present invention is to provide a method and system for monitoring the control operation state of an AC contactor in a distribution box, which are simple in structure and easy to implement.

[0007] The technical solution provided by the present invention to achieve the above purpose is:

[0008] A method for monitoring the control operation status of an AC contactor in a distribution box, which includes the following steps:

[0009] Monitoring the input voltage of the distribution box: Using a zero-crossing voltage signal generation circuit to monitor the input voltage of the distribution box at the input end, judging whether the mains power grid is supplying power normally by the change of the output level, and sending a power-off signal to the platform when the power is off;

[0010] Monitoring the control status of the AC contactor: The single-chip microcomputer controls the relay to act, and judges whether the closing or opening of the AC contactor is successful according to the change of the level of the zero-crossing voltage signal generation circuit, and sends corresponding information to the management platform;

[0011] Monitoring the operating status of the AC contactor: Judging whether the operating status of the AC contactor is normal after closing or opening according to the output level of the zero-crossing voltage signal generation circuit and the level status of the corresponding circuit;

[0012] Monitoring the fault status of the AC contactor: During closing, opening or operation, if an abnormal change in the level is detected and lasts for a period of time, it is judged that the AC contactor has a fault and a fault message is sent to the management platform;

[0013] Monitoring the idle status of the AC contactor: Pull down the input level of the zero-crossing voltage signal generation circuit of the corresponding circuit through the DIP switch. After the single-chip microcomputer detects the low level, it judges that the AC contactor of this circuit is idle and sends an idle message to the management platform.

[0014] As a preferred solution of the invention, in the monitoring of the input voltage of the distribution box, it is defined that one of the zero-crossing voltage signal generation circuits is used to monitor the input voltage of the distribution box at the input end. The defined one of the zero-crossing voltage signal generation circuits continuously outputs high and low levels to the single-chip microcomputer. When the single-chip microcomputer detects the continuous high and low levels, it judges that the mains power grid is powered on and the input end is normal; when the mains power grid is powered off and there is no voltage input at the input end of the distribution box, the defined one of the zero-crossing voltage signal generation circuits outputs a continuous high level to the single-chip microcomputer. When the single-chip microcomputer detects the continuous high level within a certain period of time, the single-chip microcomputer judges that the mains power grid is powered off and there is no voltage input at the input end of the distribution box. The single-chip microcomputer immediately sends a signal of the mains power grid power-off to the management platform to achieve the purpose of monitoring the fault status of the mains voltage power supply.

[0015] As a preferred solution of the invention, in the monitoring of the control status of the AC contactor, when the AC contactor closes, the single-chip microcomputer issues a control signal, the relay executes the command, the suction contact connects the coil power supply of the AC contactor, and the AC contactor closes. At this time, the zero-crossing voltage signal generation circuit changes from a continuous high level to a continuous high and low level. When the single-chip microcomputer detects the continuous high and low levels, it judges that the AC contactor closes successfully, and then sends a message of the successful closing of the AC contactor to the management platform, completing the complete control status monitoring from the management platform to the power supply loop end.

[0016] As a preferred embodiment of the invention, in the monitoring of the operating state of the AC contactor, after the AC contactor is normally closed, the corresponding zero-crossing voltage signal generating circuit continuously outputs high and low levels. At the same time, it is defined that one of the zero-crossing voltage signal generating circuits continuously outputs high and low levels to the single-chip microcomputer, and the single-chip microcomputer determines that the closing operation state of the AC contactor is normal;

[0017] After the AC contactor is normally opened, the corresponding zero-crossing voltage signal generating circuit continuously outputs a high level to the single-chip microcomputer. At the same time, it is defined that one of the zero-crossing voltage signal generating circuits continuously outputs high and low levels to the single-chip microcomputer, and the single-chip microcomputer determines that the opening operation state of the AC contactor is normal.

[0018] As a preferred embodiment of the invention, in the monitoring of the fault state of the AC contactor, when a closing fault occurs in one of the AC contactors, the single-chip microcomputer detects that one of the defined zero-crossing voltage signal generating circuits continuously outputs high and low levels. After determining that the input of the distribution box is normal, it sends a closing signal. Then, the zero-crossing voltage signal generating circuit corresponding to one of the AC contactors changes from a continuous high level to a continuous high and low level. When the single-chip microcomputer fails to detect a change in the output level of the corresponding zero-crossing voltage signal generating circuit and after a certain period of time, it is determined that one of the AC contactors cannot be closed. Subsequently, the single-chip microcomputer sends a closing fault message of one of the AC contactors to the management platform;

[0019] When an opening fault occurs in one of the AC contactors, the single-chip microcomputer detects that one of the defined zero-crossing voltage signal generating circuits continuously outputs high and low levels. After determining that the input of the distribution box is normal, it sends an opening signal. Then, the zero-crossing voltage signal generating circuit corresponding to one of the AC contactors changes from a continuous high level to a continuous high level. When the single-chip microcomputer fails to detect a change in the output level of the corresponding zero-crossing voltage signal generating circuit and after a certain period of time, it is determined that one of the AC contactors cannot be opened. Subsequently, the single-chip microcomputer sends an opening fault message of one of the AC contactors to the management platform;

[0020] When a fault occurs during the operation of one of the AC contactors, when one of the AC contactors operates normally after closing, the single-chip microcomputer does not send an opening instruction, but the single-chip microcomputer detects that one of the defined zero-crossing voltage signal generating circuits continuously outputs high and low levels, and one of the zero-crossing voltage signal generating circuits changes from continuously outputting high and low levels to continuously outputting a high level. The single-chip microcomputer determines that one of the AC contactors has a fault. Subsequently, the single-chip microcomputer sends a fault message of one of the AC contactors to the management platform;

[0021] When a certain AC contactor is in normal operation after tripping, the single-chip microcomputer does not issue a closing command, but the single-chip microcomputer detects that the defined zero-crossing voltage signal generation circuit of one of the paths continuously outputs high and low levels, and the zero-crossing voltage signal generation circuit of one of the paths changes from continuously outputting a high level to continuously outputting high and low levels, then the single-chip microcomputer determines that a certain AC contactor is faulty, and then the single-chip microcomputer sends the fault information of a certain AC contactor to the management platform.

[0022] As a preferred embodiment of the invention, in the monitoring of the idle state of the AC contactor, when one or several AC contactors in the distribution box are idle, the corresponding sequence switches of the DIP switches are turned on, and the signal voltages input to the single-chip microcomputer of the zero-crossing voltage signal generation circuits of the corresponding one or several paths are pulled down to 0. When the single-chip microcomputer detects that the level voltages of the zero-crossing voltage signal generation circuits of one or several paths of the lines are 0, it is determined that the corresponding AC contactors are idle, and then the information that one or several AC contactors are idle is sent to the management platform, achieving the purpose of monitoring the idle state of the AC contactor.

[0023] As a preferred embodiment of the invention, the zero-crossing voltage signal generation circuit includes a fuse, a rectifier diode, an optocoupler, a protection diode, a pull-up resistor, a current-limiting resistor, and a light-emitting diode. The fuse, the rectifier diode, and the current-limiting resistor are connected in series in sequence and are connected to the anode terminal of the optocoupler. The positive electrode of the protection diode is connected to the cathode terminal of the optocoupler, and the negative electrode of the protection diode is connected to the anode terminal of the optocoupler. The pull-up resistor is connected to the collector terminal of the optocoupler, and the light-emitting diode is connected in parallel between the collector terminal and the emitter terminal of the optocoupler.

[0024] A system for a method of monitoring the control operation state of an AC contactor in a distribution box, which includes a distribution box, a zero-crossing voltage signal generation circuit, a DIP switch, a single-chip microcomputer, a relay, and a wireless communication module. The zero-crossing voltage signal generation circuit is configured in multiple paths, one of which is used to monitor the voltage at the input end of the distribution box, and the remaining paths respectively correspond to the outputs of each AC contactor; the DIP switch is connected to the zero-crossing voltage signal generation circuit; the single-chip microcomputer is connected to the zero-crossing voltage signal generation circuit and is used to judge various states of the distribution box and the AC contactor according to the input level signals; the relay is used to execute the commands of the single-chip microcomputer and control the closing and tripping of each AC contactor; the wireless communication module is used to interact with the management platform, receive the instructions issued by the management platform and transmit them to the single-chip microcomputer for execution, and send back the information fed back after the single-chip microcomputer executes the instructions to the management platform.

[0025] As a preferred embodiment of the invention, the distribution box has a three-phase input at the input end, the multi-way AC contactor is an 8-way AC contactor, all the AC contactors share the three-phase input, and each AC contactor branches out its own three-phase output. The zero-crossing voltage generation circuit is connected to any one of the three-phase inputs; the access phase of the zero-crossing voltage generation circuit can be flexibly selected according to the specific wiring situation and usage requirements of the distribution box, improving the applicable range of the system; a hook is provided on the distribution box, facilitating the on-site installation and use of the distribution box. The DIP switch is arranged on the outer surface of the distribution box, enabling the operator to conveniently operate, and the DIP switch can be adjusted without opening the distribution box or performing complex disassembly work, improving the usability of the system.

[0026] The beneficial effects of the present invention are as follows: By configuring the zero-crossing voltage signal generation circuit and the DIP switch, the present invention realizes the comprehensive monitoring of the input voltage of the distribution box, the control state, operation state, fault state, and idle state of the AC contactor, can accurately judge the fault state and idle state of the AC contactor, and timely feedback to the management platform, enabling the management personnel to real-time grasp the operation state of the distribution box through the management platform, reducing the frequency of on-site inspections, lowering the management and operation and maintenance costs, improving the intelligent level of the distribution box, adapting to the trend of smart city construction and the development of the Internet of Things, and improving the operation reliability and management efficiency of the distribution box. In addition, the overall structure is simple, with the advantages of low cost, simple construction, and comprehensive functions, and can effectively reduce the management and operation and maintenance costs of the distribution box. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the principle of the present invention.

[0028] Figure 2 It is a schematic diagram of the single-chip microcomputer and its peripheral circuits in the present invention.

[0029] Figure 3 It is a schematic diagram of the zero-crossing voltage signal generation circuit in the present invention.

[0030] Figure 4 It is a schematic diagram of the structure of the distribution box in the present invention.

[0031] Figure 5 It is a normal flowchart for monitoring the input voltage of the distribution box in the present invention.

[0032] Figure 6 It is a flowchart for monitoring the power-off of the input voltage of the distribution box in the present invention.

[0033] Figure 7 It is a flowchart for monitoring the control state of the AC contactor in the present invention.

[0034] Figure 8It is the flowchart for monitoring the operating state of the AC contactor of the present invention.

[0035] Figure 9 It is the flowchart for monitoring the fault state of the AC contactor of the present invention.

[0036] Figure 10 It is the flowchart for monitoring the closing and opening fault states of the AC contactor of the present invention.

[0037] Figure 11 It is the flowchart for monitoring the fault state during the operation of the AC contactor of the present invention.

[0038] Figure 12 It is the flowchart for monitoring the idle state of the AC contactor of the present invention. Detailed implementation manners

[0039] Example: Refer to Figures 1 to 12 , a method and system for monitoring the control operating state of an AC contactor for a distribution box provided by an embodiment of the present invention. The system includes a distribution box 1, a zero-crossing voltage signal generation circuit, a DIP switch 2, a single-chip microcomputer, a relay, and a wireless communication module. The single-chip microcomputer preferably uses a single-chip microcomputer of model GD32F303VET6.

[0040] The zero-crossing voltage signal generation circuit is used to configure multiple channels, one of which is used to monitor the voltage at the input end of the distribution box, and the remaining channels respectively correspond to the outputs of each AC contactor; the DIP switch 2 is connected to the zero-crossing voltage signal generation circuit; the single-chip microcomputer is connected to the zero-crossing voltage signal generation circuit and is used to judge various states of the distribution box and the AC contactor according to the input level signal; the relay is used to execute the commands of the single-chip microcomputer to control the closing and opening of each AC contactor; the wireless communication module is used to interact with the management platform, receive the instructions issued by the management platform and transmit them to the single-chip microcomputer for execution, and send the information fed back after the single-chip microcomputer executes the instructions back to the management platform. Preferably, a hook 3 is provided on the distribution box 1, which provides convenience for the on-site installation and use of the distribution box. The DIP switch 2 is arranged on the outer surface of the distribution box 1. This enables the operator to operate conveniently, and the DIP switch can be adjusted without opening the distribution box or performing complex disassembly work, improving the usability of the system.

[0041] Refer to Figure 3, the zero-crossing voltage signal generation circuit includes a fuse, a rectifier diode, an optocoupler, a protection diode, a pull-up resistor, a current-limiting resistor, and a light-emitting diode. The fuse, the rectifier diode, and the current-limiting resistor are connected in series in sequence and are connected to the anode terminal of the optocoupler. The positive electrode of the protection diode is connected to the cathode terminal of the optocoupler, and the negative electrode of the protection diode is connected to the anode terminal of the optocoupler. The pull-up resistor is connected to the collector terminal of the optocoupler, and the light-emitting diode is connected in parallel between the collector terminal and the emitter terminal of the optocoupler.

[0042] Taking the input of the distribution box as three-phase electricity and selecting 8-way AC contactors as an example for illustration. All AC contactors share the three-phase input, and each AC contactor branches out its own three-phase output. Three states of the zero-crossing voltage signal generation circuit are defined: high level, high-low level, and low level. When the zero-crossing voltage signal generation circuit outputs a high level, it is a fault state; when it outputs a high-low level with a frequency of 50Hz, it is a normal state; when the dip switch makes it output a low level, the AC contactor or the loop is in an idle state. By introducing a third state to the zero-crossing voltage signal generation circuit through the dip switch, it solves the problem that the zero-crossing voltage signal generation current has only two signal states, high level and high-low level, and it is impossible to judge the idle state when a certain AC contactor in the distribution box is no longer in use. The circuit design and implementation of monitoring the input and output states and fault monitoring of the distribution box are realized by repeatedly using a single zero-crossing voltage signal generation circuit.

[0043] This system has a total of 9 zero-crossing voltage signal generation circuits. Among them, the 9th zero-crossing voltage signal generation circuit is used for monitoring the input terminal shared by the AC contactors and can be connected to any one of the three-phase inputs L1, L2, and L3. The 1st zero-crossing voltage signal generation circuit is connected to the output of the 1st AC contactor defined in the distribution box. Generally, counting from left to right, the leftmost is the 1st road, and the rightmost is the 8th road. Its wiring is consistent with the input connection. For example, if the input terminal is connected to the L1 phase, then the output terminal is connected to the branched L1 phase. The 2nd to 8th roads are the same by analogy. Connecting the neutral line to the neutral line busbar completes the wiring. If one or several of the 1st to 8th AC contactors are not used, just turn on the corresponding numbered switch on the dip switch.

[0044] Monitoring the input voltage of the distribution box: Using the zero-crossing voltage signal generation circuit to monitor the input voltage of the distribution box, judging whether the power grid of the commercial power is normally powered by the change of the output level, and sending a power-off signal to the platform when the power is off; specifically, see Figure 5 , it is defined that the 9th zero-crossing voltage signal generation circuit is used for monitoring the input voltage of the distribution box. This circuit always outputs a high-low level to the single-chip microcomputer. If the single-chip microcomputer detects a continuous high-low level, it judges that the power grid of the commercial power is powered and the input terminal is normal.

[0045] When the power grid of the commercial power is powered off, see Figure 6When there is no voltage input at the input end of the distribution box, the 9th zero-crossing signal generator circuit outputs a continuous high level to the single-chip microcomputer. The single-chip microcomputer detects the continuous high level within a certain period of time and determines that the mains power grid has lost power and there is no voltage input at the input end of the distribution box. The single-chip microcomputer immediately sends a signal indicating that the mains power grid has lost power to the platform, achieving the purpose of monitoring the fault state of the mains voltage power supply. Only when the input of the distribution box is normal, that is, when the 9th zero-crossing voltage signal generating circuit gives the single-chip microcomputer continuous high and low levels, all the following state monitoring is valid.

[0046] Monitoring of the control state of the AC contactor: Refer to Figure 7 The single-chip microcomputer controls the relay to act, and judges whether the closing or opening of the AC contactor is successful according to the level change of the zero-crossing voltage signal generating circuit, and sends corresponding information to the management platform. Specifically, taking the control of the 1st AC contactor as an example. When the 1st AC contactor closes, the single-chip microcomputer sends a control signal, the relay executes the command, the contact is closed, the coil of the AC contactor is powered, and the AC contactor closes. At this time, the 1st zero-crossing voltage signal generating circuit changes from continuous high level to continuous high and low levels. The single-chip microcomputer detects the continuous high and low levels and judges that the closing of the 1st AC contactor is successful, and then sends a message indicating the successful closing of the 1st AC contactor to the management platform. The management platform obtains the information and generates a log message. When opening the gate, the single-chip microcomputer sends a control signal, the relay executes the command, the contact is disconnected, the coil of the 1st AC contactor is powered off, and the 1st AC contactor opens. At this time, the 1st zero-crossing voltage signal generating circuit changes from continuously outputting high and low levels to continuously outputting high level. The single-chip microcomputer detects the continuously output high level and judges that the opening of the 1st AC contactor is successful, and then sends a message indicating the successful opening of the 1st AC contactor to the management platform. The management platform obtains the information and generates a log message. In this way, the complete control state monitoring from the management platform to the power supply loop end is completed. The same applies to the other AC contactors.

[0047] Monitoring of the operating state of the AC contactor: Refer to Figure 8 According to the output level of the zero-crossing voltage signal generating circuit and the level state of the corresponding circuit, judge whether the operating state of the AC contactor is normal after closing or opening;

[0048] Specifically, the control of the 1st AC contactor is taken as an example. After the 1st AC contactor is closed normally, the 1st zero voltage signal generating circuit will continue to output high and low levels, and at the same time, the 9th zero voltage signal generating circuit will continue to output high and low levels to the single-chip microcomputer, and the single-chip microcomputer determines that the closing operation state of the AC contactor is normal. Similarly, after the 1st AC contactor is opened normally, the 1st zero voltage signal generating circuit will continue to output high levels to the single-chip microcomputer, and at the same time, the 9th zero voltage signal generating circuit will continue to output high and low levels to the single-chip microcomputer, and the single-chip microcomputer determines that the opening operation state of the 1st AC contactor is normal. The same applies to the other AC contactors.

[0049] AC contactor fault status monitoring: see Figure 9 , Figure 10 and Figure 11 During closing, opening or operation, if an abnormal level change is detected and lasts for a period of time, it is determined that the AC contactor is faulty and the fault information is sent to the management platform; specifically, the control of the first AC contactor is taken as an example.

[0050] ① In case of AC contactor closing failure, the MCU detects that the 9th voltage zero-crossing voltage signal generating circuit continuously outputs high and low levels, and sends out a closing signal after judging that the input of the distribution box is normal. After that, the 1st zero-crossing voltage signal generating circuit should change from a continuous high level to a continuous high and low level. When the MCU fails to detect that the output level of the 1st zero-crossing voltage signal generating circuit changes and lasts for a period of time, it judges that the 1st AC contactor cannot be closed, and then the MCU sends the 1st AC contactor closing failure information to the management platform.

[0051] ② In the event of an AC contactor tripping failure, the MCU detects that the 9th voltage zero-crossing voltage signal generating circuit continuously outputs high and low levels, and determines that the input of the distribution box is normal, and then sends out a tripping signal. After that, the 1st zero-crossing voltage signal generating circuit should change from continuous high and low levels to continuous high levels. When the MCU fails to detect that the output level of the 1st zero-crossing voltage signal generating circuit changes and lasts for a period of time, it determines that the 1st AC contactor cannot be opened, and then the MCU sends the 1st AC contactor tripping failure information to the management platform.

[0052] ③ The AC contactor fails during operation. When the No. 1 AC contactor is closed and operates normally, the microcontroller does not issue an opening command, but the microcontroller detects that the No. 9 zero-voltage signal generating circuit continuously outputs high and low levels, while the No. 1 zero-voltage signal generating circuit changes from continuously outputting high and low levels to continuously outputting high levels. The microcontroller determines that the No. 1 AC contactor is faulty, and then the microcontroller sends the No. 1 AC contactor fault information to the management platform.

[0053] Similarly, when the first AC contactor is in normal operation after opening, the single-chip microcomputer does not issue a closing command. However, the single-chip microcomputer detects that the ninth zero-crossing voltage signal generating circuit continuously outputs high and low levels, while the first zero-crossing voltage signal generating circuit changes from continuously outputting a high level to continuously outputting high and low levels. The single-chip microcomputer determines that the first AC contactor is faulty, and then the single-chip microcomputer sends the fault information of the first AC contactor to the management platform. The same applies to the other AC contactors.

[0054] Idle state monitoring of AC contactor: Refer to Figure 12 , and the input level of the zero-crossing voltage signal generating circuit of the corresponding circuit is pulled low through the DIP switch. After detecting the low level, the single-chip microcomputer determines that the AC contactor of this circuit is idle and sends the idle information to the management platform. Specifically, when one or several AC contactors in the distribution box are idle, turn on the corresponding numbered switch of the DIP switch. The DIP switch pulls the signal voltage input from the zero-crossing voltage signal generating circuit to the single-chip microcomputer down to 0. The single-chip microcomputer detects that the level voltage of the zero-crossing voltage signal generating circuit of this circuit is 0, determines that the AC contactor of this circuit is idle, and then sends a message to the management platform to achieve the purpose of monitoring the idle state of the AC contactor.

[0055] According to the disclosure and teaching of the above specification, those skilled in the art of the present invention can also make changes and modifications to the above embodiments. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and some modifications and changes to the present invention should also fall within the protection scope of the claims of the present invention. In addition, although some specific terms are used in this specification, these terms are only for convenience of description and do not constitute any limitation to the present invention. As described in the above embodiments of the present invention, the use of the same or similar methods and systems is within the protection scope of the present invention.

Claims

1. A method for monitoring the control operation status of an AC contactor in a distribution box, characterized in that, It includes the following steps: Power distribution box input voltage monitoring: Use a zero-crossing voltage signal generation circuit to monitor the voltage at the input of the power distribution box. Determine whether the main power grid is supplying power normally by judging the change in the output level, and send a power-off signal to the platform when power is lost; AC contactor control status monitoring: The single-chip microcomputer controls the relay to act. Judge whether the closing or opening of the AC contactor is successful according to the change in the level of the zero-crossing voltage signal generation circuit, and send corresponding information to the management platform; AC contactor operating status monitoring: Judge whether the operating status of the AC contactor is normal after closing or opening according to the output level of the zero-crossing voltage signal generation circuit and the level status of the corresponding circuit; AC contactor fault status monitoring: During closing, opening, or operation, if an abnormal change in the level is detected and lasts for a period of time, judge that the AC contactor has a fault and send a fault message to the management platform; AC contactor idle status monitoring: Pull down the input level of the zero-crossing voltage signal generation circuit corresponding to the road through the DIP switch. After the single-chip microcomputer detects the low level, judge that the AC contactor of this road is idle and send an idle message to the management platform.

2. The method for monitoring the control operation state of the AC contactor in the distribution box according to claim 1, wherein In the power distribution box input voltage monitoring, define one of the zero-crossing voltage signal generation circuits to monitor the voltage at the input of the power distribution box. The defined one of the zero-crossing voltage signal generation circuits continuously outputs high and low levels to the single-chip microcomputer. When the single-chip microcomputer detects continuous high and low levels, it judges that the main power grid is powered on and the input end is normal; when the main power grid loses power and there is no voltage input at the input of the power distribution box, the defined one of the zero-crossing voltage signal generation circuits outputs a continuous high level to the single-chip microcomputer. When the single-chip microcomputer detects continuous high level within a certain period of time, the single-chip microcomputer judges that the main power grid has lost power and there is no voltage input at the input of the power distribution box, and the single-chip microcomputer immediately sends a signal of the main power grid losing power to the management platform.

3. The method for monitoring the control operation state of the AC contactor in the distribution box according to claim 2, characterized in that, In the AC contactor control status monitoring, when the AC contactor closes, the single-chip microcomputer issues a control signal, the relay executes the command, the suction contact connects the power supply of the coil of the AC contactor, and the AC contactor closes. At this time, the zero-crossing voltage signal generation circuit changes from continuous high level to continuous high and low levels. When the single-chip microcomputer detects continuous high and low levels, it judges that the AC contactor closes successfully, and then sends a message of the AC contactor closing successfully to the management platform.

4. The method for monitoring the control operation state of the AC contactor in the distribution box according to claim 2, wherein, In the AC contactor operating status monitoring, after the AC contactor closes normally, the corresponding zero-crossing voltage signal generation circuit continuously outputs high and low levels. At the same time, the defined one of the zero-crossing voltage signal generation circuits continuously outputs high and low levels to the single-chip microcomputer, and the single-chip microcomputer judges that the closing operating status of the AC contactor is normal; After the AC contactor opens normally, the corresponding zero-crossing voltage signal generation circuit continuously outputs a high level to the single-chip microcomputer. At the same time, the defined one of the zero-crossing voltage signal generation circuits continuously outputs high and low levels to the single-chip microcomputer, and the single-chip microcomputer judges that the opening operating status of the AC contactor is normal.

5. The method for monitoring the control operation state of the AC contactor in the distribution box according to claim 4, characterized in that, In the monitoring of the fault state of AC contactors, when there is a closing fault in a certain path of the AC contactor, the single-chip microcomputer detects that the defined zero-crossing voltage signal generation circuit in one path continuously outputs high and low levels. After judging that the input of the distribution box is normal, it sends a closing signal. Then, the zero-crossing voltage signal generation circuit corresponding to a certain path of the AC contactor changes from continuous high level to continuous high and low levels. When the single-chip microcomputer fails to detect a change in the output level of the corresponding zero-crossing voltage signal generation circuit and this lasts for a period of time, it is judged that a certain path of the AC contactor cannot be closed. Subsequently, the single-chip microcomputer sends the closing fault information of a certain path of the AC contactor to the management platform; When there is a tripping fault in a certain path of the AC contactor, the single-chip microcomputer detects that the defined zero-crossing voltage signal generation circuit in one path continuously outputs high and low levels. After judging that the input of the distribution box is normal, it sends a tripping signal. Then, the zero-crossing voltage signal generation circuit corresponding to a certain path of the AC contactor remains at a continuous high level. When the single-chip microcomputer fails to detect a change in the output level of the corresponding zero-crossing voltage signal generation circuit and this lasts for a period of time, it is judged that a certain path of the AC contactor cannot be tripped. Subsequently, the single-chip microcomputer sends the tripping fault information of a certain path of the AC contactor to the management platform; When there is a fault during the operation of a certain path of the AC contactor, when a certain path of the AC contactor operates normally after closing, the single-chip microcomputer does not issue a tripping instruction, but the single-chip microcomputer detects that the defined zero-crossing voltage signal generation circuit in one path continuously outputs high and low levels, and the zero-crossing voltage signal generation circuit in a certain path changes from continuously outputting high and low levels to continuously outputting high level. The single-chip microcomputer judges that there is a fault in a certain path of the AC contactor. Subsequently, the single-chip microcomputer sends the fault information of a certain path of the AC contactor to the management platform; When a certain path of the AC contactor operates normally after tripping, the single-chip microcomputer does not issue a closing instruction, but the single-chip microcomputer detects that the defined zero-crossing voltage signal generation circuit in one path continuously outputs high and low levels, and the zero-crossing voltage signal generation circuit in a certain path changes from continuously outputting high level to continuously outputting high and low levels. Then the single-chip microcomputer judges that there is a fault in a certain path of the AC contactor. Subsequently, the single-chip microcomputer sends the fault information of a certain path of the AC contactor to the management platform.

6. The method for monitoring the control operation state of the AC contactor in the distribution box according to claim 4, characterized in that, In the monitoring of the idle state of AC contactors, when one or several paths of AC contactors in the distribution box are idle, turn on the corresponding numbered switch of the DIP switch, and pull down the signal voltage input to the single-chip microcomputer by the zero-crossing voltage signal generation circuit corresponding to one or several paths to 0. When the single-chip microcomputer detects that the level voltage of the zero-crossing voltage signal generation circuit in one or several paths is 0, it is judged that the corresponding AC contactor is idle. Subsequently, the information that one or several paths of AC contactors are idle is sent to the management platform.

7. The method for monitoring the control operation state of the AC contactor in the distribution box according to any one of claims 1-6, characterized in that, The zero-crossing voltage signal generation circuit includes a fuse, a rectifier diode, an optocoupler, a protection diode, a pull-up resistor, a current-limiting resistor, and a light-emitting diode. The fuse, the rectifier diode, and the current-limiting resistor are connected in series in sequence and are connected to the anode terminal of the optocoupler. The positive electrode of the protection diode is connected to the cathode terminal of the optocoupler, and the negative electrode of the protection diode is connected to the anode terminal of the optocoupler. The pull-up resistor is connected to the collector terminal of the optocoupler, and the light-emitting diode is connected in parallel between the collector terminal and the emitter terminal of the optocoupler.

8. A system for monitoring the control operation status of an AC contactor in a distribution box, which includes a distribution box, and is characterized in that, The distribution box has an input terminal and multiple AC contactor outputs; It further includes: A zero-crossing voltage signal generation circuit, configured in multiple paths, where one path is used to monitor the voltage at the input terminal of the distribution box, and the remaining paths respectively correspond to the outputs of the multiple AC contactors; A DIP switch, connected to the zero-crossing voltage signal generation circuit; A single-chip microcomputer, connected to the zero-crossing voltage signal generation circuit, for judging various states of the distribution box and the AC contactors according to the input level signal; A relay, for executing the commands of the single-chip microcomputer to control the closing and opening of the multiple AC contactors; A wireless communication module, for interacting and communicating with the management platform, receiving the instructions issued by the management platform and transmitting them to the single-chip microcomputer for execution, and sending the information fed back after the single-chip microcomputer executes the instructions back to the management platform.

9. The system according to claim 8, wherein The zero-crossing voltage signal generation circuit includes a fuse, a rectifier diode, an optocoupler, a protection diode, a pull-up resistor, a current-limiting resistor, and a light-emitting diode. The fuse, the rectifier diode, and the current-limiting resistor are connected in series in sequence and are connected to the anode terminal of the optocoupler. The positive electrode of the protection diode is connected to the cathode terminal of the optocoupler, and the negative electrode of the protection diode is connected to the anode terminal of the optocoupler. The pull-up resistor is connected to the collector terminal of the optocoupler, and the light-emitting diode is connected in parallel between the collector terminal and the emitter terminal of the optocoupler.

10. The system according to claim 8, characterized in that, The input terminal of the distribution box is a three-phase input, and the multiple AC contactors are 8-way AC contactors. All the AC contactors share the three-phase input, and each AC contactor divides out its own three-phase output; The voltage zero-crossing generation circuit is connected to any one of the three-phase inputs; A hook is provided on the distribution box, and the DIP switch is arranged on the outer surface of the distribution box.

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