CN219247458U - Leakage protection system - Google Patents

Abstract

The application relates to a leakage protection system, wherein, this leakage protection system is including consecutive leakage detection circuit, processing module and leakage protection circuit, still includes communication module, communication module with processing module links to each other, wherein: the leakage detection circuit is used for detecting the leakage current of the main circuit and sending leakage current signals to the processing module; the processing module is used for outputting a control instruction based on the leakage current signal and sending the leakage current signal to the communication module; the leakage protection circuit is used for disconnecting the main circuit based on the control instruction; the communication module is used for sending the leakage current signal to an upper computer. Through this application, solved among the correlation technique circuit breaker only can carry out earth leakage protection in order to break circuit connection, lead to the function ratio of circuit breaker single, unable more functional technical problem of integration has improved the richness and the integrality of circuit breaker function, and then has reduced earth leakage detection's hardware cost.

Description

Leakage protection system

Technical Field

The present application relates to the field of circuit protection, and in particular, to a leakage protection system.

Background

In electrical systems, circuit breakers are a commonly used product for earth leakage protection of electrical circuits. Among these, the circuit breaker is also called an air switch, and automatically opens when the current in the circuit exceeds the rated current. The circuit breaker integrates a circuit control function and a circuit protection function as an electrical device in a low voltage distribution network and an electric traction system. In practical application, when a circuit or an electrical device fails, short circuit, overload, electric leakage and the like can be protected. With the development of intelligent technology, the circuit breaker can also perform data acquisition, remote control, fault early warning and the like.

In the related art, a control chip, a crystal oscillator circuit, an optocoupler circuit, a transformer and the like are generally arranged in a circuit breaker, and when the circuit is leaked, the circuit breaker is tripped through a tripping coil, so that the circuit is disconnected; or the circuit is controlled by a singlechip or the like to drive the leakage protection function. However, the circuit breaker in the related art can only perform leakage protection to disconnect the circuit, so that the circuit breaker has a single function and cannot integrate more functions.

Aiming at the technical problems that the circuit breaker in the related art can only perform leakage protection to disconnect the circuit connection, so that the circuit breaker has single function and cannot integrate more functions, no effective solution is proposed at present.

Disclosure of Invention

In this embodiment, a leakage protection system is provided to solve the problem that in the related art, the circuit breaker can only perform leakage protection to disconnect the circuit, so that the function of the circuit breaker is relatively single, and more functions cannot be integrated.

In this embodiment, a leakage protection system is provided, including consecutive leakage detection circuit, processing module and leakage protection circuit, still include communication module, communication module with processing module links to each other, wherein:

the leakage detection circuit is used for detecting the leakage current of the main circuit and sending leakage current signals to the processing module;

the processing module is used for outputting a control instruction based on the leakage current signal and sending the leakage current signal to the communication module;

the leakage protection circuit is used for disconnecting the main circuit based on the control instruction;

the communication module is used for sending the leakage current signal to an upper computer.

In some of these embodiments, the leakage detection circuit includes a residual current transformer.

In some embodiments, the leakage detection circuit further includes an operational amplifier, which is connected between the residual current transformer and the processing module, and is configured to amplify a leakage current signal sent by the residual current transformer and send the leakage current signal to the processing module.

In some embodiments, the processing module further includes an analog-to-digital conversion unit and a processing unit, where the analog-to-digital conversion unit is connected to the leakage detection circuit and the communication module, the processing unit is connected to the leakage protection circuit, and the analog-to-digital conversion unit is configured to perform analog-to-digital conversion on the leakage current signal and send the leakage current signal to the processing unit and the communication module, and the processing unit is configured to output a control instruction based on the converted leakage current signal.

In some embodiments, the control instruction is a high-level signal, the leakage protection circuit includes a unidirectional silicon controlled rectifier, a coil and a switching element that are sequentially connected, the switching element is connected in the main circuit, the unidirectional silicon controlled rectifier is connected with the processing module and is used for receiving the high-level signal and conducting, and the coil is used for acting when the unidirectional silicon controlled rectifier is conducted and triggering the switching element to be disconnected.

In some of these embodiments, the switching element is an air switch.

In some embodiments, the processing module is a single-chip microcomputer.

In some embodiments, the system further comprises a power supply circuit connected to the processing module for supplying power to the processing module.

In some embodiments, the power supply circuit includes a varistor, a diode, a current-limiting resistor, a voltage-stabilizing tube and a capacitor, where the varistor is connected with the anode of the diode, the cathode of the diode is connected with the current-limiting resistor, the current-limiting resistor is connected with the cathode of the voltage-stabilizing tube, the anode of the voltage-stabilizing tube is connected with the varistor, the varistor is connected between the live wire and the zero line in parallel, and the capacitor is connected with two ends of the voltage-stabilizing tube and is connected with the processing module.

In some embodiments, the system further comprises a switching circuit connected with the processing module for switching on or off the leakage protection function of the processing module in response to a user instruction.

Compared with the related art, the leakage protection system provided in this embodiment includes a leakage detection circuit, a processing module and a leakage protection circuit that are connected in sequence, and further includes a communication module, the communication module is connected with the processing module, wherein: the leakage detection circuit is used for detecting the leakage current of the main circuit and sending leakage current signals to the processing module; the processing module is used for outputting a control instruction based on the leakage current signal and sending the leakage current signal to the communication module; the leakage protection circuit is used for disconnecting the main circuit based on the control instruction; the communication module is used for sending the leakage current signal to an upper computer. The leakage current is detected through the leakage detection circuit, the leakage current signal is analyzed through the processor, the circuit protection is carried out through the leakage protection circuit, and the leakage alarm is carried out through the communication module, so that the technical problem that the circuit breaker is single in function and cannot integrate more functions due to the fact that the circuit breaker can only carry out leakage protection to disconnect circuit connection in the related art is solved, the richness and the integrality of the circuit breaker function are improved, and the hardware cost of leakage detection is further reduced.

The details of one or more embodiments of the application are set forth in the accompanying drawings and the description below to provide a more thorough understanding of the other features, objects, and advantages of the application.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiments of the application and together with the description serve to explain the application and do not constitute an undue limitation to the application. In the drawings:

FIG. 1 is a schematic view of a leakage protection system according to an embodiment of the present application;

FIG. 2 is a schematic diagram of a leakage detection circuit according to an embodiment of the present disclosure;

FIG. 3 is a schematic diagram of a leakage protection circuit according to an embodiment of the present disclosure;

FIG. 4 is a schematic diagram of a power supply circuit according to an embodiment of the present disclosure;

FIG. 5 is a schematic view of a leakage protection system according to another embodiment of the present application;

fig. 6 is a schematic flow chart of the leakage protection according to an embodiment of the present application.

Detailed Description

For a clearer understanding of the objects, technical solutions and advantages of the present application, the present application is described and illustrated below with reference to the accompanying drawings and examples.

Unless defined otherwise, technical or scientific terms used herein shall have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terms "a," "an," "the," "these," and the like in this application are not intended to be limiting in number, but rather are singular or plural. The terms "comprising," "including," "having," and any variations thereof, as used in the present application, are intended to cover a non-exclusive inclusion; for example, a process, method, and system, article, or apparatus that comprises a list of steps or modules (units) is not limited to the list of steps or modules (units), but may include other steps or modules (units) not listed or inherent to such process, method, article, or apparatus. The terms "connected," "coupled," and the like in this application are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. Reference to "a plurality" in this application means two or more. "and/or" describes an association relationship of an association object, meaning that there may be three relationships, e.g., "a and/or B" may mean: a exists alone, A and B exist together, and B exists alone. Typically, the character "/" indicates that the associated object is an "or" relationship. The terms "first," "second," "third," and the like, as referred to in this application, merely distinguish similar objects and do not represent a particular ordering of objects.

In one embodiment, the leakage protection system comprises a leakage detection circuit, a processing module and a leakage protection circuit which are connected in sequence, and further comprises a communication module, wherein the communication module is connected with the processing module, and the leakage detection circuit comprises: the leakage detection circuit is used for detecting the leakage current of the main circuit and sending leakage current signals to the processing module; the processing module is used for outputting a control instruction based on the leakage current signal and sending the leakage current signal to the communication module; the leakage protection circuit is used for disconnecting the main circuit based on the control instruction; the communication module is used for sending the leakage current signal to the upper computer

Referring to fig. 1, fig. 1 is a schematic structural diagram of a leakage protection system according to an embodiment of the present application.

Illustratively, as shown in fig. 1, the leakage protection system in the present embodiment includes a leakage detection circuit 100, a processing module 200, and a leakage protection circuit 300, wherein the processing module 200 is connected to the leakage detection circuit 100 and the leakage protection circuit 300 at the same time. Based on this connection structure, the processing module 200 can acquire the signal transmitted from the leakage detection circuit 100 and control the leakage protection circuit 300. The processing module 200 is further connected to the communication module 400 for transmitting interaction signals to the communication module 400.

The leakage detection circuit is illustratively connected to the main circuit being detected, and when there is leakage current in the main circuit, the leakage detection circuit generates a leakage current signal and sends it to the processing module. The leakage current signal is determined based on the leakage current, and for example, if the leakage current is large, a high-level analog signal is generated, and if the leakage current is small, a low-level analog signal is generated. Preferably, the main circuit to be detected is a power supply and distribution circuit of the mains supply, the leakage current is the current leaked between the live wire and the zero line of the main circuit, and is generally tiny, no obvious negative influence is generated on the power supply and distribution circuit, and when the main circuit fails, the leakage current is obviously increased.

The processor is connected with the output end of the leakage detection circuit, and is used for acquiring and analyzing leakage current signals output by the leakage detection circuit, outputting control instructions based on analysis results, wherein the control instructions are used for controlling the leakage protection circuit to take leakage protection measures when a leakage event occurs and not to conduct leakage protection when no leakage event occurs. The processor in this embodiment refers to a computing unit with an arithmetic capability, including but not limited to a single chip microcomputer, a programmable logic controller, etc.; the processor can determine the actual value of the leakage current based on the leakage current signal, determine whether a leakage event occurs based on a threshold comparison method, and then output a control instruction, or output the corresponding high-low level as the control instruction according to the level of the leakage current signal.

The leakage protection circuit is connected with the output end of the processor, and is used for receiving and executing the control instruction sent by the processor, so as to perform leakage protection on the main circuit. For example, the control command is high level, the leakage protection measure is executed, otherwise, the leakage protection measure is not executed; or the control instruction is a pulse signal with a first frequency, the leakage protection measure is executed, the control instruction is a pulse signal with a second frequency, and the leakage protection measure is not executed.

In this embodiment, a communication module is further provided, and the communication module is connected to an output end of the processor, and is configured to obtain a leakage current signal sent by the processor, send the leakage current signal to the upper computer through the transmission channel, and analyze and alarm the leakage current signal by the upper computer. Or the processor analyzes the leakage current signal to obtain an analysis result, and sends the analysis result to the upper computer through the communication module. The upper computer is a computing unit with operation and communication functions, and a specific processing program is run in the upper computer, and can be set as a monitoring platform or the like or as a terminal device with a CPU or the like.

The leakage protection system in this embodiment includes the leakage detection circuit, processing module and the leakage protection circuit that link to each other in proper order, still includes communication module, and communication module links to each other with processing module, wherein: the leakage detection circuit is used for detecting the leakage current of the main circuit and sending leakage current signals to the processing module; the processing module is used for outputting a control instruction based on the leakage current signal and sending the leakage current signal to the communication module; the leakage protection circuit is used for disconnecting the main circuit based on the control instruction; the communication module is used for sending the leakage current signal to the upper computer. The leakage current is detected through the leakage detection circuit, the leakage current signal is analyzed through the processor, the circuit protection is carried out through the leakage protection circuit, and the leakage alarm is carried out through the communication module, so that the problem that the circuit breaker in the related art can only carry out leakage protection to disconnect circuit connection, the function of the circuit breaker is single, more functions and technical problems cannot be integrated is solved, the richness and the integrality of the functions of the circuit breaker are improved, and the hardware cost of leakage detection is further reduced.

Referring to fig. 2, fig. 2 is a schematic structural diagram of a leakage detection circuit according to an embodiment of the present application.

In another embodiment, the leakage detection circuit includes a residual current transformer.

Illustratively, a residual current transformer is arranged in the leakage detection circuit and is used for collecting leakage current of the main circuit. The residual current transformer collects leakage current of the main circuit through an internal transformer core and converts the leakage current of the primary circuit into output voltage of the secondary circuit, the transformer core generally adopts an annular structure, a winding iron core or a punching iron core can be adopted, and the size of the transformer core is determined according to the structure and the sensitivity of the circuit breaker.

The residual current transformer in the leakage detection circuit is used for collecting the leakage current of the main circuit, the wiring of the residual current transformer is less, the overall integration level is high, and the installation is convenient, so that the installation and maintenance cost of the leakage protection system is reduced.

In another embodiment, the leakage detection circuit further includes an operational amplifier, which is connected between the residual current transformer and the processing module, and is configured to amplify the leakage current signal sent by the residual current transformer and send the amplified leakage current signal to the processing module.

An operational amplifier is further disposed between the residual current transformer and the processing module of the leakage detection circuit, and is configured to obtain and amplify the leakage current signal output by the residual current transformer, and send the amplified leakage current signal to the processing module.

Specifically, the operational amplifier in the present embodiment is a circuit unit having a high amplification factor. In the circuit, the operational amplifier often has a special coupling circuit and feedback, and the output signal can be the operation result of addition, subtraction, differentiation or integration of the input signal.

Referring to fig. 2, fig. 2 is a schematic structural diagram of a leakage detection circuit according to an embodiment of the present application.

Specifically, as shown in fig. 2, a live wire L and a zero wire N of a power supply and distribution circuit of a commercial power pass through a residual current transformer ZCT, and a leakage current is induced by the residual current transformer ZCT to generate a leakage current signal and send the leakage current signal to an operational amplifier U1; the operational amplifier U1 acquires and amplifies the leakage current signal, and sends the amplified leakage current signal to an input port ADC of the analog-to-digital converter so as to perform analog-to-digital conversion on the leakage current signal to obtain a signal which can be received by a processor; and the processor receives the signals and then calculates the acquired signals to obtain corresponding leakage current values.

Specifically, as shown in fig. 2, a plurality of electronic components are further disposed in the leakage detection circuit. The first resistor R1, the second resistor R2 and the first capacitor C1 form an RC parallel circuit, the fourth resistor R4 and the third capacitor R3 form an RC parallel circuit for filtering leakage current signals, the third resistor R3 is a current limiting resistor for adjusting the value of the leakage current signals, the second capacitor C2 is an isolation capacitor, the reverse input port 2 of the operational amplifier U1 inputs the leakage current signals, the in-phase input port 1 inputs the operational signals, and the output port 3 outputs amplified signals.

According to the embodiment, the leakage current signal is amplified through the operational amplifier, so that the characteristics of the leakage current signal are more obvious, and the accuracy of the processor in analyzing the leakage current signal is improved.

In another embodiment, the processing module further includes an analog-to-digital conversion unit and a processing unit, the analog-to-digital conversion unit is connected with the leakage detection circuit and the communication module, the processing unit is connected with the leakage protection circuit, the analog-to-digital conversion unit is used for performing analog-to-digital conversion on the leakage current signal and sending the leakage current signal to the processing unit and the communication module, and the processing unit is used for outputting a control instruction based on the converted leakage current signal.

The processing module in this embodiment includes an analog-to-digital conversion unit and a processing unit, where the analog-to-digital conversion unit and the processing unit may be two electronic devices that are independent of each other, and may also be integrated in the same integrated circuit, for example, integrated in the same single-chip microcomputer.

The analog-to-digital conversion unit is also connected with the leakage detection circuit and the communication module, and the analog-to-digital conversion unit obtains and converts the leakage current signal sent by the leakage detection circuit and sends the converted signal to the processing unit and the communication module. It can be understood that, since the leakage current signal output by the leakage detection circuit is an analog signal, and the processing unit and the communication unit preferably receive digital signals, in this embodiment, an analog-to-digital conversion unit is provided to convert the leakage current signal into digital signals that can be directly operated by the processing unit and the communication module.

The processor is further connected to the leakage protection circuit, and the processor receives and analyzes the converted leakage current signal to calculate the magnitude of the leakage current, further determine whether to take leakage protection measures, generate a control instruction based on the determination result, and send the control instruction to the leakage protection circuit, so that the leakage protection circuit executes the control instruction.

In the embodiment, the analog-digital conversion unit and the processing unit are respectively arranged, the analog-digital conversion unit is used for converting the leakage current signal to obtain the digital signal which can be directly used by the processing unit, so that the efficiency of analyzing the leakage current signal by the processing module and the response speed of leakage protection are improved.

In another embodiment, the control command is a high level signal, the leakage protection circuit comprises a unidirectional silicon controlled rectifier, a coil and a switching element which are sequentially connected, the switching element is connected in the main circuit, the unidirectional silicon controlled rectifier is connected with the processing module and is used for receiving the high level signal and conducting, and the coil is used for acting when the unidirectional silicon controlled rectifier is conducted and triggering the switching element to be disconnected.

Illustratively, the leakage protection circuit is provided with a unidirectional silicon controlled rectifier, a coil and a switching element, wherein the unidirectional silicon controlled rectifier is electrically connected with the coil, and the coil is mechanically or magnetically connected with the switching element.

Illustratively, the control instruction in the present embodiment is a high-level signal, that is, the earth leakage protection circuit performs the earth leakage protection measure when receiving the high-level signal. Specifically, the unidirectional silicon controlled rectifier is also connected with the processing module, the unidirectional silicon controlled rectifier is in an off state when no high-level signal is input, and the unidirectional silicon controlled rectifier is conducted when the high-level signal sent by the processing module is received, and the coil is conducted at the moment.

Illustratively, the switching element in the present embodiment is connected in the main circuit for controlling the on-off of the main circuit. When the coil is conducted, an acting force is generated on the switching element, and the switching element is controlled to be disconnected, so that leakage protection is realized.

The control instruction is set to be high level, the unidirectional silicon controlled rectifiers, the coils and the switching elements which are sequentially connected are arranged in the leakage protection circuit, the processing module outputs high level to control the unidirectional silicon controlled rectifiers to be conducted, the coils are further controlled to be conducted, the switching elements are controlled to be disconnected after the coils are conducted, the control logic is simple, and the unidirectional silicon controlled rectifiers also have the advantages of being stable in electrical characteristics, easy to install and the like, so that the cost of a leakage protection system is reduced, and the stability is improved.

In another embodiment, the switching element is an air switch.

The switching element is illustratively provided as an air switch. The air switch is an air circuit breaker, and when the coil generates an acting force on the air switch, the air switch trips based on electromagnetic force, thereby breaking the circuit.

In this embodiment, the switching element is configured as an air switch, where the air switch has good arc extinguishing characteristics compared to other switching elements, thereby improving the safety of the leakage protection system.

In another embodiment, the processing module is a single chip microcomputer.

The processing module is illustratively set as a single-chip microcomputer, and the functions of analog-to-digital conversion and signal processing are integrated in the single-chip microcomputer at the same time, so as to be used for converting and analyzing leakage current signals.

In this embodiment, the processing module is set as a single-chip microcomputer, where the single-chip microcomputer has the advantages of small volume, high integration level, high anti-industrial noise performance, easy expansion, and the like, so that the stability of the leakage protection system is improved, and the hardware cost is reduced.

Referring to fig. 3, fig. 3 is a schematic structural diagram of a leakage protection circuit according to an embodiment of the present application.

Specifically, as shown in fig. 3, the GPIO port of the low-power consumption single-chip microcomputer U2 is always kept in a low-level state by default initially, when the low-power consumption single-chip microcomputer U2 collects leakage current signals from the ADC port of the analog-to-digital conversion and the calculated leakage current value is greater than the leakage current threshold value set in the interior, the GPIO port of the low-power consumption single-chip microcomputer U2 outputs high-level signals to drive the unidirectional silicon controlled rectifier Q1 to be conducted, then the shunt tripping coil T1 is conducted, at this time, the shunt tripping coil T1 acts, and then the air switch is pushed to be disconnected. Meanwhile, the low-power consumption singlechip U2 actively reports the leakage event to the upper computer.

Specifically, as shown in fig. 3, the leakage protection circuit is further provided with a first diode D1 for unidirectional filtering of current, a fifth resistor R5 for numerical adjustment of an output high-level signal of the low-power consumption single chip microcomputer U2, and a fourth capacitor for isolating the high-level signal.

In another embodiment, the device further comprises a power supply circuit connected with the processing module for supplying power to the processing module.

The leakage protection system of the present embodiment is further provided with a power supply circuit, and the power supply circuit is connected to the processing module to supply power to the processing module.

In another embodiment, the power supply circuit comprises a piezoresistor, a diode, a current-limiting resistor, a voltage-stabilizing tube and a capacitor, wherein the piezoresistor is connected with the positive electrode of the diode, the negative electrode of the diode is connected with the current-limiting resistor, the current-limiting resistor is connected with the negative electrode of the voltage-stabilizing tube, the positive electrode of the voltage-stabilizing tube is connected with the piezoresistor, the piezoresistor is connected between the live wire and the zero wire in parallel, and the capacitor is connected with two ends of the voltage-stabilizing tube and is connected with the processing module.

Referring to fig. 4, fig. 4 is a schematic structural diagram of a power supply circuit according to an embodiment of the present application.

As shown in fig. 4, the power supply circuit is further provided with a varistor RV1, a second diode D2, a current limiting resistor R6, a regulator D3, and a fifth capacitor C5, where the second diode D2 is configured to convert the alternating current to obtain direct current; the current limiting resistor R6 is used for limiting the obtained direct current; the voltage stabilizing tube D3 and the fifth capacitor C5 are used for outputting the output current of the direct current power supply VCC and stabilizing and filtering; the piezoresistor RV1 is used for carrying out overvoltage clamping when a power supply circuit is overvoltage, and absorbing redundant current to protect the circuit.

The power supply circuit shown in the embodiment can output a stable direct current power supply for the processing module in a short time, so as to supply power for the processing module, improve the processing efficiency of the processing module, and further improve the response speed of the leakage protection system.

In another embodiment, the leakage protection system further comprises a switching circuit connected to the processing module for switching on or off the leakage protection function of the processing module in response to a user command.

Illustratively, the leakage protection system in this embodiment is further provided with a switch circuit for connecting the processing module. The switch circuit can receive an instruction input by a user, is turned on or off based on the user instruction, and further controls the processing module to be turned on or turned off, so that the leakage protection function of the processing module is manually turned on or turned off.

According to the embodiment, the switch circuit is arranged in the leakage protection system, so that the leakage protection function is manually turned on and off, and the use flexibility of the leakage protection system is improved. Meanwhile, when the leakage protection is not needed, the leakage protection function can be directly closed in a manual mode, so that the use cost of the leakage protection system is reduced.

Referring to fig. 5, fig. 5 is a schematic structural diagram of a leakage protection system according to another embodiment of the present application.

In combination with the above embodiments, the present application provides a hardware structure of a leakage protection system. Specifically, as shown in fig. 5, the leakage transformer collects leakage current signals, the operational amplifier amplifies the leakage current signals, the ADC port of the low-power-consumption single-chip microcomputer collects leakage current data, and the current leakage current value is calculated through an internal algorithm. And then the unidirectional silicon controlled rectifier is driven through the GPIO port, and then the shunt tripping coil is driven to disconnect the air switch.

Specifically, as the processing module is set as the singlechip, the magnitude of the leakage current threshold value can be set in the singlechip, and whether the GPIO port is driven or not can be selected through the internal control logic, namely whether the air switch is disconnected or not. The main singlechip communicates with the low-power consumption singlechip through various communication interfaces (shown as UART interfaces), and sends various control instructions (such as setting whether leakage tripping occurs or not and the value of the tripped leakage current) and reads the leakage current value.

Specifically, the low-power-consumption singlechip and the main singlechip are electrified through the power supply circuit, and an optical coupler is further arranged between the power supply circuit and the main singlechip and the low-power-consumption singlechip so as to isolate signals.

Referring to fig. 6, fig. 6 is a schematic flow chart of the leakage protection according to an embodiment of the present application.

Specifically, as shown in fig. 6, the low-power consumption single-chip microcomputer of the main single-chip microcomputer runs respective programs, and the two single-chip microcomputer can communicate with each other. When the leakage protection is carried out, the main singlechip gives an instruction to the low-power-consumption singlechip, and the low-power-consumption singlechip receives and analyzes the leakage current signal and reads the leakage current value; further, if the leakage current value exceeds the preset threshold value, a high-level signal is output through the GPIO port to control the air switch to disconnect the main circuit, and if the leakage current value does not exceed the preset threshold value, the steps are returned to, and the leakage current value is read again and analyzed.

Specifically, the low-power consumption singlechip uniformly samples the data with the period of 10mS for 10 times, namely 1mS reads 1 time of ADC value, for example, the 1 st time is X1, the 2 nd time is X2 … …, the 10 th time is X10, and the formula is utilized:

and calculating a Y value. Let the actual leakage current value be 5mA at this time, set Y calculated at this time to Y1. Since the Y value is linear, when the calculated value is 2Y1, the current leakage current value is 10mA, and when the calculated value is 10Y1, the current leakage current value is 50mA.

It should be understood that the specific embodiments described herein are merely illustrative of this application and are not intended to be limiting. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present application, are within the scope of the present application in light of the embodiments provided herein.

It is evident that the drawings are only examples or embodiments of the present application, from which the present application can also be adapted to other similar situations by a person skilled in the art without the inventive effort. In addition, it should be appreciated that while the development effort might be complex and lengthy, it would nevertheless be a routine undertaking of design, fabrication, or manufacture for those of ordinary skill having the benefit of this disclosure, and thus should not be construed as an admission of insufficient detail.

The term "embodiment" in this application means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive. It will be clear or implicitly understood by those of ordinary skill in the art that the embodiments described in this application can be combined with other embodiments without conflict.

The above examples only represent a few embodiments of the present application, which are described in more detail and are not to be construed as limiting the scope of the patent. It should be noted that it would be apparent to those skilled in the art that various modifications and improvements could be made without departing from the spirit of the present application, which would be within the scope of the present application. Accordingly, the scope of protection of the present application shall be subject to the appended claims.

Claims (9)

1. The utility model provides a leakage protection system, its characterized in that, including electric leakage detection circuit, processing module and the leakage protection circuit that links to each other in proper order, still includes communication module, communication module with processing module links to each other, wherein:

the leakage detection circuit is used for detecting the leakage current of the main circuit and sending leakage current signals to the processing module;

the processing module is used for outputting a control instruction based on the leakage current signal and sending the leakage current signal to the communication module;

the leakage protection circuit is used for disconnecting the main circuit based on the control instruction;

the communication module is used for sending the leakage current signal to an upper computer;

the electric leakage protection device further comprises a switch circuit, wherein the switch circuit is connected with the processing module and is used for responding to a user instruction and starting or closing the electric leakage protection function of the processing module.

2. The leakage protection system of claim 1, wherein the leakage detection circuit comprises a residual current transformer.

3. The leakage protection system of claim 2, wherein the leakage detection circuit further comprises an operational amplifier connected between the residual current transformer and the processing module for amplifying the leakage current signal sent by the residual current transformer and sending the amplified leakage current signal to the processing module.

4. The leakage protection system according to claim 1, wherein the processing module further comprises an analog-to-digital conversion unit and a processing unit, the analog-to-digital conversion unit is connected to the leakage detection circuit and the communication module, the processing unit is connected to the leakage protection circuit, the analog-to-digital conversion unit is configured to perform analog-to-digital conversion on the leakage current signal and send the leakage current signal to the processing unit and the communication module, and the processing unit is configured to output a control instruction based on the converted leakage current signal.

5. The leakage protection system according to claim 1, wherein the control command is a high level signal, the leakage protection circuit comprises a unidirectional silicon controlled rectifier, a coil and a switching element, which are sequentially connected, the switching element is connected in the main circuit, the unidirectional silicon controlled rectifier is connected with the processing module and is used for receiving the high level signal and conducting, and the coil is used for acting when the unidirectional silicon controlled rectifier is conducting and triggering the switching element to be disconnected.

6. The earth leakage protection system of claim 5, wherein the switching element is an air switch.

7. The earth leakage protection system of claim 1, wherein the processing module is a single-chip microcomputer.

8. The earth leakage protection system of claim 1 or 7, further comprising a power supply circuit coupled to the processing module for supplying power to the processing module.

9. The leakage protection system of claim 8, wherein the power supply circuit comprises a varistor, a diode, a current limiting resistor, a voltage stabilizing tube and a capacitor, the varistor is connected with the anode of the diode, the cathode of the diode is connected with the current limiting resistor, the current limiting resistor is connected with the cathode of the voltage stabilizing tube, the anode of the voltage stabilizing tube is connected with the varistor, the varistor is connected between a live wire and a zero wire in parallel, and the capacitor is connected with both ends of the voltage stabilizing tube and is connected with the processing module.

Images