CN112736835B - Residual current protection device - Google Patents
Residual current protection device Download PDFInfo
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- CN112736835B CN112736835B CN202011396515.XA CN202011396515A CN112736835B CN 112736835 B CN112736835 B CN 112736835B CN 202011396515 A CN202011396515 A CN 202011396515A CN 112736835 B CN112736835 B CN 112736835B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/26—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents
- H02H3/32—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H1/00—Details of emergency protective circuit arrangements
- H02H1/0007—Details of emergency protective circuit arrangements concerning the detecting means
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Abstract
The application relates to a residual current protection device, including: the device comprises a residual current detection module, a processor and an execution module, wherein the residual current detection module comprises a fluxgate current sensor; the fluxgate current sensor is connected with the execution module through the processor and is connected with the line to be tested in an induction way; the residual current detection module is used for inducing at least one of an alternating current component, a direct current component and a high-frequency component in the residual current of the circuit to be detected through the fluxgate current sensor; the processor is used for processing the voltage signal according to the type of the current component after the residual current detection module converts the residual current into the voltage signal, and judging whether to send an indication signal to the execution module or not according to a processing result; and the execution module is used for performing residual current protection on the line to be tested according to the indication signal. The device has simple connection relation, high detection accuracy and efficiency, and can play effective residual current protection for residual current in the circuit to be detected.
Description
Technical Field
The application relates to the technical field of detection of power distribution circuits, in particular to a residual current protection device.
Background
The residual current protection device is an important low-voltage protection device, is mainly used for protecting equipment when residual current faults occur and people with fatal danger get electric shock, and is widely applied to the field of low-voltage distribution and utilization.
With the implementation of national energy conservation and emission reduction policies, photovoltaic power, energy storage, electric vehicles and the like are connected to the power distribution network in large quantities. At present, the typical loads of municipal administration, residential buildings and other scenes have a direct current trend, and for example, street lamps, traffic lights, direct current variable frequency air conditioners and the like have been developed for trial application. The existing detection technology of the residual current protection device in the distribution line for the residual current cannot detect different components existing in the residual current.
Therefore, the existing residual current protection device has low accuracy in detecting the residual current in the distribution line and cannot effectively protect the distribution line.
Disclosure of Invention
Therefore, it is necessary to provide a residual current protection device for the above technical problem, which can implement accurate detection of different components in the residual current of the line to be detected, has high detection accuracy and efficiency, and is simple in connection relationship, and can effectively prevent the occurrence of leakage accidents.
A residual current protection device, the device comprising: the device comprises a residual current detection module, a processor and an execution module, wherein the residual current detection module comprises a fluxgate current sensor; the fluxgate current sensor is connected with the execution module through the processor and is in induction connection with a line to be tested;
the residual current detection module is used for inducing the residual current of the line to be detected through the fluxgate current sensor, wherein the type of the current component of the residual current comprises at least one of an alternating current component, a direct current component and a high-frequency component;
the processor is used for processing the voltage signal according to the type of the current component after the residual current detection module converts the residual current into the voltage signal, and judging whether to send an indication signal to the execution module according to a processing result;
and the execution module is used for protecting the current to be tested according to the indication signal.
In one embodiment, the processor is specifically configured to:
analyzing the voltage signal to obtain the current value of each current component in the voltage signal;
and determining whether to send the indication signal to the execution module according to the voltage value of each current component and a preset current threshold.
In one embodiment, the processor is specifically configured to:
acquiring the times that the current value of the current component is continuously larger than a preset current threshold;
and determining whether to send the indication signal to the execution module according to the times and a preset time threshold.
In one embodiment, the processor is specifically configured to:
and sending the indication signal to the execution module under the condition that the times are greater than a preset time threshold.
In one embodiment, the processor is specifically configured to:
and after the indication signal is sent to the execution module, clearing the times.
In one embodiment, the different current component types correspond to respective current thresholds.
In one embodiment, the residual current detection module further comprises a regulating circuit and a filter circuit, and the fluxgate current sensor is electrically connected with the filter circuit through the regulating circuit;
the regulating circuit is used for converting the residual current into a forward voltage signal;
the filter circuit is used for filtering noise voltage signals in the forward voltage signals.
In one embodiment, the execution module comprises a driving circuit and an execution mechanism, and the execution mechanism is connected with the processor through the driving circuit;
the driving circuit is used for receiving the indication signal to drive the actuating mechanism;
and the actuating mechanism is used for protecting the current to be measured.
In one embodiment, the device further comprises a display module, a communication module and a power supply module, and the display module, the communication module and the power supply module are all connected with the processor.
In one embodiment, the fluxgate current sensor is configured to sense the residual current by superimposing a first magnetic field generated by the fluxgate current sensor and a second magnetic field generated by the residual current.
The residual current protection device comprises a residual current detection module, a processor and an execution module, wherein each module is electrically connected with a preset mode. Wherein the residual current detection module includes fluxgate current sensor, and fluxgate current sensor can detect at least one of direct current component, alternating current component and high frequency component in the residual current of the circuit that awaits measuring, and can eliminate the magnetic field interference that fluxgate sensor self produced, can the at utmost reduce out the residual current in the circuit that awaits measuring, has improved the residual current detection's in the circuit that awaits measuring precision, has promoted the detection accuracy and the efficiency of residual current, provides reliable foundation for the protection of residual current. And the processor judges whether to send an indication signal to the execution module according to a processing result so as to protect the line to be tested. The application provides a residual current protection device, simple structure, direct current component, alternating current component and high frequency component in the detection residual current that can be accurate, detection efficiency is high, can play effective protection to the circuit that awaits measuring.
Drawings
FIG. 1 is a schematic diagram of an embodiment of a residual current protection device;
FIG. 2 is a schematic structural diagram of a residual current protection device in another embodiment;
FIG. 3 is a schematic diagram of a residual current protection device according to yet another embodiment;
FIG. 4 is a block diagram of the circuit connections of the conditioning circuit and the filtering circuit in another embodiment;
fig. 5 is a schematic structural diagram of a processor in another embodiment.
Description of the reference numerals:
10. a residual current detection module; 1011. A fluxgate current sensor;
1012. a regulating circuit; 1013. A filter circuit;
20. a processor; 201. A forward voltage signal input;
30. an execution module; 301. A drive circuit;
302. an actuator; 40. A display module;
50. a power supply module; 60. And a communication module.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application more clearly understood, the embodiments of the present application are described in further detail below with reference to the accompanying drawings and the embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and do not delimit the present application.
The residual current protection device is an important low-voltage protection device, can prevent personal electric shock, electrical fire and electrical equipment damage, can be used for commercial use, can also be used in the low-voltage power distribution and utilization fields of buildings such as office buildings, urban and rural residential buildings and the like, and plays an important role in the safety protection of a low-voltage power grid.
Fig. 1 is a residual current protection device according to an embodiment of the present application. As shown in fig. 1, the apparatus includes: the residual current detection module 10, the processor 20 and the execution module 30, wherein the residual current detection module 10 comprises a fluxgate current sensor 1011; the fluxgate current sensor 1011 is connected to the execution module 30 through the processor 20, and the fluxgate current sensor 1011 is connected to the line to be tested by sensing. The residual current detection module 10 is configured to sense a residual current of a line to be detected through the fluxgate current sensor 1011, where a current component type of the residual current includes at least one of an ac component, a dc component, and a high-frequency component; the processor 20 is configured to, after the residual current detection module 10 converts the residual current into a voltage signal, process the voltage signal according to the current component type, and determine whether to send an indication signal to the execution module 30 according to a processing result; and the execution module 30 is configured to protect the line to be tested according to the indication signal.
Specifically, the residual current protection device is used for protecting the circuit to be tested, and the residual current protection device can detect the residual current in the circuit to be tested through the residual current detection module 10 at a preset time interval, and can induce the residual current of the circuit to be tested through the fluxgate current sensor 1011 in the residual current detection module 10 under the condition that the residual current exists in the circuit to be tested, and convert the residual current into a forward voltage signal and then transmit the forward voltage signal to the processor 20. The device has simple wiring among all modules and is convenient to operate.
Optionally, for the fluxgate current sensor 1011 in the residual current detection module 10, a bus in the line to be detected passes through an aperture of the fluxgate current sensor, and the fluxgate current sensor 1011 can sense a current signal passing through the aperture. This current signal can be direct current signal, alternating current signal or high frequency alternating current signal, so residual current detection module 10 can detect the residual current component of the different grade type in the circuit that awaits measuring when detecting the residual current in the circuit that awaits measuring, has simplified the circuit of traditional technique, has improved the detection efficiency of residual current.
Optionally, the fluxgate current sensor 1011 is configured to sense the residual current by superimposing a first magnetic field generated by the fluxgate current sensor 1011 and a second magnetic field generated by the residual current. The fluxgate current sensor 1011 is a multi-closed-loop control system comprising an excitation flux closed-loop control module and a multi-flux closed-loop control module, the excitation flux closed-loop control module detects a target excitation magnetic field generated by the excitation unit, generates an excitation compensation signal according to the detected excitation detection signal, generates an excitation compensation magnetic field around the target excitation magnetic field according to the excitation compensation signal, the excitation compensation magnetic field and the target excitation magnetic field are mutually superposed, and the magnetic flux of the superposed excitation superposed magnetic field passing through a plane perpendicular to a magnetic induction line is zero; the multi-magnetic-flux closed-loop control module detects an alternating current magnetic field and a high-frequency magnetic field generated by current to be detected and generates alternating current and high-frequency magnetic flux compensation signals according to the detected alternating current and high-frequency magnetic flux signals; the multi-flux closed-loop control module also generates a direct-current magnetic bias compensation signal according to the direct-current magnetic bias signal, generates a target multi-flux compensation signal according to the alternating-current and high-frequency magnetic flux compensation signals and the direct-current magnetic bias compensation signal, generates a multi-flux compensation magnetic field around the circuit to be detected according to the target multi-flux compensation signal, and superposes the multi-flux compensation magnetic field with the direct-current magnetic field and the alternating-current magnetic field, and the magnetic flux of the superposed multi-flux superposed magnetic field penetrating through a plane perpendicular to a magnetic induction line is zero, so that the magnetic field interference generated by the excitation module is eliminated, the detection of alternating current and direct current is realized, the current detection precision of the sensor is improved, and the production cost of the sensor is reduced.
To sum up, the excitation compensation magnetic field, the target excitation magnetic field and the multi-flux compensation magnetic field correspond to the first magnetic field generated by the fluxgate current sensor, the direct current magnetic field generated by the residual current, the alternating current magnetic field and the high-frequency magnetic field correspond to the second magnetic field generated by the residual current, and after the first magnetic field and the second magnetic field are superposed, the fluxgate current sensor arranged in the residual current protection device can detect the direct current component, the alternating current component and the high-frequency component in the residual current component, and can eliminate the magnetic field interference generated by the fluxgate current sensor 1011 itself, the fluxgate current sensor can maximally restore the residual current in the line to be detected, so that the precision of residual current detection in the line to be detected is improved, the detection accuracy and efficiency of the residual current are improved, and a reliable basis is provided for residual current protection.
Further, after the residual current detection module senses a residual current through the fluxgate current sensor 1011, the residual current is converted into a voltage signal and output to the processor, and the processor 20 processes the voltage signal according to the current component type and determines whether to send an indication signal to the execution module 30 according to the processing result.
Optionally, the processor 20 presets different voltage signal processing manners corresponding to the types of the current components, for example, the processor 20 may preset a direct current threshold corresponding to the direct current component, an alternating current threshold corresponding to the alternating current component, and a high-frequency current threshold corresponding to the high-frequency component. After the processor 20 determines the current component type of the voltage signal, a corresponding current threshold may be determined according to the current component type, and when the voltage value of the voltage signal exceeds the current threshold, the processor 20 may send an indication signal to the execution module 30 to indicate the execution module 30 to protect the line to be tested, for example, the processor 20 may indicate the execution module 30 to perform a power-off operation on the line to be tested, and the like.
The residual current protection device provided by the embodiment of the application comprises a residual current detection module, a processor and an execution module, wherein the residual current detection module comprises a fluxgate current sensor; the fluxgate current sensor is connected with the execution module through the processor, and is connected with the line to be tested in an induction mode. Wherein, after the residual current detection module can respond to the residual current in the circuit that awaits measuring through fluxgate current sensor, convert this residual current into voltage signal transmission to treater for the treater can be handled voltage signal according to the current component type, and judges whether send instruction signal for the execution module according to the processing result, in order to protect the circuit that awaits measuring. In the embodiment, because the residual current detection module performs residual current induction through the fluxgate current sensor, due to the characteristics of the fluxgate current sensor, the residual current detection module can eliminate magnetic field interference generated by the fluxgate current sensor, reduce the residual current in the line to be detected to the maximum extent, realize detection of direct current components, alternating current components and high-frequency components in the residual current, improve the precision of residual current detection in the line to be detected, improve the detection accuracy of the residual current, and provide reliable basis for protecting the line to be detected; and meanwhile, the wiring complexity of the protection circuit is also reduced.
Fig. 2 is a schematic structural diagram of a residual current protection device according to an embodiment of the present application. On the basis of the foregoing embodiment, as shown in fig. 2, optionally, the residual current detection module 10 further includes a regulating circuit 1012 and a filter circuit 1013, and the fluxgate current sensor 1011 is electrically connected to the filter circuit 1013 through the regulating circuit 1012; the adjusting circuit 1012 is used for converting residual current into a forward voltage signal; the filter circuit 1013 is configured to filter a noise voltage signal in the forward voltage signal.
Specifically, the output terminal of the fluxgate current sensor 1011 is connected to the input terminal of the adjustment circuit 1012, the output terminal of the adjustment circuit 1012 is connected to the input terminal of the filter circuit 1013, and the output terminal of the filter circuit 1013 is connected to the input terminal of the processor 20.
The adjusting circuit 1012 may receive the induced current transmitted by the fluxgate current sensor 1011 and convert the induced current into a forward voltage signal that the processor 20 can receive and process. Illustratively, as shown in fig. 4, the diagram includes a circuit structure diagram of the adjusting circuit 1012, wherein the adjusting circuit 1012 includes a voltage regulator circuit, an operational amplifier chip, 3 resistors and 2 capacitors, and the connection relationship is shown in fig. 4. The power supply end of the voltage stabilizing circuit and the power supply end of the operational amplifier are both connected with the power supply end of the processor 20, the output end of the voltage stabilizing circuit is connected with the non-inverting input end of the operational amplifier chip, the voltage stabilizing circuit can achieve the purpose of changing the magnitude of the input voltage of the power supply end by adjusting the internal resistance of the voltage stabilizing circuit, the voltage processed by the voltage stabilizing circuit flows into the operational amplifier chip, and meanwhile, the induced current detected by the fluxgate current sensor 1011 flows into the operational amplifier through a resistor. Since the operational amplifier chip can perform operations such as addition, subtraction, multiplication, and division, a forward voltage signal that can be received and processed by the processor 20 can be obtained by calculating a voltage signal flowing into the operational amplifier chip through the voltage regulator circuit and a current signal induced from the fluxgate current sensor 1011.
On the basis of the above embodiment, as shown in fig. 4, the circuit structure of the filter circuit 1013 is further included in the figure, the filter circuit 1013 includes an operational amplifier chip, 3 resistors and 2 capacitors, and the connection relationship is shown in fig. 4. The filter circuit 1013 and the adjusting circuit 1012 share one operational amplifier chip, which can save cost. The filter circuit 1013 can filter a noise voltage signal, which may be a harmonic voltage signal above 10KHZ, from the forward voltage signal converted and output from the adjustment circuit 1012.
The residual current protection device that this application embodiment provided still is provided with regulating circuit among the above-mentioned residual current detection module, can be to convert the induced-current signal from fluxgate current sensor output, and the induced-current after the conversion can more adapt to the treater, and the receipt and the processing of the treater of being convenient for have improved signal processing's efficiency, have further improved residual current detection's efficiency. Moreover, the residual current protection device is also provided with a filter circuit, and the purpose of the filter circuit is to filter the voltage signal output from the regulating circuit, eliminate the interference of the noise voltage signal on the detected voltage signal, ensure the accuracy of the residual current detection and provide reliable data support for the protection of the residual current.
Fig. 3 is a schematic structural diagram of a residual current protection device according to another embodiment of the present application. On the basis of the foregoing embodiment, as shown in fig. 3, optionally, the execution module 30 includes a driving circuit 301 and an execution mechanism 302, and the execution mechanism 302 is connected to the processor 20 through the driving circuit 301; a driving circuit 301 for receiving the indication signal and driving the actuator 302 according to the indication signal; and the actuator 302 is used for protecting the line to be tested under the driving of the driving circuit 301.
Specifically, execution module 30 may be in wired or wireless communication with processor 20 such that execution module 30 receives the indication signal sent by processor 20. That is, the execution module 30 and the processor 20 may be connected by wire or wirelessly. The execution module 30 includes a driving circuit 301 and an execution mechanism 302, the execution mechanism 302 may be a switch, and the driving circuit 301 controls the switch to be turned off according to the indication signal sent by the processor 20, so as to achieve the purpose of protecting the residual current.
The residual current protection device that this application embodiment provided, execution module among the above-mentioned residual current protection device includes drive circuit, and drive circuit can be according to the instruction signal drive actuating mechanism that receives the treater and send and carry out the protection action to the circuit that awaits measuring to reach the mesh to the circuit protection that awaits measuring. The execution module further comprises an execution mechanism, the execution mechanism is used for executing protection actions on the circuit to be tested, for example, the execution mechanism can be a disconnecting switch and can be used for preventing residual current from flowing into human bodies or household appliances and other devices so as to avoid the residual current from harming human bodies or the household appliances.
Optionally, the residual current protection device further includes: the display module 40, the communication module 60 and the power supply module 50, wherein the display module 40, the communication module 60 and the power supply module 50 are all electrically connected with the processor 20.
Specifically, the display module 40 is used for displaying the current value of each component processed by the processor 20 and the operating state of each module.
The communication module 60 is configured to transmit data between the processor 20 and other devices that need to communicate, for example, the communication device may be an upper computer, and the processor 20 may transmit the data to the upper computer in real time through the communication module 60, so that the upper computer performs analysis or storage. The upper computer can also send instruction information to the processor 20 through the communication module 60 to instruct the processor 20 to perform corresponding actions according to the instruction information.
The power supply module 50 is used for supplying power to the residual current protection device, and may be connected to the processor 20 only, and the other modules are connected to the processor 20 to supply power to all the modules, or may be connected to each module separately to supply power to all the modules.
According to the residual current protection device provided by the embodiment of the application, the display module in the residual current protection device can display the detection result and the real-time working state of each module in real time, and meanwhile, when the device breaks down, the fault can be diagnosed conveniently through the display content of the display module. And a communication module in the residual current protection device is convenient for the residual current protection device to communicate with external equipment. The power supply module in the residual current protection device can meet the power supply of the residual current protection device, so that under the condition that an external circuit is powered off, the residual current protection device can also normally operate, the residual current in the circuit to be detected can be continuously detected, and the purpose of protecting the circuit to be detected is achieved.
Optionally, for the residual current protection device, the residual current protection device further includes a processor 20, as shown in fig. 5, which is an exemplary schematic diagram of the structure of the processor 20, and the processor 20 may be a micro-control processor 20 having an ARM series Cortex-M3 core with a 32-bit processor 20 core. The power supply end of the processor 20 is connected to the power supply module 50, so that the power supply module 50 supplies power to the processor 20, and the forward voltage signal input end 201 of the processor 20 is connected to the output end of the residual current detection module 10, and is configured to receive the forward voltage signal transmitted by the residual current detection module 10, process the forward voltage signal to obtain a current value corresponding to each component, and determine whether to send an indication signal to the execution module 30 according to a processing result.
Optionally, the processor 20 is specifically configured to: analyzing the voltage signal to obtain the current value of each current component in the voltage signal; whether to send an indication signal to the execution module 30 is determined according to the current value of each current component and a preset current threshold.
Specifically, the processor 20 analyzes the voltage signal by: the processor 20 samples the forward voltage signal output from the filter circuit 1013 at a preset time period according to a preset sampling frequency, and performs a filtering algorithm on the sampled value to eliminate glitch interference, thereby improving the sampling accuracy. Then, the FFT algorithm analysis is performed on the obtained sampling data to obtain a current value of a dc component, a current value of an ac component, and a current value of a high frequency component in the residual current, and then it is determined whether to send the instruction signal to the execution module 30 according to the current values of the respective current components and a preset current threshold.
According to the residual current protection device provided by the embodiment of the application, the processor in the residual current protection device sets the current threshold value for comparing the current value of each component in the residual current, the detected voltage value can be quantized to a specific point, whether the detected residual current threatens a person or a household appliance is judged by comparing the detected voltage value with the threshold value, and the execution mechanism can prepare reliable actions to avoid unsafe accidents when the residual current is direct current, alternating current or high-frequency current.
Optionally, the different current component types correspond to respective current thresholds. Specifically, the dc component corresponds to a current threshold of the dc component, the ac component corresponds to a current threshold of the ac component, and the high frequency component corresponds to a current threshold of the high frequency component. When the processor 20 analyzes the current value of the dc component, the current value of the ac component, and the current value of the high frequency component in the residual current, the current values of the current components may be compared with corresponding preset current thresholds, and whether to send the indication signal to the execution module 30 is determined according to the comparison result.
The residual current protection device that this application embodiment provided, the treater among the above-mentioned residual current protection device sets up different threshold values for different components, because direct current component, alternating current component are different to the influence of the person or electrical apparatus respectively, set up different threshold values to different components and can have corresponding measure to the different components in the residual current that detects that have pertinence to the processing result that makes the treater produce is more accurate, in order to reach effectual residual current protection.
Optionally, the processor 20 is specifically configured to: acquiring the times that the voltage value of the current component continuously reaches a preset voltage threshold; whether to send an indication signal to the execution module 30 is determined according to the number of times and a preset number threshold.
Specifically, the processor 20 may further include a counting module, where the counting module is configured to count in a preset manner according to a comparison result obtained after comparing the voltage value of each current component with the corresponding preset voltage threshold, and may be configured to increment the counting module once according to a preset auto-increment value when the current value of the dc component is greater than the current threshold corresponding to the dc component; when the current value of the alternating current component is larger than the current threshold value corresponding to the alternating current component, the counting module is automatically increased once according to a preset self-increasing value; and when the current value of the high-frequency component is greater than the current threshold value corresponding to the high-frequency component, the counting module is automatically increased once according to a preset self-increasing value. Then, after a preset time period, the processor 20 obtains the number of times in the counting module, analyzes and compares the number of times with a preset number of times threshold, and determines whether to send an indication signal to the execution module 30 according to the comparison result.
Optionally, the processor 20 is specifically configured to: in case the number of times reaches a preset number threshold, the indication signal is sent to the execution module 30.
Specifically, after comparing the number obtained from the counting module with the number threshold, in the case that the counted number of the counting module is greater than or equal to the number threshold, the processor 20 sends an indication signal to the execution module 30, where the indication signal is used to control the execution module 30 to perform a corresponding action for achieving the purpose of residual current protection.
In the residual current protection device provided by the embodiment of the application, a processor in the residual current protection device analyzes the voltage signal, after the current value of each current component in the voltage signal is obtained, whether the indicating signal is sent to the execution module is determined by comparing the current value of each current component with a preset current threshold, and under the condition that the current value of each current component is greater than the current threshold, the number of times that the current value of each current component continuously reaches the current threshold is counted, and then whether the indicating signal is sent to the execution module is determined according to the comparison result of the number of times and the preset number threshold, the basis of judgment is further increased, the accuracy of judgment is improved, and a more reliable basis is provided for the protection of the residual current. The indication signal may be an off-port signal, and the off-port signal is used for controlling the execution module to execute the residual current protection action.
Optionally, the processor 20 is specifically configured to: the number of times is cleared after the instruction signal is sent to the execution module 30. Specifically, the processor 20 determines whether to send an indication signal to the execution module 30 according to a detection result after completing the detection of the residual current for a preset time period. In order not to affect the result of the detection of the residual current in the line to be detected in the next preset time period, the counting number of the counting module may be cleared after the detection of the residual current in the line to be detected in one preset time period is completed. The counting module may be cleared after the processor 20 sends the instruction signal to the execution module 30.
The residual current protection device that this application embodiment provided, count data in the count module is clear away to the treater among the above-mentioned residual current detection module, is convenient for detect the residual current in the circuit that awaits measuring in next preset time quantum, carries out new round of record to data through count module, avoids because remaining data produces the influence to new round of detection in the last round of testing process to make the testing result inaccurate, can not play effectual protection to the circuit that awaits measuring.
The above embodiments only express several implementation manners of the embodiments of the present application, and the descriptions are specific and detailed, but should not be construed as limiting the scope of the invention. It should be noted that, for those skilled in the art, variations and modifications can be made without departing from the concept of the embodiments of the present application, and these embodiments are within the scope of the present application. Therefore, the protection scope of the patent of the embodiment of the application shall be subject to the appended claims.
Claims (10)
1. A residual current protection device, characterized in that it comprises: the device comprises a residual current detection module, a processor and an execution module, wherein the residual current detection module comprises a fluxgate current sensor; the fluxgate current sensor is connected with the execution module through the processor and is in induction connection with a line to be tested;
the residual current detection module is used for sensing residual current of the line to be detected through the fluxgate current sensor, wherein the current component type of the residual current comprises a direct current component, an alternating current component and a high-frequency component;
the processor is used for processing the voltage signal according to the type of the current component after the residual current detection module converts the residual current into the voltage signal, and judging whether to send an indication signal to the execution module according to a processing result;
the execution module is used for protecting the line to be tested according to the indication signal;
the processor is further configured to analyze the voltage signal to obtain a current value of each current component in the voltage signal and a preset current threshold corresponding to each current component; acquiring the times that the current value of the current component continuously reaches a corresponding preset current threshold; and determining whether to send the indication signal to the execution module according to the times and a preset time threshold.
2. The apparatus of claim 1, wherein the processor further comprises:
and the counting module is used for counting according to a preset mode according to a comparison result obtained after the voltage value of each current component is compared with the corresponding preset voltage threshold, analyzing and comparing the times with a preset time threshold, and determining whether to send an indication signal to the execution module according to the comparison result.
3. The apparatus of claim 1, wherein the processor is specifically configured to:
and sending the indication signal to the execution module under the condition that the times reach a preset time threshold.
4. The apparatus according to any of claims 1-3, wherein the processor is specifically configured to:
and after the indication signal is sent to the execution module, clearing the times.
5. The apparatus of claim 1, wherein different current component types correspond to respective current thresholds.
6. The device according to any one of claims 1 to 5, wherein the residual current detection module further comprises a regulating circuit and a filter circuit, and the fluxgate current sensor is electrically connected with the filter circuit through the regulating circuit;
the regulating circuit is used for converting the residual current into a forward voltage signal;
and the filter circuit is used for filtering noise voltage signals in the forward voltage signals.
7. The device according to any one of claims 1-5, wherein the execution module comprises a driving circuit and an execution mechanism, and the execution mechanism is connected with the processor through the driving circuit;
the driving circuit is used for receiving the indication signal and driving the actuating mechanism according to the indication signal;
and the actuating mechanism is used for protecting the line to be tested under the driving of the driving circuit.
8. The device of any one of claims 1-5, further comprising a display module, a communication module, and a power module, wherein the display module, the communication module, and the power module are all electrically connected to the processor.
9. The apparatus of claim 8,
the display module is used for displaying the current values of the components processed by the processor and the working states of the modules;
the communication module is used for the processor to transmit data with other devices needing to communicate;
the power supply module is used for supplying power to the residual current protection device.
10. The apparatus of claim 1, wherein the fluxgate current sensor is configured to sense the residual current by superimposing a first magnetic field generated by the fluxgate current sensor and a second magnetic field generated by the residual current.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011396515.XA CN112736835B (en) | 2020-12-03 | 2020-12-03 | Residual current protection device |
Applications Claiming Priority (1)
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2015139655A1 (en) * | 2014-03-21 | 2015-09-24 | 上海电科电器科技有限公司 | Residual current protection device |
| CN207184035U (en) * | 2017-09-27 | 2018-04-03 | 杭州之江开关股份有限公司 | A kind of total current responsive type Aftercurrent protecting equipment |
| CN110763903A (en) * | 2019-11-20 | 2020-02-07 | 国网信息通信产业集团有限公司 | Residual current detection method, device and circuit |
| CN210071931U (en) * | 2019-04-01 | 2020-02-14 | 江阴信邦电子有限公司 | Automatic detection device for B-type residual current size and type |
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| CN108432086A (en) * | 2015-09-28 | 2018-08-21 | 淡马锡理工学院 | Equipment, system and method for energy management |
| CN110190581B (en) * | 2019-06-04 | 2021-11-23 | 上海良信电器股份有限公司 | Residual current protection device and method of circuit breaker |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015139655A1 (en) * | 2014-03-21 | 2015-09-24 | 上海电科电器科技有限公司 | Residual current protection device |
| CN207184035U (en) * | 2017-09-27 | 2018-04-03 | 杭州之江开关股份有限公司 | A kind of total current responsive type Aftercurrent protecting equipment |
| CN210071931U (en) * | 2019-04-01 | 2020-02-14 | 江阴信邦电子有限公司 | Automatic detection device for B-type residual current size and type |
| CN110763903A (en) * | 2019-11-20 | 2020-02-07 | 国网信息通信产业集团有限公司 | Residual current detection method, device and circuit |
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