CN112748321A - Testing device for residual current protection device - Google Patents
Testing device for residual current protection device Download PDFInfo
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- CN112748321A CN112748321A CN202011400417.9A CN202011400417A CN112748321A CN 112748321 A CN112748321 A CN 112748321A CN 202011400417 A CN202011400417 A CN 202011400417A CN 112748321 A CN112748321 A CN 112748321A
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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Abstract
The application relates to a testing device of a residual current protection device. The device includes: the device comprises a test current generation module, a processor in a residual current protection device and a fluxgate current sensor in the residual current protection device; the processor is electrically connected with the fluxgate current sensor through the test current generation module; the processor is used for generating different types of analog voltage signals and controlling the on-off of the test current generation module and the fluxgate current sensor; the analog voltage signal comprises any one of a direct current voltage signal, an alternating current voltage signal and a high-frequency voltage signal; the test current generation module is used for generating a test current signal according to the analog voltage signal; the test current signal is used for simulating a residual current signal in a circuit to be tested, which is connected with the residual current protection device; and the fluxgate current sensor is used for sensing the test current signal and transmitting the test current signal to the processor. The device is easy to operate, good in safety and capable of saving resources.
Description
Technical Field
The application relates to the technical field of circuit detection, in particular to a testing device of a residual current protection device.
Background
With the implementation of national energy-saving and emission-reducing policies, facilities such as photovoltaic, energy storage and electric vehicles are largely connected to a power distribution network, and municipal and residential facilities such as street lamps, traffic lights and direct-current variable frequency air conditioners are widely used, so that typical charges of various scenes show a rising trend of direct current. With the wide application of power electronic technology in a direct current system, the application environment of residual current is more and more complex, but the residual current can cause personal electric shock, power supply equipment damage and even fire, thereby causing personal injury and death and economic loss. Therefore, the testing device tests whether the residual current protection device can work normally or not, and has important significance for preventing personal casualties and economic losses caused by residual current.
At present, whether the equipment that the test residual current protection device can normally work and apply, its on-the-spot wiring is complicated, and the test mode is complicated, lacks effectual protection mechanism, needs manual operation to get the electricity from dedicated test equipment directly sometimes, loads the electric current of taking out to the residual current protection device in to carry out the test of residual current protection device, this kind of test device has great potential safety hazard.
Disclosure of Invention
In view of the above, it is necessary to provide a testing device capable of providing a residual current protection device in response to the above-mentioned technical problems.
A device for testing a residual current protection device, the device comprising:
the device comprises a test current generation module, a processor in a residual current protection device and a fluxgate current sensor in the residual current protection device; the processor is electrically connected with the fluxgate current sensor through the test current generation module;
the processor is used for generating different types of analog voltage signals and controlling the on-off of the test current generation module and the fluxgate current sensor; the analog voltage signal comprises any one of a direct current voltage signal, an alternating current voltage signal and a high-frequency voltage signal;
the test current generation module is used for generating a test current signal according to the analog voltage signal; the test current signal is used for simulating a residual current signal in a circuit to be tested, which is connected with the residual current protection device;
and the fluxgate current sensor is used for sensing the test current signal and transmitting the test current signal to the processor.
In one embodiment, the test current generation module comprises: the processor is electrically connected with the switching circuit through the power amplifier circuit, and the switching circuit can be connected with the fluxgate current sensor in an on-off manner;
the power amplifier circuit is used for converting the voltage signal into a test current signal;
and the switching circuit is used for switching on or off the fluxgate current sensor under the control of the processor.
In one embodiment, the analog voltage signal is a dc voltage signal.
In one embodiment, if the analog voltage signal is an ac voltage signal or a high-frequency ac voltage signal, the test current generation module further includes: the signal superposition circuit is connected with the power amplification circuit through the processor;
and the signal superposition circuit is used for generating an auxiliary voltage signal and superposing the auxiliary voltage signal and the analog voltage signal to form a test voltage signal.
In one embodiment, the apparatus further comprises: the upper computer is in communication connection with the processor through the communication module;
the upper computer is used for sending a control instruction to the processor through the communication module;
the processor is also used for controlling whether the processor enters a test mode or not according to the control instruction; in the test mode, the processor generates different types of analog voltage signals and controls the on-off of the test current generation module and the fluxgate current sensor.
In one embodiment, the fluxgate current sensor is connected with the input end of the filter circuit through the adjusting circuit, and the output end of the filter circuit is connected with the processor;
the regulating circuit is used for converting the test current signal into a test forward voltage signal;
the filter circuit is used for filtering noise voltage signals in the test forward voltage signals;
and the processor is also used for comparing the analog voltage signal with the test forward voltage signal of the noise-filtered voltage signal and determining the performance of the residual current protection device according to the comparison result.
In one embodiment, the apparatus further comprises: the execution mechanism is connected with the processor through the driving circuit;
the driving circuit is used for receiving the indication signal sent by the processor and driving the actuating mechanism according to the indication signal;
and the actuating mechanism is used for performing residual current protection on the circuit to be tested under the driving of the driving circuit.
In one embodiment, the apparatus further comprises: the display module and the power supply module are electrically connected with the processor.
In one embodiment, the signal superimposing circuit includes: the circuit comprises a voltage stabilizing circuit, a first operational amplifier chip, a first resistor, a second resistor, a third resistor and a fourth resistor;
the analog voltage signal output end of the processor is connected with the non-inverting input end of the first operational amplifier through a first resistor, the output end of the voltage stabilizing circuit is connected with the inverting input end of the first operational amplifier through a second resistor and the output end of the first operational amplifier through a third resistor, and the output end of the first operational amplifier chip is connected with the power amplifier circuit; the first resistor is grounded through the fourth resistor.
In one embodiment, the power amplification circuit comprises a power amplification chip, a fifth resistor, a capacitor, a sixth resistor and a seventh resistor;
the output end of the first operational amplifier is connected with the first input end of the power amplifier through a fifth resistor, the second input end of the power amplifier is grounded through a sixth resistor, the fifth resistor is grounded through a capacitor, and the seventh resistor is connected with the second input end of the power amplifier and the output end of the power amplifier.
In one embodiment, the switching circuit includes: the circuit comprises a relay, an eighth resistor, a voltage regulator tube, a ninth resistor and a triode;
the output end of the processor for controlling on-off signals is respectively connected with the input end of the voltage-regulator tube and the base electrode of the triode, the emitting electrode of the triode is grounded, the pole electrode of the triode is connected with the ninth resistor through one end of the relay, and the output end of the voltage-regulator tube is connected with the ninth resistor; the other end of the relay is connected with the fluxgate current sensor.
The test device of the residual current protection device comprises: the device comprises a test current generation module, a processor in a residual current protection device and a fluxgate current sensor; the processor is electrically connected with the fluxgate current sensor through the test current generation module; the processor can generate analog voltage signals of different types, and the test current generation module is controlled to be communicated with the fluxgate current sensor in the test mode, so that the fluxgate current sensor can sense the test current signal and transmit the test current signal to the processor after the test current generation module generates the test current signal according to the analog voltage signal. Because the processor can produce and output different types of analog voltage signals, the test current generation module can generate the test current for simulating the residual current in the circuit to be tested in the real working environment, so that the test current signal sensed by the fluxgate current sensor can be equivalent to the real residual current signal in the circuit to be tested, the direct power taking from special test equipment is not needed, and the safety of the test can be ensured on the basis of well utilizing the existing resources. In addition, the processor can also judge the performance of the residual current protection device according to the consistency of the comparison output voltage signal and the comparison input voltage signal, and a complex judging process is not needed, so that the operability of the testing device is strong; furthermore, the fluxgate current sensor in the testing device can induce the direct current component, the alternating current component and the high frequency component in the test current by using the self inductive characteristic, so as to restore the test current to the maximum extent, improve the detection precision of the test current signal, improve the detection accuracy and efficiency of the test current, and provide a reliable basis for judging the performance of the residual current protection device. In summary, the test device provided by the embodiment of the application utilizes the existing residual current protection device to simulate the test current so as to detect the performance of the residual current protection device, fully utilizes the existing resources, and has the advantages of simple structure, easy operation and good safety.
Drawings
FIG. 1 is a schematic structural diagram of a testing device of a residual current protection device in one embodiment;
FIG. 2 is a schematic structural diagram of a testing device of a residual current protection device in another embodiment;
FIG. 3 is a schematic diagram of a circuit configuration of a test current generation module in one embodiment;
FIG. 4 is a schematic structural diagram of a testing device of a residual current protection device in another embodiment;
FIG. 5 is a schematic diagram of a circuit configuration of a test current generation module in another embodiment;
FIG. 6 is a schematic structural diagram of a testing device of a residual current protection device in another embodiment;
FIG. 7 is a block diagram of the circuit connections of the conditioning circuit and the filtering circuit in another embodiment;
fig. 8 is a test flow chart of a testing device of the residual current protection device.
Description of reference numerals:
10. a test current generation module; 101. A signal superimposing circuit;
1011. a voltage stabilizing circuit; 1012. A first operational amplifier chip;
1013. a first resistor; 1014. A second resistor;
1015. a third resistor; 1016. A fourth resistor;
102. a power amplifier circuit; 1021. A power amplifier chip;
1022. a fifth resistor; 1023. A capacitor;
1024. a sixth resistor; 1025. A seventh resistor;
1031. a relay; 1032. An eighth resistor;
1033. a voltage stabilizing tube; 1034. A ninth resistor;
1035. a triode; 103. A switching circuit;
20. a processor; 30. A fluxgate current sensor;
40. a regulating circuit; 50. A filter circuit; 60. A communication module;
70. a drive circuit; 80. An actuator; 90. A power supply module;
100. a display module; 200. And (4) an upper computer.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
The residual current protection device is an effective device for preventing personal electric shock, fire and electrical equipment damage, so that the residual current protection device can work normally and has great influence on actual production and life. For this purpose, the residual current protection device needs to be periodically detected to judge the performance of the residual current protection device according to the detection result, so as to better protect the residual current.
Fig. 1 is a schematic structural diagram of a testing device of a residual current protection device provided in the present application, and as shown in fig. 1, the testing device includes: the test current generation module 10, the processor 20 in the residual current protection device and the fluxgate current sensor 30 in the residual current protection device; wherein, the processor 20 is electrically connected with the fluxgate current sensor 30 through the test current generation module 10; the processor 20 is used for generating different types of analog voltage signals and controlling the on-off of the test current generation module 10 and the fluxgate current sensor 30; the analog voltage signal comprises any one of a direct current voltage signal, an alternating current voltage signal and a high-frequency voltage signal; the test current generation module 10 is used for generating a test current signal according to the analog voltage signal; the test current signal is used for simulating a residual current signal in a circuit to be tested, which is connected with the residual current protection device; a fluxgate current sensor 30 for sensing the test current signal and transmitting the test current signal to the processor 20.
Specifically, the test device of the residual current protection device provided in the embodiment of the present application may be an indication signal according to other external devices, optionally, the external device may be the upper computer 200, after the upper computer 200 establishes a communication connection with the processor 20, an indication signal is sent to the processor 20 to control the processor 20 to start the test mode, and meanwhile, the processor 20 controls the test current generation module 10 to turn on the fluxgate current sensor 30 according to the indication signal. After the test mode is started, the processor 20 in the residual current protection device can generate a preset current signal and convert the preset current signal into an analog voltage signal according to the magnitude of the preset current signal for outputting, and optionally, the processor 20 may be configured to generate analog voltage signals of different types, where the analog voltage signal may be one of a direct current voltage signal, an alternating current voltage signal or a high-frequency voltage signal, and is configured to simulate a direct current component, an alternating current component and a high-frequency component in the residual current of the real line to be tested.
After the processor 20 generates the analog voltage signal, the output terminal of the processor 20 is connected to the input terminal of the test current generating module 10. Therefore, the analog voltage signal output by the output terminal of the processor 20 is received by the test current generating module 10, and then the test current generating module 10 processes the received analog voltage signal to obtain a test current signal.
Based on the generation of the test current signal, the test current generation module 10 and the fluxgate current sensor 30 may be connected on and off. At this time, the test device is in the test mode, and the test current generation module 10 and the fluxgate current sensor 30 are in the on state, so that the test current signal output by the test current generation module 10 can be induced by the fluxgate current sensor 30. When the fluxgate current sensor 30 senses the test current signal, the test current signal is transmitted to the processor 20 again, so that the processor 20 performs corresponding processing, and finally, the performance of the residual current protection device is judged according to the processed result.
During specific induction, the fluxgate current sensor 30 may include an auxiliary test coil and a sensor, the auxiliary test coil is wound around a coil of the sensor, when the residual current protection device is tested, a current transmitted to the auxiliary test coil by the test current generation module 10 may be equivalent to a residual current on a bus in a working mode of the residual current protection device, and the sensor may induce a waveform and a magnitude of the test current flowing through the auxiliary test coil. The sensor may sense direct current, alternating current, and high frequency current, which may be below 10KHZ high frequency current.
Optionally, the processing of the processor 20 to the test current may be that the processor 20 samples the test current signal according to a preset sampling frequency, until the processor 20 completes a specified sampling period on the test current signal, the processor 20 performs an algorithm analysis on the sampled data, where the algorithm analysis may be performing FFT calculation on the sampled data, and then obtaining a current value corresponding to the dc component, a current value corresponding to the ac component, and a current value corresponding to the high-frequency component, comparing the obtained current values corresponding to the components with a current value output by the processor, and determining the performance of the residual current protection device according to the comparison result. For example, when the comparison result is consistent, or the error range of the comparison result is between 3% and 5%, it is determined that the residual current protection device has good performance, can normally operate, and can protect the residual current in the line.
The application embodiment provides a residual current protection device's test device includes: the device comprises a test current generation module, a processor in a residual current protection device and a fluxgate current sensor; the processor is electrically connected with the fluxgate current sensor through the test current generation module; the processor can generate analog voltage signals of different types, and the test current generation module is controlled to be communicated with the fluxgate current sensor in the test mode, so that the fluxgate current sensor can sense the test current signal and transmit the test current signal to the processor after the test current generation module generates the test current signal according to the analog voltage signal. Because the processor can produce and output different types of analog voltage signals, the test current generation module can generate the test current for simulating the residual current in the circuit to be tested in the real working environment, so that the test current signal sensed by the fluxgate current sensor can be equivalent to the real residual current signal in the circuit to be tested, the direct power taking from special test equipment is not needed, and the safety of the test can be ensured on the basis of well utilizing the existing resources. In addition, the processor can also judge the performance of the residual current protection device according to the consistency of the comparison output voltage signal and the comparison input voltage signal, and a complex judging process is not needed, so that the operability of the testing device is strong; furthermore, the fluxgate current sensor in the testing device can induce the direct current component, the alternating current component and the high frequency component in the test current by using the self inductive characteristic, so as to restore the test current to the maximum extent, improve the detection precision of the test current signal, improve the detection accuracy and efficiency of the test current, and provide a reliable basis for judging the performance of the residual current protection device. In summary, the test device provided by the embodiment of the application utilizes the existing residual current protection device to simulate the test current so as to detect the performance of the residual current protection device, fully utilizes the existing resources, and has the advantages of simple structure, easy operation and good safety.
Fig. 2 is a schematic structural diagram of a testing apparatus of a residual current protection device according to another embodiment of the present application, and as shown in fig. 2, when an analog voltage signal output by a processor 20 is a dc voltage signal, the test current generation module 10 includes: the power amplifier circuit 102 and the switching circuit 103, the processor 20 is electrically connected with the switching circuit 103 through the power amplifier circuit 102, and the switching circuit 103 can be connected with the fluxgate current sensor 30 in a switching mode; the power amplifier circuit 102 is used for converting the voltage signal into a test current signal; and a switching circuit 103 for switching on or off the fluxgate current sensor 30 under the control of the processor 20.
Specifically, the analog voltage signal output by the processor 20 is transmitted to the power amplifier circuit 102, the power amplifier circuit 102 converts the analog voltage signal into a test current signal, and the circuit for converting the voltage signal into the current signal may have various circuit designs, for example, the circuit may be a circuit that is formed by combining components such as a rectifier diode, a reactance component, a capacitor, a resistor, and a zener diode in a certain connection manner to convert voltage into current. The voltage-current conversion circuit can also be a voltage-current conversion circuit which is formed by combining voltage stabilizing diodes, capacitors, resistors and other components according to a certain mode and is required by tests. The specific form of the power amplifier circuit 102 is not limited, as long as the analog voltage signal can be converted into the test current signal. Under the condition that the residual current protection device is in the test mode, after the processor 20 receives an indication signal of an external device, the test current generation module 10 is controlled to be connected with the fluxgate current sensor 30, specifically, the switching circuit 103 is controlled to be connected with the fluxgate current sensor 30, so that the test current generated by the power amplifier circuit 102 is transmitted to the auxiliary test coil of the fluxgate current sensor 30 through the switching circuit 103 to be sensed by the fluxgate current sensor 30.
In an optional embodiment, as shown in fig. 3, a circuit structure diagram of the test current generation module 10 provided in the embodiment of the present application is provided, where the circuit structure diagram includes a power amplifier circuit 102, and the power amplifier circuit 102 includes a power amplifier chip 1021, a fifth resistor 1022, a capacitor 1023, a sixth resistor 1024, and a seventh resistor 1025; an output terminal of the processor 20 is connected to a first input terminal of the power amplifier chip 1021 through a fifth resistor 1022, a second input terminal of the power amplifier chip 1021 is grounded through a sixth resistor 1024, the fifth resistor 1022 is grounded through a capacitor 1023, and a seventh resistor 1025 is connected to the second input terminal of the power amplifier chip 1021 and the output terminal of the power amplifier chip 1021.
The circuit structure diagram further includes a switching circuit 103, and the switching circuit 103 includes: relay 1031, eighth resistor 1032, voltage regulator 1033, ninth resistor 1034 and triode 1035; the output end of the processor 20 for controlling the on-off signal is respectively connected with the input end of the voltage regulator tube 1033 and the base electrode of the triode 1035, the emitter electrode of the triode 1035 is grounded, the pole electrode of the triode 1035 is connected with the ninth resistor through one end of the relay 1031, and the output end of the voltage regulator tube 1033 is connected with the ninth resistor; the other end of the relay 1031 is connected to the fluxgate current sensor 30.
Specifically, in a case where the analog voltage signal output by the processor 20 is a dc voltage signal, the output terminal of the processor 20 may be connected to the input terminal of the power amplifier circuit 102 through the fifth resistor 1022, so as to connect the analog voltage signal to the power amplifier circuit 102, and the analog voltage signal is processed by the power amplifier chip 1021 to obtain a test current signal. After the processor 20 receives an instruction for entering a test mode, a signal is sent to the switching circuit 103 through an output end for controlling an on-off signal, the switching circuit 103 is controlled to switch on the fluxgate current sensor 30, so that a test current signal generated by the power amplifier circuit 102 is transmitted to an auxiliary test coil of the fluxgate current sensor 30 through the switching circuit 103, the fluxgate current sensor 30 can sense the test current signal on the auxiliary test coil, the switching circuit 103 can also control the switching circuit 103 to disconnect the auxiliary coil in the fluxgate current sensor 30 according to the indication signal after the processor 20 receives an indication signal for entering a working mode, the processor 20 cannot generate an analog voltage signal, and the residual current protection device enters the working mode.
The test device of residual current protection device that this application embodiment provided, power amplifier circuit simple structure among this test device, the wiring between the components and parts is uncomplicated, can convert analog voltage signal to test current signal, is suitable for fluxgate current sensor to respond to, reaches the effect of simulating residual current in the real circuit that awaits measuring. Simultaneously, the switching circuit can switch the testing device between operating mode and test mode, and reasonable utilization and allocation resource for this testing device not only can detect residual current protection device's performance, can also be arranged in normal residual current protection circuit, need not design a testing device alone and carry out the measuring of performance to residual current protection device, the effectual resource of having practiced thrift.
Fig. 4 is a schematic structural diagram of a testing apparatus of a residual current protection device according to another embodiment of the present application, and as shown in fig. 4, an analog voltage signal in the embodiment of the present application is an ac voltage signal or a high-frequency ac voltage signal, and in order to be able to sense the two types of voltage signals, on the basis of the above embodiment, the test current generation module further includes: and the signal superposition circuit 101, and the processor are connected with the power amplifier circuit 102 through the signal superposition circuit 101. And a signal superposition circuit 101 for generating an auxiliary voltage signal and superposing the auxiliary voltage signal and the analog voltage signal to form a test voltage signal.
Specifically, the processor 20 outputs a positive voltage signal, but the ac component in the residual current may be a positive or negative square wave signal, a sine wave signal or a triangular wave signal, so that the positive analog voltage signal output by the processor 20 needs to be processed and converted into an analog ac voltage signal, thereby achieving the purpose of simulating the residual current in the real line to be tested. The process is realized by a signal superposition circuit 101, wherein one end of the signal superposition circuit 101 is connected with the output end of the processor 20, and the other end is connected with the input end of the power amplification circuit 102. The signal superimposing circuit 101 is configured to generate an auxiliary voltage signal, and superimpose the auxiliary voltage signal and the analog voltage signal to form a test voltage signal. The signal generated by the signal superposition circuit 101 may be a signal with different magnitude and opposite direction with the analog alternating current signal, and the two paths of signals are mutually superposed to form a positive waveform and a negative waveform so as to simulate the alternating current component and the high frequency component in the residual current. The test data are closer to the residual current in the real working scene, and performance detection is carried out on the residual current protection device better.
In an alternative embodiment, on the basis of the embodiment shown in fig. 3, as shown in fig. 5, a circuit diagram of the test current generating module 10 provided in the embodiment of the present application is shown, where the circuit diagram includes a signal superimposing circuit 101, and the signal superimposing circuit 101 includes: a voltage stabilizing circuit 1011, a first operational amplifier chip 1012, a first resistor 1013, a second resistor 1014, a third resistor 1015, and a fourth resistor 1016; an analog voltage signal output end of the processor 20 is connected with a non-inverting input end of the first operational amplifier chip 1012 through a first resistor 1013, an output end of the voltage stabilizing circuit is connected with an inverting input end of the first operational amplifier chip 1012 through a second resistor 1014, and is connected with an output end of the first operational amplifier chip 1012 through a third resistor 1014, and the output end of the first operational amplifier chip 1012 is connected with the power amplifier circuit 102; the first resistor 1013 is connected to ground through a fourth resistor 1016.
Specifically, the power supply terminal of the voltage stabilizing circuit 1011 is connected to the power supply terminal of the processor 20, and the voltage stabilizing circuit 1011 can adjust the magnitude of the power supply terminal input voltage by adjusting the magnitude of the resistor in the voltage stabilizing circuit 1011, so that the adjusted voltage is input to the non-inverting input terminal of the first operational amplifier chip 1012, and at the same time, the analog voltage signal output from the processor 20 is transmitted to the non-inverting input terminal of the first operational amplifier chip 1012 through the first resistor 1013. The first operational amplifier chip 1012 can perform operations such as addition, subtraction, multiplication, or division to superimpose the two voltage signals to output a test voltage signal that meets the test requirements. And transmits the test voltage signal to the power amplifier circuit 102 to be converted into a test current signal for testing the performance of the residual current protection device.
The test device of residual current protection device that this application embodiment provided is provided with the signal stack circuit among the test current generation module in this test device, and the signal stack circuit can become forward voltage signal processing has positive or negative voltage signal to alternating current component and high frequency component in the residual current simulate out, make test current and real residual current be close more, provide reliable data support for detecting residual current protection device's performance.
Fig. 6 is a schematic structural diagram of a testing device of a residual current protection device according to another embodiment of the present application, and as shown in fig. 6, the testing device of the residual current protection device further includes: host computer 200 and communication module 60, host computer 200 passes through communication module 60 and processor 20 communication connection. The upper computer 200 is configured to send a control instruction to the processor 20 through the communication module 60; the processor 20 is further used for controlling whether the processor 20 enters a test mode or not according to the control instruction; in the test mode, the processor 20 generates different types of analog voltage signals and controls the test current generation module and the fluxgate current sensor 30 to be turned on or off.
Optionally, the testing apparatus may further include a regulating circuit 40 and a filter circuit 50, the fluxgate current sensor 30 is connected to an input terminal of the filter circuit 50 through the regulating circuit 40, and an output terminal of the filter circuit 50 is connected to the processor 20; a regulating circuit 40 for converting the test current signal into a positive test voltage signal; the filter circuit 50 is used for filtering noise voltage signals in the forward test voltage signals; the processor 20 is further configured to compare the analog voltage signal with the forward test voltage signal of the noise-filtered voltage signal, and determine the performance of the residual current protection device according to the comparison result.
Optionally, the test device may further include: a drive circuit 70 and an actuator 80, the actuator 80 being connected to the processor 20 via the drive circuit 70; a driving circuit for receiving the indication signal sent by the processor 20 and driving the actuator 80 according to the indication signal; and the actuator 80 is used for performing residual current protection on the circuit to be tested under the driving of the driving circuit 70.
Optionally, the test device may further include: the display module 100 and the power supply module 90, and both the display module 100 and the power supply module 90 are electrically connected to the processor.
Specifically, the upper computer 200 sends a control instruction to the processor 20 through the communication module 60, and the control instruction is used for controlling the processor 20 to send a signal to the switching circuit 103 to control the switching circuit 103 to be connected with the fluxgate current sensor 30, so that the residual current protection device is switched to the test mode. Meanwhile, the processor 20 may also transmit the internally stored data to the upper computer 200 through the communication module 60 for the upper computer 200 to analyze and store.
The adjusting circuit 40 can convert a test current signal output from the fluxgate current sensor into a forward test voltage signal, the filter circuit 50 filters the forward test voltage signal output from the adjusting circuit 40 to eliminate noise in the forward test voltage signal, and then the forward test voltage signal of the noise voltage signal is filtered and transmitted to the processor, the processor 20 performs processing such as sampling of a preset frequency, FFT calculation and the like on the forward test voltage signal to obtain a current value corresponding to each component, compares the current value with the current value output by the processor 20, and determines the performance of the residual current protection device according to the comparison result. For example, when the comparison result is a consistent result, or the error range of the comparison result is between 3% and 5%, it is determined that the residual current protection device has good performance, can normally operate, and can protect the residual current in the line.
In another alternative embodiment, as shown in fig. 7, which is a block diagram of the circuit connection between the adjusting circuit 40 and the filtering circuit 50, the adjusting circuit 40 includes a voltage regulator circuit, an operational amplifier chip, 3 resistors and 2 capacitors, and the connection relationship is shown in fig. 4; the filter circuit 50 includes an operational amplifier chip, 3 resistors and 2 capacitors, and the connection relationship is shown in the figure.
In the specific protection process of the residual current, the testing device of the residual current protection device further includes a driving circuit 70 and an executing mechanism 80, the driving circuit 70 receives an indication signal sent by the processor 20, the indication signal may be a trip signal, and drives the executing mechanism according to the trip signal, and the executing mechanism executes a specific residual current protection operation.
The display module 100 is used for displaying the current values of the components processed by the processor 20 and the working states of the modules. The power supply module 90 is used for supplying power to the residual current protection device, and may be connected to the processor 20 only, and other modules are connected to the processor 20 to supply power to all modules, or may be connected to each module respectively to supply power to all modules.
The embodiment of the application provides a residual current protection device's test device, this test device's communication module be convenient for treater and outside equipment communication to carry out the transmission of data, realize the sharing of data, conveniently look up data at any time. Simultaneously, the host computer can realize carrying out remote operation, labour saving and time saving to this test device with communication module mutually supports. The test current signal after the conversion of the regulating circuit is more adaptive to the processor, so that the receiving and processing of the processor are facilitated, the efficiency of signal processing can be improved, and the efficiency of residual current detection is further improved. The filter circuit can filter the voltage signal output from the regulating circuit, and eliminate the interference of the noise voltage signal on the detected voltage signal, so as to ensure the accuracy of test current detection and provide reliable data support for the detection of the residual current protection device. The driving circuit drives the actuating mechanism to execute the residual current protection action according to the indication signal so as to achieve the purpose of residual current protection. The actuating mechanism can carry out the specific action of residual current protection, and this action can be the switch of being connected between disconnection equipment and the circuit to the separation residual current flows into equipment or people's health, protects equipment, can also avoid residual current to harm people's health simultaneously. The power supply module can get power from the bus and supply power for the test device. The display module is convenient for checking the detection result and the working state of each module in real time, and meanwhile, when the device breaks down, the display module is convenient for diagnosing the fault.
Fig. 8 is a test flow chart of a testing device of a residual current protection device according to an embodiment of the present application, and as shown in fig. 8, the test flow is as follows:
1. the upper computer sends an indication signal, and the processor switches the testing device to a testing mode to start a testing program of the residual current protection device after receiving the indication signal.
2. And the processor sends a control command, and closes a relay switch in the switching circuit to switch on the fluxgate current sensor.
3. The processor outputs a preset direct current signal, converts the preset direct current signal into an analog direct current voltage signal according to the magnitude of the preset direct current signal and outputs the analog direct current voltage signal, the analog direct current voltage signal is converted into a test direct current signal through the power amplifier circuit, the test direct current signal flows into an auxiliary test coil of the fluxgate current sensor through the switching circuit, the fluxgate current sensor can sense the test direct current signal on the auxiliary test coil, the test direct current signal is converted into a test direct current voltage signal through the regulating circuit, then a noise voltage signal in the test direct current voltage signal is filtered through the filter circuit, finally the test direct current voltage signal is transmitted to the processor, the processor obtains a current value corresponding to the test direct current voltage signal through sampling and FFT calculation, for example, the obtained direct current value is compared with the current value of the preset direct current signal, if the two numerical values are consistent, or the error range is between 3% and 5%, the processor can determine that the residual current protection device has good performance, can normally work, and can protect direct current residual current in a circuit.
4. A digital-to-analog conversion pin of the processor outputs a preset alternating current signal, the preset alternating current signal is converted into an analog alternating current voltage signal according to the magnitude of the preset alternating current signal and output, the forward analog alternating current voltage signal is converted into an analog alternating current voltage signal through the superposition of a signal superposition circuit, the analog alternating current voltage signal is converted into a test alternating current signal through a power amplification circuit, the test alternating current signal flows into an auxiliary test coil of the fluxgate current sensor through a switching circuit, the fluxgate current sensor can sense a test alternating current signal on the auxiliary test coil, the test alternating current signal is converted into a forward test alternating current voltage signal through a regulating circuit, a noise voltage signal in the forward test alternating current voltage signal is filtered through a wave filtering circuit, and finally the forward test alternating current voltage signal is transmitted to the processor, and the processor can be a sampling circuit, a sampling circuit or, The FFT calculates to obtain an alternating current value corresponding to the forward test alternating voltage signal, the alternating current value is compared with a current value of a preset alternating current signal, and if the two values are consistent or the error range is between 3% and 5%, the processor can determine that the residual current protection device is good in performance, can normally work and can protect alternating residual current in a circuit.
5. A digital-to-analog conversion pin of the processor outputs a preset high-frequency alternating current signal, the preset high-frequency alternating current signal is converted into an analog high-frequency alternating current voltage signal according to the magnitude of the preset high-frequency alternating current signal and is output, the forward analog high-frequency alternating current voltage signal is converted into an analog high-frequency alternating current voltage signal through the superposition of a signal superposition circuit, the analog high-frequency alternating current voltage signal is converted into a test high-frequency alternating current signal through a power amplification circuit, the test high-frequency alternating current signal flows into an auxiliary test coil of a fluxgate current sensor through a switching circuit, the fluxgate current sensor can sense the test high-frequency alternating current signal on the auxiliary test coil, the test high-frequency alternating current signal is converted into a forward test high-frequency alternating current voltage signal through a regulating circuit, a filter circuit filters a noise voltage signal in the forward test high-frequency alternating, the processor obtains a high-frequency alternating current value corresponding to the forward test high-frequency alternating current voltage signal through sampling and FFT calculation, the high-frequency alternating current value is compared with a current value of a preset high-frequency alternating current signal, and if the high-frequency alternating current value and the preset high-frequency alternating current signal are consistent in numerical value or the error range is between 3% and 5%, the processor can determine that the residual current protection device is good in performance, can normally work, and can protect high-frequency alternating current in a circuit.
6. After the test is finished, the processor sends an indication signal to the switching circuit to control the switching circuit to be disconnected with the fluxgate sensor.
7. And after the processor determines that the residual current protection device has good performance, sending an indication signal to the driving circuit to drive the actuating mechanism to execute the operation of disconnecting the bus, and finishing the test. And if the voltage values of the two are inconsistent, the processor does not send a tripping signal to the driving mechanism, and the test is also finished.
8. And after the test is finished, the processor transmits the data to the upper computer through the communication module.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above examples only show some embodiments of the present application, and the description thereof is specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for those skilled in the art, without departing from the concept of the present application, several variations and modifications can be made, which are within the scope of the embodiments of the present application. Therefore, the protection scope of the embodiments of the present application shall be subject to the appended claims.
Claims (11)
1. A device for testing a residual current protection device, said device comprising: the device comprises a test current generation module, a processor in the residual current protection device and a fluxgate current sensor in the residual current protection device; the processor is electrically connected with the fluxgate current sensor through the test current generation module;
the processor is used for generating different types of analog voltage signals and controlling the on-off of the test current generation module and the fluxgate current sensor; the analog voltage signal comprises any one of a direct current voltage signal, an alternating current voltage signal and a high-frequency voltage signal;
the test current generation module is used for generating a test current signal according to the analog voltage signal; the test current signal is used for simulating a residual current signal in a circuit to be tested, which is connected with the residual current protection device;
the fluxgate current sensor is used for sensing the test current signal and transmitting the test current signal to the processor.
2. The test device of claim 1, wherein the test current generation module comprises: the processor is electrically connected with the switching circuit through the power amplifier circuit, and the switching circuit can be connected with the fluxgate current sensor in an on-off manner;
the power amplifier circuit is used for converting the voltage signal into a test current signal;
the switching circuit is used for switching on or off the fluxgate current sensor under the control of the processor.
3. The test device of claim 2, wherein the analog voltage signal is a direct current voltage signal.
4. The testing device of claim 2, wherein if the analog voltage signal is an ac voltage signal or a high frequency ac voltage signal, the test current generation module further comprises: the processor is connected with the power amplification circuit through the signal superposition circuit;
the signal superposition circuit is used for generating an auxiliary voltage signal and superposing the auxiliary voltage signal and the analog voltage signal to form a test voltage signal.
5. The test device of any one of claims 1-4, wherein the device further comprises: the upper computer is in communication connection with the processor through the communication module;
the upper computer is used for sending a control instruction to the processor through the communication module;
the processor is further used for controlling whether the processor enters a test mode or not according to the control instruction; and in the test mode, the processor generates different types of analog voltage signals and controls the on-off of the test current generation module and the fluxgate current sensor.
6. The testing device of claim 5, further comprising: the fluxgate current sensor is connected with the input end of the filter circuit through the adjusting circuit, and the output end of the filter circuit is connected with the processor;
the regulating circuit is used for converting the test current signal into a forward test voltage signal;
the filter circuit is used for filtering noise voltage signals in the forward test voltage signals;
the processor is further configured to compare the analog voltage signal with a forward test voltage signal of the noise-filtered voltage signal, and determine the performance of the residual current protection device according to a comparison result.
7. The testing device of claim 6, further comprising: the execution mechanism is connected with the processor through the driving circuit;
the driving circuit is used for receiving an indication signal sent by the processor and driving the actuating mechanism according to the indication signal;
and the actuating mechanism is used for performing residual current protection on the circuit to be tested under the driving of the driving circuit.
8. The testing device of claim 7, further comprising: the display module and the power supply module are electrically connected with the processor.
9. The test device of claim 4, wherein the signal superimposing circuit comprises: the circuit comprises a voltage stabilizing circuit, a first operational amplifier chip, a first resistor, a second resistor, a third resistor and a fourth resistor;
the analog voltage signal output end of the processor is connected with the non-inverting input end of the first operational amplifier through the first resistor, the output end of the voltage stabilizing circuit is connected with the inverting input end of the first operational amplifier through the second resistor and is connected with the output end of the first operational amplifier through the third resistor, and the output end of the first operational amplifier chip is connected with the power amplifier circuit; the first resistor is grounded through the fourth resistor.
10. The test device of claim 9, wherein the power amplifier circuit comprises a power amplifier chip, a fifth resistor, a capacitor, a sixth resistor and a seventh resistor;
the output end of the processor is connected with the first input end of the power amplifier through the fifth resistor, the second input end of the power amplifier is grounded through the sixth resistor, the fifth resistor is grounded through the capacitor, and the seventh resistor is connected with the second input end of the power amplifier and the output end of the power amplifier.
11. The test device of claim 10, wherein the switching circuit comprises: the circuit comprises a relay, an eighth resistor, a voltage regulator tube, a ninth resistor and a triode;
the output end of the processor for controlling on-off signals is respectively connected with the input end of the voltage-stabilizing tube and the base electrode of the triode, the emitting electrode of the triode is grounded, the pole electrode of the triode is connected with the ninth resistor through one end of the relay, and the output end of the voltage-stabilizing tube is connected with the ninth resistor; the other end of the relay is connected with the fluxgate current sensor.
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