CN111693800A - Action characteristic test method and circuit of leakage protection action device - Google Patents
Action characteristic test method and circuit of leakage protection action device Download PDFInfo
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Abstract
The invention discloses an action characteristic test method and a test circuit of a leakage protection action device, wherein the method is applied to the test circuit and comprises the following steps: generating sine residual current and harmonic residual current in the main loop through the control loop so as to respectively act the sine residual current and the harmonic residual current on the electric leakage protection device; in the process that the sine residual current acts on the electric leakage protection device, measuring a first residual action current and action occurrence time of the electric leakage protection device to obtain a relation between the frequency of the first residual action current and the frequency of the sine residual current; and in the process that the harmonic residual current acts on the electric leakage protection device, whether the electric shock accident occurs or not is judged by measuring the effective value of the residual action current of the electric leakage protection device in a plurality of preset periods. The invention can effectively prevent the occurrence of the operation failure/misoperation of the low-voltage 400V leakage protection device and improve the safety and reliability of the production electricity utilization of the 400V low-voltage system.
Description
Technical Field
The present invention relates to the field of power systems, and in particular, to a method and a circuit for testing operating characteristics of an earth leakage protection operating device.
Background
With the continuous increase of the electricity consumption, the personal electric shock accidents are more frequent. In the human electric shock accidents, a large part of accidents are caused by low-voltage 400V electric shock, and the inventor shows that the conventional 400V electric leakage protection action device frequently has the phenomena of misoperation, refusal action and the like through field actual operation, thereby bringing great threat to safety production power utilization.
Aiming at the problem of human body electric shock of low voltage 400V, human body electric shock current waveform tests are carried out at present, and a method for extracting human body electric shock voltage and current is provided. However, this method is difficult to be applied to practice, and the cause of the operation rejection/malfunction of the conventional earth leakage protection device or other devices is uncertain, so that the operation rejection/malfunction of the low-voltage 400V earth leakage protection device cannot be prevented.
Disclosure of Invention
The present application is proposed to solve the above-mentioned technical problems. The embodiment of the application provides an action characteristic test method and a test circuit of an electric leakage protection action device, which can effectively prevent the occurrence of the operation refusing/misoperation of a low-voltage 400V electric leakage protection device, improve the safety and reliability of the production electricity utilization of a 400V low-voltage system, and have the advantages of simple test method, good economy and strong practicability.
According to an aspect of the present application, there is provided an operation characteristic test method of an earth leakage protection operation device, the method being applied to a test circuit including: a main loop and a control circuit; the method comprises the following steps: generating a sine residual current and a harmonic residual current in the main loop through the control loop so as to respectively act on the leakage protection device in the main loop; measuring a first residual action current and action occurrence time of the electric leakage protection device in the process that the sinusoidal residual current acts on the electric leakage protection device to obtain a relation between the frequency of the sinusoidal residual current and the first residual action current; wherein the first residual action current is caused by the sinusoidal residual current; and in the process of acting the harmonic residual current on the electric leakage protection device, judging whether an electric shock accident occurs or not by measuring the effective value of the residual action current of the electric leakage protection device in a plurality of preset periods.
Further, the step of measuring a first residual action current and an occurrence time of an action of the earth leakage protection device to obtain a relationship between the first residual action current and a frequency of the sinusoidal residual current includes: measuring the first residual action current and the action occurrence time of the leakage protection device through a Rogowski coil and an oscilloscope to obtain the first residual action current and the action time; the first residual action current is residual action current with different amplitudes of the electric leakage protection device under the action of the sinusoidal residual current with different frequencies; determining a relationship between the first residual action current and a frequency of the sinusoidal residual current based on the first residual action current, the action time, and the sinusoidal residual current of different frequencies.
Further, the relationship between the first residual action current and the residual current frequency is:
wherein I represents the first residual operating current, I0And (c) a frequency representing a rated residual operating current of the earth leakage protection operating device, f representing a frequency of the sinusoidal residual current, and A, B, C being constants.
Further, the step of determining whether an electric shock accident occurs by measuring the effective value of the residual operating current of the earth leakage protection device in a plurality of preset periods includes: measuring a second residual action current of the earth leakage protection device; wherein the second residual action current is caused by the harmonic residual current; determining the effective value of the residual action current according to the second residual action current in a plurality of preset periods; and when the effective value of the residual action current is greater than a preset current threshold value, determining that an electric shock accident occurs.
Further, the control loop comprises: the signal source is electrically connected with the input end of the inverter, and the output end of the inverter is electrically connected with the secondary side of the leakage protection device through the second current-limiting resistor; the method further comprises the following steps: comparing the triangular carrier wave with sinusoidal modulation waves with different frequencies through the signal source to obtain a first switching signal of the inverter; and converting the first switching signal through the inverter, and outputting the sinusoidal residual current acting on the electric leakage protection device through the second current-limiting resistor.
Further, the method further comprises: comparing the triangular carrier wave with the harmonic modulation wave through the signal source to obtain a second switching signal of the inverter; and converting the second switching signal through the inverter, and outputting the harmonic residual current acting on the electric leakage protection device through the second current-limiting resistor.
Further, the main circuit includes: the leakage protection device comprises an alternating current power supply, a first current-limiting resistor and a leakage protection device to be tested, wherein the alternating current power supply is electrically connected with the primary side of the leakage protection device through the first current-limiting resistor; the alternating current power supply is used for supplying power to the electric leakage protection device through the first current-limiting resistor.
According to another aspect of the present application, there is provided an operation characteristic test circuit of a leakage current protection operation device, the test circuit including: a main loop and a control circuit; the control circuit is used for generating a sinusoidal residual current and a harmonic residual current in the main circuit so as to respectively act the sinusoidal residual current and the harmonic residual current on the earth leakage protection device in the main circuit; measuring a first residual action current and action occurrence time of the electric leakage protection device in the process that the sinusoidal residual current acts on the electric leakage protection device to obtain a relation between the frequency of the sinusoidal residual current and the first residual action current; wherein the first residual action current is caused by the sinusoidal residual current; and in the process of acting the harmonic residual current on the electric leakage protection device, judging whether an electric shock accident occurs or not by measuring the effective value of the residual action current of the electric leakage protection device in a plurality of preset periods.
Further, the main circuit includes: the leakage protection device comprises an alternating current power supply, a first current-limiting resistor and a leakage protection device to be tested, wherein the alternating current power supply is electrically connected with the primary side of the leakage protection device through the first current-limiting resistor; the control loop includes: the signal source is electrically connected with the input end of the inverter, and the output end of the inverter is electrically connected with the secondary side of the leakage protection device through the second current-limiting resistor.
Further, the test circuit further comprises a rogowski coil and an oscilloscope which are electrically connected between the inverter and the second current limiting resistor.
The embodiment of the invention provides an action characteristic test method and a test circuit of an electric leakage protection action device, wherein the method generates sine residual current and harmonic residual current in a main loop through a control loop so as to simulate the working state of the electric leakage protection device under different working conditions; then, in the process that the sine residual current acts on the electric leakage protection device, measuring a first residual action current and action time of the electric leakage protection device, and analyzing to obtain a relation between the first residual action current and the residual current frequency; and in the process that the harmonic residual current acts on the electric leakage protection device, whether the electric shock accident occurs or not is judged by measuring the effective value of the residual action current of the electric leakage protection device in a plurality of preset periods. In the above operation characteristic test method for the leakage protection operating device, the characteristic test of the 400V low-voltage leakage protection device can be performed in different operating states, and the method mainly includes: on one hand, the test analyzes and sets the relation between the first residual action current and the residual current frequency under the action of the sine residual current, and the action rejection phenomenon caused by the sensitivity deterioration of the leakage protection action device under the action of the high-frequency current can be effectively prevented based on the relation; on the other hand, considering that the leakage protection action device mainly judges whether the leakage protection action device acts according to the amplitude of the residual current and the 400V electrical equipment has larger harmonic, the effective value of the residual action current is used as the action judgment basis of the leakage protection device under the action of the harmonic residual current, so that the phenomenon of operation rejection/misoperation of the leakage protection device under the action of the harmonic electrical equipment can be well prevented. In conclusion, the test mode provided by the embodiment can effectively prevent the low-voltage 400V leakage protection device from being refused to operate/malfunction, and improve the safety and reliability of the production electricity utilization of the 400V low-voltage system; meanwhile, the testing method provided by the embodiment is simple and convenient, good in economical efficiency and strong in practicability.
Drawings
The above and other objects, features and advantages of the present application will become more apparent by describing in more detail embodiments of the present application with reference to the attached drawings. The accompanying drawings are included to provide a further understanding of the embodiments of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the principles of the application. In the drawings, like reference numbers generally represent like parts or steps.
FIG. 1 is a block diagram of a circuit to which exemplary embodiments of the present application are applicable;
fig. 2 is a schematic flowchart of an operation characteristic testing method of an earth leakage protection operating device according to an exemplary embodiment of the present application;
fig. 3 is a schematic diagram illustrating a generation manner of a residual current provided by an exemplary embodiment of the present application;
FIG. 4 is a schematic diagram of a relationship between a first residual current and a sinusoidal residual current frequency provided by an exemplary embodiment of the present application;
fig. 5 is a schematic diagram of a variation relationship of the second residual action current with a phase angle of the harmonic residual current provided by the exemplary embodiment of the present application.
Detailed Description
Hereinafter, example embodiments according to the present application will be described in detail with reference to the accompanying drawings. It should be understood that the described embodiments are only some embodiments of the present application and not all embodiments of the present application, and that the present application is not limited by the example embodiments described herein.
The first embodiment is as follows:
first, for the sake of understanding, the present embodiment provides an operation characteristic test circuit of an earth leakage protection operating device, and exemplifies a practical circuit of an operation characteristic test method of an earth leakage protection operating device.
Referring to the circuit configuration diagram shown in fig. 1, the operation characteristic test circuit of the leakage protection operating device according to this embodiment mainly includes a main circuit and a control circuit. The main circuit includes: the Device comprises an alternating Current power supply, a first Current limiting resistor and a leakage protection Device (RCD) to be tested; wherein, the AC power source is, for example, 220V AC, and is electrically connected to the primary side of the earth leakage protection device through the first current limiting resistor R1, specifically, electrically connected to the live line L1 of the primary side of the earth leakage protection device; the ac power supply is used to supply power to the earth leakage protection device through the first current limiting resistor R1.
The control loop includes: signal source, inverter and second current limiting resistor R2. The Signal source is usually composed of a DSP (Digital Signal processor) or Labview and other control devices; the signal source is electrically connected with the input end of the inverter, and the output end of the inverter is electrically connected with the secondary side of the leakage protection device through a second current-limiting resistor R2, specifically electrically connected with a zero line L1 on the secondary side of the leakage protection device. Based on this, the test circuit also includes Rogowski coil and oscilloscope connected electrically between the inverter and the second current limiting resistor R2.
Referring to a flowchart of an operation characteristic test method of the earth leakage protection operation device shown in fig. 2, the method is applied to the test circuit, and as shown in fig. 2, the method includes the following steps:
and S202, generating a sine residual current and a harmonic residual current in the main circuit through the control circuit so as to respectively act the sine residual current and the harmonic residual current on the electric leakage protection device in the main circuit.
In practical production application, along with the application of electrical appliances such as a variable frequency motor and the like, a secondary current signal in the electric leakage protection device often contains high-frequency residual current and harmonic residual current; in order to simulate the working characteristics of the leakage protection device under the working conditions, expected sinusoidal residual current and harmonic residual current can be generated through a signal source (such as a DSP (digital signal processor) and a Labview) in a control loop, and then in the process of acting the sinusoidal residual current and the harmonic residual current on the leakage protection device, the action characteristics of the leakage protection device under the action of different residual currents can be determined by measuring parameters such as the amplitude, the action occurrence time and the phase angle of the residual current of the leakage protection device.
Step S204, in the process that the sine residual current acts on the electric leakage protection device, measuring the first residual action current and the action occurrence time of the electric leakage protection device to obtain the relationship between the frequency of the first residual action current and the frequency of the sine residual current; wherein the first residual action current is caused by a sinusoidal residual current.
And step S206, in the process that the harmonic residual current acts on the electric leakage protection device, whether an electric shock accident occurs is judged by measuring the effective value of the residual action current of the electric leakage protection device in a plurality of preset periods.
In the operation characteristic test mode of the leakage protection operating device provided by the embodiment of the invention, the working state of the leakage protection device under different working conditions can be simulated, and the characteristic test of the 400V low-voltage leakage protection device is carried out, which mainly comprises the following steps: on one hand, the test analyzes and sets the relation between the first residual action current and the residual current frequency under the action of the sine residual current, and the action rejection phenomenon caused by the sensitivity deterioration of the leakage protection action device under the action of the high-frequency current can be effectively prevented based on the relation; on the other hand, considering that the leakage protection action device mainly judges whether the leakage protection action device acts according to the amplitude of the residual current and the 400V electrical equipment has larger harmonic, the effective value of the residual action current is used as the action judgment basis of the leakage protection device under the action of the harmonic residual current, so that the phenomenon of operation rejection/misoperation of the leakage protection device under the action of the harmonic electrical equipment can be well prevented. In conclusion, the test mode provided by the embodiment can effectively prevent the low-voltage 400V leakage protection device from being refused to operate/malfunction, and improve the safety and reliability of the production electricity utilization of the 400V low-voltage system; meanwhile, the testing method provided by the embodiment is simple and convenient, good in economical efficiency and strong in practicability.
In order to better understand the above testing method, the above steps are described separately.
For step S202, the present embodiment provides a method for generating a sinusoidal residual current and a harmonic residual current. The signal source is usually composed of control devices such as a DSP or a Labview, and the signal source obtains an inverter switching signal by comparing a triangular carrier with a target waveform, and simulates the residual current in the actual work of the leakage protection device through the inverter.
Referring to fig. 3, a schematic diagram of a generation manner of a residual current is shown, where a left column illustrates a generation process of a sinusoidal residual current, including: comparing the triangular carrier wave with sinusoidal modulation waves with different frequencies through a signal source to obtain a first switching signal of the inverter; the first switching signal is converted by the inverter and a sinusoidal residual current acting on the earth leakage protection device is output via a second current limiting resistor R2. Specifically, the inverter filters waveforms of the first switching signal to obtain voltages with different frequencies, where the waveforms of the voltages with different frequencies are different, the voltages generate sinusoidal residual currents with different frequencies after passing through the second current limiting resistor R2, and the sinusoidal residual currents with different frequencies are applied to the earth leakage protection device to test the operating characteristics.
In the process of applying sinusoidal residual currents with different frequencies to the earth leakage protection device, a rogowski coil and an oscilloscope are used for measuring a first residual action current and action occurrence time of the earth leakage protection device to obtain the first residual action current and action time; the first residual action current is residual action current with different amplitudes which triggers the leakage protection device to give an alarm or power off action and the like under the action of sinusoidal residual currents with different frequencies; the action time is the time for triggering the earth leakage protection device to act each time. And then determining the relationship between the first residual action current and the frequency of the sinusoidal residual current based on the first residual action current, the action time and the sinusoidal residual current with different frequencies.
Referring to fig. 4, a schematic diagram of a relationship between the first residual operating current and the frequency of the sinusoidal residual current shows a test result of the sinusoidal residual current with different frequencies, where the result shows that the amplitude of the first residual operating current triggering the earth leakage protection device to operate increases with the increase of the frequency of the sinusoidal residual current, and the sensitivity decreases. In order to prevent the leakage protection device from generating false operation/rejection operation due to the sensitivity deterioration under the action of the high-frequency electrical equipment, in this embodiment, according to the sinusoidal residual currents with different frequencies, the first residual operating current and the operating time measured under the action of the sinusoidal residual current with each frequency, the relationship between the first residual operating current and the frequency of the sinusoidal residual current is set through data fitting, that is, the relationship between the first residual operating current and the frequency of the sinusoidal residual current is determined, as shown in the following formula:
wherein I represents a first residual operating current, I0The residual current is a rated residual current of the earth leakage protection operating device, f is a frequency of a sinusoidal residual current, and A, B, C is a constant.
Referring to a schematic diagram of a generation manner of the harmonic residual current shown in a right column of fig. 3, a generation process of the harmonic residual current includes: comparing the triangular carrier wave with the harmonic modulation wave through a signal source to obtain a second switching signal of the inverter; and the second switching signal is converted by the inverter, and harmonic residual current acting on the electric leakage protection device is output through the second current-limiting resistor. The harmonic residual current thus generated acts on the earth leakage protection device for testing the operating characteristics.
Considering that the phenomenon of operation rejection/misoperation of the electric leakage protection device can be caused by the existence of larger harmonic current in 400V electric equipment, and the electric leakage protection device mainly judges whether to act according to the amplitude of residual current; based on this, in order to better prevent the earth leakage protection device from performing the operation rejection/malfunction under the action of the harmonic electrical equipment, in the process that the harmonic residual current acts on the earth leakage protection device, the present embodiment may extract the effective value of the residual current to be used as the operation criterion of the earth leakage protection device, and specifically includes the following steps 1 to 3:
step 1, measuring a second residual action current of the leakage protection device; the second residual action current is caused by harmonic residual current, and can be understood as residual action current with different amplitudes for triggering the earth leakage protection device to alarm or power off under the action of the harmonic residual current.
And 2, determining the effective value of the residual action current according to the second residual action current in a plurality of preset periods.
And 3, determining that an electric shock accident occurs when the effective value of the residual action current is greater than a preset current threshold value.
Referring to fig. 5, a diagram of the variation of the second residual action current with the phase angle of the harmonic residual current shows an example of the harmonic residual current with the fundamental amplitude of 30mA, in which a third harmonic current with the amplitude of 10mA exists. When the phase angle between the harmonic current and the fundamental current is changed, the amplitude of the second residual action current of the action of the leakage protection device is changed. Based on the above, in order to prevent the earth leakage protection device from generating the action rejection/misoperation under the action of the harmonic current, the effective value of the residual current in three periods can be determined, and if the mutation quantity of the effective value of the residual current exceeds the preset current threshold value of 30mA, the occurrence of the electric shock accident is determined.
In summary, in the operation characteristic testing method of the leakage protection device provided in the above embodiments, the characteristic test of the 400V low-voltage leakage protection device can be performed under the action of the sinusoidal residual current and the harmonic residual current. On one hand, under the action of the sine residual current, the first residual action current of the electric leakage protection device is analyzed and obtained to be increased along with the continuous increase of the frequency of the externally-added sine residual current, and the sensitivity is reduced, so that the action rejection phenomenon caused by the fact that the sensitivity of the electric leakage protection device is reduced under the action of high-frequency current is effectively prevented by setting the relation between the first residual action current and the frequency of the residual current; on the other hand, considering that the phenomenon of operation rejection/misoperation of the leakage protection device can be caused by large harmonic current existing in 400V electrical equipment, the phenomenon of operation rejection/misoperation of the leakage protection device under the action of the harmonic electrical equipment can be well prevented by extracting the effective value of the residual operation current as the action judgment basis of the leakage protection device. Based on the two aspects, the safety and the reliability of the production electricity utilization of the 400V low-voltage system can be effectively improved; meanwhile, the test method provided by the embodiment is simple and convenient, good in economical efficiency and strong in practicability.
Example two:
based on the operation characteristic test method of the leakage protection operating device provided in the first embodiment, the present embodiment provides an operation characteristic test circuit of a leakage protection operating device, where the test circuit includes: a main loop and a control circuit;
the control circuit is used for generating sine residual current and harmonic residual current in the main circuit so as to respectively act the sine residual current and the harmonic residual current on the electric leakage protection device in the main circuit;
measuring a first residual action current and action occurrence time of the electric leakage protection device in the process that the sine residual current acts on the electric leakage protection device to obtain a relation between the frequency of the first residual action current and the frequency of the sine residual current; wherein the first residual action current is caused by a sinusoidal residual current; and in the process that the harmonic residual current acts on the electric leakage protection device, whether the electric shock accident occurs or not is judged by measuring the effective value of the residual action current of the electric leakage protection device in a plurality of preset periods.
The main circuit includes: the leakage protection device comprises an alternating current power supply, a first current-limiting resistor and a leakage protection device to be tested, wherein the alternating current power supply is electrically connected with the primary side of the leakage protection device through the first current-limiting resistor; the control circuit includes: the signal source is electrically connected with the input end of the inverter, and the output end of the inverter is electrically connected with the secondary side of the leakage protection device through the second current-limiting resistor.
In addition, the test circuit further comprises a rogowski coil and an oscilloscope which are electrically connected between the inverter and the second current limiting resistor.
The test circuit can effectively improve the safety and reliability of the production electricity of the 400V low-voltage system; meanwhile, the test method provided by the embodiment is simple and convenient, good in economical efficiency and strong in practicability.
Based on the foregoing embodiments, the present embodiment provides an exemplary electronic device, which includes a processor and a storage device; the storage device stores a computer program, and the computer program, when executed by the processor, executes the method for testing the operating characteristics of the leakage protection operating device according to the embodiment.
It can be clearly understood by those skilled in the art that, for convenience and brevity of description, the specific working processes of the test circuit and the electronic device described above may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
Further, this embodiment also provides a computer-readable storage medium, where a computer program is stored on the computer-readable storage medium, and when the computer program is run by a processing device, the steps of the method for testing the operation characteristics of the leakage protection operation device provided in the foregoing embodiment are executed.
The foregoing describes the general principles of the present application in conjunction with specific embodiments, however, it is noted that the advantages, effects, etc. mentioned in the present application are merely examples and are not limiting, and they should not be considered essential to the various embodiments of the present application. Furthermore, the foregoing disclosure of specific details is for the purpose of illustration and description and is not intended to be limiting, since the foregoing disclosure is not intended to be exhaustive or to limit the disclosure to the precise details disclosed.
The block diagrams of devices, apparatuses, systems referred to in this application are only given as illustrative examples and are not intended to require or imply that the connections, arrangements, configurations, etc. must be made in the manner shown in the block diagrams. These devices, apparatuses, devices, systems may be connected, arranged, configured in any manner, as will be appreciated by those skilled in the art. Words such as "including," "comprising," "having," and the like are open-ended words that mean "including, but not limited to," and are used interchangeably therewith. The words "or" and "as used herein mean, and are used interchangeably with, the word" and/or, "unless the context clearly dictates otherwise. The word "such as" is used herein to mean, and is used interchangeably with, the phrase "such as but not limited to".
It should also be noted that in the devices, apparatuses, and methods of the present application, the components or steps may be decomposed and/or recombined. These decompositions and/or recombinations are to be considered as equivalents of the present application.
The previous description of the disclosed aspects is provided to enable any person skilled in the art to make or use the present application. Various modifications to these aspects will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other aspects without departing from the scope of the application. Thus, the present application is not intended to be limited to the aspects shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
The foregoing description has been presented for purposes of illustration and description. Furthermore, the description is not intended to limit embodiments of the application to the form disclosed herein. While a number of example aspects and embodiments have been discussed above, those of skill in the art will recognize certain variations, modifications, alterations, additions and sub-combinations thereof.
Claims (10)
1. An operation characteristic test method of an earth leakage protection operation device, the method being applied to a test circuit including: a main loop and a control circuit; the method comprises the following steps:
generating a sine residual current and a harmonic residual current in the main loop through the control loop so as to respectively act on the leakage protection device in the main loop;
measuring a first residual action current and action occurrence time of the electric leakage protection device in the process that the sinusoidal residual current acts on the electric leakage protection device to obtain a relation between the frequency of the sinusoidal residual current and the first residual action current; wherein the first residual action current is caused by the sinusoidal residual current;
and in the process of acting the harmonic residual current on the electric leakage protection device, judging whether an electric shock accident occurs or not by measuring the effective value of the residual action current of the electric leakage protection device in a plurality of preset periods.
2. The method according to claim 1, wherein the step of measuring the first residual action current and the occurrence time of the action of the earth leakage protection device to obtain the relationship between the first residual action current and the frequency of the sinusoidal residual current comprises:
measuring the first residual action current and the action occurrence time of the leakage protection device through a Rogowski coil and an oscilloscope to obtain the first residual action current and the action time; the first residual action current is residual action current with different amplitudes of the electric leakage protection device under the action of the sinusoidal residual current with different frequencies;
determining a relationship between the first residual action current and a frequency of the sinusoidal residual current based on the first residual action current, the action time, and the sinusoidal residual current of different frequencies.
3. The method of claim 1, wherein the relationship between the first residual operating current and the residual current frequency is:
wherein I represents the first residual operating current, I0And (c) a frequency representing a rated residual operating current of the earth leakage protection operating device, f representing a frequency of the sinusoidal residual current, and A, B, C being constants.
4. The method as claimed in claim 1, wherein the step of determining whether an electric shock accident occurs by measuring the effective value of the residual operating current of the earth leakage protection device for a predetermined plurality of cycles comprises:
measuring a second residual action current of the earth leakage protection device; wherein the second residual action current is caused by the harmonic residual current;
determining the effective value of the residual action current according to the second residual action current in a plurality of preset periods;
and when the effective value of the residual action current is greater than a preset current threshold value, determining that an electric shock accident occurs.
5. The method of claim 1, wherein the control loop comprises: the signal source is electrically connected with the input end of the inverter, and the output end of the inverter is electrically connected with the secondary side of the leakage protection device through the second current-limiting resistor;
the method further comprises the following steps:
comparing the triangular carrier wave with sinusoidal modulation waves with different frequencies through the signal source to obtain a first switching signal of the inverter; and converting the first switching signal through the inverter, and outputting the sinusoidal residual current acting on the electric leakage protection device through the second current-limiting resistor.
6. The method of claim 5, further comprising:
comparing the triangular carrier wave with the harmonic modulation wave through the signal source to obtain a second switching signal of the inverter; and converting the second switching signal through the inverter, and outputting the harmonic residual current acting on the electric leakage protection device through the second current-limiting resistor.
7. The method of claim 1, wherein the primary loop comprises: the leakage protection device comprises an alternating current power supply, a first current-limiting resistor and a leakage protection device to be tested, wherein the alternating current power supply is electrically connected with the primary side of the leakage protection device through the first current-limiting resistor;
the alternating current power supply is used for supplying power to the electric leakage protection device through the first current-limiting resistor.
8. An operation characteristic test circuit of a leakage protection operation device, the test circuit comprising: a main loop and a control circuit;
the control circuit is used for generating a sinusoidal residual current and a harmonic residual current in the main circuit so as to respectively act the sinusoidal residual current and the harmonic residual current on the earth leakage protection device in the main circuit;
measuring a first residual action current and action occurrence time of the electric leakage protection device in the process that the sinusoidal residual current acts on the electric leakage protection device to obtain a relation between the frequency of the sinusoidal residual current and the first residual action current; wherein the first residual action current is caused by the sinusoidal residual current; and in the process of acting the harmonic residual current on the electric leakage protection device, judging whether an electric shock accident occurs or not by measuring the effective value of the residual action current of the electric leakage protection device in a plurality of preset periods.
9. The test circuit of claim 8, wherein the main loop comprises: the leakage protection device comprises an alternating current power supply, a first current-limiting resistor and a leakage protection device to be tested, wherein the alternating current power supply is electrically connected with the primary side of the leakage protection device through the first current-limiting resistor;
the control loop includes: the signal source is electrically connected with the input end of the inverter, and the output end of the inverter is electrically connected with the secondary side of the leakage protection device through the second current-limiting resistor.
10. The test circuit of claim 9, further comprising a rogowski coil and an oscilloscope electrically connected between the inverter and the second current limiting resistor.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010387332.5A CN111693800A (en) | 2020-05-09 | 2020-05-09 | Action characteristic test method and circuit of leakage protection action device |
| PCT/CN2020/092379 WO2021227128A1 (en) | 2020-05-09 | 2020-05-26 | Action characteristic test method and test circuit for electric leakage protection action device |
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| CN202010387332.5A CN111693800A (en) | 2020-05-09 | 2020-05-09 | Action characteristic test method and circuit of leakage protection action device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112611951A (en) * | 2020-11-27 | 2021-04-06 | 神华四川能源有限公司江油发电厂 | RCD (remote control device) online test system and test method thereof |
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| CN112611951A (en) * | 2020-11-27 | 2021-04-06 | 神华四川能源有限公司江油发电厂 | RCD (remote control device) online test system and test method thereof |
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