CN112731007A - Residual current protection device test system - Google Patents
Residual current protection device test system Download PDFInfo
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- CN112731007A CN112731007A CN202011439289.9A CN202011439289A CN112731007A CN 112731007 A CN112731007 A CN 112731007A CN 202011439289 A CN202011439289 A CN 202011439289A CN 112731007 A CN112731007 A CN 112731007A
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- protection device
- residual current
- current
- current protection
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
Abstract
The invention relates to a residual current protection device test system, which comprises: the current detection module is used for detecting the test current flowing to the residual current protection device; a control module, comprising: a control unit for generating voltage control signals of at least two voltage waveforms; the digital-to-analog conversion unit is connected with the control unit and used for outputting test voltage to the residual current protection device according to the voltage control signal; the analog-to-digital conversion unit is connected with the current detection module and the control unit and is used for outputting a current feedback signal to the control unit according to the test current detected by the current detection module; and the control unit tests the residual current protection device according to the current feedback signal. The invention can simply, conveniently and effectively complete the test tests of various residual current protection devices which accord with the test standard.
Description
Technical Field
The invention relates to the technical field of electronic appliances, in particular to a residual current protection device testing system.
Background
With the development of industrial technology and the improvement of the living standard of people, people pay more and more attention to the prevention of electrical fire and electric shock protection. The residual current protection device is a device for testing residual current, comparing a residual current value with a reference value, and disconnecting the main circuit contact when the residual current value exceeds the reference value. Which is an important control device in power systems.
In the power system, the number of the residual current protection devices is large, and the operation reliability of the residual current protection devices not only is related to the circuit breaker, but also affects other equipment and even the whole power system. Therefore, testing the performance of the residual current protection device is an important task.
In recent years, with the development of new energy, the popularization of electric automobiles and the use of a large number of high-frequency electric devices, the waveform of the residual current is more and more complex, and the types of residual current protection devices are more and more. However, most of the testing systems for the residual current protection devices on the market currently are single-type (e.g., B-type, a-type or AC-type) testing systems, and there is no testing system that can cover various residual current protection device performance tests (such as breaking time tests and tripping current tests).
Disclosure of Invention
Therefore, there is a need for a testing system for a residual current protection device that can cover various performance tests of the residual current protection device.
A residual current protection device test system comprising:
the current detection module is used for detecting the test current flowing to the residual current protection device;
a control module, comprising:
a control unit for generating voltage control signals of at least two voltage waveforms;
the digital-to-analog conversion unit is connected with the control unit and used for outputting test voltage to the residual current protection device according to the voltage control signal;
the analog-to-digital conversion unit is connected with the current detection module and the control unit and is used for outputting a current feedback signal to the control unit according to the test current detected by the current detection module;
and the control unit tests the residual current protection device according to the current feedback signal.
In one embodiment, the control module includes an acquisition card, and the control unit, the digital-to-analog conversion unit, and the analog-to-digital conversion unit are located on the acquisition card.
In one embodiment, the control module further includes a power amplifying unit, and the power amplifying unit is connected between the digital-to-analog conversion unit and the residual current protection device testing system.
In one embodiment, the power amplification unit includes a power amplifier.
In one embodiment, the control module further comprises a current regulating unit for regulating the test current to the residual current protection device.
In one embodiment, the current regulating unit comprises a load.
In one embodiment, the current detection module comprises a current transformer.
In one embodiment, the control unit tests tripping current and breaking time of the residual current protection device according to the current feedback signal.
In one embodiment, the control unit is further configured to store the test current detected by the current detection module according to a current feedback signal.
In one embodiment, the residual current protection device testing system further comprises a switch module, the switch module comprising:
the emergency stop switch is connected with an external power supply and is used for switching on and switching off the residual current protection device test system;
the control switch is positioned between the emergency stop switch and the control module and is used for switching on and off the control module;
and the starting switch is positioned between the control switch and the residual current protection device and is used for switching on and off the residual current protection device.
The residual current protection device test system can generate test voltages with various voltage waveforms through the control unit and the digital-to-analog conversion module under the control of software, so that test currents with various waveforms are formed. Therefore, the invention can simply, conveniently and effectively complete the test tests of various residual current protection devices which accord with the test standard.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the conventional technologies, the drawings used in the description of the embodiments or the conventional technologies will be briefly introduced below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a part of a testing system of a residual current protection device according to an embodiment;
FIG. 2 is a schematic structural diagram of another part of a residual current protection device testing system according to an embodiment;
FIG. 3 is a schematic diagram of a control panel according to an embodiment.
Detailed Description
To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Embodiments of the invention are presented in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
It is to be understood that "connection" in the following embodiments is to be understood as "electrical connection", "communication connection", and the like if the connected circuits, modules, units, and the like have communication of electrical signals or data with each other.
As used herein, the singular forms "a", "an" and "the" may include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises/comprising," "includes" or "including," etc., specify the presence of stated features, integers, steps, operations, components, parts, or combinations thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof.
In one embodiment, referring to fig. 1, there is provided a residual current protection device testing system comprising: a current detection module 100 and a control module 200.
As an example, the residual current protection device here may be a residual current protection circuit breaker.
The current detection module 100 is used for detecting a test current flowing to the residual current protection device. Which may include but is not limited to being a current transformer. The current detection module 100 can perform multi-range current measurement, so that various residual current protection devices can be tested.
The control module 200 includes a control unit 210, a digital-to-analog conversion unit 220, and an analog-to-digital conversion unit 230.
The control unit 210 may receive a control command, so as to generate voltage control signals with at least two voltage waveforms, and further, may test various residual current protection devices.
Specifically, the voltage control signals of various waveforms may be generated by operating related software (such as labview software) on a human-computer interaction interface (e.g., the control panel 500), so that the control unit 210 receives the control instruction. Furthermore, the control unit 210 may also control the amplitude, the holding time, and the like of the test voltage under the control instruction.
The digital-to-analog conversion unit 220 is connected to the control unit 210, and further outputs a test voltage to the residual current protection device according to the voltage control signal. Specifically, the voltage control signal output by the control unit 210 is a digital signal. The digital-to-analog conversion unit 220 performs digital-to-analog conversion on the digital signal, so that a corresponding test voltage can be obtained and output to the residual current protection device.
The residual current protection device forms a test current under the test voltage. When the test current reaches a certain value, the residual current protection device trips off, and the test current in the test loop gradually changes to zero. The current detection module 100 detects the test current in real time.
The analog-to-digital conversion unit 230 is connected to the current detection module 100 and the control unit 210, so as to perform analog-to-digital conversion on the test current detected by the current detection module 100, obtain a current feedback signal, and output the current feedback signal to the control unit.
The control unit 210 obtains the test current condition in the test loop according to the current feedback signal output by the analog-to-digital conversion unit 230, and then completes the tests of the tripping current, the breaking time and the like of the residual current protection device.
Specifically, the control unit 210 may select a waveform required for the residual current test in the control process. Obtaining parameters (such as peak value and phase) of residual current (test current), selecting a test mode, setting stop time and the like.
In the test system of this embodiment, under software control (e.g., labview software control), test voltages with various voltage waveforms can be generated by the control unit and the digital-to-analog conversion module, so as to form test currents with various waveforms. Therefore, the invention can simply, conveniently and effectively complete various residual current protection device test tests conforming to the test standard (such as GB22794-2008 standard).
In one embodiment, the control module 200 includes an acquisition card. The acquisition card body can be installed on an industrial personal computer. The control unit 210, the digital-to-analog conversion unit 220 and the analog-to-digital conversion unit 230 are all located on the acquisition card, thereby facilitating integrated control.
Of course, the present invention is not limited thereto, and for example, the control unit 210, the digital-to-analog conversion unit 220, and the analog-to-digital conversion unit 230 may be wholly or partially integrated in other types of printed circuit boards.
In one embodiment, with continued reference to fig. 1, the control module 200 further includes a power amplification unit 240. The power amplifying unit 240 is connected between the digital-to-analog converting unit 220 and the residual current protection device testing system, thereby providing a larger test voltage and outputting a larger test current.
Specifically, the input end of the power amplifying unit 240 is connected to the digital-to-analog converting unit 220, so as to amplify the test voltage output by the digital-to-analog converting unit 220. Meanwhile, the output end of the power amplifying unit 240 may be connected to the neutral line N of the incoming line end and the neutral line N of the outgoing line end of the residual current protection device, so as to inject the test current into the residual current protection device.
As an example, the power amplifying unit 240 may include a power amplifier.
In one embodiment, with continued reference to fig. 1, the control module 200 further includes a current regulation unit 250. The current regulating unit 250 is used to regulate the test current to the residual current protection device.
As an example, the current adjusting unit 250 may include a load. The load can be connected with the residual current protection device in series, so that the magnitude of the test current can be conveniently adjusted.
In one embodiment, the control unit 210 of the control module 200 is further configured to save the test current detected by the current detection module 100 according to the current feedback signal.
Specifically, the control unit 210 may generate and save a waveform of the test current according to the current feedback signal, and it may be provided with a waveform overloading function. At this time, the saved waveform can be output by operating related software (such as labview software) on a human-computer interaction interface (such as the control panel 500), so as to facilitate the test analysis.
In one embodiment, referring to fig. 2, the residual current protection device testing system further comprises a switch module 300. The switch module 300 includes an emergency stop switch 310, a control switch 320, and an on switch 330.
And the emergency stop switch 310 is connected with an external power supply and used for switching on and off the residual current protection device test system. The scram switch 310 is normally in a normally closed state to facilitate testing. When an accident occurs, the test system may be stopped by opening the emergency stop switch 310.
The control switch 320 is located between the scram switch 310 and the control module 240 for switching the control module 240 on and off. The control module 240 may be caused to perform the associated control action by closing the control switch 320.
The switch 330 is located between the control switch 320 and the residual current protection device for turning on and off the residual current protection device.
Further, the residual current protection device testing system may further include a power supply module 400, which is configured to supply power to the residual current protection device. As an example, the power supply module 400 may be an isolation transformer. The output end of the isolation transformer can be connected with a live wire and a zero wire of the incoming line end of the residual current protection device, so that power is supplied to the residual current protection device.
At this time, the turn-on switch 330 may be specifically located between the power supply module 400 and the residual current protection device, so as to turn on or off the residual current protection device.
In addition, referring to fig. 3, in the embodiment of the present invention, the residual current protection device testing system may further include a control panel 500. The control panel 500 may have associated control software (e.g., labview software) installed thereon. Also, the control panel 500 may be provided with control buttons corresponding to the respective switches of the switch module 300. For example, an emergency stop button 510 corresponding to the emergency stop switch 310, a control button 520 corresponding to the control switch 320, and an on button 530 corresponding to the on switch 330 may be included.
In one embodiment, the residual current protection device test system has the following four test modes:
(1) testing mode of type B residual current;
(2) a test mode for type a residual current;
(3) a test mode for AC type residual current;
(4) test mode for type F residual current.
The residual current generated and adjustable by the test system includes:
(1)50Hz-1000Hz variable frequency alternating current residual current;
(2) composite current composed of 50Hz, 1kHz and 10Hz frequencies;
(3) smoothing the direct current residual current;
(4) superposing the pulsating direct current residual current on the smooth direct current residual current;
(5) pulsating direct current residual current (with switching-on phase angle control); ,
(6) the direct current residual current is generated by a rectification circuit with two-phase power supply;
(7) direct current residual current generated by a rectifying circuit powered by three phases;
(8)50Hz alternating residual current.
The variable frequency alternating current can meet the test of the sinusoidal alternating current residual current of 1000Hz and below, the current range is slowly increased from 6mA to 30mA, and the current is suddenly increased to 30mA, 60mA and 150 mA.
The composite current is composed of sinusoidal currents with frequencies of 50Hz, 1KHz and 10Hz respectively and amplitude ratio of 4:4:1, the suddenly increased current is 210mA, and the slowly increased current range is 6mA-42 mA.
In the test of the smooth direct current residual current, the current is slowly increased from 6mA to 30mA, and the current is suddenly increased to 60mA, 120mA and 300 mA.
And in the test of superposing the pulsating direct current residual current on the smooth direct current residual current, slowly increasing the current range from 0 to 1.4I when the current I is less than 10mA, and slowly increasing the current range from 0 to 2I when the current I is more than 10 mA. The values of the smoothed direct current in type A, F and B are 6mA, 6mA and 10mA, respectively.
The testing of the pulsating direct current residual current comprises the steps of dividing a switching-on angle into 0 degree, 90 degrees and 135 degrees, slowly increasing the current I when the current I is less than 10mA, and the current range is from 0 to 1.4I, and slowly increasing the current I when the current I is more than 10mA, and the current range is from 0 to 2I. The suddenly increasing current values were 42mA, 84mA and 210mA, respectively (the closing angle was 0 degrees).
The test of the two-phase rectification residual current has the advantages that the current is slowly increased from 6mA to 60mA, and the current is suddenly increased to 60mA, 120mA and 300 mA.
In the test of the three-phase rectified residual current, the current is slowly increased from 6mA to 60mA, and the current is suddenly increased to 60mA, 120mA and 300 mA.
In the description herein, references to the description of "one embodiment" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, a schematic description of the above terminology may not necessarily refer to the same embodiment or example.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A residual current protection device test system, comprising:
the current detection module is used for detecting the test current flowing to the residual current protection device;
a control module, comprising:
a control unit for generating voltage control signals of at least two voltage waveforms;
the digital-to-analog conversion unit is connected with the control unit and used for outputting test voltage to the residual current protection device according to the voltage control signal;
the analog-to-digital conversion unit is connected with the current detection module and the control unit and is used for outputting a current feedback signal to the control unit according to the test current detected by the current detection module;
and the control unit tests the residual current protection device according to the current feedback signal.
2. The residual current protection device test system according to claim 1, wherein the control module comprises an acquisition card, and the control unit, the digital-to-analog conversion unit and the analog-to-digital conversion unit are located on the acquisition card.
3. The residual current protection device test system according to claim 1 or 2, wherein the control module further comprises a power amplification unit connected between the digital-to-analog conversion unit and the residual current protection device test system.
4. The residual current protection device test system according to claim 3, wherein the power amplification unit comprises a power amplifier.
5. The residual current protection device test system according to claim 1, wherein the control module further comprises a current regulating unit for regulating the test current to the residual current protection device.
6. The residual current protection device test system according to claim 1, wherein the current regulation unit comprises a load.
7. The residual current protection device test system according to claim 1, wherein the current detection module comprises a current transformer.
8. The residual current protection device test system according to claim 1, wherein the control unit tests tripping current and breaking time of the residual current protection device according to the current feedback signal.
9. The residual current protection device test system according to claim 1, wherein the control unit is further configured to store the test current detected by the current detection module according to a current feedback signal.
10. The residual current protection device test system according to claim 1, further comprising a switch module, said switch module comprising:
the emergency stop switch is connected with an external power supply and is used for switching on and switching off the residual current protection device test system;
the control switch is positioned between the emergency stop switch and the control module and is used for switching on and off the control module;
and the starting switch is positioned between the control switch and the residual current protection device and is used for switching on and off the residual current protection device.
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Cited By (1)
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| CN113985158A (en) * | 2021-09-18 | 2022-01-28 | 河北工业大学 | Residual current protection inspection method, inspection device, electronic device and storage medium |
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