CN209590185U - A kind of three-phase passive leakage current tester - Google Patents
A kind of three-phase passive leakage current tester Download PDFInfo
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- CN209590185U CN209590185U CN201822021038.3U CN201822021038U CN209590185U CN 209590185 U CN209590185 U CN 209590185U CN 201822021038 U CN201822021038 U CN 201822021038U CN 209590185 U CN209590185 U CN 209590185U
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Abstract
The utility model discloses a kind of three-phase passive leakage current testers, including single chip control module, loop resistance, control interface, timing module, A/D converter, alarm module and the three phase mains module being connected with single chip control module, the measurement circuit being connected with A/D converter, with the loop-coupled voltage display module of measurement and electric current display module, the time showing module being connected with timing module；Wherein, the loop resistance is also connected with measurement circuit and body one end to be measured.By above-mentioned design, the utility model can be realized the leakage current measurement to three-phase alternating current electrical equipment, the safe operation of operator in safeguard industries production.Therefore, it is suitable for popularization and application.
Description
Technical field
The utility model relates to a kind of leakage current detection techniques, specifically, being to be related to a kind of three-phase passive leakage electricity
Current test instrument.
Background technique
Leakage current refers in the case where no failure applies voltage, it is electrical in the metal parts with mutually insulated it
Between, or between electrical accessory and ground connection part, electric current is formed by by its surrounding medium or insulating surface and is known as leakage current.
Therefore, it is the main indicator for measuring the one of the important signs that and product safety performance of electrical apparatus insulation quality.
Three-phase alternating current is a kind of transporting pattern of electric energy, referred to as three-phase electricity.Three-phase alternating-current supply is by three frequencies
It is identical, amplitude is equal, phase successively 120 ° of mutual deviation exchange potential composition power supply.
Existing leakage current tester is designed for the electric appliance using single-phase electricity mostly, for using three-phase electricity side
The tester research in face is less, and what general factory used is mostly three-phase electricity, how to guarantee that plant operation personnel are not leaked electricity
It is also that factory must solve the problems, such as that stream, which damages accident, carries out leakage current to factory's AC electric equipment and detects right and wrong
Often it is necessary to, thus a kind of three-phase passive leakage current tester being badly in need of high reliablity, having a safety feature.
Utility model content
The purpose of this utility model is to provide a kind of three-phase passive leakage current testers, are mainly used for making in industry
With the detection of the leakage current of three-phase alternating current electrical equipment, with guarantee equipment operator using safe.
To achieve the above object, the technical solution adopted in the utility model is as follows:
A kind of three-phase passive leakage current tester, including single chip control module, are connected with single chip control module
Loop resistance, control interface, timing module, A/D converter, alarm module and three phase mains module, be connected with A/D converter
Measurement circuit, with measure loop-coupled voltage display module and electric current display module, the time being connected with timing module
Display module；Wherein, the loop resistance is also connected with measurement circuit and body one end to be measured.
Further, the measurement circuit includes multiple test probes being connected with the body other end to be measured, is popped one's head in test
Connected selective circuit of measuring range, the leakage current sampled signal amplifier and voltage sampling signal being connected with selective circuit of measuring range are put
Big device, the alarm current initialization circuit being connected with leakage current sampled signal amplifier and voltage sampling signal amplifier, and
The current comparison circuit being connected with alarm current initialization circuit；Wherein, the leakage current sampled signal amplifier and electric current are shown
Module is connected, and voltage sampling signal amplifier is connected with voltage display module, and current comparison circuit is connected with A/D converter.
Further, the three phase mains module includes three-phase power input end, the change being connected with three-phase power input end
Frequency modulation depressor, the rectification filtering voltage stabilizing circuit being connected with frequency conversion voltage adjusting device, and the power supply being connected with rectification filtering voltage stabilizing circuit
Relay；Wherein, relay is connected with single chip control module.
Preferably, the single-chip microcontroller model STM32F107 that the single chip control module uses.
It is shown preferably, the time showing module, electric current display module and voltage display module are all made of LED touch-control
Display screen.
Preferably, the alarm module uses combined aural and visual alarm.
Compared with prior art, the utility model has the following beneficial effects:
(1) the utility model is by setting control interface, for realizing the three-phase measurement of measurement three-phase alternating current electrical equipment
Connection control breaks mutually test in turn, completion sets three-phase alternating current electricity consumption by the connection of manual switching body to be measured and control interface
Standby leakage current measurement, safeguard industries production in operator safe operation.
(2) the utility model can carry out time preset in test, when the test for completing setting by setting timing module
After time, tester can automatically cut off test voltage, practical and efficient, easy to operate.
(3) the utility model is realized by alarm current initialization circuit and current comparison circuit to test electric current and preset report
The comparison of alert electric current, and judgement carries out next step operation after single chip control module is handled.
Detailed description of the invention
Fig. 1 is the utility model principle block diagram.
Fig. 2 is that the utility model measures circuit theory block diagram.
Fig. 3 is the utility model three phase mains module principle block diagram.
Specific embodiment
The utility model is described in further detail with embodiment for explanation with reference to the accompanying drawing, and the mode of the utility model includes
But it is not limited only to following embodiment.
Embodiment
As shown in Figure 1-3, a kind of three-phase passive leakage current tester disclosed by the utility model, including single-chip microcontroller control
Module, the loop resistance being connected with single chip control module, control interface, timing module, A/D converter, alarm module and
Three phase mains module, the measurement circuit being connected with A/D converter are aobvious with the loop-coupled voltage display module of measurement and electric current
Show module, the time showing module being connected with timing module；Timing module is for the time setting in fixed time test.Wherein, institute
Loop resistance is stated also to be connected with measurement circuit and body one end to be measured.The single-chip microcontroller model that the single chip control module uses
STM32F107；The control interface is used to control measurement A phase-shell respectively, B phase-shell and C phase-shell leakage current
Interface selection mode needs manual switching and breaks in turn mutually to measure.
The measurement circuit includes multiple test probes being connected with the body other end to be measured, the range being connected with test probe
Selection circuit, the leakage current sampled signal amplifier and voltage sampling signal amplifier being connected with selective circuit of measuring range, with leakage
The alarm current initialization circuit that current sampling signal amplifier is connected with voltage sampling signal amplifier, and and alarm current
The connected current comparison circuit of initialization circuit；Wherein, the leakage current sampled signal amplifier is connected with electric current display module, electricity
Pressure sampled signal amplifier is connected with voltage display module, and current comparison circuit is connected with A/D converter.Test probe with it is to be measured
Body connection is tested, and selects suitable range by selective circuit of measuring range, test electric current, voltage pass through leakage current sampled signal
Amplifier, voltage sampling signal amplifier amplify, and carry out into overcurrent comparison circuit with the electric current alarming value being placed in advance
Compare, and digital signal converted analog signals by A/D converter is sent to single-chip microcontroller and handled；Another aspect electric current
Value, voltage value are come out by electric current display module and voltage display module real-time display.
The three phase mains module includes three-phase power input end, the frequency conversion voltage adjusting device being connected with three-phase power input end,
The rectification filtering voltage stabilizing circuit being connected with frequency conversion voltage adjusting device, and the supply relay being connected with rectification filtering voltage stabilizing circuit；Its
In, relay is connected with single chip control module.Three-phase power input end accesses three phase mains, frequency conversion voltage adjusting device and rectifying and wave-filtering
Voltage regulator circuit is used as test voltage after carrying out pressure regulation to voltage and provides power supply for whole system.
The time showing module, electric current display module and voltage display module are all made of LED touching display screen.
The alarm module uses combined aural and visual alarm.
The utility model is the improvement based on hardware architecture, and used module and functional circuit are those skilled in the art
Known more mature technology, the content reasonable employment that those skilled in the art can record according to specification, this is practical
It is novel that its specific configuration and circuit connection are repeated no more.
For the utility model by setting control interface, the three-phase for realizing measurement three-phase alternating current electrical equipment measures connection
Control is broken mutually test in turn, completed to three-phase alternating current electrical equipment by the connection of manual switching body to be measured and control interface
Leakage current measurement, safeguard industries production in operator safe operation.Therefore, the utility model has substantive features
And progress.
Above-described embodiment is only one of preferred embodiments of the present invention, should not be taken to limit the utility model
Protection scope, as long as the utility model body design thought and mentally make have no the change of essential meaning or profit
Color, it is solved the technical issues of it is still consistent with the utility model, the protection scope of the utility model should all be included in
Within.
Claims (6)
1. a kind of three-phase passive leakage current tester, which is characterized in that including single chip control module, controlled with single-chip microcontroller
Module connected loop resistance, control interface, timing module, A/D converter, alarm module and three phase mains module, turn with A/D
The connected measurement circuit of parallel operation, with measure loop-coupled voltage display module and electric current display module, with timing module phase
Time showing module even；Wherein, the loop resistance is also connected with measurement circuit and body one end to be measured.
2. a kind of three-phase passive leakage current tester according to claim 1, which is characterized in that the measurement circuit packet
Multiple tests probes being connected with the body other end to be measured are included, and the selective circuit of measuring range that is connected of test probe, and measurement range selection
Circuit connected leakage current sampled signal amplifier and voltage sampling signal amplifier, with leakage current sampled signal amplifier and electricity
The alarm current initialization circuit for pressing sampled signal amplifier connected, and compared with the electric current that alarm current initialization circuit is connected
Circuit；Wherein, the leakage current sampled signal amplifier is connected with electric current display module, voltage sampling signal amplifier and voltage
Display module is connected, and current comparison circuit is connected with A/D converter.
3. a kind of three-phase passive leakage current tester according to claim 2, which is characterized in that the three phase mains mould
Block includes three-phase power input end, the frequency conversion voltage adjusting device being connected with three-phase power input end, the rectification being connected with frequency conversion voltage adjusting device
Filter regulator circuit, and the supply relay being connected with rectification filtering voltage stabilizing circuit；Wherein, relay and single-chip microcontroller control mould
Block is connected.
4. a kind of three-phase passive leakage current tester according to claim 3, which is characterized in that the single-chip microcontroller control
The single-chip microcontroller model STM32F107 that module uses.
5. a kind of three-phase passive leakage current tester according to claim 4, which is characterized in that the time showing mould
Block, electric current display module and voltage display module are all made of LED touching display screen.
6. a kind of three-phase passive leakage current tester according to claim 5, which is characterized in that the alarm module is adopted
Use combined aural and visual alarm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822021038.3U CN209590185U (en) | 2018-12-04 | 2018-12-04 | A kind of three-phase passive leakage current tester |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822021038.3U CN209590185U (en) | 2018-12-04 | 2018-12-04 | A kind of three-phase passive leakage current tester |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209590185U true CN209590185U (en) | 2019-11-05 |
Family
ID=68348566
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201822021038.3U Active CN209590185U (en) | 2018-12-04 | 2018-12-04 | A kind of three-phase passive leakage current tester |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209590185U (en) |
-
2018
- 2018-12-04 CN CN201822021038.3U patent/CN209590185U/en active Active
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