CN209342812U - A kind of earth-continuity tester - Google Patents
A kind of earth-continuity tester Download PDFInfo
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- CN209342812U CN209342812U CN201822022405.1U CN201822022405U CN209342812U CN 209342812 U CN209342812 U CN 209342812U CN 201822022405 U CN201822022405 U CN 201822022405U CN 209342812 U CN209342812 U CN 209342812U
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Abstract
The utility model discloses a kind of earth-continuity testers, including controller, resistance measuring module, LCD display, acoustooptic alarm, control button and current transformation module connected to the controller, the current transformation module being connect respectively with pressure regulator, resistance measuring module, the resistance measuring module is connect with LCD display, and the resistance measuring module is connect with current transformation module；The input terminal of the current transformation module is equipped with the pressure regulator power supply control relay for accessing 220V alternating current, and driving circuit is provided between the controller and pressure regulator power supply control relay, time adjustment button is also connected on the controller.The utility model has reached effect easy to operate, improves testing efficiency, keeps test more intelligent.
Description
Technical field
The utility model relates to a kind of testers, specifically, being to be related to a kind of earth-continuity tester.
Background technique
There are three pins, i.e. firewire, zero curve and ground line on family's plug of some large sizes, fiery in actual use
Line and zero curve can just be such that household electrical appliances work normally, and ground line is grounded electric appliance, play a protective role；Electric appliance ground connection, which also can guarantee, to be made
The personal safety of user, in electric appliance internal electrical losses, electric current can be guided into the earth by grounding technology, protect a user from electric shock.
It is whether good in order to detect ground state, it needs to test ground resistance using resistance meter, ground resistance size directly embodies
The good degree that electric device is contacted with " ground ", also reflects the scale of grounded screen, and earth resistance tester groundwork is former
Reason is: the electric appliance generates an electric current output, which is connect by probe at tested earth mat both ends, and electric current passes through earth mat electricity
Resistance forms a voltage signal, calculates ground resistance finally by voltage signal and current signal.
Currently, the modes measurement of Grounding Resistance such as hand-rail type ground resistance table, ground insulation ohmmeter are mainly used in the power system,
The latter needs to be arranged voltage pole and electric current pole in measurement, and in order to reduce error, down conductor must and protected object
It disconnects, so that the step of test is complicated, testing efficiency is low.
Summary of the invention
The purpose of this utility model is to provide a kind of earth-continuity testers, solve existing test mode operation step
Rapid problem cumbersome, testing efficiency is low.
To achieve the above object, the technical solution adopted in the utility model is as follows:
A kind of earth-continuity tester, including controller, resistance measuring module connected to the controller, LCD are shown
Screen, acoustooptic alarm, control button and current transformation module, the current transformation being connect respectively with pressure regulator, resistance measuring module
Module, the resistance measuring module are connect with LCD display, and the resistance measuring module is connect with current transformation module；It is described
The input terminal of current transformation module is equipped with pressure regulator power supply control relay for accessing 220V alternating current, the controller with
It is provided with driving circuit between pressure regulator power supply control relay, time adjustment button is also connected on the controller；
The current transformation module includes sequentially connected pressure regulator, isolating transformer, current transformer, current sample letter
Number amplifier and analog-digital converter, the pressure regulator power supply control relay are connect with pressure regulator, the analog-digital converter will
To current and voltage data signal be transferred to controller, the analog-digital converter is connect with resistance measuring module.
Further, the resistance measuring module includes alarm resistance initialization circuit, the mutual induction of voltage connecting with tested end
Device is connected to the resistance gear switching circuit and comparison circuit of alarm resistance initialization circuit output end, is connected to resistance gear and cuts
Change the voltage sampling signal amplifier of circuit output end；
The resistance gear switching circuit is connected to the output end of voltage transformer, the voltage sampling signal amplifier
Output end is connect with analog-digital converter, comparison circuit respectively, and the output end of the comparison circuit is connect with controller, the electric current
Mutual inductor is connect with the anode at tested end, and the isolating transformer is connect with the cathode at tested end.
Further, signal converting circuit is connected between the control button and controller.
Further, charactron driver is connected between the LCD display and controller.
Further, the model MCP3202 of the analog-digital converter.
Further, the model LPC1114F of the controller.
Compared with prior art, the utility model has the following beneficial effects:
(1) test current needed for the utility model is adjusted by current transformation module, resistance measuring module is for being arranged
Reference resistance, and by the ground resistance measured compared with reference resistance, if being higher than reference resistance, start acoustooptic alarm, and
Cutting output electric current；During the test, measured object reaches the defined time, can also cut under the effect of defined test current
Disconnected output electric current, completes test；The utility model solves that existing test mode is complex for operation step, testing efficiency is low asks
Topic makes test process become easy, improves work efficiency.
(2) the utility model controls the working condition of pressure regulator power supply control relay by driving circuit, works as pressure regulator
When power supply control relay is closed, pressure regulator carries out current regulation to the 220V alternating current of input, after isolating transformer,
Obtained current signal is amplified, finally converts analog signals into digital data transmission to controller；Current transformation mould
Test current needed for block is used to export test, and it is transferred to resistance measuring module, intelligent adjusting is realized, user is facilitated to grasp
Make.
(3) combined aural and visual alarm of the utility model setting is when the resistance value measured is higher than reference resistance or tested end open circuit
Starting achievees the purpose that remind tester, presses control button at this time, so that it may tester be made to restore normal condition.
(4) LCD display of the utility model setting can show testing time, test resistance value and test current value,
The result of test can conveniently be got information about by making tester more.
Detailed description of the invention
Fig. 1 is the annexation figure in the utility model between each module.
Fig. 2 is the principles of the present invention 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 Figs. 1-2, a kind of earth-continuity tester disclosed by the utility model, including model LPC1114F
Controller, resistance measuring module, LCD display, acoustooptic alarm, control button and current transformation mould connected to the controller
Block, the current transformation module connecting respectively with pressure regulator, resistance measuring module, the resistance measuring module and LCD display connect
It connects, the resistance measuring module is connect with current transformation module；The input terminal of the current transformation module is equipped with for accessing
The pressure regulator power supply control relay of 220V alternating current, is provided with drive between the controller and pressure regulator power supply control relay
Circuit is moved, is also connected with time adjustment button on the controller, signal is connected between the control button and controller and is turned
Circuit is connect, charactron driver is connected between the LCD display and controller；
The current transformation module includes sequentially connected pressure regulator, isolating transformer, current transformer, current sample letter
The analog-digital converter of number amplifier and model MCP3202, the pressure regulator power supply control relay is connect with pressure regulator, described
Obtained current and voltage data signal is transferred to controller by analog-digital converter, and the analog-digital converter and resistance measuring module connect
It connects.
The resistance measuring module includes alarm resistance initialization circuit, and the voltage transformer connecting with tested end is connected to
The resistance gear switching circuit and comparison circuit of alarm resistance initialization circuit output end are connected to the output of resistance gear switching circuit
The voltage sampling signal amplifier at end；
The resistance gear switching circuit is connected to the output end of voltage transformer, the voltage sampling signal amplifier
Output end is connect with analog-digital converter, comparison circuit respectively, and the output end of the comparison circuit is connect with controller, the electric current
Mutual inductor is connect with the anode at tested end, and the isolating transformer is connect with the cathode at tested end.
The test philosophy of the utility model is as follows:
Input 220V exchange supplies electricity to pressure regulator, and pressure regulator adjusts output size of current, mutual by isolating transformer and electric current
Sensor obtains current sampling signal, then is amplified by current sampling signal amplifier to signal, finally by Current Voltage
Analog signal is converted to data signal transmission to controller；The output electric current of current transformer is by the tested anode held, isolation
For the output electric current of transformer after the cathode at tested end, obtained sampling voltage value is by voltage transformer, then passes through voltage
Sampled signal amplifier amplifies signal, and the analog signal of Current Voltage is finally converted to data signal transmission to control
Device, meanwhile, amplified signal is transferred to comparison circuit compared with reference resistance, measured resistance be higher than reference resistance or by
When surveying end open circuit, combined aural and visual alarm starting, reference resistance passes through alarm resistance initialization circuit setting, the size essence of comparison resistance
Upper is exactly the size of comparison voltage；The utility model is provided with time adjustment button, for adjusting regular time, in test
In the process, end is tested under the test current effect that current transformation module exports, and can pass through control when reaching regular time
Device control driving circuit makes pressure regulator power supply control relay stop working, and does not power to pressure regulator, to cut off Current Mutual Inductance
The output electric current of device and isolating transformer；If there is resistance value higher than reference resistance or tested end open circuit, output can be also cut off
Electric current；The control button of setting is for starting tester work or in abnormal cases reset test instrument.
The utility model by above-mentioned design, solves that existing test mode is complex for operation step, testing efficiency is low asks
Topic, only needs setting time and reference resistance during the test, test lead is connect with measured object, pressing control button can
It is grounded the measurement of resistance, and test result is shown on LCD display, it is easy to operate, it improves work efficiency, makes to survey
It tries more intelligent.
The utility model is the improvement based on hardware architecture, and used electronic device is the prior art, and can directly be led to
It crosses buying to obtain, the content reasonable employment that those skilled in the art can record according to specification, the utility model is specific to its
Construction repeats no more.
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 earth-continuity tester, which is characterized in that including controller, resistance measurement mould connected to the controller
Block, LCD display, acoustooptic alarm, control button and current transformation module, connect with pressure regulator, resistance measuring module respectively
Current transformation module, the resistance measuring module connect with LCD display, the resistance measuring module and current transformation module
Connection；The input terminal of the current transformation module is equipped with the pressure regulator power supply control relay for accessing 220V alternating current, institute
It states and is provided with driving circuit between controller and pressure regulator power supply control relay, be also connected with time adjustment on the controller
Button；
The current transformation module includes that sequentially connected pressure regulator, isolating transformer, current transformer, current sampling signal are put
Big device and analog-digital converter, the pressure regulator power supply control relay connect with pressure regulator, and the analog-digital converter will obtain
Current and voltage data signal is transferred to controller, and the analog-digital converter is connect with resistance measuring module.
2. a kind of earth-continuity tester according to claim 1, which is characterized in that the resistance measuring module packet
Alarm resistance initialization circuit is included, the voltage transformer connecting with tested end is connected to the electricity of alarm resistance initialization circuit output end
Gear switch circuit and comparison circuit are hindered, the voltage sampling signal amplifier of resistance gear switching circuit output end is connected to；
The resistance gear switching circuit is connected to the output end of voltage transformer, the output of the voltage sampling signal amplifier
End is connect with analog-digital converter, comparison circuit respectively, and the output end of the comparison circuit is connect with controller, the Current Mutual Inductance
Device is connect with the anode at tested end, and the isolating transformer is connect with the cathode at tested end.
3. a kind of earth-continuity tester according to claim 1, which is characterized in that the control button and control
Signal converting circuit is connected between device.
4. a kind of earth-continuity tester according to claim 1, which is characterized in that the LCD display and control
Charactron driver is connected between device processed.
5. a kind of earth-continuity tester according to claim 2, which is characterized in that the type of the analog-digital converter
Number be MCP3202.
6. a kind of earth-continuity tester according to claim 3, which is characterized in that the model of the controller
LPC1114F。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822022405.1U CN209342812U (en) | 2018-12-04 | 2018-12-04 | A kind of earth-continuity tester |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822022405.1U CN209342812U (en) | 2018-12-04 | 2018-12-04 | A kind of earth-continuity tester |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209342812U true CN209342812U (en) | 2019-09-03 |
Family
ID=67750473
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201822022405.1U Active CN209342812U (en) | 2018-12-04 | 2018-12-04 | A kind of earth-continuity tester |
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| Country | Link |
|---|---|
| CN (1) | CN209342812U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113866678A (en) * | 2020-06-30 | 2021-12-31 | 北京小米移动软件有限公司 | Detection jig, detection method, terminal and storage medium |
| CN114137340A (en) * | 2021-11-23 | 2022-03-04 | 广西电网有限责任公司来宾供电局 | Transformer substation conduction tester with remote control function |
-
2018
- 2018-12-04 CN CN201822022405.1U patent/CN209342812U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113866678A (en) * | 2020-06-30 | 2021-12-31 | 北京小米移动软件有限公司 | Detection jig, detection method, terminal and storage medium |
| CN114137340A (en) * | 2021-11-23 | 2022-03-04 | 广西电网有限责任公司来宾供电局 | Transformer substation conduction tester with remote control function |
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