CN203164305U - Grounding resistor testing instrument - Google Patents
Grounding resistor testing instrument Download PDFInfo
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- CN203164305U CN203164305U CN 201320027747 CN201320027747U CN203164305U CN 203164305 U CN203164305 U CN 203164305U CN 201320027747 CN201320027747 CN 201320027747 CN 201320027747 U CN201320027747 U CN 201320027747U CN 203164305 U CN203164305 U CN 203164305U
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Abstract
The utility model discloses a grounding resistor testing instrument which comprises a current generating device, a test circuit, a voltage and current sampling module, a control and determination module and an output module, wherein the current generating device, the test circuit, the voltage and current sampling module, the control and determination module and the output module are orderly connected; and the test circuit is provided with test electrodes used for connection with a tested resistor. The control and determination module comprises an electronic switch, an A/D converter, and a controller. The output module comprises an alarm device and a display device. The current generating device provides a test current for the test circuit, and the voltage and current sampling module obtains current and voltage signals of a resistor to be tested from the test circuit and outputs the current and voltage signals to the control and determination module. Via obtained current sampling value, the controller in the control module first determines whether to open the alarm device. When the alarm device is in an open state, the whether the tested resistor is qualified can be determined according to a result of comparison between the tested resistor and a preset resistor, and the determination result is displayed, and therefore mistaken determination caused by delay and a current which is too low can be reduced.
Description
Technical field
The utility model relates to technology circuit detection technique field, particularly a kind of earth resistance tester.
Background technology
As shown in Figure 1, existing earth resistance tester produces 0 ~ 30A AC constant-current source by MCU control constant current source generator, is added on the pull-up resistor " RL " through " A " " B " output terminal by output circuit, arrives divider through current sampling circuit by AC/DC." a " " b " is the voltage sampling end, arrives divider through voltage sample circuit by AC/DC.Voltage, current digital signal through divider calculate new numerical value divide two the tunnel, the one tunnel to comparer be used for judging the stake resistance of surveying whether qualified; Another road is given and is shown, and shows by display screen, and this numerical value is exactly the RL resistance.
But because electric current needs the regular hour when reaching setting value, may be because the too small measuring accuracy that influences resistance of voltage, electric current of AC/DC converter input end in this time period, false judgment to measured device takes place in comparer easily, causes false alarm.
Summary of the invention
The purpose of this utility model is the defective at prior art, proposes a kind of earth resistance, and it obtains the current sampling value by MCU and judges whether open alarm, to reduce owing to the low excessively erroneous judgement that causes of electric current is disconnected.
For achieving the above object, the technical scheme that the utility model is taked is: a kind of earth resistance tester comprises successively the current feedback circuit that connects, is provided with test circuit, electric current and voltage sampling module, control judge module and the output module of test electrode to connect test resistance;
Current feedback circuit provides measuring current for test circuit, and the electric current and voltage sampling module obtains electric current and the voltage signal on the testing resistance from test circuit, and exports the control judge module to;
The control judge module comprises electronic switch, A/D converter and controller; Output module comprises alarm and display; Controller obtains the voltage and current signal of electric current and voltage sampling module output through electronic switch and A/D converter, and the voltage and current signal that obtains handled and judge, output control signals to output module according to judged result then, the warning of control alarm, and display is to the demonstration of judged result.
In the utility model, be provided with the resistance prevalue among the controller MCU; Electric current and voltage sampling value are given MCU after passing through electronic switch and A/D converter again, and MCU at first calculates by the current sampling value of obtaining, and judge whether open alarm; When alarm was in open state, it was qualified just to judge whether according to the comparing result of institute's measuring resistance and preset resistance, and judged result is shown.
Further, test circuit is made up of two current paths that are respectively equipped with test electrode in the utility model, and the electric current and voltage sampling module connects wherein current path acquisition current signal, and connects two test electrodes acquisition voltage signal; Then with the voltage and current signal controlling judge module that obtains.The substep judgement that is retrieved as controller respectively of voltage and current signal lays the foundation
Concrete, the electric current and voltage sampling module is made up of current sampling unit and voltage sampling unit, and the input end of current sampling unit connects a current path of test circuit, and output terminal connects the control judge module; Two test electrodes that the input end of voltage sampling unit connects in two current paths obtain voltage signal, and output terminal connects the control judge module.The current sampling unit can adopt existing current transformer, and the voltage sampling unit can adopt existing voltage transformer (VT).
Further, the current feedback circuit in the utility model is existing AC constant-current source generator, also is provided with the AC/DC modular converter between electric current and voltage sampling module and the control judge module, so that controller is to reception and the processing of signal.
Preferably, the controller in the control judge module in the utility model adopts MCU, and its volume is little, and is powerful, can satisfy basic calculating and logic and judge demand.
The beneficial effects of the utility model are, by earlier the current value that obtains being judged whether open alarm, based on the state of alarm, test resistance and preset resistance are compared again, qualified to judge whether, can reduce because the low excessively erroneous judgement that causes of time-delay and electric current is disconnected.
Description of drawings
Figure 1 shows that the schematic block circuit diagram of existing earth resistance tester;
Figure 2 shows that schematic block circuit diagram of the present utility model.
Embodiment
For content of the present utility model is become apparent more, be described further below in conjunction with the drawings and specific embodiments.
Existing earth resistance tester such as Fig. 1, there is the defective of erroneous judgement in it, earth resistance tester of the present utility model, a kind of theory diagram of specific embodiment such as Fig. 2, it comprises successively the current feedback circuit that connects, is provided with test circuit, electric current and voltage sampling module, control judge module and the output module of test electrode to connect test resistance;
Current feedback circuit can be selected existing AC constant-current source, produces the AC constant-current source of 0 ~ 30A, for test circuit provides measuring current; Test circuit is made up of two current paths that are respectively equipped with test electrode; The electric current and voltage sampling module is made up of current sampling unit and voltage sampling unit, and the input end of current sampling unit connects a current path of test circuit, and to obtain current signal, output terminal connects the control judge module by the AC/DC modular converter; Two test electrodes that the input end of voltage sampling unit connects in two current paths obtain voltage signal, and output terminal connects the control judge module;
The control judge module comprises electronic switch, A/D converter and controller, and controller adopts existing MCU, is provided with the resistance prevalue among the MCU; Output module comprises alarm and display; Controller obtains the electric current and voltage sampled signal of electric current and voltage sampling module output through electronic switch and A/D converter; At first judge whether open alarm by the current sampling value of obtaining then; When alarm was in open state, it was qualified just to judge whether according to the comparing result of institute's measuring resistance and preset resistance, and judged result is shown, can reduce thus because time-delay and electric current hang down the erroneous judgement that causes excessively breaks.
Concrete case study on implementation only is preferable case study on implementation of the present utility model described in the utility model, is not to limit practical range of the present utility model.Be that all equivalences of doing according to the content of the utility model claim change and modification, all should be as technology category of the present utility model.
Claims (5)
1. an earth resistance tester is characterized in that, comprises successively the current feedback circuit that connects, is provided with test circuit, electric current and voltage sampling module, control judge module and the output module of test electrode to connect test resistance;
Current feedback circuit provides measuring current for test circuit, and the electric current and voltage sampling module obtains electric current and the voltage signal on the testing resistance from test circuit, and exports the control judge module to;
The control judge module comprises electronic switch, A/D converter and controller; Output module comprises alarm and display; Controller obtains the voltage and current signal of electric current and voltage sampling module output through electronic switch and A/D converter, and the voltage and current signal that obtains handled and judge, output control signals to output module according to judged result then, the warning of control alarm, and display is to the demonstration of judged result.
2. earth resistance tester according to claim 1, it is characterized in that, test circuit is made up of two current paths that are respectively equipped with test electrode, and the electric current and voltage sampling module connects wherein current path acquisition current signal, and connects two test electrodes acquisition voltage signal; Then with the voltage and current signal that obtains respectively after the conversion of AC/DC modular converter, export the control judge module to.
3. earth resistance tester according to claim 1 and 2 is characterized in that, current feedback circuit is the AC constant-current source generator, also is provided with the AC/DC modular converter between electric current and voltage sampling module and the control judge module.
4. earth resistance tester according to claim 1 and 2 is characterized in that, the controller in the control judge module adopts MCU.
5. earth resistance tester according to claim 2, it is characterized in that, the electric current and voltage sampling module is made up of current sampling unit and voltage sampling unit, and the input end of current sampling unit connects a current path of test circuit, and output terminal connects the control judge module; Two test electrodes that the input end of voltage sampling unit connects in two current paths obtain voltage signal, and output terminal connects the control judge module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320027747 CN203164305U (en) | 2013-01-18 | 2013-01-18 | Grounding resistor testing instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320027747 CN203164305U (en) | 2013-01-18 | 2013-01-18 | Grounding resistor testing instrument |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203164305U true CN203164305U (en) | 2013-08-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320027747 Expired - Fee Related CN203164305U (en) | 2013-01-18 | 2013-01-18 | Grounding resistor testing instrument |
Country Status (1)
| Country | Link |
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| CN (1) | CN203164305U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103675462A (en) * | 2013-12-17 | 2014-03-26 | 厦门红相电力设备股份有限公司 | Small-current lightning impulse grounding impedance testing method and device |
| CN103792434A (en) * | 2014-03-05 | 2014-05-14 | 国家电网公司 | Ground resistance monitoring device and monitoring method thereof |
| CN104569595A (en) * | 2013-10-25 | 2015-04-29 | 珠海格力电器股份有限公司 | Resistance value detection device and method |
| CN105866553A (en) * | 2016-04-27 | 2016-08-17 | 天津鑫源达泰建筑工程有限公司 | Instrument and method for on-line detection of ground resistor |
-
2013
- 2013-01-18 CN CN 201320027747 patent/CN203164305U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104569595A (en) * | 2013-10-25 | 2015-04-29 | 珠海格力电器股份有限公司 | Resistance value detection device and method |
| CN103675462A (en) * | 2013-12-17 | 2014-03-26 | 厦门红相电力设备股份有限公司 | Small-current lightning impulse grounding impedance testing method and device |
| CN103675462B (en) * | 2013-12-17 | 2016-05-04 | 厦门红相电力设备股份有限公司 | Little electric current lightning impulse earth loop impedance test method and device thereof |
| CN103792434A (en) * | 2014-03-05 | 2014-05-14 | 国家电网公司 | Ground resistance monitoring device and monitoring method thereof |
| CN105866553A (en) * | 2016-04-27 | 2016-08-17 | 天津鑫源达泰建筑工程有限公司 | Instrument and method for on-line detection of ground resistor |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130828 Termination date: 20180118 |