CN212321725U - Novel loop resistance tester - Google Patents
Novel loop resistance tester Download PDFInfo
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- CN212321725U CN212321725U CN201922088303.4U CN201922088303U CN212321725U CN 212321725 U CN212321725 U CN 212321725U CN 201922088303 U CN201922088303 U CN 201922088303U CN 212321725 U CN212321725 U CN 212321725U
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- resistance tester
- loop resistance
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- 238000012360 testing method Methods 0.000 claims abstract description 50
- 239000003990 capacitor Substances 0.000 claims abstract description 32
- 238000007599 discharging Methods 0.000 claims abstract description 18
- 238000005070 sampling Methods 0.000 claims description 11
- 239000004973 liquid crystal related substance Substances 0.000 claims description 7
- HEZMWWAKWCSUCB-PHDIDXHHSA-N (3R,4R)-3,4-dihydroxycyclohexa-1,5-diene-1-carboxylic acid Chemical compound O[C@@H]1C=CC(C(O)=O)=C[C@H]1O HEZMWWAKWCSUCB-PHDIDXHHSA-N 0.000 claims description 3
- 238000004891 communication Methods 0.000 claims description 3
- 238000001514 detection method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
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Abstract
The utility model discloses a novel loop resistance tester relates to the test field. The scheme is provided for solving the problem that the tester in the prior art must be connected with a power grid alternating current power supply for power supply. The device comprises a capacitor charging module, a constant current discharging module and a control module; the capacitor charging module is respectively electrically connected with the constant current discharging module and the control module; the constant current discharging module is in charge and is in signal connection with the control module; the constant current discharging module comprises a super capacitor, a unit testing connector and a plurality of constant current discharging units which are arranged in parallel; the super capacitor is connected with the test connector through the constant current discharge unit; the test joint is used for connecting two ends of a test article to form a test loop; the control module is connected with the super capacitor in a control mode and is electrically connected with the test connector. The capacitor charging module has the advantages that all direct-current voltages are generated through the capacitor charging module, and the test can be carried out without an external alternating-current voltage source. When the current is tested at 100A, the opening voltage can be not lower than 10V, and the load capacity of the tester is greatly improved.
Description
Technical Field
The utility model relates to a test field especially relates to a novel loop resistance tester.
Background
The loop resistance tester is used for measuring a circuit breaker, the contact resistance of a power line busbar is required to be not lower than direct current 100A according to the IEC standard, and the open-circuit voltage of the loop resistance tester is usually more than 5V because the line connecting the tester and the test circuit breaker is usually longer. Because the loop resistance tester has high output current and higher opening voltage, the output power required by the test is also higher.
When testing circuit breakers in the field at a substation, the test connection point is usually at a distance of up to 10M from the instrument and the test conductor is very thick, so field wiring is very cumbersome. And the total weight of the tester becomes very heavy because the output power of the tester itself is high, so that the work of testing the contact resistance in the field becomes heavy. Because of the large output power, the tester must be connected to the ac mains supply to supply power, which makes circuit breaker detection difficult in remote areas without power supply.
SUMMERY OF THE UTILITY MODEL
In order to solve the problems existing in the prior art, the utility model aims to provide a novel loop resistance tester.
The utility model relates to a novel loop resistance tester, which comprises a capacitance charging module, a constant current discharging module and a control module; the capacitor charging module is respectively electrically connected with the constant current discharging module and the control module; the constant current discharging module is charged and is in signal connection with the control module;
the constant current discharge module comprises a super capacitor, a unit test joint and a plurality of constant current discharge units which are arranged in parallel; the super capacitor is connected with the test connector through the constant current discharge unit; the test joint is used for connecting two ends of a test article to form a test loop;
the control module is connected with the super capacitor in a control mode and is electrically connected with the test connector.
Each constant current discharge unit outputs the same current, and the output current is 100A divided by the number of the constant current discharge units.
The number of the constant current discharge units is 3, and the output current of each constant current discharge unit is 100/3A.
The control module comprises a control chip, an IO output unit and an AD sampling unit; the control chip is connected with the super capacitor through the IO output unit in a control mode and is electrically connected with the test connector through the AD sampling unit.
The control module further comprises a DCDC power supply unit which is electrically connected in series between the capacitor charging module and the control chip.
The control module further comprises a liquid crystal touch screen, and the liquid crystal touch screen is in communication connection with the control chip.
The model of the control chip is LPC 2148.
The model of the AD sampling unit is AD 7656.
The capacitor charging module is a 12V battery pack.
A novel loop resistance tester, its advantage lies in, all direct current voltage all produce through the electric capacity module of charging, the test itself need not external alternating voltage source and can go on. When the current is tested at 100A, the opening voltage can be not lower than 10V, and the load capacity of the tester is greatly improved. When a 10-meter test wire is used for testing, the cross section area of a lead wire can be reduced to 8mm2. The volume and the weight of the test line are greatly reduced, so that the test line is very convenient and portable during field test.
Drawings
Fig. 1 is a schematic circuit block diagram of the novel loop resistance tester of the present invention;
fig. 2 is a schematic circuit diagram of the constant current discharge unit.
Detailed Description
As shown in FIGS. 1 and 2, a novel loop resistance tester comprises a capacitor charging module, a constant current discharging module and a control module. The capacitor charging module is respectively electrically connected with the constant current discharging module and the control module. And the constant current discharging module is charged and is in signal connection with the control module. The capacitor charging module is used for charging the constant current discharging module and providing working voltage for the control module.
The constant current discharging module comprises a super capacitor, a unit testing connector and a plurality of constant current discharging units which are arranged in parallel. The super capacitor is connected with the test connector through the constant current discharge unit. The test joint is used for connecting two ends of a test article to form a test loop.
The control module is in control connection with the super capacitor, is electrically connected with the test connector and is used for controlling the discharge of the super capacitor and collecting the voltage and the loop current of the test loop at two ends of a test article.
Each constant current discharge unit outputs the same current, and the output current is 100A divided by the number of the constant current discharge units. The number of the constant current discharge units can be 3, and the output current of each constant current discharge unit is 100/3A.
The control module comprises a control chip, an IO output unit and an AD sampling unit; the control chip is connected with the super capacitor through the IO output unit in a control mode and is electrically connected with the test connector through the AD sampling unit. The control module further comprises a DCDC power supply unit which is electrically connected in series between the capacitor charging module and the control chip. The control module further comprises a liquid crystal touch screen, and the liquid crystal touch screen is in communication connection with the control chip. The model of the control chip is LPC 2148. The model of the AD sampling unit is AD 7656. The capacitor charging module is a 12V battery pack.
A novel return circuit resistance tester theory of operation charge for the ultracapacitor system of tester through the 12V group battery, charge and carry out the constant current and discharge at the constant current discharge unit through MOSFET control after accomplishing. And the control module based on ARM processing and high-speed AD sampling is adopted to realize the rapid detection of current and sample voltage drop in the discharging process, so that the loop resistance value of a sample loop is obtained and displayed on the liquid crystal touch screen.
The voltage from the 12V battery pack charges the supercapacitor pack until the supercapacitor voltage approaches 10V, the charging process is ready for instrument testing. The constant current discharge units are respectively used for generating 3 groups of constant currents of about 33.3A through MOSFET tubes, and the constant currents output by the 3 groups are connected in parallel and then output to a test sample through a test connector as shown in FIG. 2. The test current which is not less than 100A in total is generated, and the highest load voltage of the loop can reach 10V. In order to control the amount of energy consumed, the duration of the constant current discharge is about 10 ms.
The novel loop resistance tester control module is responsible for generating a discharge control pulse to start constant current discharge, and before the constant current discharge is started, the control chip detects whether the voltage of the super capacitor reaches the minimum requirement of 10V through the IO output unit. And if the lowest allowable discharge voltage is not reached, controlling the super capacitor to continue to be charged until the voltage is not lower than 10V. When the constant current discharge unit starts to discharge, the control chip samples the voltage drop at two ends of the test sample and the loop current at the same time through the AD sampling unit, and divides the voltage data 5ms after discharge by the current data to be used as the actually measured loop resistance value of the test sample.
Various other modifications and changes may be made by those skilled in the art based on the above-described technical solutions and concepts, and all such modifications and changes are intended to fall within the scope of the claims.
Claims (9)
1. A novel loop resistance tester is characterized by comprising a capacitance charging module, a constant current discharging module and a control module; the capacitor charging module is respectively electrically connected with the constant current discharging module and the control module; the constant current discharging module is charged and is in signal connection with the control module;
the constant current discharge module comprises a super capacitor, a unit test joint and a plurality of constant current discharge units which are arranged in parallel; the super capacitor is connected with the test connector through the constant current discharge unit; the test joint is used for connecting two ends of a test article to form a test loop;
the control module is connected with the super capacitor in a control mode and is electrically connected with the test connector.
2. The new loop resistance tester as claimed in claim 1, wherein each of said constant current discharge units outputs the same current, and the output current is 100A divided by the number of constant current discharge units.
3. The new loop resistance tester as claimed in claim 2, wherein the number of said constant current discharge units is 3, and the output current of each of said constant current discharge units is 100/3 a.
4. The novel loop resistance tester as claimed in claim 1, wherein the control module comprises a control chip, an IO output unit and an AD sampling unit; the control chip is connected with the super capacitor through the IO output unit in a control mode and is electrically connected with the test connector through the AD sampling unit.
5. The novel loop resistance tester of claim 4, wherein the control module further comprises a DCDC power supply unit electrically connected in series between the capacitor charging module and the control chip.
6. The novel loop resistance tester of claim 4, wherein the control module further comprises a liquid crystal touch screen, and the liquid crystal touch screen is in communication connection with the control chip.
7. The novel loop resistance tester as claimed in claim 4, wherein the control chip is of type LPC 2148.
8. The novel loop resistance tester of claim 4, wherein the model number of the AD sampling unit is AD 7656.
9. The novel loop resistance tester as claimed in any one of claims 1-8, wherein the capacitive charging module is a 12V battery pack.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922088303.4U CN212321725U (en) | 2019-11-27 | 2019-11-27 | Novel loop resistance tester |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922088303.4U CN212321725U (en) | 2019-11-27 | 2019-11-27 | Novel loop resistance tester |
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| Publication Number | Publication Date |
|---|---|
| CN212321725U true CN212321725U (en) | 2021-01-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201922088303.4U Active CN212321725U (en) | 2019-11-27 | 2019-11-27 | Novel loop resistance tester |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113125856A (en) * | 2021-03-04 | 2021-07-16 | 中国神华能源股份有限公司国华电力分公司 | Resistance testing device, method and equipment |
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2019
- 2019-11-27 CN CN201922088303.4U patent/CN212321725U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113125856A (en) * | 2021-03-04 | 2021-07-16 | 中国神华能源股份有限公司国华电力分公司 | Resistance testing device, method and equipment |
| CN113125856B (en) * | 2021-03-04 | 2023-01-13 | 中国神华能源股份有限公司国华电力分公司 | Resistance testing device, method and equipment |
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