Contact resistance on-line detection device
A detection device and contact resistance technology, applied in the direction of grounding resistance measurement, measurement device, measurement of resistance/reactance/impedance, etc., can solve problems such as risk, increased resistance of contact parts, and inability to realize online monitoring.
Pending Publication Date: 2021-11-16
SHENYANG FIRE RES INST OF MEM
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Problems solved by technology
[0002] At present, the contact resistance test is mostly a four-wire resistance test, which needs to be tested after disconnecting the part to be tested, and online monitoring cannot be realized
For example, a switch, poor contact will lead to an increase in the resistance of the contact part, and it will cause local heating when the current is turned on, which is a risk
But in the environment of home or factory, it is inconvenient to cut off the power
At present, there is no product on the market that can measure resistance during use, so there are still many inconveniences in electrical inspections
Method used
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[0020] Preferred embodiments of the present invention are described below with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are only used to explain the technical principles of the present invention, and are not intended to limit the protection scope of the present invention.
[0021] The invention proposes an online contact resistance detection device, which includes a power supply, a signal amplification filter circuit, a switch circuit, a first current test circuit, a second current test circuit, a resistance R` to be tested, a single-chip microcomputer and an input 485 communication module.
[0022] The principle of this patent is: obtain the test current I1 of a test resistor R connected in parallel with the test resistor R`, obtain the sum of the current on the test resistor R` and the test current I1, and name it as the test current I2. According to the principle of parallel circuit shunting, the resistance va...
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The invention discloses a contact resistance on-line detection device, relates to the technical field of resistance detection, and aims to solve the problem that power needs to be cut off when resistance is measured in the prior art. The device comprises a power supply, a signal amplification filter circuit, a switch circuit, a current test circuit and a single-chip microcomputer. The first current test circuit is connected in parallel with the resistor R to be tested for shunting, and outputs a voltage signal V1 representing the current value of the first current test circuit; the second current test circuit is connected in series with the to-be-tested resistor R and the first current test circuit at the same time, and outputs a voltage signal V1P representing the current value of the second current test circuit; and the single-chip microcomputer is connected with the output end of the first current test circuit and the output end of the second current test circuit, and is used for obtaining the voltage signal V1 and the voltage signal V1P, and calculating and outputting a result.
Description
technical field [0001] The invention relates to the technical field of resistance detection, in particular to an online detection device for contact resistance. Background technique [0002] At present, the contact resistance test is mostly a four-wire resistance test, which needs to be tested after the part to be tested is disconnected, and online monitoring cannot be realized. For example, a switch, poor contact will lead to an increase in the resistance of the contact part, and local heating will be caused when the current is turned on, which is risky. But in the environment of family or factory, it is inconvenient to cut off the power. At present, there is no product on the market that can measure resistance during use, so there are still many inconveniences in electrical inspections. Contents of the invention [0003] The present invention proposes a contact resistance online detection device, which includes: [0004] Power supply, signal amplification filter circu...
Claims
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Login to View More IPC IPC(8): G01R27/20G01R27/08G01R15/14
CPCG01R27/20G01R27/08G01R15/146
Inventor 余广智高翱王玮王聪聪王阳芦日新李多君白晋豪
Owner SHENYANG FIRE RES INST OF MEM