A detector residual current detection method
A technology of residual current and detection method, which is applied in the field of fire protection and electrical fire monitoring, can solve the problems of safety and low accuracy of leakage detection, and achieve the effect of improving accuracy, improving detection accuracy, and low cost
Active Publication Date: 2021-08-24
HANGZHOU BINGJIAN TECH CO LTD
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Problems solved by technology
[0003] The present invention aims to overcome the safety problems caused by the low accuracy of leakage detection caused by large acquisition errors in the prior art, and provides a detector residual current detection method, which simply processes signal sampling, detects the original AC waveform, and obtains current value
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[0041] This embodiment provides a detector residual current detection method, such as figure 1 , image 3 shown, including the following steps:
[0042] S1. The detector detects the original AC waveform and the input voltage Vin;
[0043] S2, the single-chip microcomputer module performs multiple sampling, and calculates the output voltage Vo after sampling by the single-chip microcomputer module ADC;
[0044] The calculation steps in S2 are:
[0045]
[0046]Among them, Vo is the output voltage, Vin is the input voltage, R5 is the resistance value of the resistor, and R4 is the resistance value of the resistor.
[0047] S3. Inputting the sampled output voltage Vo into a preset residual current detection model to obtain the residual current Ic to be detected;
[0048] The residual current detection model is constructed through the following steps:
[0049] S31. Take the output voltage Vo after sampling in n consecutive cycles, and remove the maximum value and minimum v...
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The invention discloses a detector residual current detection method, which overcomes the safety problem caused by the low leakage detection accuracy caused by the large acquisition error in the prior art, and comprises the following steps: S1, the detector detects the original AC waveform and the input voltage Vin; S2, the single-chip microcomputer module performs multiple sampling, and calculates the output voltage Vo after sampling by the single-chip microcomputer module ADC; S3, inputs the sampled output voltage Vo into the preset residual current detection model to obtain the residual current Ic to be detected; S4, The residual current is compared with the preset threshold value, and if the residual current is greater than the threshold value, the single-chip microcomputer module will give a leakage alarm prompt. The invention simply processes the signal sampling, detects the original AC waveform and obtains the current value by substituting the voltage value into the detection model, the circuit is simple and easy to implement, prevents the acquisition error caused by the difference performance of components, improves the detection accuracy and the safety monitoring performance of the fire protection system.
Description
technical field [0001] The invention relates to the technical field of fire protection electrical fire monitoring, in particular to a detector residual current detection method. Background technique [0002] In the prior art, the commonly used processing method for residual current detection is to convert the residual current signal into a DC voltage signal suitable for processing by a single-chip microcomputer through a full-wave rectification, filtering, and amplification circuit, which will easily cause acquisition errors due to differences in component performance parameters . Contents of the invention [0003] The present invention aims to overcome the safety problems caused by the low accuracy of leakage detection caused by large acquisition errors in the prior art, and provides a detector residual current detection method, which simply processes signal sampling, detects the original AC waveform, and obtains current value. [0004] In order to achieve the above obj...
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Login to View More IPC IPC(8): G01R19/25G01R31/52
CPCG01R19/25G01R31/52
Inventor 罗绍仪丁柱罗圣江
Owner HANGZHOU BINGJIAN TECH CO LTD