Multi-line electric leakage synchronous detection device of 220V alternating current lines

Abstract

The invention provides a multi-line electric leakage synchronous detection device of 220V alternating current lines. The multi-line electric leakage synchronous detection device comprises a plurality of single electric leakage signal sampling circuits connected in parallel and connected with a main control unit. Each sampling circuit comprises a current transformer, a signal amplification and processing module and a signal conversion processing module and is connected with a data transmission, recording and management module, wherein the signal amplification and processing module comprises an amplifier circuit, and a resistance-capacitance filter circuit; the signal conversion processing module employs an ADC branch control unit; the current transformer, the amplifier circuit, the filter circuit, the ADC branch control unit and the main control unit are connected successively. The main control unit is connected with a clock circuit and a displayer. The device can completely record and store the dynamic state electric leakage current and the corresponding electric leakage occurrence time of each power supply line in real time, provide accurate and reliable maintenance information, furthest narrow the line fault coverage and improve the accuracy and efficiency of line maintenance.

Description

technical field [0001] The invention relates to the technical field of leakage detection of power distribution lines, in particular to a multi-channel leakage synchronous detection device for 220V AC lines. Background technique [0002] In the 380 / 220V low-voltage power supply lines of the prior art, especially for 220V single-phase AC power, due to the wider application occasions, the large number of users, and the different awareness and skills of users in safe use of electricity, when the line When leakage occurs, there will be unpredictable leakage accidents and potential safety hazards. The leakage detection used in the prior art is the detection technology of a single leakage signal. When the leakage action value in the line is greater than the set value, the protector will operate. Cutting off the protected line is a leakage detection and protection product with a single function, and does not have centralized management of leakage signals. The operating time of the ...

AI Technical Summary

Problems solved by technology

[0002] In the 380 / 220V low-voltage power supply lines of the prior art, especially for 220V single-phase AC power, due to the wider application occasions, the large number of users, and the different awareness and skills of users in safe use of electricity, when the line When leakage occurs, there will be unpredictable leakage accidents and potential safety hazards. The leakage detection used in the prior art is the detection technology of a single leakage signal. When the leakage action value in the line is greater than the set value, the protector will operate. Cutting off the protected line is a leakage detection and protection product with a single function, and does not have centralized management of leakage signals

The operating time of the leakage protector in the prior art is between 20ms and 500ms, and the difference is very large. Generally, the AC leakage signal obtained in the sensor is converted into a stable DC signal, and then the analog / digital conversion is performed. This method in the technology cannot meet the matching with the shortest leakage action time, and in this case, it is also impossible to obtain or accurately process the leakage current signal of the corresponding line

Simultaneously the microprocessor in the prior art is time-sharing to the sampling method of multi-channel analog signal, can't carry out the simultaneous sampling of multi-channel signal, can't capture signal accurately at the same time, is unfavorable for troubleshooting to leakage safety hidden danger, prone to safety accidents

[0003] In addition, for the leakage detection technology of a single circuit, since the design functions are independent, there is a lack of centralized management of leakage signals: multi-channel synchronous detection and recording of leakage signals, action time recording, historical data query

However, since line leakage is a random and unexpected event, and it is unpredictable, the leakage current of this line may trigger its own protection action, or it may not be enough to trigger its own action, while the cumulative leakage current of multiple lines with similar characteristics The current can completely cause the leakage protector of the upper level to leapfrog. At this time, if there is no centralized management function of the leakage signal, the line maintenance personnel will not be able to accurately determine which line or lines are causing the fault. Prolong the troubleshooting time of the line, reduce the efficiency of line maintenance, and increase the occurrence of safety hazards and accidents

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