Composite electrical fire monitoring detector and monitoring method thereof

Abstract

The invention provides a composite electrical fire monitoring detector and a monitoring method thereof. The monitoring detector comprises an input voltage detector, a residual current transformer, a first current transformer, a second current transformer, a third current transformer, a fourth current transformer, a temperature sensor, a first resistance-capacitance filter network, a second resistance-capacitance filter network, a third resistance-capacitance filter network, a 4th resistance-capacitance filter network, a 5th resistance-capacitance filter network, a 6th resistance-capacitance filter network, a two-channel analog front end, a four-channel analog front end, an amplification filtering unit, a microprocessor, an output control and LED indicating unit, a liquid crystal display unit, an NB-IOT module unit, a storage unit, an RS485 communication interface unit and an AC / DC power conversion unit. The monitoring method is realized by using the monitoring detector. Therefore, false alarming caused by the common mode interference signal is reduced; the accuracy of the residual current and three-phase current effective value measurement is improved; and the high measurement accuracy of the high-low-end signals is ensured while the measurement range is extended.

Description

technical field

[0001] The invention belongs to the field of electrical fire protection, and in particular relates to a composite electrical fire monitoring detector and a monitoring method thereof. Background technique

[0002] In recent years, my country's electrical fires have been in a high-occurrence situation, and caused heavy casualties and property losses. For this reason, we have been devoting ourselves to the research work on electrical fire protection related topics for many years. We have carried out in-depth investigation and research on the problems that the current electrical fire monitoring products are relatively prominent in practical applications. Through the subject research in the past two years, we found that the existing products in the market generally have problems of false positives, negative negatives, or system paralysis. Analysis of the main reasons can be summarized as follows: 1. At present, most electrical fire monitoring systems are install...

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