On-line monitoring early-warning device for SPD

Abstract

The invention discloses an on-line monitoring early-warning device for an SPD, and the device comprises an operation statistics module, an inrush current sensing module, a voltage sensor, a current leakage sensing module, a temperature collection module, and a processing module. The processing module is connected with the operation statistics module, the inrush current sensing module, the voltage sensor, the current leakage sensing module and the temperature collection module. The device provided by the invention collects the total number of operation times of the SPD, the inrush current of the SPD, the loading voltage of the SPD, the leaked current of the SPD and the surface temperature through the operation statistics module, the inrush current sensing module, the voltage sensor, the current leakage sensing module and the temperature collection module, thereby achieving the comprehensive collection of all parameters of the SPD, and laying a foundation for the estimate prejudgment of the SPD. According to the current and voltage values collected by the inrush current sensing module and the voltage sensor, the device calculates the actual impedance of the SPD, and prejudges the electrical performances of the SPD through comparing the actual impedance with a preset impedance threshold value and combining the comparison results with the leaked current of the SPD.

Description

technical field [0001] The invention relates to the technical field of lightning protection, in particular to an SPD online monitoring and early warning device. Background technique [0002] With the rapid development of microelectronics and electronic technology, microelectronic systems such as communication, measurement, and computer network with large-scale integrated circuits as the core have been widely used in various fields of modern industry, agriculture, national defense, science and education, and people's lives. In recent years, system paralysis and equipment damage caused by lightning abound, resulting in countless human and material losses. Therefore, lightning disasters and lightning protection technology have received widespread attention from all walks of life. [0003] Surge Protective Device (SPD, Surge Protective Device) can discharge a large amount of pulse energy generated by lightning into the ground in the shortest time, so as to protect electronic eq...

AI Technical Summary

Problems solved by technology

In the long-term use of SPD, due to various stresses (electrical, thermal, mechanical or their combined effects), components such as piezoresistors will undergo various damages or performance degradation and aging, such as piezoresistors short circuit, open circuit damage, varistor voltage drop or leakage current rise, etc., will lead to temperature rise, causing the varistor to age to failure, resulting in increased leakage current and failure of the protection function. In severe cases, device explosion may occur , fire, resulting in accidents and losses

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