Intelligent terminal unit for SPD

Abstract

The invention discloses an intelligent terminal unit for an SPD. Online dynamic monitoring of an ageing failure of the SPD is achieved and the using requirement of unattended operation is met. The intelligent terminal unit for the SPD comprises a core processor, wherein the core processor is connected with a backup protection monitoring unit, a heat tripping monitoring unit, a temperature monitoring unit, a lightning stroke times monitoring unit and a remote communication unit separately; the core processor is also connected with a micro current monitoring unit; a ground wire or phase line connection line passes through a micro current transformer; a secondary side of the micro current transformer is connected with the micro current monitoring unit via a signal; a power supply end of the micro current transformer is connected with a +12V DC power supply and a -12V DC power supply provided by the micro current monitoring unit; and the remote communication unit comprises an RS485 bus or an Ethernet communication interface to achieve communication with an upper computer.

Description

Technical field [0001] The invention belongs to the technical field of SPD intelligent monitoring systems, and specifically relates to a DPS intelligent terminal unit. Background technique [0002] SPD is widely used to protect against lightning surges. Due to lightning aging or normal aging, SPD should be automatically separated from the power distribution system. Although SPD has a built-in aging thermal trip device and a backup protection device is installed on its upper end, when SPD is aging, the thermal Overheating and burning of SPDs occur from time to time due to the failure of tripping and backup protection. SPD aging failure is a dynamic change process, and its ground leakage current will gradually increase with aging, and finally fail. The existing SPD online monitoring only monitors the temperature of the SPD, and does not monitor the SPD leakage current in real time. , It is impossible to dynamically monitor SPD aging failure online, and cannot meet the requirements...

AI Technical Summary

Problems solved by technology

[0002] SPDs are widely used to protect against lightning surges. Due to lightning aging or normal aging, SPDs should automatically disconnect from the power distribution system. Although SPDs have built-in aging thermal tripping devices and backup protection devices are installed on their upper ends, when SPDs age, the thermal The phenomenon of SPD overheating and burning due to tripping and backup protection failure occurs from time to time

SPD aging failure is a dynamic change process, and its ground leakage microcurrent will gradually increase with aging, so that it will eventually fail. The existing SPD online monitoring only monitors the temperature of the SPD, but does not monitor the leakage microcurrent of the SPD in real time. , it is impossible to dynamically monitor SPD aging and failure online at all, and it cannot meet the requirements of unattended

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