Intelligent low-voltage power grid comprehensive protector

Abstract

An intelligent low-voltage network comprehensive protection device comprises a moulded case circuit breaker, a power circuit, a leakage analog circuit, a leakage detection circuit, a leakage amplifying circuit, an over / under-voltage sampling comparison circuit, an overcurrent sampling comparison circuit, a tripping operating value parameter adjustment setting circuit, a singlechip U4, a liquid crystal display circuit, an action state alarm circuit, a 485 communication interface and an electric switching on and off control circuit. The device not only has the functions of protecting earth fault, leakage tracking, overload, short circuit, overvoltage, undervoltage, faulted neutral line and the like, but also has the comprehensive function of adjusting the leakage operating values and actuation time, overvoltage and undervoltage operating values, overcurrent operating value and the like in a multi-switching manner, also has the functions of displaying voltage, current, leakage and other data and failure alarming, and further has the network systematic management function of telemetering, telecommunication, remote control and other low-voltage networks.

Description

1. Technical field [0001] The invention relates to an intelligent comprehensive protector in the field of low-voltage electrical appliances, in particular to an intelligent low-voltage power grid comprehensive protector whose leakage action value, overvoltage and undervoltage action value, and overcurrent action value can be adjusted in multiple gears. 2. Background technology [0002] The applicant once designed a "Large Current Intelligent Phase and Amplitude Leakage Comprehensive Protector" (20051000581.6, publication date: 2005.07.27), which includes an air circuit breaker, an opening and closing operating mechanism, a zero-sequence transformer LH, Single-chip microcomputer U2, leakage simulation generation circuit, voltage detection circuit, power supply unit circuit, leakage current display circuit, electric opening and closing control circuit are characterized in that it is also equipped with a multi-stage leakage amplification circuit, and the leakage operating curren...

AI Technical Summary

Problems solved by technology

At present, the known integrated leakage protectors in the field of low-voltage electrical appliances not only have the function of leakage phase detection and amplitude detection, but also have protection and display of ground fault, leakage automatic tracking, overload, short circuit, overvoltage, undervoltage, phase loss, and zero failure. However, it does not have the functions of multi-level adjustable leakage action value and action time, multi-level adjustable over-voltage and under-voltage action value, multi-level adjustable over-current action value, etc. Network system management function of low-voltage power grids such as communication and remote control

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