10-04-2017, 08:15 PM
literature survey of microcontroller based electronics circuit breaker
Abstract
Nowadays, electrical accidents to the line man are increasing, while repairing the electrical lines due to the lack of communication between the electrical substation and maintenance staff. This project gives a solution to this problem to ensure line man safety. In this proposed system the control (ON/OFF) of the electrical lines lies with line man.This project is arranged in such a way that maintenance staff or line man has to enter the password to ON/OFF the electrical line. Now if there is any fault in electrical line then line man will switch off the power supply to the line by entering password and comfortably repair the electrical line, and after coming to the substation line man switch on the supply to the particular line by entering the password. Before going to know about this circuit, also read the interesting post: Password based door locking system.
Introduction
The system aims to shut down the power supply as soon as it is overloaded. Current versions circuit breakers consist of MCB based circuits that operate on a thermal bimetal trip mechanism. The technique is quite slow and depends upon the overloading percentage.
The project is designed to sense system voltage drops and then constantly compare them with the default voltage drop presets using a level comparator in order to generate a load tripping output.The electronic circuit breakers were built keeping in mind that MCB based systems take a quite long time to trip. So it becomes important that the trip time be as short as possible in order to protect the sensitive loads.The project actively shows us how an instant tripping can be achieved. These load tripping systems are based on the concept of measuring voltage drop through a series element in proportion to load current.The measured voltage is constantly measured by converting to dc and compared to predefined voltage by a level comparator in order to generate output capable of driving a relay through MOSFET for load tripping. The Instant circuit breaker system made using 8051 microcontroller is a lot faster as compared to traditional thermal MCB based system.