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Intelligent MCCB trip overall design

Author: YuanYuPeng
Tutor: YanBoï¼›LuoJiangHong
School: University of Electronic Science and Technology
Course: Electronics and Communication Engineering
Keywords: MCCB Intelligent Release Current Protection Fieldbus
CLC: TM561
Type: Master's thesis
Year: 2008
Downloads: 349
Quote: 1
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Abstract


Molded case circuit breaker is used for connected, breaking power lines and a variety of short-circuit fault load a switching device, is widely used in low voltage distribution systems. Circuit breaker protection is achieved by the release, release should have overload, short circuit, earth, earth leakage fault protection functions. The traditional low-voltage circuit breaker detection unit and the protective function is mostly completed by the electromagnetic component, and the resulting action for a long time, protecting low accuracy, tuning difficulties and other shortcomings, the paper has put forward an improved low-voltage circuit breaker tripping intelligent control unit The principle of measurement and protection algorithms, and carried out the specific hardware and software modules designed to achieve low-voltage circuit breaker intelligent protection, remote control and centralized management. Paper discusses in detail the design principles of intelligent release from the electrical parameters of the sensor to the electrical parameters of the sampling method of calculating with intelligent release from a variety of protection features to achieve these protective properties of the mathematical model. On this basis, identified by its peripheral function unit MCU system design principles. Through integrated hardware and software system designed to achieve intelligent controller measurement, monitoring, control, communications and protection functions. This paper discusses in detail the various modules of the hardware and software design principles. In this issue, intelligent release on hardware produced by Atmel Atmega16 core processor, mainly for real-time data acquisition and processing and circuit breaker failure protection. Software program portion of the modular design approach, the use of assembly language programming, and both hardware and software from a number of improvement measures taken to improve the intelligent release stability and reliability. For MCCB current transformer saturation at high currents problem, a current transformer software correction method, and gives the measured and fitted data, corrected results show that the method is accurate and reliable, In practical applications simplifying design. Optional RS-485 serial communication standard bus interface, serial data communication using low-voltage electrical communication interface for the design of low-voltage electrical communication technologies can be studied. Using the Modbus protocol to achieve a smart field trip two-way communication with the host computer, reaching remote telemetry, remote reconcile the purpose of remote control, making it more consistent with the power system of information, intelligence and networking requirements.

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CLC: > Industrial Technology > Electrotechnical > Electrical > Electrical switches,circuit breakers > Breaker
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