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Multi-channel data acquisition and implementation of fiber optic communication systems

Author: WangZuo
Tutor: JiangFengXian
School: Fudan University
Course: Communication and Information System
Keywords: Distributed data acquisition Dielectric loss factor Online Monitoring Harmonic transform method Optical Fiber Communication
CLC: TP274.2
Type: Master's thesis
Year: 2008
Downloads: 393
Quote: 0
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Abstract


With sensors, optical, computer and information processing technology, data acquisition systems rapidly in various fields has been applied. This paper studies the data collection system in high-voltage equipment insulation condition monitoring fields. By brief pressure capacitive insulation monitoring device concept, importance and development status, pointed out to characterize the state of the high-voltage equipment insulation characteristic quantities, especially for online monitoring of dielectric loss factor significance and necessity. To solve this problem, this paper proposes and implements a high-voltage equipment insulation condition for on-line monitoring and analysis system. System uses a distributed architecture, the integrated use of the bus communication and optical fiber communication technology, digital signal processing technology, computer technology, the realization of multi-channel high-voltage substation equipment in situ digital signal acquisition, intelligent, multi-site by fieldbus a data acquisition unit and network communication between the control room, you can put multiple devices, real-time monitoring of data collection to the top of the data management software and expert diagnosis system, to achieve the status of a plurality of electrical equipment insulation on-line monitoring and diagnostics. The main work is reflected in the following aspects: (1) based on several common dielectric loss factor analysis and comparison of monitoring methods, this paper presents the system uses dynamic sampling frequency harmonic analysis, and for the frequency fluctuation monitoring results of the simulation done. (2) Through the common centralized and distributed systems architecture analysis and comparison, proposed a distributed data acquisition and combination of optical fiber communication system structure. Designed a two-fiber bidirectional optical fiber communication systems and photoelectric conversion module, achieved a strong side and weak side electrical isolation. (3) design of the data acquisition unit. Data acquisition unit uses a different signal sampling methods and the protection circuit, the signal will be converted into high-precision A / D conversion circuit, and in the DSP2812 core processor under the control of multi-channel signal synchronous sampling and data processing. (4) is designed based on RS-485 bus layered communication protocols, multiple data acquisition unit and the control room is formed between the host PC master-slave communications network. Detailed discussion of each layer protocol functions and how to ensure a reliable method of communication. Also designed with optocoupler isolated RS485 interface circuit and lightning protection circuitry. (5) using object-oriented thinking and modular design method, a set of visual design, integrated monitoring and management software. Monitoring data acquisition unit for monitoring and providing data storage, display, analysis and other functions. (6) On-site installation and the actual running this online monitoring system, made a lot of operating data and operating data for these analyzes and research. The power system project identification group experts, that the online monitoring system is stable, monitoring data authentic, recommended that the monitoring system in the power system application.

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CLC: > Industrial Technology > Automation technology,computer technology > Automation technology and equipment > Automation systems > Data processing, data processing system > Data collection and processing systems
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