助航灯光绝缘电阻实时在线监测单元的设计与实现
发布时间：2018-12-10 14:38
【摘要】：机场助航灯是保障飞机在特殊环境下安全起降的必要目视助航设施。为了保障机场助航灯的正常运行,需要实时监测灯光回路的绝缘状况是否良好。因此对助航灯光电缆回路绝缘电阻实时在线监测单元的研究与设计具有重要意义。但是目前现有的绝缘电阻在线监测方法存在一些缺陷,无法达到实时在线准确监测绝缘电阻的目的。本文首先介绍了国内外绝缘电阻在线监测研究现状和现有的方法,从理论上论证了其局限性和缺陷。针对其主要的缺陷,提出了一种新型助航灯光电缆回路绝缘电阻实时在线监测单元的设计方案,主要有三点:用24V低压直流激励电源,代替现有的高压电源,减小电缆承压;采用开关切换方法,分时采样交流单独作用和交直流共同作用状况下的采样电流,抵消掉因交流高电压产生的干扰影响;采用磁隔离高频交流调制与解调技术,提高隔离等级,保障电路安全。本文详细地从理论上验证了新方法的可行性。首先,构建了灯光回路绝缘电阻等效模型。接着,对比现有方案中的缺陷,一一分析了新方案的优势与可行性。最后,分别列举了几种不同工况下本设计测量结果的可靠性。在硬件电路设计方面,本文采用推挽式变换器为本设计提供磁隔离保护;详细地介绍了推挽式变压器的工作原理,重点介绍了推挽变压器的设计过程。在控制方面,本文采用AT89C51单片机作为智能数据处理控制芯片。在此基础上设计了配套的数据采集、转换、处理以及通讯传输电路。实现了将灯光电缆回路绝缘电阻实时在线监测的功能。在软件设计方面,本文从初始化子程序,定时子程序,绝缘电阻计算子程序以及基于MODBUS的通讯中断子程序几个方面,具体地介绍了主程序及各个子程序的运行过程,并给出了具体软件流程图。绝缘电阻实时在线监控单元采集测量电路中的电流信号,在CPU中对采样信号进行分析与计算,得到实时的绝缘电阻值,之后通过MODBUS通讯网络将绝缘电阻阻值传送给上位机并记录,具有可追溯性,方便及时发现各种问题。
[Abstract]:The airport navigation aid lamp is the necessary visual navigation aid facility to ensure the aircraft to take off and land safely under the special environment. In order to ensure the normal operation of the airport navigation light, it is necessary to monitor whether the insulation condition of the lamp loop is good in real time. Therefore, it is of great significance to research and design the real-time on-line monitoring unit of insulation resistance in navigation light cable circuit. However, the existing on-line monitoring methods of insulation resistance have some defects, which can not achieve the purpose of real-time and accurate on-line monitoring of insulation resistance. This paper first introduces the present situation and existing methods of on-line monitoring of insulation resistance at home and abroad, and theoretically demonstrates its limitations and defects. In view of its main defects, a new design scheme of real-time on-line monitoring unit of insulation resistance in navigation light cable circuit is proposed. There are three main points: 24V low-voltage DC excitation power supply is used to replace the existing high-voltage power supply, and the cable voltage is reduced; The switching method is adopted, the sampling current under the condition of time-sharing sampling AC single action and AC / DC interaction is used to counteract the interference caused by high AC voltage. The magnetic isolation high frequency AC modulation and demodulation technology is adopted to improve the isolation level and ensure the security of the circuit. The feasibility of the new method is verified in detail in this paper. Firstly, the equivalent model of insulation resistance in lighting circuit is constructed. Then, the advantages and feasibility of the new scheme are analyzed by comparing the shortcomings of the existing schemes. Finally, the reliability of the design results under different working conditions is listed respectively. In the aspect of hardware circuit design, this paper adopts push-pull converter to provide magnetic isolation protection for the design, introduces the working principle of push-pull transformer in detail, and emphatically introduces the design process of push-pull transformer. In the aspect of control, AT89C51 microcontroller is used as intelligent data processing control chip. On this basis, a complete set of data acquisition, conversion, processing and communication transmission circuit is designed. The function of real-time on-line monitoring of insulation resistance of lighting cable circuit is realized. In the aspect of software design, this paper introduces the main program and the running process of each subroutine in detail from the aspects of initialization subroutine, timing subroutine, insulation resistance calculation subroutine and communication interrupt subroutine based on MODBUS. The software flow chart is given. The insulation resistance real-time on-line monitoring unit collects the current signal in the measuring circuit, analyzes and calculates the sampling signal in CPU, and obtains the real time insulation resistance value. Then the insulation resistance value is transmitted to the host computer and recorded through MODBUS communication network, which has traceability and convenience to find all kinds of problems in time.
【学位授予单位】：大连交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：V351.3;TM934.31
本文编号：2370752
[Abstract]:The airport navigation aid lamp is the necessary visual navigation aid facility to ensure the aircraft to take off and land safely under the special environment. In order to ensure the normal operation of the airport navigation light, it is necessary to monitor whether the insulation condition of the lamp loop is good in real time. Therefore, it is of great significance to research and design the real-time on-line monitoring unit of insulation resistance in navigation light cable circuit. However, the existing on-line monitoring methods of insulation resistance have some defects, which can not achieve the purpose of real-time and accurate on-line monitoring of insulation resistance. This paper first introduces the present situation and existing methods of on-line monitoring of insulation resistance at home and abroad, and theoretically demonstrates its limitations and defects. In view of its main defects, a new design scheme of real-time on-line monitoring unit of insulation resistance in navigation light cable circuit is proposed. There are three main points: 24V low-voltage DC excitation power supply is used to replace the existing high-voltage power supply, and the cable voltage is reduced; The switching method is adopted, the sampling current under the condition of time-sharing sampling AC single action and AC / DC interaction is used to counteract the interference caused by high AC voltage. The magnetic isolation high frequency AC modulation and demodulation technology is adopted to improve the isolation level and ensure the security of the circuit. The feasibility of the new method is verified in detail in this paper. Firstly, the equivalent model of insulation resistance in lighting circuit is constructed. Then, the advantages and feasibility of the new scheme are analyzed by comparing the shortcomings of the existing schemes. Finally, the reliability of the design results under different working conditions is listed respectively. In the aspect of hardware circuit design, this paper adopts push-pull converter to provide magnetic isolation protection for the design, introduces the working principle of push-pull transformer in detail, and emphatically introduces the design process of push-pull transformer. In the aspect of control, AT89C51 microcontroller is used as intelligent data processing control chip. On this basis, a complete set of data acquisition, conversion, processing and communication transmission circuit is designed. The function of real-time on-line monitoring of insulation resistance of lighting cable circuit is realized. In the aspect of software design, this paper introduces the main program and the running process of each subroutine in detail from the aspects of initialization subroutine, timing subroutine, insulation resistance calculation subroutine and communication interrupt subroutine based on MODBUS. The software flow chart is given. The insulation resistance real-time on-line monitoring unit collects the current signal in the measuring circuit, analyzes and calculates the sampling signal in CPU, and obtains the real time insulation resistance value. Then the insulation resistance value is transmitted to the host computer and recorded through MODBUS communication network, which has traceability and convenience to find all kinds of problems in time.
【学位授予单位】：大连交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：V351.3;TM934.31
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