基于双CPU智能电导盐密仪的设计与实现

为了防止高压输电线路污闪事故的发生,定期进行绝缘子等值附盐密度的测试,根据测试结果指导线路的清扫工作是非常重要的,针对这一问题,设计了基于双处理器电导盐密测量仪,详细说明了测量原理、硬件构成和软件的设计方法,该仪器能够在进行盐密测量的同时对其温度和电导率等几项技术指标同时进行测试,而且精度高,反映速度快,满足了实际测量的需要.     

嵌入式手持智能盐密测试仪开发

本论文介绍本盐密测试仪的设计亮点,分析嵌入式手持智能盐密测试仪的设计原理与思路,以及软件设计的注意点。     

复合绝缘子积污特性及其灰色预测方法研究

复合绝缘子由于具有优异的憎水恢复和迁移性能,在防污闪方面发挥了巨大的作用,但在污秽、紫外辐射、放电、温湿度等现场复杂因素的长期作用下,复合绝缘子硅橡胶绝缘材料逐渐老化,而老化后的复合绝缘子积污性能却有待验证。因此,展开了老化复合绝缘子积污特性与预测研究。首先,以新型与老化、大伞与小伞型组合的4类绝缘子为样品,开展了10期自然积污试验。通过试验结果,分析了每一类复合绝缘子的积污特性,研究发现：运行了10年的老化复合绝缘子表面盐密大于新复合绝缘子,以大伞型复合绝缘子的第10期盐密为例,老化复合绝缘子表面污秽度比新复合绝缘子表面污秽度增加了0.022 9 mg/cm²,增加率为39.41%。此外,大伞型复合绝缘子表面污秽度大于小伞型复合绝缘子。最后根据灰色理论的原理,建立老化复合绝缘子积污预测模型,模型预测结果与试验结果吻合度较高。     

嵌入式手持智能盐密测试仪开发

本论文介绍本盐密测试仪的设计亮点，分析嵌入式手持智能盐密测试仪的设计原理与思路，以及软件设计的注意点。     

绝缘子检测机器人运动控制系统设计

针对绝缘子检测机器人运动控制系统设计,讨论了系统组成,设计了绝缘子的检测机器人运动控制系统设计.改变了人工检测绝缘子劳动时间长,危险性高,检测效率低的现状.探讨了绝缘子检测机器人运动控制系统,设计了软件实现方法和流程;随着智能电网概念的提出和发展,一种可以替代人工进行绝缘子检测的机器人成为电力系统发展的需求.本文在设计了绝缘子自由移动的机器人,该机器人可搭载现有的检测设备,完成绝缘子串的零值检测任务.     

太阳能环境参数测试仪的系统设计

介绍了一种基于AT89S52单片机的太阳能环境参数测试仪,详细阐明了环境参数测试仪的软硬件设计与实现方法。该测试仪能对温度、湿度和照度进行实时测量显示,并通过RS485工业总线将采集数据传送至远端上位机。     

轻量级YOLOV3的绝缘子缺陷检测方法

绝缘子是输电线路的重要组成部分,其能否正常工作直接影响电网的稳定运行。为此,研究了智能绝缘子缺陷检测方法。通过无人机的航拍图像制作数据集,利用K-means++算法确定先验框,基于YOLOV3检测架构构建一种改进的轻量级网络。实验结果表明,该方法提升了高清绝缘子的图像检测速度,且能够完成绝缘子定位及缺陷检测。     

用MB1504实现寻呼机测试仪中的频点设置

介绍在单片机AT89C52的控制下,用锁柏环频率合成芯片MB1504设置寻呼机测试仪中的发射频点,以实现寻呼机测试仪与寻呼机之间的空中接口。     

油井参数测试器下放深度测试仪的研制

以89C52单片机为核心构成的油井参数测试器下放深度测试仪的软、硬件设计,该测试仪与油井参数取样测试器配套使用。并介绍了使用汽车蓄电池的单片机电源系统的设计。经现场实用验证,该方案具有可行性。     

基于先验知识的航拍绝缘子检测方法

在架空输电线路中对带电状态的绝缘子进行检测和故障定位,对保证电网可靠运行具有重大意义。基于无人机平台提出一种复杂背景条件下的绝缘子检测算法。在检测算法的特征提取层引入注意力机制模块以获取更多的绝缘子特征信息,同时利用航拍图像中绝缘子的先验知识,结合K均值聚类算法改进目标候选框的生成模式。在此基础上,通过将中心损失引入绝缘子检测目标函数以增强训练过程中绝缘子类内特征的内聚性。实验结果表明,相对Faster R-CNN检测算法,在绝缘子检测数据集上Faster R-CNN改进算法检测精度提高4%以上。     

Accurate decision-making for timely washing of substation insulators, based on a pollution model

Substation insulators near coastal areas rapidly become polluted due to the salty wind blowing in from the sea. Hazardous levels of pollution deposit cause higher leakage currents under damp conditions, resulting in system blackouts and damage to substations due to flash-overs. This research is aimed at developing a method of reliable decision-making to determine the time at which to wash polluted insulators to avert detrimental conditions. The proposed method consists of modelling the pollution deposits, and deciding on the best time to wash the insulators by using the actual data related to pollution deposits and weather information. The effectiveness of the proposed method is demonstrated by applying it to actual data taken at the Karatsu substation in Japan.     

水污染淤积密度指数自动在线测试装置

基于反渗透原理,以89C52单片机为控制器,设计了水污染指数中的淤积密度指数(SDI)的自动在线测试装置。该系统可以实现SDI的自动测量、超标报警和结果显示。利用89C52具有的串行通信功能,设计了RS485接口电路,实现数据远传功能。介绍了SDI自动在线测试装置的自动测量工艺流程。实际使用证明自动测量减少了人工测试带来的误差和不便,提高了测量的可靠性。     

基于DTMF的解码器设计

本文介绍了DTMF解码芯片MT8870的功能和特点，给出了在解码器中占89C51单片机的接口电路，说明了解码器的工作原理抗干扰措施。     

Impact of thermal contact resistances on micro-gap heat losses for microthermionic power generators

Thermionic power generation is a safe and clean energy source that allows for converting heat into electrical energy using thermionic electrons. The miniaturization is an advantage of this technology that led to the recent development of micro-gap thermionic power generators. In this work, thermal contact resistances between the micro-gap insulators and the emitter as well as between the micro-gap insulators and the collector are measured. A thermal resistance of 48.6 K/W is obtained by downsizing the insulators until 60 × 45 μm² of contact area with the emitter, demonstrating a high impact for decreasing the micro-gap conduction heat loss density from the emitter to the collector from 28 W/cm² (theoretical value obtained without considering contact resistances) to 5.6 W/cm². Downsizing the contact area between the insulators and the emitter from 320 × 300 to 60 × 45 μm² leads to an increase of the power conversion efficiency from 9.1 × 10^?5 until 1.5 × 10^?3.     

Development of a Novel Live-Line Inspection Robot System for Post Insulators at 220-kV Substations

Based on investigating existing on-line detection methods for energized ceramic post insulators, this paper proposes a new live-line work robot involving ultrasonic detection for flaws in porcelain post insulators at 220-kV high-voltage (HV) substations. Owing to the HV, strong electromagnetic field and space conditions, the robot would be a special one. Thus, on the basis of studying correlative technologies — mechanism design, visual alignment and location, HV insulation, electromagnetic compatibility, automatic control, and wireless communication — each part of the robot system is designed and analyzed. The experiment and trial operation results show that the designed robot can work normally in 220-kV substations, and cracks in porcelain post insulators can be detected effectively, safely and conveniently by the robot.     

矿用一氧化碳传感器的设计

根据矿井一氧化碳浓度检测的实际情况,文章介绍了一种以单片机AT89S52为核心的传感器的设计,实现一氧化碳浓度的数字化、智能化检测。传感头采用电化学式感应原件,硬件电路由显示电路、频率输出电路、声光报警电路、A/D转换电路、前置放大电路、红外接收电路组成。为了便于调试、连接和扩展,软件采用模块化程序设计技术,彼此间具有相对的独立性。     

基于STC89C52单片机的指环脉博测量仪设计与实现

脉搏测量是医疗护理基本监测工作之一,传统脉搏传感器多采用的是比如指脉、耳脉等方式,但具有难以有效维护、数据不精确等弊端;为有效解决上述问题,设计了一款基于STC89C52单片机的指脉测量仪,运用红外对管传感器以及光电转换,感知手指的微弱波动实现信号接收;该设计采用STC89C52单片机作为控制器核心,通过心率传感器来输出方波,当单片机收到相应脉冲波,数码管即可进行计数向接收端发送信号,达到脉搏测量仪计数和监控功能;调式与实际验证,该设计的脉搏测量仪与听诊器比,绝对误差为1.1,相对误差为0.9%,通过相关的调试使用,该脉搏测量仪成功实现了设计时的相应功能,具有潜在应用推广价值。     

Boundary methods for the analysis and design of high-voltage insulators

The paper demonstrates the application of the method of boundary integral equations and boundary elements to the analysis of the potential distribution on high-voltage insulators with clean and contaminated surfaces. Two formulations are presented: (1) a direct formulation giving the potential on the dielectric/air boundary in terms of the charges on the conducting surfaces, and (2) an indirect approach in terms of an equivalent charge distribution on all surfaces. The integral equations are Fredholm integral equations of the second kind in the first case and a combination of Fredholm equations of the first and second kind in the second case. For geometries with rotational symmetry, the equations become one-dimensional. The corresponding formulation using the method of charge simulation is presented. For contaminated dielectrics, the additional constraint of zero net charge on each conducting strip gives the additional equations required to relate the unknown potentials of the strip.

The indirect formulation is used to exemplify the analysis of clean and contaminated rod-type insulators. The results are compared with those obtained by the method of charge simulation.     

中规模集成电路功能测试仪的设计

设计了一款针对学校实验室常用的中规模集成电路芯片的功能测试仪。测试仪的核心AT89C55单片机管理和控制整个测试流程,对测试数据进行处理、判断,并通过LCD、LED显示和指示其测试结果。详细介绍了测试仪的总体设计思路,给出了ADC0809、DAC0832、LM555、SG3524等芯片的详细测试电路图。     

一种基于89C52的新型风压测量仪的研制

该仪器是基于89C52的单片机系统,采用12位AD574A转换器,针对现有风压测量仪器功能上的不足,实现了实时送显和平均送显功能,满足了测量风压时不同情况下的使用要求,尤其适用于风机系统管道内各种压力参数的测量.系统设计了RS232通讯接口,为进一步开发风机性能测试系统奠定了基础.