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拆卸后的元器件分解如图1所示。1.旋转机座的拆卸方法旋转机座的拆卸如图2所示。拆卸步骤如下:(1)拆下两个固定螺钉,如图2中(a)所示。(2)取下旋转基座。(3)拆下四个垫片。(4)从后机壳里拆下四个螺钉,如图2中(b)所示。 相似文献
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③2023B-T驱动板的TTL插口CN3(45个脚)、CN4(30个脚)用于驱动45+30屏线接口的液晶面板,CN3(45个脚)、CN2(30个脚)的引脚排列顺序如图4所示。引脚功能分别见表7、表8所示。(3)GM5621驱动板GM5621驱动板的主控芯片为GM5621,实物图如图5所示。该驱动板的主要特点是:具有DVI数字输入接口,能够接收DVI数据信号,支持LVDS(低压差分信号)接口液晶面板,主要参数如下:①输入接口类型:VGA模拟RGB输入和DVI 相似文献
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国际电工委员会(lEC)第49届年会85年5月在加拿大蒙特利尔举行,由42个国家1223名代表参加了46个技术委员会(TC)和分技术委员会(SC)会议及50多个工作组(WG)会议。我国代表团由35人组成。 相似文献
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正6月28日,中国家用电器协会美健(个护)电器专业委员会成立发布会暨行业发展高峰论坛在北京举行,中国美健(个护)电器行业首个专委会正式宣告成立。中国家用电器协会理事长姜风表示,中国家用电器协会成立专委会,希望通过该平台让美健(个护)电器行业更加健康有序快速地发展,提高市场关注度,共同做大蛋糕。会议期间,中国家用电器协会还发布了《2018美健(个护)电器行业研究报告》(以下简称《报告》),这也是中国美健(个护)电器行业的首份研究报告。 相似文献
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四、四端功率表(或相位表)的附加干扰量功率表(或相位表)有电流和电压回路各一。若两回路有一个公共端,则共有三个端。该功率表(或相位表)将仅能反映电压和电流的作用。但许多情况下功率(相位)表不得不按四端线路处理,这时将有第三个干扰量作用于功率(相位)表而引起示值误差。一种情况是功率(相位)表内部电压回路和电流回路已相接,而且四个端的电位是不同的。 相似文献
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国际电工委员会电气绝缘材料与系统评定委员会(IEC TC112)成立于2007年,由原国际电工委员会的绝缘材料测试方法(IEC TC15E)和电绝缘系统(IEC TC98)合并成立,职责是负责电气绝缘材料与系统评定方法的国际标准化。目前,IEC TC112拥有成员国30个,其中P成员国20个、O成员国10个。国内技术对口标委会为全国电气绝缘材料与绝缘系统评定标委会(SAC/TC301)。一、IEC TC112的组织架构IEC TC112组织结构中拥有8个工作组(WG),目前有2个项目维护组 相似文献
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1引言从控制中心连接到各系统传递信号或控制操作功能的电缆统称控制和仪表电缆。在20世纪60年代前,即使大型工程建设的自动化控制系统,也都采用传统聚氯乙烯绝缘控制电缆和信号电缆,电缆的主要功能是连接继电器、断路器、指针式仪表和信号灯、开关设备、报警及连锁系统等。近年来,由于弱电和计算机网络的广泛应用,现代工程建设的全面自动化和高精度控制,对控制和仪表电缆的选择和应用提出了新的功能和更高的功能要求(如为满足抗干扰要求对电缆进行对绞屏蔽结构处理等)。文中就近年来控制电缆的选择和使用中出现的一些新问题加以研讨。2控制… 相似文献
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XLPE电缆及接头局部放电的超高频测量与分析 总被引：11，自引：0，他引：11
超高频的局部放电测量是目前国外电力设备绝缘检测研究的焦点问题之一。本文建立了一套超高频局部放电的测量系统，设计了XLPE电力电缆及其接头局部放电超高频测量的电容耦合传感器，分析了传感器的等效电路，测量了其频率响应，对电缆以及接头中的实际放电进行了测量分析。 相似文献
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Industrial plant engineers are required to provide a safe and reliable electrical cable infrastructure that will assure maximum uptime at the lowest possible cost. As the electric systems age and the availability of maintenance crews decrease, reliability of the entire system is at risk. To ensure continued reliability, industrial sites are engaged in the decision process to either replace the cable, which is very costly, or repair it at discrete locations to extend its life. In addition, the reliability of new systems must be assured. The engineers assigned with this responsibility are able to make better power cable system reliability decisions when the predictive defect-specific diagnostic tool described in this article is applied. 相似文献
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Chu H. Ghafurian A.R. Maguire K.J. Parmigiani B. Walker J. 《Power Delivery, IEEE Transactions on》1992,7(4):1718-1723
The authors describe the successful development of a 138 kV transition joint between high-pressure dielectric-fluid-filled cable with paper insulation and cable with extruded insulation, such as cross-linked polyethylene or ethylene propylene rubber. Such a joint must have adequate electrical and mechanical properties and contain the high-pressure dielectric fluid normally at 1400 kPa. For evaluation of the transition joint, the IEEE standard 404-1986 for laminar-to-laminar cable joints and extruded-to-extruded cable joints was considered, along with many of the specified types of tests included, such as high-voltage AC and DC, hot impulse to BIL, cyclic aging, and corona. The test results are reported 相似文献
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1 运行管理的基本任务电缆线路的运行管理工作是多方面的 ,其最基本的任务就是要确保电缆线路安全供电和减少事故发生。基本任务可以归纳为以下两方面。1 .1 使电缆适应电网和用户供电的需求电缆运行管理部门必须严密监视电缆设备的运行状态 ,使电缆线路始终适应电网和用户供电的需求 ,运行管理人员要使管辖范围的电缆线路处于受控状态。电缆的绝缘、导体和护层这三大组成部分 ,必须符合运行要求。( 1 )绝缘一定要合格。电缆及其附件的绝缘 ,必须与电网的绝缘水平相匹配 ,它的 U0 /U要与系统的中性点接地方式相一致。而且 ,绝缘要有一定… 相似文献
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《Electrical Insulation Magazine, IEEE》1988,4(4):16-23
The large numbers of failures of primary underground residential distribution (URD) cables that utilities are experiencing is addressed. The major problems are defined and discussed and methods are suggested whereby the utility cable engineer could best find solutions. The problems and decisions fall into two general categories: those that concern existing in-service cables, and those that concern future URD cable designs. The discussion of existing cables covers cable replacement criteria, estimation of life remaining, cost-effective replacement methods, and concentric neutral corrosion. The discussion of future cables covers insulation selection, cable/conduit design, and life expectancy (the first two issues apply to replacement cables as well) 相似文献
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Research has been conducted into ways of enabling wiring operations to be performed on overhead power lines without shutting off the power. This research has culminated in the development of a method called the bypass cable method. One of the bypass cables used in this method has a built-in polyaramide resistor for additional strain resistance, providing greatly improved performance. The development and spread of the bypass cable method has enabled work-related power shut-offs to be reduced to one-fourth the number required five years beforehand, and each year this level continues to decline 相似文献
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Power cables laid in underground ducts may experience movement in the direction of dominant traffic flow. This phenomenon, so-called cable creepage, has been known for a long time but its mechanism has not been clearly understood yet. In this paper, an exact mechanism of creepage phenomenon is proposed in which cable creepage is interpreted as an accumulation of relative frictional slip developed in the process of kinematic interaction between the flexible cable and the duct which experiences deformation propagating into the vehicle traffic direction. This kinematic interaction is formulated as frictional contact problem and an appropriate analysis method is developed. It is confirmed from the calculated results that creepage can occur according to the proposed mechanism 相似文献