隔离开关

Later, it makes some comparison with four kinds of modulation technique, and finally, it implements the three-level PWM switching power amplifier with the PWM technique. The power of the amplifier is 2kVA, and the frequency bandwidth is 10～3kHz. In the thesis, the author designs and makes the hardwares of the switching power amplifier. The hardwares contain power inverter rank circuit, control system circuit based on DSP, drive and isolation circuit, and protective circuit. The thesis also analyses the potential safety problems and put forward some solutions for the problems. Furthermore, the thesis accomplishes the software design of the control system, and successfully debugs it. The methods of designing higher power ampilfier are also discussed in the thesis. It analyses the feasibility of the methods, outlines the way of how to design higher power switching power amplifier, and does some experiments with the method of switches-parallelling.

根据电动振动试验系统对开关功放的要求，提出了以电感电流瞬时值控制技术为基础的三电平脉宽调制开关功放的设计方案，并通过系统仿真进行了原理性论证；然后设计并制作了开关功放的硬件，包括功率转换电路，基于DSP的控制电路，驱动、隔离电路以及保护电路；针对开关功放数学模型不易得出的特点，细致分析了模糊自适应PID控制方法，在此基础上编写了控制程序；研制出一台功率为2kVA，通频带为10～3kHz的三电平脉宽调制开关功放；论文中还探讨了实现大功率开关功放的方法，分析了各种方法的可行性，给出了实现大功率开关功放的思路，并进行了并联开关管实现大功率开关功放的实验。

This paper, based on above analysis and research, suggests the insulation level of the main equipment in UHV system (including transformer, circuit breaker, disconnecting switch, reactor and MOA), which can be used as a references to research, manufacture of UHV equipment and design of power substation and transmission line.

在此基础上，对特高压系统的主要变电设备(包括变压器、断路器、隔离开关、电抗器和MOA)和输电线路的绝缘水平提出了建议，以供我国特高压设备研制和线路变电所设计参考。

Its main products cover more than 20 series and 200 kinds of products like all sorts of suspension insulator (including ANSI52),middle and high voltage needle insulator (including ANSI55、56) and porcelain insulator below 30 tons, and various kinds of support, sleeve, drop-type fused cutout, lighting conductor and disconnecting switch below 500 kilovolts. All these products with completed series are well sold in China mainland also furthers sold to Europe, America Southeast, Asia, Middle East, South America, Hong Kong and Macao.

现有主要产品：30吨以下各种悬式绝缘子（包括美标52系列），中、高压针式绝缘子（包括美标55、56系列），瓷横担绝缘子，500千伏以下各种支柱、套管、跌落式熔断器、避雷器及隔离开关电器等二十多个系列二百多个产品，品种系列齐全，产品畅销全国各地，远销欧美、东南亚、中东、南美及港澳地区。

Cable accessories, distribution boxes, composite insulators, lightning, isolation switch, such as transmission and distribution products business, with professional productionêhistory, for China and around the world provide users with more than 3000 kinds of electrical products.

电缆附件，分接箱，复合绝缘子，避雷针，隔离开关，等输配电产品的生产企业之一，拥有二十三年的专业生产历史，为中国及世界各地的用户提供三千多种电力产品。

The main content has the bus, enters the going beyond a line, the circuit breaker, the isolator, as well as the electric current and the voltage transformer choice.

主要内容有母线、进出线、断路器、隔离开关、以及电流和电压互感器的选择等。

The results show that the maximum gradient voltage of 1 to 3 winding pies will exceed the critical value under the condition where the isolating switch operates in mode 3 and the transformer is charged.

结果表明，变压器带电、变压器侧的隔离开关操作(方式3)的1～3个线饼的最大梯度电压超过允许范围，因此要避免方式3的操作。

A design of controller using TIMSP430F149 for three-position isolation switch is presented.

在中高压电力系统中，由于三工位隔离开关的操作力矩较大，为了实现由外部保护装置控制，必须采用电动机操纵。

The main products available: 30 tons of the following kinds of Suspension Insulator (including American Standard 52 series), medium and high voltage insulators needle (including the American Standard Series 55,56), Tam Wang porcelain insulators, 500 kV, the following types of pillars, casing, drop-style fuses, surge arresters and electrical isolation switches, etc. more than 20 series over 200 products, varieties Series complete, best-selling products all over the country, exported to Europe, America, Southeast Asia, the Middle East, South America and Hong Kong and Macao regions.

现有主要产品：30吨以下各种悬式绝缘子(包括美标52系列)，中、高压针式绝缘子(包括美标55，56系列)，瓷横担绝缘子，500千伏以下各种支柱，套管，跌落式熔断器，避雷器及隔离开关电器等二十多个系列二百多个产品，品种系列齐全，产品畅销全国各地，远销欧美，东南亚，中东，南美及港澳地区。

Then compare the5 drafts from these aspects such as reliability, flexibility andeconomy, and keep two more reasonable plans than others. The shortcircuit current calculation is carried on.. And main electricequipments including circuit breakers、disconnectors、bus、insulatoretc are choosed according to the result of short circuit currentcalculation. Finally the economy of these two plans are comparedand main electrical connection plan is determined.

然后对这五种方案进行可靠性、灵活性和经济性比较后，保留两种较合理的方案，对这两种方案进行短路电流计算；接着是根据短路电流计算结果进行主要电气设备的选型以及校验，包括断路器、隔离开关、母线、绝缘子等；最后再由经济性比较确定最终的电气主接线方案。

From the burden increased aspect clarify set upthe necessity of station, then pass to drew up to set up generalizeof transformer substation and line direction to consider, and passto analysis of carry the data, safety, economic and dependableconsider and made sure the 110 kV, 35 kV, 10 kV and station useelectricity of lord connect line, then again through burdencalculation and power supply scope made sure main number, capacityand model number of the transformer set, also in the meantime makesure the station uses capacity and model number of transformer,end, according to biggest keep on work electric current and shortcircuit calculating of calculation result, to the high pressureRong break a machine, insulate a switch, female line, insulate sonand wear a wall set tube, electric voltage with each other feelingmachine, electric current with each other the feeling machinecarried on choose a type, thus completed a 110 kV electricity apart of design.

本文首先根据任务书上所给系统与线路及所有负荷的参数，分析负荷发展趋势。从负荷增长方面阐明了建站的必要性，然后通过对拟建变电站的概括以及出线方向来考虑，并通过对负荷资料的分析，安全，经济及可靠性方面考虑，确定了110kV ，35kV ，10kV 以及站用电的主接线，然后又通过负荷计算及供电范围确定了主变压器台数，容量及型号，同时也确定了站用变压器的容量及型号，最后，根据最大持续工作电流及短路计算的计算结果，对高压熔断器，隔离开关，母线，绝缘子和穿墙套管，电压互感器，电流互感器进行了选型，然后进行配电装置和平面布置的设计以及防雷的设计，从而完成了110kV 电气一次部分的设计。

The absorption and distribution of chromium were studied in ryeusing nutrient culture technique and pot experiment.

采用不同浓度K2CrO4(0，0.4，0.8和1.2 mmol/L)的Hoagland营养液处理黑麦幼苗，测定铬在黑麦体内的亚细胞分布、铬化学形态及不同部位的积累。

By analyzing theory foundation of mathematical morphology in the digital image processing, researching morphology arithmetic of the binary Image, discussing two basic forms for the least structure element: dilation and erosion.

通过分析数学形态学在图像中的理论基础，研究二值图像的形态分析算法，探讨最小结构元素的两种基本形态：膨胀和腐蚀；分析了数学形态学复杂算法的基本原理，把数学形态学的部分并行处理理念引入到家实际应用中。