Features of construction of manipulators for electron-beam welding installations

The features of the construction of multicoordinate manipulators for moving welded products in precision electron-beam welding installations are considered. The kinematic circuits of manipulators, the types of stepping motors, and the circuit of the control system over the multicoordinate moving of welded products are presented.     

Complex design of electrical equipment for precision electron-beam welding

Results of analysis of electrical characteristics for precision electron-beam welding equipment in accordance with modern technological requirements are presented. A complex method of designing systems of this class that takes into account the relationship of characteristics of the elements and modes of operation and provides the composition and parameters of the equipment with their adjustment in the design process is proposed.     

真空电子束焊接在氢镍电池中的应用

空间用高压氢镍电池为全密封电池,壳体密封性是决定电池性能的重要因素,氢镍电池采用真空电子束焊接技术,各条焊缝的质量决定了电池的可靠性和安全性。介绍了真空电子束焊接原理、氢镍电池壳体电子束焊接及其焊缝质量的验证,通过焊接试件检验、电池组在轨运行情况说明了真空电子束焊接在高压氢镍电池中的成功应用。     

Modern principles for construction of power sources for electron-beam welding units

Modern requirements for power sources of welding electron guns are formulated. The electron-gun parameters are analyzed as the power source load, and main trends in electrical equipment for electron-beam welding are revealed. The modern principles for construction of power sources for electron-beam welding units are considered using the example of two schematic diagrams.     

Analyzing the dynamic characteristics of the beam-deflection channel in an electron-beam unit

The design principle of a system for magnetic-beam-deflection control in an electron-beam unit is analyzed. The frequency characteristics of the magnetic-beam-deflection channel in an electron-beam unit are calculated based on a computer model constructed using the Matlab/Simulink software package.     

Current trends in development of electric equipment for electron-beam precision welding and dimensional machining

The article discusses the major trends in the development of power-supply sources for electronbeam industrial installations applied for precision welding and dimensional machining. Technical specifications are given, as well as general circuit approaches to the power-supply sources of triode thermionic electron-beam guns.     

Dynamic processes in abnormal operating conditions of power supplies of welding electron-beam guns

The dynamic processes in power supplies of welding electron guns caused by abrupt change in the parameters of load, currents, and voltages have been considered. A mathematical model for the study of abnormal modes of power supplies that are part of the power unit of an electron-beam welding installation with regard to the mutual influence of their parameters has been proposed. Results of experimental studies of the operation of an inverter prototype have been compared with the simulation results.     

新型发电机-变压器组微机监录与分析系统的研究

新型发电机 -变压器组微机监录与分析系统集运行状态监测、实验数据记录与分析以及故障数据记录与分析等功能于一体 ,以适应电厂状态检测和故障分析与诊断的需要。介绍了该系统的主要功能、硬件结构和软件设计特点     

新型发电机-变压器组微机监录与分析系统的研究

新型发电机-变压器组微机监录与分析系统集运行状态监测、实验数据记录与分析以及故障数据记录与分析等功能于一体,以适应电厂状态检测和故障分析与诊断的需要。介绍了该系统的主要功能、硬件结构和软件设计特点。     

Development of a full-scale training simulator for an 800-MW power unit

Stages of work involving preparation of requirements specification, development, and subsequent implementation of a project for constructing a full-scale training simulator of an 800-MW power unit are considered. The training simulator is constructed using the Kosmotronika-Venets computerized automation system developed by PIK Progress (Moscow). The entire personnel training system, the arrangement of drills, and the concept of structuring the entire personnel education system at the Surgut GRES-2 district power station, a branch of E.ON Rossiya, had to be touched in drawing up the requirements specification for elaborating the training simulator. The article describes how these problems were solved.     

Development of a thermal scheme for a cogeneration combined-cycle unit with an SVBR-100 reactor

At present, the prospects for development of district heating that can increase the effectiveness of nuclear power stations (NPS), cut down their payback period, and improve protection of the environment against harmful emissions are being examined in the nuclear power industry of Russia. It is noted that the efficiency of nuclear cogeneration power stations (NCPS) is drastically affected by the expenses for heat networks and heat losses during transportation of a heat carrier through them, since NPSs are usually located far away from urban area boundaries as required for radiation safety of the population. The prospects for using cogeneration power units with small or medium power reactors at NPSs, including combined-cycle units and their performance indices, are described. The developed thermal scheme of a cogeneration combined-cycle unit (CCU) with an SBVR-100 nuclear reactor (NCCU) is presented. This NCCU should use a GE 6FA gasturbine unit (GTU) and a steam-turbine unit (STU) with a two-stage district heating plant. Saturated steam from the nuclear reactor is superheated in a heat-recovery steam generator (HRSG) to 560–580°C so that a separator–superheater can be excluded from the thermal cycle of the turbine unit. In addition, supplemental fuel firing in HRSG is examined. NCCU effectiveness indices are given as a function of the ambient air temperature. Results of calculations of the thermal cycle performance under condensing operating conditions indicate that the gross electric efficiency η _{el NCCU} ^gr of = 48% and N _{el NCCU} ^gr = 345 MW can be achieved. This efficiency is at maximum for NCCU with an SVBR-100 reactor. The conclusion is made that the cost of NCCU installed kW should be estimated, and the issue associated with NCCUs siting with reference to urban area boundaries must be solved.     

An ultrahigh-voltage controllable power source based on an electron-beam valve

The construction feasibility of a modular ultrahigh-voltage power source with a voltage of 2.5 million V on the basis of EBV 2/200 electron-beam valves possessing a pentode volt-ampere characteristic a the voltage of up to 250 kV, is considered. The valve allows smooth control of the source high voltage values of every module up to 250 kV and maximal load breakdown current up to 1 A.     

SA335P91钢焊接工艺在330MW机组上的应用

阐述了江苏南通天生港电厂2台330 MW机组主蒸汽管道、高温再热蒸汽管道(热段)的管道尺寸规格和材质,对SA335P91钢的焊接特性进行了分析,制定了焊前准备、焊接工艺和焊后热处理工艺方案.实践证明,该焊接工艺是可行的,满足DL/T869-2004要求,能够保证焊接质量.     

超（超）临界机组焊接工程质量控制与管理

介绍了超（超）临界机组在安装阶段的焊接质量控制所面临的形势与任务,分析了焊接质量、工期和安全之间的关系,对焊接工程上遇到的大量实际问题进行分析和总结,提出了一套切实可行的管理模式,建议发放“焊接团证”,以便更有效地保证超（超）临界机组焊接施工质量。     

发变组监录与分析系统的开发

介绍了发电机变压器组（以下简称发变组）监录与分析系统所采用的数据记录方式，分析软件的重要功能和设计特点，数据采用一种瞬时值记录和实虚部记录相结合的数据记录格式，数据文件以二进制形式保存，不仅提高了记录信息的完整性，而且减少了记录数值量，有利于数据存在和通信传输。分析软件功能丰富，适应性强，操作使用方便，除提供了常规分析功能外，特别针对发变组提供了功角分析，机端阻抗分析，差流分析，过激磁分析等功能。     

基于80C196KC微处理机的同步电机智能化转速继电器

分析了同步电机转速信号装置的发展现状 ,介绍了智能化转速继电器的工作原理 ,软硬件结构以及抗干扰措施。现场应用实践表明 ,该转速继电器具有测速精度高 ,测速范围宽 ,操作简单 ,可靠性高 ,与上位机通信方便等优点 ,具有推广应用价值     

基于80C196KC微处理机的同步电机智能化转速继电器

分析了同步电机转速信号装置的发展现状,介绍了智能化转速继电器的工作原理,软硬件结构以及抗干扰措施.现场应用实践表明,该转速继电器具有测速精度高,测速范围宽,操作简单,可靠性高,与上位机通信方便等优点,具有推广应用价值.     

电力暂态信号数据采集与录波单元的研制

设计和开发了一种基于TMS320F2812数字信号处理器的电力暂态信号的高速数据采集与录波单元.该数据采集与录波单元通过高速数据采集可实时地测量三相电压、电流、功率、功率因数、谐波等基本电参数;也可实时监测电力系统状况,当系统发生故障时,能可靠地记录故障暂态波形.系统硬件主要由TMS320F2812数字信号处理器、复杂可编程逻辑器件(CPLD)、AD采样保持器、通用串行总线USB2.0接口等组成,给出了硬件结构图;系统软件分为采集卡程序和主机的USB驱动程序,给出了软件流程图.说明了采集卡的主要功能.试验结果表明所设计的单元能满足电力系统高频暂态数据的采集与录波.     

加强经费单位基建财务管理的思考

企业实行新会计准则以来,基建财务与企业财务接轨过程中,面临管理弱化、不规范和不能适应改革的情况,有待革新与加强。经费单位应从财务管理的各个层面加强和完善基建投资财务管理,以利于节约建设 资金、控制建设成本、提高投资效益。     

高精度动力电池组电压采集单元的设计

通过完善现有的串联电池组单体电压测量电路,开发了一种动力电池组电压采集单元,解决了电池管理系统中电压采集模块硬件电路复杂,成本高和测量精度低的问题.开发的采集单元采用光电继电器切换巡检的方式,后级精密电阻分压,高精度片外AD转换,转换结果经单片机处理后通过485数据总线发送给电池管理系统主控单元.电池组放电试验结果表明...