立式水轮发电机推力轴承高压油顶起装置

介绍了立式水轮发电机推力轴承高压油顶起装置的结构及各主要部件的功能.介绍了高压油顶起装置的远方自动启动及现场手动方式、自动及手动退出运行方式,高压油顶起装置的控制逻辑.介绍了响水涧电站发电机高压油顶起装置在调试及试运行过程中出现的几种故障情况及其解决办法,可供其他电站在设计、安装、调试高压油顶起装置时作为参考.     

响水涧推力轴承高压油顶起装置设计

立式水轮发电机组的高压油顶起装置,其作用是当机组启动和停机的低速适转过程中,向推力瓦表面和镜板之间注入高压油,建立承载油膜,减少干摩擦,从而保障推力轴承的安全运行。通过介绍高压油顶起装置的系统结构和润滑计算,给出了响水涧电站机组推力轴承高压油顶起装置的计算数据,并结合响水涧电站4台机组的启动和运行情况正常,证明了高压油顶起装置设计的合理性。     

灯炮贯流式机组自动开机不成功原因及对策

介绍了某电厂贯流式机组自动开机不成功的事故,从事故电磁阀和高压油顶起装置2方面分析了机组自动开机不成功的原因,针对事故电磁阀和高压油顶起装置故障的原因,提出了针对性的应对策略,提高了贯流式机组自动开机的成功率。     

贯流式水轮机组高压油顶起装置的故障分析

介绍了一起贯流式水轮机组高压油顶起装置不能正确投入的故障,分析了故障发生的原因,并从修改控制流程、更换压力变送器、改进高压油顶起管路3方面提出了改进措施,以避免同类故障的发生。     

双油室高压油顶起装置的改进与计算

提出了高压油顶起装置的一种改进,即高压油通过一个孔注入推力瓦面上的两个油室内,同时推导了相应的计算方法。     

高压油顶轴装置在重型车床上的应用

高压油顶轴装置利用外界压力油注入车床主轴承的静压油腔中，将主轴顶起，使其在重载起动时为液体摩擦，以减少轴瓦的磨损，降低起动力矩，延长轴承使用寿命。本文介绍静压油腔的设计和计算方法。     

新论灯泡贯流机组油系统

本文通过分析灯泡贯流机组润滑油系统、调速操作油系统及高压油顶起系统的机械液压设计、自动控制设计以及车间和现场调试,提出了一些在贯流机组润滑系统及其控制系统的配置、设计、调试时应考虑的参数及须注意的问题.     

核主泵推力轴承自润滑摩擦副研究

本文介绍了一种适用于核主泵油润滑推力轴承的自润滑摩擦副,由碳纤维增强复合材料和硬质合金构成。对摩擦副材料进行了摩擦磨损和机械性能试验研究,研究显示摩擦副具有较低的摩擦系数和比磨损率,可承受高温和高剂量辐照。开展新摩擦副的高载荷推力轴承台架试验,试验结果显示自润滑摩擦副在无高压油顶起和无冷油循环时具有较好的耐磨性。新方案可以降低轴封式核主泵全厂断电工况下主推力瓦磨损和一回路系统压力低工况下副推力瓦磨损,降低启停时高压油顶起系统对交流电源依赖,提高设备可靠性。     

丹江口4号机150MW水轮发电机推力轴承高压油顶起、水冷瓦运行总结

本文对在丹江口水电站4号机上做的高压油顶起和水冷瓦试验进行了较详细的说明。证明文中推荐的试验装置是可行的。对今后的有关设计和运行提供了实践经验。     

水电机组用新型制动器开发成功

水电机组用制动器和油压顶起装置的传统结构都是采用只有一个活塞的缸体 ,并用 3路活门向缸体内既通气又通油的结构。实践表明 ,这种结构常使活塞的动作失效 ,从而影响水电机组的紧急刹车和油压顶起装置的可靠性。哈尔滨电机厂有限责任公司最近研制成功一种新型制动器 ,它采用油、气各自独立的双管路和双活塞结构 ,其 2个活塞可以组合在一起 ,但却互不干扰。气活塞位于缸体上部 ,油活塞则在缸体的下部 ,即油活塞只在下部运动。这种使气活塞和油活塞在缸体内运动分成两段的新结构 ,能保证油和气在缸体内不混合 ,防止油、气杂质的产生 ,从而保…     

基于激光传感器的智能车路径识别系统设计

实现了一种自主式循迹智能车路径识别系统,设计了基于激光传感器的路径识别系统的硬件和控制算法,提高了光电式智能车的前瞻和抗干扰能力。实践表明,具有较高的稳定性和准确性,可使智能车以2.7m/s的平均速度稳定运行,已在竞赛中取得了良好的成绩。     

Prevention of reignition overvoltages by phase-angle-controlled switching of a gas circuit breaker at shunt reactor current interruption

Shunt reactors installed at gas-insulated switchgear substations (GIS-substations) are switched relatively frequently by large-capacity gas circuit breakers (GCBs). Surge voltages appear at such switching operations through various mechanisms. Among them, high-frequency current interruption and subsequent multiple reignition might cause the highest overvoltage and may be harmful to the insulation of the components of the substation. In this paper, shunt reactor current-interrupting tests are conducted in high-power laboratory. The existence of critical arcing time above which reignitions never occur is shown through these tests. From this fact, a phase-angle-controlled-interruption system is proposed. With this system, arcing time is set artificially so that reignitions should be prevented. The reliability of this system is confirmed through the reactor current-interrupting test in the laboratory as well. Afterward the phase-angle-controlled-interruption system is applied to the shunt reactor switching at an actual 275-kV substation. The switching performance of this system is measured over three months. Reignition-free interruption is shown to be attained with this system.     

Equivalent model of the side wall electrodynamic suspension system

The side wall electrodynamic suspension (EDS) system has the advantage of not requiring gap control, and the magnetic drag is smaller than for the repulsion arrangement. This levitation system is applied in the JR magnetically levitated (Maglev) transportation system. The experimental results in the Miyazaki test line seem to indicate that this system has large damping. However, calculations show that this system has little damping and the reason for large damping in the test line is not clear. Thus, running characteristics and improved design can be investigated using numerical analysis to improve riding comfort and reduce loss of the superconducting magnet. Since this is a non-linear system, complicated analysis is needed. Usually the running characteristics of this EDS system are given by a numerical analysis that combines electromagnetic phenomena with mechanical equations of motion. However, this method requires very large calculation times. Thus, a simpler suspension model for this EDS system is needed. This paper presents levitation and guidance characteristics of the system and develops an equivalent suspension system model from the electric circuit characteristics. The approximation is developed by a simple function of the velocity and position of the bogie. The dynamic movement of the bogie was calculated easily using this model, and the results correspond to the results given by the electric circuit model. © 1998 Scripta Technica, Electr Eng Jpn, 124(2): 63–73, 1998     

基于DSP的焊枪摆动电机控制研究

介绍一种基于DSP的焊枪摆动控制系统,描述该系统的组成、结构及特点,深入阐述了PWM控制原理及其在步进电机和交流伺服电机中的控制方法,并给出控制系统的硬件电路和软件流程,实验结果表明该系统能够完全实现设计要求.     

变电站综合自动化系统在泸天化的应用

概述了变电站综合自动化系统,简要介绍了该系统在四川泸天化股份有限公司部分变电所中的应用情况,已有三个变电所先后成功投入运行。     

基于MSP430单片机的电压波动和闪变检测系统设计

对IEC提出的电压闪变测量模型进行分析,给出了电压闪变的数字化测量方法,设计了各单元模块的数字滤波器,并对Pst的统计算法的设计采用了平均值插值法。该系统硬件的实现主要采用TI公司的MSP430单片机,而软件部分主要是基于MSP430单片机的C语言程序,包括系统的初始化、采样频率的设置、各数字滤波器的C语言实现。尤其对35 Hz低通滤波器的设计采用了加海明窗的FIR滤波器方法,保证了系统运算的相位线性化。该系统通过实验验证,证明了其可行性。     

基于USB接口的集成数字温度检测仪设计

温度检测是控制系统中常见的监测参数,本设计将USB接口应用于温度检测系统,把采集到的温度数据实时传送到计算机中.文中介绍了基于USB接口的温度检测系统的工作原理,详细叙述了该系统的硬件结构和软件设计.该系统工作稳定可靠,设计思路可扩展到多种应用场合.     

An expert system for voltage and reactive power control of a powersystem

A methodology called the sensitivity tree, which can be easily used to form an expert system for real-time control, is proposed. Based on this methodology, an expert system for the control of voltage and reactive power of a power system is developed. The main objective of this expert system is to help the operator detect buses experiencing abnormal conditions, select the most effective control measures, and calculate the control actions required to overcome the voltage violation. The control measures used to alleviate the voltage problem are capacitor compensation, transformer tap changes, and generator terminal voltage changes. By keeping the bus voltage in the entire system within limits, system security is increased. The expert system is written in the PROLOG language. Simulation studies with this expert system applied to a 30-bus power system show satisfactory results     

广州哈里斯的GRM通信资源管理系统应用

电力通信资源管理系统对电力通信系统提高自身的管理能力和提高企业的竞争力方面具有重要意义。文章简要介绍了电力通信网资源管理系统的实现和应用。根据现状，电力通信资源管理系统宜采用自主开发的矢量图形系统，应具备机房设备资源、线缆走廊资源、光缆资源、电缆资源、传输网资源、接入网资源管理功能。此外，对电力通信资源管理系统实施过程中应注意的问题进行了总结，强调资料的收集和录入是系统建设能否成功的关键所在。     

异步电动机直接转矩控制的开关电压优化

分析了异步电动机直接转机控制系统工作原理,针对异步电动机直接转矩控制系统转矩脉动大的缺点,对异步电动机的定子磁链区间进行改进,并利用Maflab／Simulink软件对异步电动机直接转矩控制系统改进前后进行了建模和仿真。