国产高压变频器在锅炉引风机上的应用

本文通过某热电厂锅炉引风机的变频调速改造的实例，阐述变频调速节能的原理，分析变频改造的经济效益，探讨国产高压变频器在锅炉风机上的应用。     

高压变频器在攀钢提钒炼钢厂中的应用

本文综述了高压变频器的性能特点及系统原理，从节能、高效、环保等方面分析了高压变频器在攀钢提钒炼俐厂中大惯量高压除尘风机的应用，取得了良好的经济效益和社会效益。     

高压变频协调控制技术在变频应用系统中的研究

通过对一种新型的高压变频应用技术的原理、结构说明,着重阐述高压变频协调控制技术在高压变频应用系统中的安全性、稳定性、经济性等方面的保障作用。为高压变频提供一种全新的应用方式及系统改造手段和模式。     

高压变频器在铁合金电炉除尘风机上的应用

本文介绍了风光牌高压变频器在铁合金冶炼电炉除尘风机上的应用,分析了高压变频器的工作原理与性能特点,并结合在除尘风机上的应用.说明高压变频器应用于铁合金冶炼企业所带来的对能源的节约及产生的经济效益。     

高压变频器在常减压装置上的应用

本文介绍了变频调速的基本原理和变频系统的控制原理,利用变频调速器控制电机和机泵的转速,用转速调节法调节控制流量,实现降低电能损耗,降低系统故障率,提高系统控制水平,达到提高企业经济效益的目的。增强了装置的抗干扰能力,改善了原控制系统的控制质量,提高了生产的平稳性,具有良好的应用效果。     

1号火法配电站改造工程设计施工综述

根据生产需要优选高压开关柜选型及继电保护方式选择 ,优化施工组织 ,实现安全高效优质安装     

500KV高压开关瞬态电阻测量系统

本文提出的高压开关瞬态电阻测量系统 ,属测量原理的可行性设计与试验 ,基本解决了根据开关运行状态决定是否解体检修的难题。为实现大型设备状态检修积累了一定的数据和经验     

Prediction of the failure probability of the overhead power line exposed to large-scale jet fires induced by high-pressure gas leakage

A thermal failure model (TFM) is proposed to predict the failure probability of Aluminum Conductor Steel-Reinforced (ACSR) typed power line close to a large-scale jet fire of leaked high-pressure gases. It introduces a newly developed method for heat transfer from jet fires and a distribution model for conductor failure probability via IEEE Standard 738–2012. Comparisons covering van der Waals equation, jet flame length correlations (Chamberlain, Schefer, Molkov and Bradley) and thermal radiation models (point source, multi-point source and line source) were made to illustrate priority with respect to experimental measurement of large hydrogen and natural gas jet fires. Results show that a theoretical framework incorporating van der Waals equation, Molkov's correlation for jet flame length, radiative fraction model and point source model is adequately precise to predict high-pressure leakage process, total flame length and received radiant heat flux (far-field). Predicted total flame lengths of a large jet fire for nearby power lines within 50–200 m to the accident site correspond well to reported results and the conservative hazard ranges are predicted based on harm criteria of wood and Probit equations. In simulations, an acceptable safety distance for power line carrying 907 A and below is determined to be 150 m.     

高品质超高层酒店供配电系统比较探讨

阐述在高品质超高层酒店设计实践中供配电系统的重要作用,对一些可能会被忽视的因素,做了较为独到的分析和论述.     

HVDC transmission system using multilevel power converters based on dual three-phase two-level inverters

Multilevel converters are now an attractive solution for high-voltage direct-current (HVDC) electrical energy transmission systems. Unlike the well-known two-level voltage source converters, multilevel converters use 3 or more voltage levels or steps per leg to modulate the ac voltages, decreasing voltage distortion and reducing electromagnetic interference. This work presents a HVDC transmission system based on a new multilevel structure using a dual two-level converter topology. This structure attains multilevel operation and advantages using two well known three-phase voltage source two-level inverters connected to one three-phase open windings transformer. The proposed dual converter structure has two independent dc links allowing each inverter to process half of the total power. This arrangement is fitted with a control system designed to control the active and reactive power towards their specific set point values, while balancing the voltages of the two dc link capacitors in real time. Obtained results show the effectiveness of the proposed HVDC transmission system.