强迫润滑拉拔时压力管中润滑剂的压力

由压力管与工作模同心轴排列成模芯,在拉拔时,由于流体(润滑剂)动力作用,运动的钢丝不断地将润滑剂带入,在压力管与工作模相邻附近的口腔内形成高压区,因而实现强迫润滑拉拔。它比一般润滑拉拔具有很多优点。高压区润滑剂压力很高,是一般高压泵难以达到的。本文通过实验测定及理论分析证实高压区的形成,存在及其压力值的大小,并指出影响其压力值的有关参数。     

On-Line Partial Discharge Monitoring and Diagnostic System for Power Transformer

This paper introduces a computerized on-line partial discharge （PD） monitoring and diagnostic system for transformers. The system, which is already in use in a power station, uses wide-band active transducers and a data acquisition unit with modularized and exchangeable components. The system software is a power equipment monitoring and diagnostic system, which is based on the component object model, and was developed for monitoring multiple parameters in multiple power supply systems. The statistical characteristics of PDs in power transformers were studied using 7 experimental models for simulating PDs in transformers and 3 models for simulating interfering discharges in air. The discharge features were analyzed using a 3-D pattern chart with a three-layer back-propagation artificial neural network used to recognize the patterns. The results show that PDs in air and oil can be distinguished. The model can be used for interference rejection on-line monitoring of partial discharge in transformers.     

利用非线性绝缘子以降低电力系统绝缘水平的研究之一 非线性绝缘子对输电线路操作过电压的影响的研究

随着现代材料科学的发展,非线性绝缘材料将被广泛地应用于电力系统。本文通过计算机辅助分析研究非线性绝缘子对输电线路操作过电压的影响以及非线性绝缘子的参数和配置问题。文中第一部份为数学模型,第二部份为初步研究结果。以后将继续研究对大气过电压及系统绝缘水平与配合的影响。研究结果表明,非线性绝缘子能够有效地限制系统过电压及缩短暂态时间,从而能够降低系统的绝缘水平。     

电力电容器的可靠性评估和失效分析

研究了在 １９８０～１９８９年间按装并运行于某配电系统的 ８ ７３６台高压电力电容器。分析了５４１台失效电容器。在建立电力电容器失效的数学模型基础上，计算了它的故障率和可靠性水平。对电力电容器的失效机理和失效原因讨论表明，局部放电特性仍是电力电容器失效的关键。从而提出对电力系统和制造厂均有用的某些结论。