SnO2-based varistors capable of withstanding surge current

Current State of Surge Testing Induction Machines

Surge testing of motor coils has been an industry practice since J. L. Rylander published “A High Frequency Voltage Test for Insulation of Rotating Electrical Apparatus” in Transactions of the AIEE, in February of 1926. Since that time the use of surge testing to diagnose failing or damaged insulation in motors has advanced greatly. In 1926, the indication of a turn-turn insulation failure was ...

Withstanding Multimillion-Node Botnets

Colin Dixon is a graduate student at the University of Washington. While an undergraduate at the University of Maryland he worked on approximation algorithms and anonymous communication. His current research interests include computer security, network architecture, and distributed systems with a focus on deployable solutions for real-world problems. of Washington. He is an ACM Fellow and a win...

Quality assessment of ZnO-based varistors by 1/f noise

Noise has been used as a diagnostic tool of surge arrester varistor structures comprising of ZnO grains of various type and size. The physical and electrical properties of the measured samples have been described. In the experimental study, the applied measurement system and the results of noise measurements for the selected structures of varistors designed for the continuous working voltage 28...

Manufacturing of zinc oxide varistors

Leakage Current Analysis of Polymer and Porcelain Housed Metal Oxide Surge Arresters in Humid Ambient Conditions

This paper aims to measure and analyze of the leakage current of 20 kV polymer and porcelain metal oxide surge arresters under humid ambient conditions by applying different voltages to the arresters terminal. The characteristics of the leakage currents at that stage have been investigated when changes in the ambient humidity were introduced in an artificial fog chamber. It is assumed that magn...