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  • An Electrostatic Simulation of a Surge Arrester
    The surge arrester example presented on these pages is based on a document from the International Electrotechnical Commission (IEC) -- "Guide for the determination of voltage distribution along the length of metal-oxide surge arresters". ElecNet simulation results were compared to some results
  • Thermal Characteristics of a 330 KV Surge Arrester
    Surge arresters are used in a number of industries as protective devices against a variety of electrical events such as high voltage lightning impulses. The design choices of various materials and components for lightning arresters may depend on their thermal characteristics among many other
  • Surge Arrester: Minimizing Electric Field Stress in Resistors
    The voltage distribution along the resistors in a surge arrester is uneven due to stray capacitances. It is possible to reduce the maximum electric field stress by a careful choice of position for the grading rings. In this example, OptiNet is used with ElecNet to find where the rings should
  • Aircraft arrester system, Swedish Air Force
    The brake system on each of the energy absorbers consists of two Dellner Brakes type SKD 4x75 hydraulically applied disc brakes working on a 1400 mm (55.1 in) diameter brake disc. The arrester system controls the braking force and brings the aircraft to a smooth stop. The braking force is regulated
  • Monitoring of Surge Arresters through Thermographic Inspection - Case Studies
    In this paper we present evaluation cases of surge arrester operational conditions, through thermographic inspections, criteria applied in the field, and analysis carried out in units removed from operation due to the problems indicated by thermograms. Chesf (Companhia hidroelétrica do São
  • When lightning strikes wind turbines
    blade angle. Franklin-type lightning rods protect WTIs against direct lightning strikes. But complete lightning protection in accordance with IEC 61024-1 only comes through the use of a lightning current arrester. There are special requirements for protecting the power-supply system between
  • The Secrets of Transformer Cooling
    your transformer. Those subsystems are often misunderstood and sometimes overlooked. These subsystems are: 1) load tap changer 2) bushings 3) lightning arresters 4) control cabinet 5) the cooling system. The cooling system consists of radiators, valves, pumps, fans, gauges, and controls. I
  • What If?
    overhead power lines, transformers, substations, switches, connections, arresters, insulators, underground equipment that has surfaced on dip poles, transformers, switching equipment and underground equipment in vaults, which are below ground surface. What if I scanned a connection and saw only what
  • Combing GDTs and MOVs for Surge Protection of AC Power Lines (.pdf)
    for equipment connected to AC power lines.The role of gas discharge tube (GDT) surge arresters specifically designed for AC power line protection will also be discussed. The first step in providing an effective defense against power line transients is to accurately characterize the transients. One good