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LIGHTNING EFFECTS ON COMMUNICATION SYSTEMS
POWER INTERFERENCE Under Abnormal Conditions
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alternating currents amperes approximately areas Bell Canada Bell System body breakdown buried cable cable sheath cathodic cathodic protection coaxial communication components conductor corrosion coupling Dalziel damage decay devices dielectric dielectric strength direct current discharge distance duration earth potential effects electric shock electrode engineering equipment equivalent exposure factors fault current fibrillation field flashover frequency GROUND MAT grounding structure Hydro Quebec impulse induced voltage insulation interference ionization L/G faults levels lightning strokes magnetic storms magnitude maximum measurements metal microseconds miles obtained occur ohms ohms-metre Ontario Hydro open wire operation parameters percent phase potential gradients Pourbaix diagram power line power system produce protection protectors range reactance Reference relatively relays sequence impedance shield shock hazard shown in Figure skywires soil resistivity station stray current subtransmission surge current telephone plant transmission typical ventricular fibrillation voltage class volts wave waveshape zero sequence