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GCB underground substation servi os

Electromagnetic Spectrum Caused by Partial Discharge in ... measured noise spectrum in air at three different types of high voltage substations; 550kV open-air insulation substation, 550kV open-air GIS substation and 275kV underground GIS substation. A biconical antenna acting in a frequency range from 30 to 300 MHz was placed at a few meter away from GIS or gas circuit breaker (GCB) in the substations.

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