Abstract
Extra high voltage (EHV) transmission systems (i.e., power transmission voltages between 365 and 1000 kV) are designed to operate at the system baseband frequency (i.e., 50 or 60 Hz). However, pulse width modulated (PWM) electronically switched components in the system itself and at loads may result in high frequency spectral components of voltages. These spectral components are not harmonics of the baseband frequency. This paper discusses the source of these high frequencies and quantifies the voltages and frequencies encountered. The focus of this paper is on EHV transmission systems. Actual field measurements made at a 500 kV substation are shown and analyzed. The general range of frequencies of these voltages is 2.5 to 75 kHz. The impact of high frequency voltages is discussed.
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