FOXBORO P0916AW Thyristor module
At high frequencies, the large conducting surface embedded in or on the floor under the equipment to be grounded, presents a much lower characteristic impedance than a single wire, even if both were improperly terminated because the characteristic impedance is a function of L/C. As the capacitance to earth increases, the impedance decreases. (2) Normally, the capacitance of a metallic sheet to earth is higher than that of wire. If the size of the sheet is increased and allowed to encompass more area, the capacitance increases. Also, the unit length inductance decreases with width, which further decreases Zo.
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