Operation and maintenance of an electric power transmission grid is complex. Unlike the natural gas transmission, the electric system must be instantly responsive to changes in demand and generation. Most commonly used calculations involve the calculation of kVA (or MVA), kVAR (or MVAR), maximum allowable current (AMPS), kWh, water storage in acre feet (AF), or calculating equivalent tap settings in regulators of different percentage design.
Tips on matching voltage regulation per regulator or load tap changer (LTC) step: Count the total steps, excluding neutral, then divide that into the total percentage regulation (example, +/- 10%, +16/-16= 20% divided by 32= 0.625% per step. Another example: +/- 7.5%, 33 step, 1-33 with 17 neutral= 15% divided by 32= 0.469% per tap. Use caution in matching percentage taps, for parallel. Consider: phase angle shift across banks, unregulated source kV, ratio, impedance or no load tap differences, connection and ratio of metering potential, and other special conditions.
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