To provide results of high quality, the operation of astronomical observatories faces multiple dilemmas: Observations need to be precise, hence requiring for both stable measurement conditions and long measurement durations while external disturbance needs to be kept at minimum level. Astronomical observatories are typically set up at remote locations. The electric grid which is required to operate the observatory contains power electronics to a high degree, e.g. for acquisition, storage and transport of measurement data. This distorts sinusoidal current and voltage signals within the whole installation. The sensitivity of measurement electronics relies on voltage and current signals not to be distorted above a certain extent so that the instruments may differentiate weak measurement signals from signal noise. This contribution assesses the state of health of the electrical power grid and points to effects on the operation of astronomical observatories supplied by the grid.
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