Abstract
Long-distance transmission of electrical power through extra-high voltage overhead lines and power distribution through cable system call for controllable reactive-power compensating circuits on an increasing scale. The transmission losses are thereby reduced, voltage deviations kept within permissible limits and the system stability is improved The achievements in the field of thyristor techniques made it possible to build steplessly controllable compensating reactors which are combined with a three-phase thyristor power controller. Selection of optimum voltages, current and reactor reactance of the static compensator is dealt with and the current and voltage ratings of the thyristors are explained. The problem of harmonics, the influence of unbalanced conditions, and the protective and monitoring arrangements are also referred to.
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