Short circuit ratio

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Short circuit ratio (or SCR) has multiple meanings:

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<span class="mw-page-title-main">Dynamic braking</span> Dynamic braking is the use of the traction motors as generators when slowing a vehicle.

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<span class="mw-page-title-main">Voltage regulator</span> System designed to maintain a constant voltage

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This glossary of electrical and electronics engineering is a list of definitions of terms and concepts related specifically to electrical engineering and electronics engineering. For terms related to engineering in general, see Glossary of engineering.

In an electrical grid, the short circuit ratio is the ratio of the short circuit apparent power (SCMVA) in the case of a line-line-line-ground (3LG) fault at the location in the grid where some generator is connected to the power rating of the generator itself (GMW). Since the power that can be delivered by the grid varies by location, frequently a location is indicated, for example, at the point of interconnection (POI):

In an electromechanical generator, the short circuit ratio is the ratio of field current required to produce rated armature voltage at the open circuit to the field current required to produce the rated armature current at short circuit.