Abstract
Existing MV/LV substations have been designed according to the applicable standards of the past. Since then, however, standards on internal arc resistance of substations have become stricter and safety awareness among grid operators has also increased. The replacement of electrical components in existing MV/LV substations, particularly exchanging the MV switchgear, can be a natural opportunity to assess and, if needed, upgrade the substation's internal arc resistance. In an attempt to avoid the assessment of each substation individually, this study investigates in general the need to upgrade internal arc resistance of MV/LV substations, based on worst-case situations. It appeared that in all considered cases a simple and affordable pressure relief hatch can solve any overpressure problems. Therefore, in case of replacement of the MV switchgear, this hatch can now be applied as a standard to ensure the internal arc resistance of the substation.
Published Version
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