A series of scaled low-voltage side surge current tests were conducted on a model distribution system. The tests revealed the most significant circuit parameters effecting the magnitude and distribution of currents that will flow in a customers wiring.The tests also showed that distribution transformers utilizing interlaced windings rated 240/120 volts are unlikely to significantly increase the magnitude of surges in comparison to noninterlaced windings of the same rating.
The Task Force was formed in response to a proposal that a secondary, or low-side, current surge withstanddesign test be included in the IEEE test standards. It was charged with reviewing all information on low-side surges and determining if revisions of dielectric tests of distribution transformers are indeed warranted. Althoughagreement on astandard test has not
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