CPC H02J 3/0075 (2020.01) [H02J 3/0073 (2020.01); H02J 3/02 (2013.01); H02J 3/003 (2020.01)] | 20 Claims |
1. A grid power system for distribution of electrical power for hydraulic fracturing at a well site, comprising:
a main breaker coupled to an electrical power source, wherein the main breaker is a mobile unit mounted on a trailer or skid, wherein the main breaker includes a current monitoring system which monitors current at one or more output lines of the main breaker, wherein the main breaker is opened when the current at the one or more output lines equals or exceeds a preset current threshold;
a transformer coupled to one of the one or more of the output lines of the main breaker, wherein the transformer provides a plurality of secondary outputs that are phase shifted relative to each other; and
two or more electric pumping units coupled to the transformer, wherein the transformer transforms a line voltage received from the main breaker into a different voltage level for output to the two or more electric pumping units, wherein a first secondary output of the transformer is coupled to a first one of the two or more electric pumping units, wherein a second secondary output of the transformer is coupled to a second one of the two or more electric pumping units, and wherein the second secondary output of the transformer is phase shifted relative to the first secondary output of the transformer.
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