Switchgear load sharing for oil field equipment

A hydraulic fracturing system for fracturing a subterranean formation comprising:

• a plurality of electric pumps fluidly connected to a well associated with the subterranean formation and powered by at least one electric motor, and configured to pump fluid into a wellbore associated with the well at a high pressure so that the fluid passes from the wellbore into the subterranean formation and fractures the subterranean formation;
• at least one turbine generator electrically coupled to the plurality of electric pumps so as to generate electricity for use by the plurality of electric pumps;
• at least two switchgear units electrically coupled to the at least one turbine generator and configured to distribute an electrical load between the plurality of electric pumps and the at least one turbine generator;
• a tie breaker electrically coupled between each of the at least two switchgear units and configured to evenly distribute the electrical load between the plurality of electric pumps and the at least one turbine generator when the tie breaker is in a closed position;
• and
• a variable frequency drive connected to the at least one electric motor to control the speed of the at least one electric motor, wherein the variable frequency drive frequently performs electric motor diagnostics to prevent damage to the at least one electric motor.