An electric power distributor comprises a distributor housing, conversion parts which convert electric current from outside of the distributor housing to low-voltage alternating current, a transformer which transforms the low-voltage alternating current from the conversion parts to high-voltage alternating current and a power transmission part which transmits the high-voltage alternating current from the transformer to the outward distributor housing. The distributor housing comprises two conversion parts—and the power transmission part—inside. The transformer is attached to the distributor housing from outside. The transformer and the power transmission part are placed along a predetermined direction in this order, the two conversion parts are placed along a direction approximately orthogonal to the predetermined direction at an opposite side to the transformer with regards to the power transmission part.

A substation for medium or high voltage includes: switchgear or controlgear with unmanned operation and maintenance; an inner room in which the switchgear or controlgear is located, the inner room being hermetically enclosed by an outer housing, the inner room being locked against the outer housing by an inner, automatically operated door; and a robot system, the robot system being implemented such that an acting area of the robot system is extended from the inner room, partly in an area outside the inner room, but within the substation internal space, where spare parts are stored in a spare parts hand over area, for maintenance.

A substation for medium or high voltage includes: switchgear or controlgear with unmanned operation and maintenance; an inner room in which the switchgear or controlgear is located, the inner room being hermetically enclosed by an outer housing, the inner room being locked against the outer housing by an inner, automatically operated door; and a robot system, the robot system being implemented such that an acting area of the robot system is extended from the inner room, partly in an area outside the inner room, but within the substation internal space, where spare parts are stored in a spare parts hand over area, for maintenance.

An electric power substation includes one or more primary relay panels located at a substation site and susceptible to damage caused by radiated or coupled electromagnetic energy, and an electromagnetic pulse mitigation module located at the substation site and comprising a continuous conductive enclosure that is impervious to the radiated or coupled electromagnetic energy. One or more backup relay panels are housed within the electromagnetic pulse mitigation module and capable of assuming operation of the one or more primary relay panels.

An electric power substation includes one or more primary relay panels located at a substation site and susceptible to damage caused by radiated or coupled electromagnetic energy, and an electromagnetic pulse mitigation module located at the substation site and comprising a continuous conductive enclosure that is impervious to the radiated or coupled electromagnetic energy. One or more backup relay panels are housed within the electromagnetic pulse mitigation module and capable of assuming operation of the one or more primary relay panels.

A hydraulic fracturing system for fracturing a subterranean formation includes a primary switchgear arranged on a support structure. The system also includes a secondary switchgear, arranged on the support structure, the secondary switchgear positioned separately from the primary switchgear and within an enclosure, the secondary switchgear receiving an electrical input from the primary switchgear and including an plurality of feed connections for supplying electrical power to a plurality of fracturing equipment.

A hydraulic fracturing system for fracturing a subterranean formation includes a primary switchgear arranged on a support structure. The system also includes a secondary switchgear, arranged on the support structure, the secondary switchgear positioned separately from the primary switchgear and within an enclosure, the secondary switchgear receiving an electrical input from the primary switchgear and including an plurality of feed connections for supplying electrical power to a plurality of fracturing equipment.

A split door submersible housing for an electrical distribution system includes a cabinet body defining an interior region configured to accept a component of the electrical distribution system, and a first door and a second door positioned side by side to cover an open front portion of the cabinet body. The cabinet body includes at least one opening configured to accept an electrode sealed with and electrically isolated from the cabinet body and extending through the cabinet body to establish electrical connection between a corresponding terminal of the component and an electrical distribution network. A gasket system is provided, which comprises a first gasket configured to fit on the first door and a second gasket configured to fit on the second door. The gasket system seals the first door and the second door against each other and against a corresponding surface on the cabinet body, when the first and second doors are closed and locked, so that the housing is water tight.

A split door submersible housing for an electrical distribution system includes a cabinet body defining an interior region configured to accept a component of the electrical distribution system, and a first door and a second door positioned side by side to cover an open front portion of the cabinet body. The cabinet body includes at least one opening configured to accept an electrode sealed with and electrically isolated from the cabinet body and extending through the cabinet body to establish electrical connection between a corresponding terminal of the component and an electrical distribution network. A gasket system is provided, which comprises a first gasket configured to fit on the first door and a second gasket configured to fit on the second door. The gasket system seals the first door and the second door against each other and against a corresponding surface on the cabinet body, when the first and second doors are closed and locked, so that the housing is water tight.

A microgrid system comprising a switchgear trailer comprising a plurality of breakers configured to support generators; at least one breaker configured to support a utility source; at least one breaker configured to output power; wherein the breakers are in a parallel arrangement; a plurality of interchangeable connectors; and a common bus.