A three phase switchgear or control gear includes: at least one compartment; a plurality of components for a first phase; a plurality of components for a second phase; and a plurality of components for a third phase. The plurality of components for the first phase, the second phase, and the third phase each include a connection to a main busbar, a circuit breaker actuator, a single phase circuit breaker pole, and a cable connection. The circuit breaker actuator and the single phase circuit breaker pole for the first phase are oriented along a first axis. The circuit breaker actuator and the single phase circuit breaker pole for the second phase are oriented along a second axis. The circuit breaker actuator and the single phase circuit breaker pole for the third phase are oriented along a third axis. The first axis, the second axis, and the third axis are inclined.

A switchgear or control gear includes at least one first compartment; a plurality of removable modules; a plurality of main switchgear or control gear components; and a plurality of auxiliary switchgear or control gear components. The plurality of main switchgear or control gear components includes at least one main busbar system, at least one three position linear or rotational movement disconnector, at least one circuit breaker, and at least one cable connection. The plurality of auxiliary switchgear or control gear components includes at least one disconnector drive and at least one circuit breaker drive. The plurality of removable modules are configured to be mounted horizontally within the at least one first compartment at a plurality of horizontal locations. Movement of a removable module from its horizontal location, the movement including a vertical movement, is configured to move the one or more auxiliary components housed in or associated with that module.

A DC breakers and in particular to DC breaker modules suitable for use in a high voltage DC circuit. The breaker module comprises at least a first breaker circuit (enclosed within a conductive enclosure. The enclosure is configured such that the first breaker circuit can be connected (in an electrical path with a circuit external to the conductive enclosure. The conductive enclosure is further configured to be connected to a node of the electrical path such that, in use, the conductive enclosure is at the same voltage potential as the node of the circuit path. The conductive enclosure may be a standardised size and may, for example, be a standard shipping container. The methods and apparatus of the present application allow a DC breaker to be formed from modules that can be built, tested, transported and installed in a standardised enclosure.

A metal-clad compliant grounding/earthing switch device configured for use within conventional switchgear is described. The device is equipped with adequate and compliant insulation of all bus connections, and is configured to close during maintenance outages grounding the live parts of the circuit feed by a particular breaker. The device enables electricians to perform maintenance and repairs in the event of an outage safely, and without the need to manually install a temporary Ground-and-Test Device. An insulated clam shell is present to limit fault propagation from live components until components are confirmed as grounded prior to maintenance of the switchgear.

A metal-clad compliant grounding/earthing switch device configured for use within conventional switchgear is described. The device is equipped with adequate and compliant insulation of all bus connections, and is configured to close during maintenance outages grounding the live parts of the circuit feed by a particular breaker. The device enables electricians to perform maintenance and repairs in the event of an outage safely, and without the need to manually install a temporary Ground-and-Test Device. An insulated clam shell is present to limit fault propagation from live components until components are confirmed as grounded prior to maintenance of the switchgear.

An electrical enclosure where all functional compartments are accessible only from a front and the enclosure has a width that is no greater than twenty-four inches. Plenum chambers provide an exit path from releasing gas pressure and particulate matter generated during an arc flash event within the enclosure and prevent the gases and particulate matter from entering the other compartments. A vacuum circuit breaker compartment may include insulator bushings and current transformers that are each individually removable from a front of the enclosure. A removably connected roof panel permits selective front accessibility to the bus bar compartment through the plenum chamber and a flap movably connected to the bus bar compartment. A wall of the cable connection compartment includes an opening and a portion of a wall of the voltage transformer compartment is removably connected to facilitate access to the cable connection compartment from a front of the enclosure. An interlock assembly is selectively configurable to facilitate control over movement of the voltage transformer and the door by disconnected, test and service configurations.

An electrical enclosure where all functional compartments are accessible only from a front and the enclosure has a width that is no greater than twenty-four inches. Plenum chambers provide an exit path from releasing gas pressure and particulate matter generated during an arc flash event within the enclosure and prevent the gases and particulate matter from entering the other compartments. A vacuum circuit breaker compartment may include insulator bushings and current transformers that are each individually removable from a front of the enclosure. A removably connected roof panel permits selective front accessibility to the bus bar compartment through the plenum chamber and a flap movably connected to the bus bar compartment. A wall of the cable connection compartment includes an opening and a portion of a wall of the voltage transformer compartment is removably connected to facilitate access to the cable connection compartment from a front of the enclosure. An interlock assembly is selectively configurable to facilitate control over movement of the voltage transformer and the door by disconnected, test and service configurations.

An interlock device of a ring main unit configured to be attached to an inner frame of the ring main unit controls an attachment and detachment of a cable cover using a spring, thereby including an effect of facilitating the attachment and detachment of the cable cover through an elastic force of the spring.

A Branch busbar device for high voltage arrangements, whereby the branch busbar device comprises a first electric line with a first electric contact area and a second electric line with a second electric contact area, whereby the first electric contact area is connected to the second electric contact area, whereby a first field limiting part is arranged at a first place adjacent to the contact areas, a second field limiting part is arranged at a second place adjacent to the contact areas, and the first field limiting part and the second field limiting part are electrically connected to the first electric line or to the second electric line or to a third electric line of the branch busbar device is provided.

A compartment for a medium voltage air or gas insulated switchgear includes: a plurality of walls. At least one wall of the plurality of walls is an external wall. The external wall is a first metal sheet. The external wall includes a plurality of conductive elements. A first surface of the first metal sheet is an outer surface for thermal contact with ambient air. A second surface of the first metal sheet is an inner surface for thermal contact with air or gas within the compartment. The plurality of conductive elements extend from the second surface of the first metal sheet into the compartment.