A high voltage gas insulated switchgear, HV GIS, includes a plurality of disconnector modules associated to each phase and filled with an insulating gas, each including a disconnector for connecting a feeder connection to a main bus bar, the disconnector modules interconnected with the main bus bar associated to each phase and extending through all disconnector modules, and a plurality of auxiliary modules associated to each phase, filled with the insulating gas and interconnected with an auxiliary bus bar configured for increasing a current carrying capability of the HV GIS and associated to each phase and extending through all auxiliary modules, at least two of the disconnector modules and auxiliary modules of the respective phase including a coupling connection connecting the main bus bar and the auxiliary bus bar between the respective disconnector module and the respective auxiliary module.

The disclosure relates to an adaptation module configured for connecting three conductors of two modules and/or bays of a three-phase encapsulated gas-insulated switchgear, including two opposite arranged insulators each including three radially spaced conductor connection inlets and configured for electrically connecting the conductor connection inlets to one of the two modules and/or bays, and three concentrically arranged axially extending conductors each connected to two opposite conductor connection inlets, spaced from each other and rotatable in respect to the axis.

A power source emulator is provided for testing programmable switchgear that switches to an alternative three-phase power source upon sensing a failure of a grid source. The emulator provides three simulated three-phase power sources for testing switchgear. Each source is identical in voltage and phase to the current normally distributed by the switchgear but has less than 1% of the amperage. Each power source includes a single three-phase contactor for simultaneously controlling all three phases of the power source, and three solid-state relays for controlling each of the three phases of the power source. A control circuit controls the three-phase contactor and each of the three solid state relays of each power source to simulate various types of power failures that the switchgear is programmed to respond to.

A current transformer arrangement for a gas-insulated switchgear is provided. The current transformer arrangement includes an adapter having a housing, the housing defining a first end connection opening, a second end connection opening and a hollow interior, a current conductor passing through the hollow interior of the adapter, and an annular current transformer core surrounding an exterior of the housing for measuring a current of the current conductor.