A Three Phase Common Enclosure Type Gas Insulated Surge Arrester For Protection Of Electrical Substations From Over Voltages

Abstract: The invention relates to a three phase common enclosure type gas insulated surge arrester for protection of electrical substations from lightning, switching and temporary over voltages, comprising ; a plurality of metal oxide (MO) elements stacked in series to form a stack assembly, and connected by a corresponding number of inter-stage elements each having multiple flow channels including inner passages, the profile of the interstage elements being constructed to reduce an overall electrical stress level, maintain an uniform electrostatic field across the MO elements and eliminate ionization of the insulating medium at the edges of the MO elements; an insulating housing filled with an insulating gas and having a current transfer plate including a current transfer cum spring holder plate, accommodating the stack assembly (SA); a high tension (HT) shield improving the non-linear voltage distribution across the stack assembly by compensating the capacitive coupling between the SA blocks and a grounded enclosure; a metallic support plate allows mounting of the SA of all the three phases and integrates the stack assembly with the grounded enclosure via an insulating plate; an insulated low tension (LT) terminal assembly provided on the low-voltage side of the ouster which being brought-out via a LT-support insulator, the LT terminal having a plug-socket type arrangement to detachably attach with the surge arrester; wherein the grounded enclosure comprising a reducer assembly connected to the other modules of GIS, a straight chamber supporting the insulated tube assemblies including the LT assembly, and a dish cover assembly allowing side-fixing of the insulting plate, and wherein the high voltage side of the arrester connectable to add-on. MO elements by a profiled conductor through a support insulator.

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