US 12,451,275 B2
Gas insulated surge arrester and a gas insulated surge arrester monitoring system
James Taylor, Ludvika (SE)
Assigned to Hitachi Energy Ltd, Zürich (CH)
Appl. No. 18/022,238
Filed by Hitachi Energy Ltd, Zürich (CH)
PCT Filed Aug. 25, 2020, PCT No. PCT/EP2020/073730
§ 371(c)(1), (2) Date Feb. 20, 2023,
PCT Pub. No. WO2022/042826, PCT Pub. Date Mar. 3, 2022.
Prior Publication US 2023/0326632 A1, Oct. 12, 2023
Int. Cl. H01C 1/026 (2006.01); H01C 7/12 (2006.01)
CPC H01C 1/026 (2013.01) [H01C 7/126 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A gas insulated surge arrester comprising a metal clad housing within which a block stack is arranged, the block stack comprising at least one metal-oxide resistor column, the gas insulated surge arrester characterized by:
a capacitive element arranged to obtain an electric field measurement of the gas insulated surge arrester, wherein the capacitive element is arranged to extract a capacitive third-order harmonic component in a leakage current of the surge arrester, and
a bushing arranged through the metal clad housing and arranged to provide a capacitive third-order harmonic current measurement to an input of a surge arrester monitoring device.