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Seismic Testing

IEEE 693 is the governing standard for seismic testing of substation equipment for IEEE C62.11 and IEC 60099-4 surge arresters. The IEEE 693 standard details test procedures for seismically validating a wide range of products including arresters, switches, bushings, and a multitude of other equipment. Hubbell Power Systems qualifies the seismic capability of its surge arresters to Annex K of IEEE 693. All VL and PVI-LP arresters under 35 kV rated voltage are seismically qualified by inherently acceptable criteria. All other Hubbell Power Systems arresters are qualified by shake table testing. To be qualified, a surge arrester must survive the shake table test with no structural damage and remain functional, as dem onstrated by successfully passing routine production tests after shake table testing. IEEE 693 allows seismic qualification based on the concept of “qualifying equipment by group”. This concept permits products of different voltage ratings, but similar physical structure, to be combined into groups for qualification purposes, with the most seismically vulnerable piece of equipment of each group being analyzed or tested. All arresters which do not exceed the listed height, mass and center of gravity for these arresters is also qualified to IEEE 693.

Page 64 | October 2023