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Royal Switchgear - Seismic Letter of Notice, May 4th, 2015

To our valued customers:

This letter is to advise that Royal Switchgear has tested and passed IEEE 693 HIGH shaker-table testing for its vertical break switch

Some exciting facts from testing:

  • The tested switch was a 230kV 3000A switch with 1050kV BIL insulators and grounding switch. TR-312 insulators were used to create a "worst case scenario" for testing.
  • By testing the "worst case" at 230kV, this enables Royal to be qualified in essentially every 230kV and 161kV seismic zone scenario.
  • This is the first shaker-table test ever performed using the 230kV PG&E vertical break support structure.
  • Royal can, if required, supply the switch and structure that were seismically qualified together.
  • The test was conducted at the University of Buffalo lab in New York with the supervision of W.E. Gundy & Associates, Inc. (WEGAI).
  • WEGAI is internationally known for exceptional analysis with focus in seismic qualification and design of electrical substation transmission and distribution equipment and building electrical-mechanical test equipment.
  • This is the tallest structure WEGAI has ever seen used for a 230kV shaker-table test.
  • Photo of the test is on the following page.

Please let us know if you have any questions or comments! Thank you!