MVN Arrester

Key parameters affecting the seismic capability of arresters are the grade of porcelain used, the thickness of the housing walls and the overall mass and center of gravity of the arrester. The MVN arrester supersedes the original VN arrester with 40% stronger casting, a redesigned base and reduced overall height, making it the arrester of choice for high seismic regions.

AVR 245kV Switch

The USCO® AVR 230kV 3000Amp Vertical Break Switch meets the IEEE 693 standards for high seismic qualifications. During testing, this switch operated flawlessly even after two rounds of open blade testing - which appears to be a first for group operated switches. Its robust construction, coupled with simple design concepts, provide ease of operation in even the most stressful environments. The AVR group operated air break switch carries a 10 year warranty the longest in the industry and is an appropriate, cost effective choice for substations that reside in a seismic prone region.

PCORE® Bushings

PCORE adheres to the rigorous testing standards and strives to provide the most comprehensive selection of 15kV through 500kV porcelain bushings available to address the electric industry's seismic needs. PCORE offers a wide range of products, including 15kV-69kV PRC® bushings, 25kV-500kV POC® bushings and cost saving products such SET-Terminals, Bushing Repair and the patented Quick-Link bushing.

With regards to seismic capabilities, PCORE 15kV to 69kV bushings are qualified by the static pull test and 115kV to 500kV bushings are qualified to the highest performance level by the time history shake-table test. PCORE's new 500kV-1675kV BIL bushing recently passed the test where the bushing was shaken at an acceleration of 2.5g (25% higher than the required value for high seismic performance) and the top of the bushing experienced an acceleration of more than 8.0g.

The PCORE SET-Terminal has a rated static cantilever strength of up to 2500 ft-lbs, more than 300% higher than existing models and can absorb high shock loading in excess of 500g's with side blades in the open position.