September 5, 2013 – Alstom Grid says it has successfully tested 820kV bushings for HVDC (high-voltage direct current) converter transformers, placing it as one of only three players in the world to manufacture this technology.

Bushings allow high-voltage conductors to pass through earthed walls of transformers, switchgear and substation structures; DC bushings must be based on solutions that minimize the risk of oil spill inside the valve room to meet fire prevention regulations in HVDC converter plants. Alstom’s 820kV/4500A transformer and wall bushings have now been fully type-tested in accordance with international standards, including temperature rise tests.

“This success strengthens Alstom’s leadership in HVDC technology worldwide, following other recent announcements such as the testing of our ultra-HVDC wall bushings and our high-voltage DC breaker,” boasted Lars Martinsson, vice-president.