The new Siemens silicone long rod insulators type 3FL combine the highest levels of electrical insulation and mechanical tensile strength with a compact, lightweight design. Thanks to their superior design and reduced weight, 3FL long rod insulators are especially suitable for overhead compact-line applications where low tower design and short line spans are required. Furthermore, they can also be transported and installed more economically.
According to long-established Siemens tradition and making use of the experience of producing high-voltage equipement for more than a century, each production step for the 3FL - beginning with numerous incoming raw material inspections through the assembly of the individual components to routine tests of the finished products - is rigorously monitored and well controlled.
Standards and tests
All 3FL long rod insulators are designed and tested in compliance with the latest standards IEC 61109, IEC 62217, IEC 60815, and IEC 61466-2. All design and type tests have been successfully performed.
Each Siemens 3FL insulator that leaves the factory is routinely tested with a corresponding mechanical tensile test load of at least 50 percent of the defined SML load for at least ten seconds.