Technical terms about composite insulators

Technical terms about composite insulators include ANSI, boron-free e-glass, combined load charts, corona, dry band arcing, e-glass, flashover, IEC, leakage distance, RCL, RIV, RTV, RTL, section length, SCL, SML, and strike distance.

composite insulator

Technical terms about composite insulators:
ANSI: The American National Standards Institute verifies that the standard developers are complying with the consensus and all other approval criteria.
Boron-free E-Glass: Electrical grade fiberglass that has corrosion resistance greater than boron containing E-glass; it is environmentally friendly due to the lack of boron and fluorine.
Combined load charts: Also referred to as application curves; a graphical representation that shows how the maximum working loads interact for a given line post or braced line post assembly.
Corona: A luminous discharge resulting from ionization of the air surrounding a conductor around which a voltage gradient exceeding a certain critical value exists.
Dry Band Arcing: Electrical flashes that occur between wet and dry spots over the contaminated surface of an insulator.
E-Glass: Electrical grade fiberglass; the first glass used for high-voltage insulators.
Flashover: A disruptive discharge that is capable of breaking the insulation level provided by the air around the insulator, which creates an arc between parts of different potential or polarity.
IEC: The International Electrotechnical Commission develops and publishes international standards for all electrical technologies.
Leakage Distance: The distance between the conductive end fittings of the insulator across the insulator surface, moving in and out of the sheds; also commonly referred to as the creep or creepage distance.
RCL: Reference Cantilever Load is the maximum design cantilever load (MDCL), which is rated at 50 percent of the part’s SCL.
RIV: Radio-Interference Voltages are caused by electric currents that produce magnetic and electrostatic fields that are capable of inducing high-frequency voltage pulses in nearby radio antennas. The RIV of an insulator is measured under conditions specified by industry standards.
RTV: Room Temperature Vulcanate (elastomer sealant) is a silicone rubber that cures at room temperature.
RTL: Routine Test Load is the maximum design tension load, which is rated at 50 percent of the part’s SML. All parts are tested at this rating prior to being shipped.
Section length: The straight-line distance between the coupling points of the insulator’s end fittings.
SCL: Specified Cantilever Load is the minimum ultimate cantilever strength of the part.
SML: Specified Mechanical Load is the minimum ultimate tensile strength of the part.
Strike Distance: The shortest distance across the insulator surface, between the end fittings of the insulator; also commonly referred to as the dry arc distance or tight string distance.


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