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Surge-seal Protector
End Users: Surge-seal™ Protector Electrical Utilities, Pipeline Operators
Applications:
Advantages:All traveling wave surges caused by lightning, switching operations or faults are reflected or refracted due to the change in surge impedance at isolating fittings and other ungrounded terminals. This phenomenon develops hazardous transient over voltages. Surge-seal™ Protectors are specifically designed to utilize the non-linear characteristics of metal oxide ceramics to limit the structure to ground potential to within 50% of the withstand voltage of electrical insulators. Surge-seal™
Protectors are used for:
1. Mitigation of hazardous transient voltages across: cable sheath joint insulators, pipeline plastic jackets, sheath jacket insulations, sheath sectionalizing insulators.
2. Mitigation of circulating currents and induced voltages on electrically isolated pipelines, cables, and other structures exposed to electrical surges.
3. Cross-bonding of single conductor, self-contained cable systems; this is accomplished with regained confidence, due to the superior protection of Surge-seal™ between each cable cross-bonding lead and ground. The useful life of self-contained cable systems is greatly extended.
4. Prevention of damage to flange-type insulators, that isolate pipe-type power cables from SF6 compressed'gas insulation (CGI) systems, at terminal stations, in the event of a fault on the CGI system.
Advantages:
Safety The potential dangers of open sparking and shattering are avoided by the superior solid state construction and the modest energy absorption requirements of Surge-SeaI™.
Versatility Surge-Seal™ can be designed to suit the specific electrical requirements of most applications.
Flexibility The protector can be safely buried, installed in a pit, or above ground.
Credibility "The transient behaviour of a cross-bonded 230 kV cable circuit and a 115 kV cable circuit was investigated with the Electro-Magnetic Transients Program (EMTP) and good agreement with field test data was obtained".
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