PEXLINK - Transmission Line Arrester

Improvement in the reliability and availability of a transmission system can be obtained in one or more of the following ways:

• Duplication of the system (more than one line)
  This is a very expensive method and often impractical
• Increased insulation withstand
  It can be both expensive and create other problems such as the need for increased insulation of station equipment.
• Improved footing impedance
  Often difficult and expensive, specially in hilly terrain.
• Shield wires
  If the provision was not in the original tower design, it can be expensive to retrofit such shielding. It helps eliminate a large number of interruptions but it is not enough to obtain the now-demanded degree of reliability
• Protection with surge arresters
  Protection of line insulation by surge arresters connected in parallel with them at selected towers. In this application usually the term line arresters is used.