Lightning protection for aged cable systems — Problems with water trees

The injection of a silicone dielectric fluid in to cables to treat the water trees has been practiced for more than 25 years. Lightning protection combined with silicone fluid injection is a unique way to protect critical aged circuits. These circuits are more susceptible to damage as the water trees decrease the impulse strength of the cable. The review of cable rejuvenation and the factors necessary for protecting aged cables will be discussed.