| 摘要 |
A joint for a paper-insulated lead covered cable (PILC) including paper insulation impregnated with oil, the joint comprising a first PILC 6 and an outer retaining jacket 8 having a hollow interior, the first PILC having an inner conducting element that is conductively secured to an inner conducting element of a further cable within the hollow interior of the outer retaining sleeve 8, the joint further comprising a sealant 16 forming a sealant layer within the hollow interior of the retaining jacket and a retaining structure 24 positioned within the sealant layer. The sealant retaining structure 24 is preferably non-porous and non-fibrous and may be an O-ring, mesh or grid. The sealant may be a mastic tape and the retaining structure forms a barrier preventing propagation of voids within the sealing mastic which may occur due to an increase in pressure within the joint during use. The sealant barrier mesh 24 thus prevents leakage of oil from paper insulation which may otherwise leak from voids within the sealing mastic 16. The outer retaining jacket may be an elastomeric tube, heat shrink tube, or formed from tape. The sealant retainer 24 may also be located at a part of a PILC not necessarily forming a joint. |
