Heat Shrink Terminations | Tracking on Medium Voltage Cable Terminations

Published 01 Nov 2021

By Stephen Harrison | Training & Technical Manager Current Training Service Pty Ltd

Terminations for MV Power Cables

The image shows a shed (rain shed) – this is a heat shrink moulded part and component of standard medium voltage cable terminations. The installed rain shed is in operation on a 33kV indoor installation – tracking and discharging can be seen on the outside of the shed (rain shed) element of the cable termination and if left unchecked this will eventually cause the MV cable to fail in the field. At 33kV (Um 36kV) this cable termination was suffering a tough time whilst in service and it was eventually pulled out of operation after the discharge was identified. The discharge and tracking can be seen between the surface of the anti-tracking tube and the shed (rain shed) collar which is due to poor installation by the cable jointer. Sheds (rain sheds) must be shrunk down with collar connecting to the anti-tracking tubes evenly. If in doubt how and where the shed (rain shed) is to be installed, refer to manufacturer’s instructions.

Thorne & Derrick | Distributors of Medium Voltage Joints, Terminations & Connectors

3M Electrical | Nexans Euromold | Pfisterer CONNEX | Main UK Stockists