Design and Testing of 15kV to 35kV Porcelain Terminations Using New Connection Techniques

New techniques for conductor connection in underground cable terminations were investigated in a design of a new distribution class porcelain cable termination. Connections to the conductor were accomplished using set screws, building upon previous designs with additions to assure a conservative design approach. The connector design was tested according to applicable standards for load cycling of connections, and the result appears capable of conservative performance in the operating environment. Use of such screw connections in distribution primary circuits has been very limited. They are not suitable for insulated splices because of the bulk and sharp edges found in this type of connection. Use in terminations has also been limited and compression connectors usage is commonplace. The compression connector is not without its problems as stated earlier and includes the problem of selecting the proper die, maintaining the equipment in proper condition to give full pressure, bringing the equipment from ground to bucket during riser pole installation and in manipulating the large heavy compression head during installation. With these drawbacks in mind a termination design using set screw connectors conservatively designed to reduce field problems and make reliable connections was investigated.