Self-supporting and dry insulated – the new DOC termination
Pfisterer is expanding its range of terminations with DOC, the first dry and self-supporting outdoor cable termination up to 170 kV.
Image source: Pfisterer
Germany, Winterbach: Pfisterer is expanding its range of terminations with DOC, the first dry and self-supporting outdoor cable termination up to 170 kV.
Completely preassembled and fully routine tested, it cuts installation time from hours to minutes. Energie Steiermark in Austria is already using this maintenance-free, environmentally and operationally safe solution.
Solid-insulated and lighter than conventional oil or gas-filled terminations, dry outdoor cable terminations have been used worldwide for decades. The silicone solid insulation ensures environmental and operational safety as well as durability in use in substations and on overhead power lines, with no risk of leakage. The first self-supporting, dry and compact version up to 170 kV is reliable and maintenance-free in long-term use, and it connects cable systems to overhead lines and busbars.
“The one-piece, self-supporting design reduces the number of components and facilitates installation at the place of use. The DOC central unit, comprising a hollow insulator, stress grading device and base plate, is delivered to the site fully preassembled and routine tested,” explains Tarek Fahmy, Senior Product Manager at Pfisterer. Testing under IEC 60840 section 9 is carried out on the whole central unit, instead of (as is usual) only on the stress grading device. DOC also meets all criteria of the highest pollution class according to IEC 60815-3. It is therefore suitable for areas with high levels of dust, even deserts.
Fitted in minutes, the modular design of the DOC simplifies handling across the board during transportation and installation. Thanks to the silicone solid insulation, no filling is required on site. The conductor is connected quickly and securely using SICON screw technology, without any hydraulic pressing tools. With FrontCon, the company offers a sophisticated connection solution even for single-wire insulated conductors.
Source: Pfisterer