Abstract
One piece, pre-molded joints have been used all over the world for high voltage (HV) XLPE cables, For those pre-molded joints, ethylene-propylene rubber has mainly been applied for many years.
We have succeeded to apply a new cold-shrink technology on those pre-molded joints with silicone rubber which has lower elasticity, better mechanical properties, such as lower permanent set. With cold-shrink technology, pre-molded sleeves can be shipped expanded onto the carrier pipes. So the customer needs no tools for assembly on the jointing site and just needs to pull out the carrier pipes.
All the type tests required on IEC standards 60840 were carried out including water immersion and heating cycle tests on our newly developed 110-138 kV cold-shrinkable joints (CSJ) and have shown good performance in all the tests, which means we became the first manufacturer all over the world who developed cold-shrinkable joints (CSJ) with silicone rubber for HV XLPE cables.
