Stress Control Systems E n e r g y D i v i s i o n 1 72kV Termination design

Stress Control Systems E n e r g y D i v i s i o n 2 Equipotential-Lines in Joints 100% 0%

Stress Control Systems E n e r g y D i v i s i o n 3 The Alternative for the Future derived from Raychem’s experience in varistor technology Non-Linear Stress Control based on Zinc-oxid powder embedded in polymer matrix

Stress Control Systems E n e r g y D i v i s i o n 4 Unigrade - ZnO Stress Control ZnO powder Calcined Powder Embedding in polymer matrix Extrusion or molding Application by heat or pressure

Stress Control Systems E n e r g y D i v i s i o n 5 ZnO - Model Equivalent Circuit R VAR1 C1C1 R VAR2 C2C2 R VARn CnCn ZnO PE ZnO Voltage

Stress Control Systems E n e r g y D i v i s i o n 6 ZnO Characteristic Polymer matrix doped with ZnO powder Extreme non-linear stress control characteristic Switching point can be adapted as needed Excellent electrical performance, especially BIL

Stress Control Systems E n e r g y D i v i s i o n 7 Field distribution: 12kVph/earth 9,6kV/cm

Stress Control Systems E n e r g y D i v i s i o n 8 Field distribution: AC withstand voltage 57kVph/earth 12kV/cm

Stress Control Systems E n e r g y D i v i s i o n 9 Field distribution: BIL 150kV ph/earth 12,6kV/cm

Stress Control Systems E n e r g y D i v i s i o n 10 Example: Co-extruded tubing Compact, slim and short Positioning insensitive Universal for all voltages Melts during installation, conforms to surface irregularities and seals Achieves BIL of more than 180kV for 24kV terminations

Stress Control Systems E n e r g y D i v i s i o n 11 Example: Patch, Mastic Conforms to insulation by pressure or heat Allows wide tolerances for thicknesses and overlap Simple installation and universal application Easy to adapt to variety of dimensions

Stress Control Systems E n e r g y D i v i s i o n 12 Sealant Tape Screen Cut Filler Insolating Tubing Stress Control and Sealant Layer Sealant Tape Termination Body Stress Control Patch Sealant Tape Leakage Current Collector TFT - DesignIXSU-F - Design

Stress Control Systems E n e r g y D i v i s i o n 13 UniGrade - Universal Stress Control for the Future l Well defined electrical characteristics l Very high impulse withstand l Ceramic, inert material l Properties defined by particles, less sensitive to mixing l Less complex and less costly manufacturing process l Universal application: Voltage, cable, surfaces l Versatile delivery form: Coating, co-extrusion, patch, molded part

Stress Control Systems E n e r g y D i v i s i o n 14 Summary Stress control systems based on materials technology have excellent properties –High BIL performance –High AC withstand performance Compact design –Integrated in Polymers und Elastomers –Reduced dimensions