A . M o n t f o o r t N.V. KEMA L a b o r a t o r i e s E l e c t r i c i t y Board N.V. PNEM U t r e c h t s e w e g 310 W i l l e m s p l e i n 2 6812 AR Arnhem 5201 HA ' s -H e r t o g e n b o s c h THE NETHERLANDS Keywords: water treeing, medium voltage cable, service experience, characterization t e s t , ageing. Abstract -Water treeing problems encountered in The Netherlands in some medium voltage cables prompted t h e authors to develop a test with which t h e degradation of t h e i n s u l a t i o n of extruded cable could be characterized.The test method developed was demonstrated to be effective. It revealed t h a t 20 % of t h e network cables examined were defective and needed replacement.In evaluating t h e results, it was shown t h a t t h e water tree susceptibility of some cables can be correlated to specific manufacturers or unknown parameters in their production process. However, i t was not possible to isolate t h e cause of t h i s susceptibility to any of t h e following parameters alone: crosslinking process, conductor shields or w e t soils. I t was decided to investigate -with t h e t e s t method to be developed-t h e level of degradation of t h e network of the Electricity Board in relation t o different cable properties, such as supplier, construction, ageing time or soil condition. 0885-8977/90/0100-0040W1.00 0 1989 IEEE ~ -
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