This is the author's final draft of the paper presented at the 14th International Symposium on High Voltage Engineering, August 25-29, 2005, Tsinghua University, Beijing, Paper H-25. Details of the 2009 Symposium on High Voltage Engineering can be found at http://www.ish2009.org/Effects of cross-linking by-products\ud (residues) of polyethylene on space charge\ud accumulation and decay are investigated in the paper using the pulsed electro-acoustic technique. Space charge profiles have shown a great variation both in the charge initiation over the voltage ramping up process and later on long term stressing and decay (volts off) among the samples subjected to different conditioning,\ud which results in diverse residues content (fresh, 0.5% residue and thoroughly degassed). The results show that\ud by-products of cross-linking or the residual impurities play a key role in the space charge accumulation in cross-linked polyethylene. On the removal of impurities\ud by degassing, small homocharge was built up in the vicinity of the electrode. It is concluded that space charge accumulation is governed by the charge injection through dielectric/electrode interface when sample is\ud thoroughly degassed
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