Annual report 1948 Conference on Electrical Insulation (1949) / Chapter Skim
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Pages 28-30
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From page 28... ...
- 28 The results-of t h i s studjr Dead to the condlusion i h a t "dry" spots can be expected to appear i n high-pressure, g a s - f i l l e d dabi^ i/hfen the gas pressiire i s suddenly released, but that apparently these have no harmful eiffect under service conditions. Although these experimental res^olts show no harmftil effects ,even for repeated sudden pressure releases, such severity of conditions i s not necessary and should be avoided f o r commercial i n s t a l l a t i o n s .
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From page 29... ...
- 29 ( f ) M etallic shielding braid i s cemented over the styrenated paper i n s i i l a t i o n and an annular space between the shielding braid and a brass sleeve i s f i l l e d under low pressure with synthetic rubber similar to that desci-ibed i n (b)
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From page 30... ...
- 30 Table 1 Summary of Tests on Plsstic Stop Joints Test Niimber Size of cable, Mem 600 Thickness of j o i n t i n sulation over connector, mils 720 Kinds of styrenated tapes Thickness, mils 3 and 5 Treatment a f t e r styrenation None Treatment of pencil None Heat treatment None Load cycles during pressure t e s t None Power f a c t o r at room temperature and 25 kv to groimd Not tested Rate of gas leak of/hr, 200 psi d i f f e r e n t i a l pressure Location of leak Impulse strength Location of f a i l u r e Behavior on 14.0 kv to ground, 100-hr t e s t Ionization voltage a f t e r 100-hr 12 660 kv Pencil of j o i n t Not tested 600 720 3 and 5 None Adhesive 95 C, 19 hr *
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