Results of outdoor ageing of cast epoxide systems under electrical stress

Abstract

APPENDIX 7Cost Details Axial Lead Mylar GP Capacitor--'t!OW liquid cast a. Material Insert -15 mm. long -7 mm. diameter Mould-20 mm. long Cavity-9 mm. diameter Volume of Epoxy = L, (r,) -L2 (r:} = 20 (4.5 2 ) -15 (3.5 2 ) = 695 m" = .695 cc Weight of Epoxy = .695 X 1.83 (sp gr) = 1.27 grams Add scrap loss for sprue, runners and gates for average 50 cavity mould 1.27 plus 30% ~measured) = 1.65 gr Costof Epoxy 1.65 grams $ 5 lb $0 0047 . 450 X 1.2 per = . per capacitor b. Labour Estimated usage of this type and size= 8000/week = 400,000/year approx.As there are a total of six sizes, it is important to get maximum machine utilization (and minimum cost per unit) by moulding a large number of units per cycle.Use 100 cavity mould, with a 2.5 minute moulding cycle (2 min transfer and cure plus allowance for removal and insertion of loading jib) . 60 ~ 100 X $450 per hour = .00275 per unit. $2 .50 per ho ur plus 80% overhead. TOT AL COST (without depreciation) of encapsulation ... $0.007 /capacitor Depreciation (suggested method) Charge transfer press cost over 5 years, and over total number of capacitors to be moulded in the 5 years.Charge mould over 3 years, over number of capacitors of that size to be moulded.