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capacitors for high current, power semiconductor, and dc applications g ge capacitors ge td&is transmission, distribution & industrial systems, fort edward, ny 12828 cpd 513 rev. b 3-00 5k
? 2000 ge company ge capacitors for high-current, power semiconductor, and dc applications capacitors for power electronics require special high-performance designs for the varied applications. this catalog describes capacitors for a number of demanding applications where high currents and/or high voltages are common. given the special nature of these applications, care must be taken to ensure that the capacitors are correctly applied. information is included to help with the more common application conditions. an application data sheet is also provided to enlist the help of ges application engineers. please use this sheet if you need assistance or want to verify your own calculations. table of contents page description application data sheet 2 sheet for submitting data to ge for review descriptive information 3 general information on capacitor construc- tion scr commutation 4 high and very high-current applications, capacitors such as scr commutation, scr and gto snubbers, and high-frequency ac circuits metallized polyester 7 high microfarad per unit volume designs for scr capacitors up to 250 v peak. used in high-frequency chopper circuits snubber capacitors 9 medium current snubber capacitors for power semiconductor circuits application data for scr 11 derating information for current pulsewidth and snubber capacitors and temperature. worked examples for common conditions general purpose dc 13 dc capacitors for voltages up to 2500 v capacitors mounting hardware 15 brackets for mounting capacitors 1
? 2000 ge company capacitor application data sheet to ensure correct selection of a capacitor for your application, please provide the information indicated below. this sheet may be duplicated or additional copies may be obtained from ge. of particular importance are the voltage and current waveforms complete with values of voltage and current over a complete cycle. send this data to your local ge sales office or directly to: general electric company transmission systems 381 broadway fort edward, ny 12828-1000, u.s.a. attn: industrial capacitor sales fax: (518) 746-5524 primary information (essential) company name______________________________tel no. (incl. country & city codes) _______________________ address________________________________________________________fax no. __________________________ person to contact:______________________________________________ 1. application: _______________________________________________________ 2. capacitance:________________________ tolerance:____________________ 3. peak voltage: _____________________rms voltage: ______________________voltage reversal(%)________ 4. peak current: ________________________rms current: ______________________ 5. transient voltage: ________________ duration: ___________freq. of occurence: _______________________ 6. frequency or repetition rate (hz): __________________duty cycle: __________________________________ 7. ambient temperature: ________________max.: _______________min.: ______________ 8. capacitor charge time: ________________discharge time: _____________________ 9. required operating life (hours): _____________________________________________________ 10.waveforms: + voltage 0 time - - - - - + current 0 time - - - - - secondary information (provide as appropriate) 11. physical size limitations: _________________________________________________________________ 12. mounting requirements: __________________________________________________________________ 13. applicable specifications: _________________________________________________________________ 14. type of cooling available: _________________________________________________________________ 15. unusual atmospheric conditions: ___________________________________________________________ 16. other special requirements: ________________________________________________________________ 17. potential usage: ______________________________ 2
? 2000 ge company film/foil electrode construction film/paper foil construction ges foil electrode capacitors are manufactured with sheets of high quality aluminum foil as the electrodes. the dielectric consists of two sheets of polypropylene film. the film is manufactured in ges own capacitor materials operation. it is specially designed with a rough surface to allow full impregna- tion by the dielectric fluid. the aluminum foil elec- trodes extend, one on each end of the capacitor roll, so that a solder connection can be made. depending on the typical current for the type of capacitor, the internal connections from the roll ends to the termi- nals are either braided cables or tin-plated copper straps. this construction provides capacitors that are inherently capable of handling high rms and peak currents. ges film/paper/foil capacitors are manufactured with high grade film and foil, and capacitor grade kraft paper. they are typically high voltage dc rated and are treated with geconol capacitor dielectric fluid. these capacitors are exposed foil construction for use in snubber and or dc filtering applications. dielectric fluids all of ges dielectric fluids are chosen for specific characteristics that match the other components in the capacitor dielectric system and the applications for which the capacitors are intended. each fluid is based on one or two major constituents and blended with proprietary additives for optimum performance. dielectrol vii a benzyl toluene-based fluid, used for film/foil high current products. polypropylene film polypropylene film polypropylene film polypropylene film foil foil polypropylene film paper polypropylene film paper foil foil 3
? 2000 ge company this family of capacitors is designed for high-current applications, such as (1) scr commutation, (2) snubbers for scrs, gtos and other power semiconductors, and (3) for any other circuits where the combination of frequency and voltage results in high rms currents. an application note is provided to assist in the proper use of these devices. it is strongly recom- mended that users refer to ge engineers for assistance if there are any questions as to the correct selection of capacitors. the a97f8600/ a97f8700 series have an all-film dielectric and, due to the much lower dissipation factor, can handle much higher currents than the older film paper designs. advances in capacitor dielectric technology have made paint unnecesary, in most cases. this along with ges commitment to environmental programs has led to the elimination of painted cases in this product line. removal of the paint has minimal affect on the rms current ratings; see the standard ratings charts for proper application. specifications available capacitance range: 1 to 50 f capacitance tolerance: 10% capacitance variation with temperature: 3% from -55 c to +85 c rated voltage: see ratings tables. rating is the maximum peak voltage permissible in either polarity. rated current: see ratings tables. the value given is for derating purposes only. refer to the application note on page 12 to determine the required derating. in no circumstances should the rms current rating of the terminals be exceeded. operating temperature: -40 c to +75 c storage temperature: -55 c to +90 c operating life: 40,000 hours with 95% survival with proper derating dissipation factor: 0.02% maximum case material/finish: oval case & cover: unpainted aluminum rectangular case & cover: unpainted steel terminations/hardware: 1/4 - 20 screw thread studs (60 a rms maximum) 3/8 - 16 screw thread studs (100 a rms maximum) case styles c* and d* have 100-a terminals. nut and washer hardware is supplied in bag dielectric fluid: a97f8600/ a97f8700 series: dielektrol vii internal protection: these capacitors do not contain an internal protection mechanism. the user is responsible for ensuring that the capacitors are correctly applied for safe use. scr commutation capacitors a97f8600 / a97f8700 series 600 to 1500 volts peak 4
? 2000 ge company e c n a t i c a p a c ) f ( # g o l a t a ce s a c e l y t s t h g i e h ) n i ( c t n e r r u c ) a ( k a e p s t l o v 0 0 6 2 5 0 1 0 2 0 3 0 4 0 5 0 7 6 8 f 7 9 a 1 7 6 8 f 7 9 a 2 7 6 8 f 7 9 a 3 7 6 8 f 7 9 a 4 7 6 8 f 7 9 a 5 7 6 8 f 7 9 a 6 7 6 8 f 7 9 a a a c d d g g 8 3 . 2 0 5 . 4 5 2 . 4 5 2 . 5 5 2 . 7 8 1 . 5 5 2 . 6 8 3 6 8 6 3 1 5 3 2 9 3 3 4 1 4 0 1 6 k a e p s t l o v 0 0 8 1 2 5 0 1 0 2 5 2 0 3 7 7 6 8 f 7 9 a 8 7 6 8 f 7 9 a 9 7 6 8 f 7 9 a 0 8 6 8 f 7 9 a 1 8 6 8 f 7 9 a 2 8 6 8 f 7 9 a 3 8 6 8 f 7 9 a a a c c g g g 2 6 . 2 0 5 . 3 8 8 . 3 5 7 . 5 2 6 . 4 2 6 . 5 5 2 . 6 8 2 7 4 2 9 8 5 1 6 7 2 0 4 3 4 9 3 case styles a, c and d scr commutation capacitors (all dimensions in inches) * all units are unpainted case & cover case style g case styles c* and d* case style a b d f a 2.16 1.31 0.81 1.18 c 2.91 1.91 1.38 1.12 d 3.66 1.97 1.38 1.12 c* 2.91 1.91 1.25 0.91 d* 3.66 1.97 1.25 0.91 standard ratings * 5
? 2000 ge company e c n a t i c a p a c ) f ( # g o l a t a c e s a c e l y t s t h g i e h ) n i ( c t n e r r u c ) a ( k a e p s t l o v 0 0 0 1 2 3 5 5 0 1 0 1 4 1 6 8 f 7 9 a 5 1 6 8 f 7 9 a 6 1 6 8 f 7 9 a 7 1 6 8 f 7 9 a 8 1 6 8 f 7 9 a 9 1 6 8 f 7 9 a a c c * c d * d 5 7 . 4 8 8 . 3 5 7 . 4 5 2 . 5 5 2 . 6 5 7 . 6 5 5 1 7 2 0 1 7 0 1 2 8 1 9 8 1 k a e p s t l o v 0 0 5 1 1 2 3 5 5 0 1 0 2 6 8 f 7 9 a 1 2 6 8 f 7 9 a 2 2 6 8 f 7 9 a 3 2 6 8 f 7 9 a 4 2 6 8 f 7 9 a 5 2 6 8 f 7 9 a a c c c * c g 8 8 . 3 8 8 . 3 0 5 . 4 5 2 . 6 5 7 . 6 8 1 . 5 5 3 8 5 6 7 6 1 1 1 2 1 7 0 2 scr commutation capacitors (all dimensions in inches) standard ratings * * all units are unpainted case & cover case styles a, c and d case styles c* and d* case style g case style a b d f a 2.16 1.31 0.81 1.18 c 2.91 1.91 1.38 1.12 d 3.66 1.97 1.38 1.12 c* 2.91 1.91 1.25 0.91 d* 3.66 1.97 1.25 0.91 6
? 2000 ge company 97f7500 series scr commutation capacitors 250 volts peak the 97f7500 series is a special purpose line designed for applications where a large micro-farad value at low voltage is required in a small size. the dielectric system is metallized polyester. typical applications are in scr chopper circuits and low-voltage ac filters. refer to the application note on page 12 for assistance in the correct application of these capacitors. please note that previous offering of these capacitors was with painted cases, to improve heat dissipation. the units will no longer be painted as part of ges committment to environmental programs. please note the change in rms current ratings from previous catalogs. specifications available capacitance range: 25 to 200 f capacitance tolerance: 10% capacitance variation with temperature: 3% from -20 c to +80 c rated voltage: 250 v peak. the rating is the maximum peak voltage permis sible in either polarity. rated current: see ratings tables. the value given is for derating purposes only.refer to the application note on page 12 to determine the required derating. in no circumstances should the rms current rating of the terminals be exceeded. operating temperature: -40 c to +70 c storage temperature: -55 c to +90 c operating life: 40,000 hours with 95% survival with proper derating dissipation factor: 0.6% maximum case material/finish: oval case & cover: aluminum unpainted case and cover terminations: 1/4 - 20 screw thread studs (60 a rms maximum) dielectric fluid: dielektrol vi internal protection: these capacitors do not contain an internal protection mechanism. the user is responsible for ensuring that the capacitors are correctly applied for safe use. 7
? 2000 ge company 97f7500 series scr commutation capacitors (all dimensions in inches) standard ratings e c n a t i c a p a c ) f ( # g o l a t a c e s a c e l y t s t h g i e h ) n i ( c t n e r r u c * * ) a ( k a e p s t l o v 0 5 2 0 5 0 0 1 5 2 1 0 5 1 0 2 5 7 f 7 9 4 1 5 7 f 7 9 3 1 5 7 f 7 9 2 1 5 7 f 7 9 c d d d 2 1 . 3 0 5 . 3 5 2 . 4 5 7 . 4 7 2 5 4 5 5 4 6 * * note all rms current ratings are for unpainted units. case styles a, c and d case style a b d f a 2.16 1.31 0.81 1.18 c 2.91 1.91 1.38 1.12 d 3.66 1.97 1.38 1.12 c* 2.91 1.91 1.25 0.91 d* 3.66 1.97 1.25 0.91 8
? 2000 ge company a28f5000 series snubbers capacitors 1000 and 2000 volts peak/ max dc the a28f5000 series of snubber capacitors are designed for use in power semiconductor circuits to protect the semicon- ductor by limiting the rate of voltage rise. the dielectric system is polypropylene and paper with foil electrodes. the rms currents encountered in these circuits are usually low; how- ever, the peak currents are very high. refer to the application data for correct application of these capacitors. specifications available capacitance range: 0.05 to 2 f capacitance tolerance: 10% capacitance variation with temperature: 3% from -30 c to +80 c rated voltage: see ratings table. the rating is the maximum peak voltage permissible in either polarity. rated current: see ratings tables. the value given is for derating purposes only. refer to the application note on page 12 to determine the required derating. in no circumstances should the 10 amp rms current rating of the eyelet terminals be exceeded. for 1/4-20 threaded terminals, full current less any derating may be applied. operating temperature: -40 c to +70 c storage temperature: -55 c to +90 c operating life: 40,000 hours with 95% survival with proper derating dissipation factor: 0.3% maximum case material/finish: aluminum case with steel cover for eyelet terminal designs; aluminum case with aluminum cover for *threaded terminals. terminations: 0.125-in. solder eyelets (10 amp rms maximum) & 1/4-20 screw thread studs (60 a rms maximum) for threaded terminal designs, nut and washer hardware is supplied in bag dielectric fluid: a28f5500 series dielektrol vii a28f5600 series dielektrol vii internal protection: internal pressure sensitive interrupter for eyelet designs. threaded terminal designs do not contain an internal protection mechanism. the user is responsible for ensuring that the capacitors are correctly applied for safe use 9
? 2000 ge company a28f5000 series snubber capacitors (all dimensions in inches) standard ratings e c n a t i c a p a c ) f ( # g o l a t a c e s a c e l y t s t h g i e h ) n i ( c t n e r r u c ) a ( c d x a m / k a e p s t l o v 0 0 0 1 5 . 0 . 1 0 . 2 2 0 5 5 f 8 2 a 3 0 5 5 f 8 2 a 4 0 5 5 f 8 2 a a a a 2 1 . 2 2 1 . 2 8 8 . 2 6 7 1 1 c d x a m / k a e p s t l o v 0 0 0 2 5 0 . 0 1 . 0 1 . 5 2 . 5 2 . 0 5 . 0 5 . 0 . 1 0 . 1 0 . 2 0 . 2 0 0 6 5 f 8 2 a 1 0 6 5 f 8 2 a 5 1 6 5 f 8 2 a 2 0 6 5 f 8 2 a 5 0 6 5 f 8 2 a 3 0 6 5 f 8 2 a 6 0 6 5 f 8 2 a 4 0 6 5 f 8 2 a 7 0 6 5 f 8 2 a 8 8 6 5 f 8 2 a 8 0 6 5 f 8 2 a a a * a a * a a * a a * a c * c 2 1 . 2 2 1 . 2 2 1 . 2 2 1 . 2 2 1 . 2 8 8 . 2 8 8 . 2 0 5 . 4 0 5 . 4 5 2 . 4 5 2 . 4 2 3 3 4 4 7 7 2 1 2 1 7 1 7 1 * denotes 1/4-20 threaded terminal styles b a e l y t s e s a c 1 3 . 1 6 1 . 2 a 1 9 . 1 1 9 . 2 c 10
? 2000 ge company application data for scr and snubbers capacitors for use with capacitor serie s: a97f8600/ a97f8700 this application note is designed to allow users to select the correct capacitor for two common conditions encountered in power electronic circuits: (a) sinusoidal waveform (b) squarewave. for applications that do not fit into either of these categories, please contact your ge sales representative for assistance. to select the correct capacitor proceed as follows: 1. determine the following: (1) microfarad value required (2) peak voltage (3) rms current (4) current pulsewidth (5) capacitor ambient temperature. 2. select a capacitor with the correct capacitance and a peak voltage equal to or greater than the application voltage. 3. apply the correction factors on the opposite page for current pulsewidth and ambient temperature to the 55 c rms current rating of the selected capacitor. if the corrected rms current value is equal to or greater than the rms current of the application, the capacitor is suitable. if not, a capacitor with a higher current rating must be selected. this can be done by choosing a higher voltage capacitor. note that the all-filma 97f8600 series has the highest current ratings. note: in no case should the actual rms current exceed the limit of the capacitor terminals . example no. 1 capacitance: 10 mf voltage: 200 vac rms 3 khz sinewave ambient temperature: 65 c peak voltage = 200 x ? 2 = 283 volts rms current = 2p x 3000 x 10 x 10 -6 x 200 = 37.7 a current pulsewidth = 166 s the a97f8672 has a current rating of 136 a. applying the correction factors for a 166 ms pulsewidth and a 65 c ambient: rms current rating = 136 x 0.56 x 0.75 = 57.1 a this capacitor is satisfactory. note the terminal limit of 60 amps. example no. 2 capacitance: 5 f voltage: 60 vac rms 16.6 khz sinewave ambient t emperature: 65c peak voltag = 60 ? 2 = 85 v rms current = 2p x 16,600 x 5 x 10 -6 x 60 = 31.3 a current pulsewidth = 3 0 s the a97f8671 is rated 86 amps which becomes 80.6a with the correction factors. this is more than adequate. again, note the 60-a terminal limitation. example no. 3 capacitance: 20 f voltage: 600 vpeak unidirectional squarewave frequency: 200 hz rise time: 60 s fall time: 60 s ambient temperature: 65c peak voltage = 600 v c d v 20 x 10 -6 x 600 i peak = = = 313 a 0.64t 0.64 x 60 x 10 i rms = 313 ? 60 x 10 -6 x 200 = 32.4 a current pulsewidth = 60 ms the a97f8673 has a peak voltage rating of 600 v and a current rating of 235 a. the correction factor for 65c is 0.75, and for a 60 s pulsewidth it is 0.90. thus its current rating in this application is 235 x 0.80 x 0.90 = 158.6 a; adequate for the application. again, note the 60a terminal limitation. -6 11
? 2000 ge company sinewave conditions squarewave conditions i = current (amperes) v = voltage (volts) c = capacitance (farads) f = frequency (hertz) t = current pulsewidth (seconds) t = period (seconds) irms = 2 p p p p p fc vrms = v rms p p p p p c t vpeak = ? 2 v rms ipeak = d v = c d v 0.64t p p p p p c 2t irms = ? 2 [ ipeak ] 2 = ? ft 2 ? ft ipeak correction factor for current pulsewidth correction factor for ambient temperature rms current correction factor ambient temperature- degrees c 12 rms current correction factor
? 2000 ge company general purpose dc capacitors 1500, and 2500 volts peak this line of general purpose dc capacitors is made with film/paper technology for 1500v and 2500v ratings. these capacitors are typically used in dc filters at voltages above those served by electrolytic type construction. specifications available capacitance range: 0.1 to 50 f capacitance tolerance: 26f series: 10% capacitance variation with temperature: 5% from -40 c to +70 c rated voltage: see ratings tables. the rating is the maximum peak dc voltage. ripple voltage: the rms ripple voltage should not exceed the following percentages of the rated voltage for these fre quencies: frequency % of rated voltage 60 hz 30 120 hz 20 400 hz 14 1,000 hz 8 10,000 hz 1 operating temperature: -30 c to +70 c storage temperature: -55 c to +90 c operating life: 60,000 hours with 94% survival with proper derating dissipation factor: 0.3% maximum case material/finish: aluminum case (no paint) terminations: (2) 0.25 x 0.031 inch quick connect blades, and one fork blade per terminal dielectric fluid: dielektrol vii internal protection: pressure sensitive interrupter 13
? 2000 ge company e c n a t i c a p a c ) f ( # g o l a t a c e s a c e l y t s t h g i e h ) n i ( c k a e p s t l o v 0 0 5 1 1 2 4 5 6 8 0 1 0 0 5 7 f 6 2 a 1 0 5 7 f 6 2 a 2 0 5 7 f 6 2 a 3 0 5 7 f 6 2 a 4 0 5 7 f 6 2 a 5 0 5 7 f 6 2 a 6 0 5 7 f 6 2 a a a c c c c d 2 1 . 2 2 1 . 3 2 1 . 3 8 8 . 3 5 2 . 4 5 2 . 5 5 2 . 5 k a e p s t l o v 0 0 5 2 1 . 0 5 2 . 0 5 . 0 0 . 1 0 . 2 0 . 4 5 1 5 7 f 6 2 a 6 1 5 7 f 6 2 a 7 1 5 7 f 6 2 a 6 7 5 7 f 6 2 a 9 1 5 7 f 6 2 a 0 2 5 7 f 6 2 a a a a a a c 2 1 . 2 2 1 . 2 2 1 . 2 2 1 . 3 5 2 . 4 5 2 . 4 general purpose dc capacitors (all dimensions in inches) standard ratings b a e l y t s e s a c 1 3 . 1 6 1 . 2 a 6 5 . 1 9 6 . 2 b 1 9 . 1 1 9 . 2 c 7 9 . 1 6 6 . 3 d 14
? 2000 ge company mounting hardware (all dimensions in inches) footed brackets for oval case styles (2 per capacitor) for the proper bracket, match the capacitor case height to the case height shown next to the bracket part t r a p t e k c a r b e s a c r e b m u n t h g i e h 0 1 2 0 0 0 0 2 9 c 2 0 3 2 1 . 2 0 0 2 0 0 0 0 2 9 c 2 0 3 8 3 . 2 0 0 2 0 0 0 0 2 9 c 2 0 3 2 6 . 2 3 1 1 0 0 0 0 2 9 c 2 0 3 8 8 . 2 9 7 1 0 0 0 0 2 9 c 2 0 3 2 1 . 3 9 1 1 0 0 0 0 2 9 c 2 0 3 0 5 . 3 5 1 1 0 0 0 0 2 9 c 2 0 3 8 8 . 3 2 2 1 0 0 0 0 2 9 c 2 0 3 5 2 . 4 1 1 2 0 0 0 0 2 9 c 2 0 3 0 5 . 4 6 1 1 0 0 0 0 2 9 c 2 0 3 5 7 . 4 3 5 1 0 0 0 0 2 9 c 2 0 3 5 2 . 5 3 3 2 0 0 0 0 2 9 c 2 0 3 0 5 . 5 9 0 2 0 0 0 0 2 9 c 2 0 3 5 7 . 5 2 5 1 0 0 0 0 2 9 c 2 0 3 5 2 . 6 3 1 2 0 0 0 0 2 9 c 2 0 3 5 7 . 6 4 1 2 0 0 0 0 2 9 c 2 0 3 5 2 . 7 footed brackets for rectangular case style g (2 per capacitor) t r a p t e k c a r b e s a c r e b m u n t h g i e h 9 8 1 0 0 0 0 2 9 c 2 0 3 8 1 . 5 0 9 1 0 0 0 0 2 9 c 2 0 3 5 2 . 6 7 0 2 0 0 0 0 2 9 c 2 0 3 5 2 . 7 4 9 1 0 0 0 0 2 9 c 2 0 3 0 0 . 8 6 9 1 0 0 0 0 2 9 c 2 0 3 0 0 . 9 e s a c e d e l y t s 0 0 . 3 6 5 . 2 a * * 6 5 . 3 3 1 . 3 b 1 8 . 3 8 3 . 3 c 6 5 . 4 3 1 . 4 d ** cannot be used on a base size units with threaded terminals (aluminum covers). 15
? 2000 ge company mounting hardware (all dimensions in inches) universal wraparound brackets for oval case styles wraparound brackets for oval case styles case bracket part style number d e a 128a2244ac021 2.69 3.13 b 128a2244ab025 3.27 3.70 c 128a2244ab022 3.44 3.88 d 128a2244ab023 4.19 4.63 case bracket part style number d e w t a 9827065000021 2.56 2.94 0.50 0.02 b 9827065000031 3.06 3.50 0.63 0.02 c 614a301000061 3.31 3.81 0.75 0.03 d 614a301000051 4/06 4.56 0.75 0.03 16
please contact your ge sales reresentative for further information, or write to: ge industrial systems transmission, distribution & industrial systems 381 broadway fort edward, ny 12828-1000

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