302C920000113 GE, 302C920000113 Datasheet - Page 12

• Manufacturer Part Number: 302C920000113
• Description: CAP FOOTED BRACKET, 2.88" HEIGHT
• Manufacturer: GE

Specifications of 302C920000113

• Accessory Type: Footed Capacitor Bracket
• Leaded Process Compatible: No
• Peak Reflow Compatible (260 C): No
• Applications: Oval Capacitors
• Rohs Compliant: No
• For Use With: Oval Capacitors, 2.88" Height

Application Data for SCR and Snubbers Capacitors
This Application Note is designed to allow users
to select the correct capacitor for two common
conditions encountered in power electronic circuits:
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.
2.
3.
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:
Voltage:
Ambient Temperature: 65 °C
Current Pulsewidth = 166 µs
Peak Voltage
RMS Current
For use with capacitor series:
(a) Sinusoidal waveform
(b)
(1) Microfarad value required
(2)
(3)
(4) Current pulsewidth
(5) Capacitor ambient temperature.
Select a capacitor with the correct
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.
Determine the following:
capacitance and a peak voltage equal to or
greater than the application voltage.
A97F8600/ A97F8700
Squarewave.
Peak voltage
RMS current
= 2p x 3000 x 10 x 10 -6 x 200
= 200 x Ö2 = 283 Volts
= 37.7 A
10 mF
200 Vac RMS 3 kHz
Sinewave
© 2000 GE Company
11
The A97F8672 has a current rating of 136 A.
Applying the correction factors for a 166 ms
pulsewidth and a 65 °C ambient:
Example No. 2
Capacitance:
Voltage:
Ambient T emperature: 65°C
Current Pulsewidth
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:
Voltage:
Frequency:
Rise Time:
Fall Time:
Ambient Temperature: 65°C
Peak Voltage
I peak =
I rms = 313
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 65°C is 0.75, and for a 60 µs 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.
Peak Voltag
RMS current
RMS current rating = 136 x 0.56 x 0.75
Note the terminal limit of 60 amps.
This capacitor is satisfactory.
CDV
0.64t
Ö
60 x 10
-6
=
=
x 200 = 32.4 A
5 µF
60 Vac RMS 16.6 kHz
Sinewave
= 60 Ö2 = 85 V
= 2 p x 16,600 x 5 x 10
= 31.3 A
= 3 0 µs
20 µF
600 Vpeak unidirectional
squarewave
200 Hz
60 µs
60 µs
600 V
20 x 10
0.64 x 60 x 10
= 57.1 A
-6
x 600
-6
= 313 A
-6
x 60