Calculation of discharge resistance for capacitors

Capacitor discharge resistor design

Assuming UR = 50VDC, the above formula is simplified as follows:

• Low voltage (below 660V) t=60 seconds
• High voltage (above 660V) t=300 seconds
• t: Discharge time (seconds)
• k: Wiring parameters
• C: Capacitor capacity (µF)
• UN: Rated AC voltage
• UR: Residual voltage

(The set discharge time reaches the expected upper limit of residual voltage)

k=1 
k=3 
k=1/3  
k=1 
k=1 
k=3
k=1