What is the value of internal discharging resistors used in varplus can capacitors?
The value of discharging resistor inside can be easily calculated based on declare discharging time: remaining voltage below 50V is achieved after 60seconds.
Attached excel file shows the calculation. Example applicable for BLRCH250A300B44 with rated values shown in column B.
If you change value of Rd you will see the time when voltage on each capacitor will surely be below 50V.
In case of BLRCH250A300B44 the limits seems to be 173kOhm, but then nearest lower type value of resistance is 150kOhm. Therefore you can consider 150kOhm as resistance of each (out of 3) resistor connected in parallel to each capacitor (means in each phase).
You can apply xls on any BLRCH providing that input data in column B are set according to BLRCH datasheet.
Attached excel file shows the calculation. Example applicable for BLRCH250A300B44 with rated values shown in column B.
If you change value of Rd you will see the time when voltage on each capacitor will surely be below 50V.
In case of BLRCH250A300B44 the limits seems to be 173kOhm, but then nearest lower type value of resistance is 150kOhm. Therefore you can consider 150kOhm as resistance of each (out of 3) resistor connected in parallel to each capacitor (means in each phase).
You can apply xls on any BLRCH providing that input data in column B are set according to BLRCH datasheet.
Publié pour: Schneider Electric Belgium
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