Leakage Current and Capacitance Discharge Calculator for X capsThe selection of an AC line filter influences how a piece of equipment will perform during product safety tests. S
discharge is an issue of the X capacitance of the filter. Leakage current is primarily a function of the Y capacitance. Enter the valucapacitors and Y capacitors implemented in the line filter you are considering to get an idea of how the filter will perfom during a sanalysis.
Total nominal X capacitance:Total nominal shunt resistance:Nominal, one branch, Y capacitance:Mains voltage (worst case):Mains frequency (worst case):4uF400kOhms10.8nF120V rms60HzUse 10 M Ohms if there is no shunt resistance (probe r
With these values the results of your safety tests will look approximately like those shown below.
Leakage current from line to ground:0.4886mACommon limits are .75mA for ungrouand 3.5mA for grounded equipment.
Time constant of capacitance discharge:Peak voltage across pins after one second:Voltage across pins after ten seconds:1.600s90.84V peak0.33V peakNormally, the voltage across the plug pins must be less
62.79V peak
one second after being disconn
from the supply. Industrial twist lock
the same limit, but ten seconds after disconnection fromsupply.
caps and Y capssts. Specifically, capacitance
f the Y capacitance. Enter the value of the Xhow the filter will perfom during a safety
hunt resistance (probe resistance).
ngrounded equipment,
ded equipment.
e across the plug pins must be less thanone second after being disconnected
lock connectors must comply with
n seconds after disconnection from their
