Rated AC voltage UNAC:repetedly used in the design capacitor 

waveform either polarity,the maximum operating peak cyde voltage.

Rated DC voltage of the UNDC:polarity in any of the non-repetitivewaveform used in the design capacitor continuous operation of 

the maximum operating peak voltage.

Root mean square of max.permissibe value of sinusoidal a.c. 

Voltage in continuous operation.

Peak-to-peak alternating component of the unidirectional voltage.In 

general,the square of the ripple voltage rms should be less than 10%

of the rated voltage.

Peak voltage induced by aswitching or any other disturbance of the 

system which is allowed for a limited number of times and for 

durations shorter than the basic period.

Routine test of all capacitors conducted at room temperature,prior to 

delivery.A further test with 80% of the test voltage stated in the data 

sheet may be carried out once at the user’s location.

Routine test of all capacitors between short-circuited terminals and 

case,conducted at room temperature.May be repeated at the user’s 

location.

When designing capacitor capacitor terminals on the shell or root 

value of ac voltage of the party. If not stated,thet insulation voltage is 

equal to the rated voltage (DC)divided by the square root of√2; 

Or equal to rated voltage(AC)

It indicates the failure probability of components in unit time and the value is the number of failure components in unit time compared to the 

total number of components.The unit of λ is FIT (also expressed as Fit or fit)and 1FIT=1/（109 hrs）.For example,10000pcs of components work at 

given conditions for 10000 hrs and 10 pcs of components failed,so λ=10/（10000×10000）=100FIT.

Maximum permitted repetitive peak current that can occur during 

continuous operation.The value is following:Î=CN×（dv/dt） 

Where dv/dt indicates rate of voltage rise,which means 

maximum permitted repetitive rate of voltage rise of 

operational voltage usually using instead of Î.