The capacitive windings, of not-inductive type, has very low equivalent series inductance L_ES, very low equivalent series resistance R_ES and  low dielectric losses Tgd₀  so they can stand  all these severe applications.

Rated DC voltage is the maximum peak recurrent voltage of a not reversing type wave form, of  either polarity, that may be applied continously.

Rated AC alternating-sinusoidal voltage marked on the capacitor

Non recurrent surge voltage is the maximum peak voltage that can be applied for a limited number of times and with duration shorter than 10 ms.

The rated current is the maximum r.m.s. current that  may continuosly flow through the capacitor at the maximum  case temperature of 85°C, function of  the ambient cooling and temperature.

Maximum recurrent peak current that may be applied continuosly

Maximum non recurrent peak current that may be applied for a limited number of times

pulse duration is the duration of the charge/discharge  process from one to the other voltage  state  without over shoot or continous oscillations.

Duration of fundamental oscillation (period)

1/T foundamental frequency

Maximum voltage rise time during the charging or discharging of the capacitors; is expressed in voltage per microsecond (V/ms) and  corresponds to the maximum peak current  per microfarad (A/mF).

Is the resistance produced by the internal electrodes and connections

RS + (Tgd₀ / 2*p*f*C) = Equivalent Series Resistance  represents the total losses of the capacitor, included the dielectric losses, the measure is at 1 kHz.

Les

Equivalent Series Inductance is expressed  in nano-Henry (nH) and is measured at self resonane-frequency.

2 * 10^-4 = Dielectric dissipations factor

w * C * R_ES = Tgd₀  + w * C * R_S = Total dissipation factor

I²_RMS * R_S + U² * p * f * C * Tgd₀ = P_R + P_P      Total Power dissipation is the sum of P_R (in connections and electrodes) and P_p (losses in dielectric) where is U = (U₁+U₂)/2 (with asimmetrical wave shapes and U₁ and U₂ £ U_DC) and U=U_DC (with simmetrical wave shapes)

Time constant between terminals is the product of insulation resistance between terminals (MW) and the capacitance in (mF)  and it is expressed in seconds.

Insulation Resistance between terminals and casing

Natural Thermal Dissipation Coefficent is the typical value that allows to calculate the temperature rise of the capacitor case, over the ambient temperature during natural air cooling at the working conditions I_RMS and  j₀

0,6 x K_n = forced thermal dissipation coefficent with forced air-cooling  2m/s

Operating ambient temperature

Case temperature must be measured at 2/3 of the height of the case

j_C - j₀ = K_N * P Temperature rise of the capacitor case over ambient temperature

Cooling air speed (m/s)

Reliability

λ

expected number of failure in 10⁹ components-hours within the nominal working conditions (voltage-current-temperature case)

Ln

expected life at nominal working condition U_RMS and case temperature j_C = 85°C with the prescribed number of failures in 10⁹ components-hours

λ*Ln

relative failure rate £ 3%

Lx

expected life at different voltage U_x and case temperature j_X  (¹ 85 °C )

Lx

L_N * (U_N/U_X)⁸  * e exp 2,5*{1-[(j_X+273)/358]¹⁴}with U_N/U_X ³ 0,9 e  j_X £ 90 °C

Typical current wave shapes