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TECHNICAL DATA |
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Terminology |
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Rated capacitance (C) |
The value of capacitance marked on the capacitor. |
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Rated voltage (VR) |
The value of the peak voltage to which the capacitor can be charged for rated life expectancy. |
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Energy of the capacitor (E) |
The value of the energy which can be stored in the capacitor calculated as follows: E = 1/2 x C x (VR)2 where E is in joules, C is in microfarad and VR is in kilo volts. |
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Repetition Rate / Duty cycle |
The frequency at which a capacitor is being charged and discharged including the idle time. |
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Percentage voltage reversal- |
This is the percentage of the peak voltage in reverse direction after first half cycle of the freely oscillating frequency after a capacitor is discharged to the peak charging voltage before discharge. |
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Peak discharge current |
The maximum value of the current that can be discharged through the capacitor. |
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Equivalent series inductance (ESL) or self-inductance |
The internal series equivalent inductance of the capacitor winding and their connections inside a capacitor unit. |
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Equivalent series resistance (ESR) |
The internal series equivalent resistance of the capacitor. |
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Life expectancy |
The number of charge and discharge cycles under rated conditions for which the capacitor is designed. |
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Charging time |
The specified time to charge the capacitor to its full rated voltage, starting from zero. |
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Discharging time |
For underdamped or oscillatory discharges, it is the time in which the capacitor discharges from a voltage of peak rated value to zero. For overdamped discharge, it is the time in which the capacitor voltage drops to 50% of it's charge voltage or energy drops to 25% of its charged energy. |
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Hold time |
The specified time for which the capacitor is held under charged conditions before starting to discharge. |
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Ringing frequency |
The natural resonance frequency expressed in Hz of a capacitor due to its own capacitance and self-inductance. |
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Tangent of loss angle |
The tangent of angle in a vector diagram, borne by the equivalent resistance and total capacitance. |
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Crow barring |
Shorting the output of the capacitor effectively at any point on the self-oscillating cycle of a capacitor in discharge. |
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Total D.C. life |
Cumulative period in hours over which a capacitor can be charged at full voltage and held there under charged conditions. |
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Leakage current and insulation resistance |
Leakage current is the trickle current required to hold the capacitor continuously at its rated voltage. It is equal to rated voltage divided by it's insulation resistance. |
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Permissible Tolerances |
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On capacitance values +/-10% on individual unit |
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