A bleeder resistor is an optional safety component in filter capacitor banks that safely discharges stored electrical energy after power disconnection.
A bleeder resistor is a passive electrical component installed across filter capacitor terminals in capacitor banks to provide a controlled discharge path for residual voltage. This prevents dangerous electrical shocks during maintenance by ensuring capacitors discharge to safe levels within specified timeframes after system de-energization.
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Bleeder resistors are optional because some systems use alternative discharge methods like discharge coils, automatic discharge circuits, or rely on manual discharge procedures during maintenance. However, permanent bleeder resistors provide continuous safety protection.
Failed bleeder resistors create hazardous conditions where capacitors retain dangerous voltage levels. This can cause severe electrical shocks during maintenance. Regular testing and visual inspection are essential for safety.
Calculate resistance using R = t / (5×C) where t is desired discharge time and C is capacitance. Ensure power rating exceeds V²/R to handle worst-case discharge energy. Consult IEC 60252 for specific requirements.
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