繁體：均壓電阻
均压电阻是用于电容器组串联连接时，通过提供受控泄漏路径来均衡各电容器电压的被动元件。
均压电阻是专门用于电容器组中多个电容器串联连接的被动电气元件。其主要功能是通过提供受控泄漏路径来均衡每个电容器两端的电压，补偿电容值和绝缘电阻的差异。这防止了单个电容器承受过电压条件，从而避免介质击穿、热失控或灾难性故障。这些电阻通常是高阻值、高精度的元件，具有优异的长期稳定性和低温度系数，以在各种环境条件下保持一致的性能。 均压电阻基于通过受控并联电阻进行电压分配的原理工作。当电容器串联时，电容或泄漏电流的微小变化可能导致电压分布不均。通过在每个电容器上并联一个高阻值电阻，电阻创建了一个平衡的电流路径，迫使每个电容器上的电压降相等。电阻值根据电容器规格和系统电压仔细计算，以确保电容器之间的电压差保持在安全范围内，通常为每个电容器额定电压的5-10%以内。
诱因 → 失效模式 → 工程缓解
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Balancing resistors are essential because capacitors in series naturally develop uneven voltage distribution due to manufacturing tolerances and aging effects. Without balancing, some capacitors could experience overvoltage leading to premature failure, reduced lifespan, or catastrophic breakdown of the entire bank.
The resistor value is calculated based on the maximum allowable voltage unbalance, capacitor capacitance, and system voltage. Typically, resistors are sized to draw 1-5 mA of current at rated voltage, with values selected to keep voltage unbalance below 10%. The formula involves the capacitor's leakage current characteristics and desired balancing current.
Failed balancing resistors can lead to uneven voltage distribution across capacitors, causing some capacitors to operate above their rated voltage. This accelerates dielectric aging, increases leakage current, generates excessive heat, and may eventually cause capacitor failure, potentially resulting in short circuits, explosions, or complete bank failure.
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