fault frequency
连接介质出现故障次数 carrier
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配置有载调压的变压器在有载调压开关出现异常时，为抑制恶化趋势，避免突发故障，采取了减少调压开关动作次数的措施。
Two practical methods are introduced to renovate the power transformer with no-load tap changer into that with on-load one.
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