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當較高頻率的電流注入到變壓器時，將產生趨膚效應和鄰近效應，在變壓器繞組中引起附加損耗，與變壓器鐵芯有關的鐵損亦會增加。變壓器將產生過熱現象。
諧波電壓還會使變壓器激磁電流增大、效率降低，功率因數下降，當諧波電壓長期存在且較為嚴重時，將會危及變壓器絕緣層。
2、諧波對電力電容器的影響
當電容器組回路阻抗呈容性時，并聯電容器對諧波電流起放大作用，特別是當系統等值感抗和電容器組回路容抗構成諧振條件，產生電流諧振時，即使較小的諧波電流也會放大若干倍，致使電容器的損耗急劇增加引起電容器過熱或損壞；
另外，諧波電壓值增高使電容器的損壞系數和附加損耗增加，導致容易發生故障和縮短電容器的使用壽命。
3、諧波對電力線路及用電設備的影響
當諧波電流通過架空線時，可能產生串聯諧振，甚至造成危險的過電壓。電力電纜在諧波電壓作用下，絕緣強度降低，泄漏電流增大，使壽命縮短。
此外，諧波還會對旋轉電機、繼電保護和自動裝置工作的可靠性、測量和計量儀器的準確性產生嚴重的不利影響。
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