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當(dāng)較高頻率的電流注入到變壓器時(shí)，將產(chǎn)生趨膚效應(yīng)和鄰近效應(yīng)，在變壓器繞組中引起附加損耗，與變壓器鐵芯有關(guān)的鐵損亦會(huì)增加。變壓器將產(chǎn)生過(guò)熱現(xiàn)象。
諧波電壓還會(huì)使變壓器激磁電流增大、效率降低，功率因數(shù)下降，當(dāng)諧波電壓長(zhǎng)期存在且較為嚴(yán)重時(shí)，將會(huì)危及變壓器絕緣層。
2、諧波對(duì)電力電容器的影響
當(dāng)電容器組回路阻抗呈容性時(shí)，并聯(lián)電容器對(duì)諧波電流起放大作用，特別是當(dāng)系統(tǒng)等值感抗和電容器組回路容抗構(gòu)成諧振條件，產(chǎn)生電流諧振時(shí)，即使較小的諧波電流也會(huì)放大若干倍，致使電容器的損耗急劇增加引起電容器過(guò)熱或損壞；
另外，諧波電壓值增高使電容器的損壞系數(shù)和附加損耗增加，導(dǎo)致容易發(fā)生故障和縮短電容器的使用壽命。
3、諧波對(duì)電力線路及用電設(shè)備的影響
當(dāng)諧波電流通過(guò)架空線時(shí)，可能產(chǎn)生串聯(lián)諧振，甚至造成危險(xiǎn)的過(guò)電壓。電力電纜在諧波電壓作用下，絕緣強(qiáng)度降低，泄漏電流增大，使壽命縮短。
此外，諧波還會(huì)對(duì)旋轉(zhuǎn)電機(jī)、繼電保護(hù)和自動(dòng)裝置工作的可靠性、測(cè)量和計(jì)量?jī)x器的準(zhǔn)確性產(chǎn)生嚴(yán)重的不利影響。
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