Considering the effects of non-liner loads to create harmonics and replacing these loads instead of household, commercial and industrial customers, create many voltage disturbances every year. Harmonics will cause specific problems in the power distribution networks. Some of these problems could be unsuitable function of equipments from these networks, decreasing their lifetime and their efficiency. Therefore, we need to study harmonics and show the way to resolve these problems. Limiting harmonics is very important for utility companies and their subscribers. Utility companies must provide against to damage on subscribers from these problems. Since Utility companies could not guarantee a sine wave to protect their subscribers from voltage disturbances; therefore, these subscribers must limit their disturbances of their equipments. One statistics indicated twenty-five percent of transformers utilized in the utility companies of Iran have about eighteen year's lifetime only. So, maintenances of transformers in the utility companies become very important. Once we replace one of these transformers, we need to analysis its malfunction. The study of malfunction will provide us with a reasonable solution. Therefore, we are trying at this paper to show why we need to study the effects of harmonics on transformers of power distribution networks. The effects such as increasing load and no-load power losses, reducing the power of transformers and Destructive Effects create more heat in them. Consequently, we identify and record harmonics on a sample load and calculate Destructive Effects that created in its transformer by these harmonics, at this condition, be increase the transformer's heat by non-liner loads, to cause its insulation life decrease as well as transformer life.
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