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The wave trappers are used to control the frequency of of the power supply from transmission lines.. for example in India we need 50 Hz supply, but from the supply lines we will receive the supply in (say) 54Hz. In order to obtain 50 Hz, wave trappers are used in sub-stations or in switch yards..
hence the wave trappers are located initially in-between the lightning-arrester and the current transformer in the primary side as shown below:
power supply - lightning arrester - wave trapper - current transformer - ......-primary of the transformer
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