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Why is 50 hz 690V preferred over 440V in electric systems . Is there any benefits for 690V over 440V or vice versa . please answer?
Wiki User
∙ 12y ago
At 690V the currents are smaller resulting in smaller rated equipment (smaller cables, Transformers, switchboards, equipment ..etc)
at 690V the running current is reduced by40% compared to the 400V system
and the energy losses due to hear are much smaller compared to the 400V system.
many motors are on the border line for a service voltage of 400V but they can easily be accommodated at a service voltage of 690/400V.
refer to IEC 60038 edition 6.2 2002-07.
Wiki User
∙ 12y ago
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