Answer / aymaan

they r used to supply the substation auxillaries at
differnt voltage levels other than primary and secondary
also when we use ynyn0 connection in transformer a delta
tertiary is used to provide closed path for 3rd harmonics
which is not there in ynyn

Answer / gunasekaran

this is used for auto transformer not YNyno. the following
purpose are there
1.third hormonic supression.
2.we can get another additional voltage so we can use for
auxillary.
3.reactive power compensation we can put the capacitor on
tertiary we can compensate the reactive power

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