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Define: primary and secondary distribution system 

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i) Primary Distribution:

 It is a 3-phase, 3-wire transmission line connected in between receiving substation to Distribution substation. OR It is link between receiving substation & distribution transformer

ii) Secondary Distribution:

 It is a 3-phase, 4-wire Distribution line in between Distribution substation to consumer line. OR It is link between distribution transformer substation & consumer. 
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