TN-S with and without Neutral conductors

Nick Parker over 3 years ago

Hello everyone,

What are the advantages/disadvantages of using TN-S system with and without Neutral conductors?. Where does it find its application?

ef55b21f1eb9a73bb3f7e8e85eaf7368-huge-tns_without-neutral.png — Without Neutral

387a1fc1393546c05a30da338234ce61-huge-tns_with-neutral.png — With Neutral

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0 Harry Macdonald over 3 years ago

The other place I have seen three phase without neutral is in large data centre where there is a real danger of large 3rd harmonic currents. In a worst case situation, (power supplies at 60% of full load) the 3rd harmonic in the neutral can be twice the phase current.
The remedy in some places is to put a delta star transformer at every distribution board and supply the transformer with 3 phase, no neutral. You then can't get 3rd harmonics on the main system.
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0 Harry Macdonald over 3 years ago

The other place I have seen three phase without neutral is in large data centre where there is a real danger of large 3rd harmonic currents. In a worst case situation, (power supplies at 60% of full load) the 3rd harmonic in the neutral can be twice the phase current.
The remedy in some places is to put a delta star transformer at every distribution board and supply the transformer with 3 phase, no neutral. You then can't get 3rd harmonics on the main system.
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TN-S with and without Neutral conductors

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