Why 3.5 cores in cables

And t he return conductor is called as Neutral. When there is some degree of unbalance and the amount of fault current is very small, then 3. In these types of cables, a neutral of reduced cross section as compared to the 3-main conductors is used, which is used to carry the small amount of unbalanced currents.

Electrical Engineer. Content Creator. Construction of 3. Underground Cable construction. Balanced System. Unbalanced System. Post Tags: Equipment Others. Posted In: Others Tutorials. Gaurav J Electrical Engineer. All stories by: Gaurav J. If the loads are almost balanced and there is no significant electronic loads, you can select 3. Some cable manufacturers can now supply cable with a neutral 1.

Click to expand What are the examples of significant electronic loads? Measuring without cables??? We can say that 3-phase load is balanced, when load impedance in each phase has same value.

This means that resistance and reactance in every phase has same value , i. This means all the loads that generate harmonic distortion in the power grid. I think post 8 is sufficient to explain this question You should also examine the national regulations for supply cables. How to measure the load impedance in each phase?

How to measure the reactance in every phase? Here is one way to find some approximate values Last edited: Jan 13, And, what is 2. Is it an another load???? Presume, pure real power input without imaginary reactive part. Similar threads A. What's the architecture of dual core processor?

Started by achusr Jul 16, Replies: 1. Elementary Electronic Questions. What's the advantage of the howland circuit??? Started by kennyg Mar 12, Replies: 1. It is not likely in such cases that the loads will be identical, so the neutral will carry the out-of-balance current of the system. The greater the degree of imbalance, the larger the neutral current. Generally in the case of linear loads, the neutral only carries the current due to imbalance between the phases.

THE 3. An important example of 3-phase load is electric motor and that is why, they are fed through 3-Core cables in most cases. When there is some degree of unbalance and the amount of fault current is very small, then 3.