Question

1. What are the undesirable effects of too much voltage variation on a distribution circuit ?

2. What are the effects of diversity factor on the maximum load of a distribution transformer ?

3. Where does the greatest current density occur in a distribution feeder ?

4. What is the controlling factor in determining the size of a distributor ?

5. In which situation is secondary distribution eliminated ?

Answer 1

1)The performance of load equipment is poor, that means more fluctuations in voltage causes excesssiv vibrations in motor and decresesd the mechanical strenth and service of motor life also the flickering of bulbs will occur

2) ​​​​​​diversity factor = installed load / running load

Diversity factor can be used to estimate the total load required for a facility or to size the transformer

  relation:if the load on the distribution increases then diversity factor decreses.

3)generally the current density will be higher at the point of distributor where more number of tappings are connected

4) controlling factors for size of distributor feeder :

a)current carrying capacity of distributor feeder

b)allowab al Voltage drop

c)breakdown strength of the conductor

5) secondary distribution is uesd to supply single phase loads.so when all the loads are 3 phase loads then there is no need of sencondary distribution as primary distribution can directly supply 3 phase loads