Author Archive

What is copy rewinding

If as noted earlier when details of manufacturer’s original winding are preserved the core can be made ready for rewinding. The points which will remain same as those of original windings are: Coils pitch Turns/ coils Connections

Types of re-lamping

There are two types of re-lamping: Groups re-lamping Sport re-lamping Group re-lamping Group re-lamping is a preventive approach. In this lamps are replaced to ensure a light level when lamps in the area reach 80% of their

Current balancing procedure

Thick over all possible combinations of phase load changes at each 3-phase connection point for either single-phase supplies or loads. When all selections have been made, consider the order in which loads are connected. It is so

Meter inaccuracies

Losses due to meter inaccuracies are n nothing but a difference between actual energy supplied to the consumer through the meters and amount registered by meters. When meters it gives negligible errors in the metering, it gives

What is power theft?

Power theft is a problem which has been plaguing a power utility a problem which has been plaguing a power utility since it’s service and accounts for a significant amount of high transmission and distribution losses in

What is copper losses

Occur same as in distribution line and are lesser in quantity as compared to core losses. Copper losses are nothing but dissipated heat by the current in primary as well as secondary winding which can be found

What are copper losses by conductor

Copper losses can be minimized by the use of greater diameter of the conductor wire and winding material with better resistivity. Casually choosing the thickness, increases eddy currents. In this regard, sectionalisation is preferred in order to

Metal halide lamps

Light in metal halide lamps is generated by an electric arc through a gaseous combination of mercury vapours and mixtures of metal components metal halides. These additional metal halides in discharge tube emit their own spectra. This

Compare positive feedback and negative feedback

The parameter of comparison Positive feedback Negative feedback The overall phase shift 0 or 3600 1800 Feedback signal and the input signal. In phase. Out of phase. Input voltage. Increase due to feedback. Decrease due to feedback.

What is transposition

Transposition of conductors is meant that the exchanging of the position of the power conductor at regular intervals along the line so that each conductor occupies the position of every other conductor over equal distance. Transposition took
Follow @PolytechnicHub