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.pptx  EARTHING TRANSFORMERS.PPTX (Size: 421.06 KB / Downloads: 35)


Normally power systems and net works are operated under variable complex stresses. In power systems the faults are not avodable even after taking utmost care at every stage-from planning to maintainance. The grounding of a circuit reduces potential stresses under fault condition. Power feeding from delta delta or if there is no accessibility for star connected transformers occasionally shorted to ground is very common-un-intentional grounding occurs any where from the feeding system to utilization equipment The main objective of grounding neutral is to make a short circuit current sufficient in magnitude for the relay action. This article restricted to zig-zag type with oil filled transformers. The neutral point is usually available at every voltage level from generator to transformers. In the absence of a power transformer of suitable capacity, connection and design a separate grounding transformer can be used . They are inductive devices intended primarily to provide a neutral point for grounding purpose. The main purpose of this paper is to discuss about the difference between Earthing transformer and Power transformer and to discuss about the designing of earth transformers.


The selection any transformer mainly by two factors-namely, primary voltage and load .For an earthing transformer load is short time or short duty ( only at the time of fault) ,normally from a few seconds to one minute

Significance of zero sequence parameters

In symmetrical components the positive sequence is one having normal phase sequence; the second is of negative sequence with reversed phase sequence; and the third that has no sequence and is called zero sequence - are important parameters. An earth fault is one that part of the current in the faulty phase returns to the supply through the earth. This is due to a symmetrical component consisting of three single phase currents - one in each line, and all being in phase.

Why inter-connected star winding is preferred?

The purpose to establish a suitable ground path can be achieved with the help of three pairs of concentric coils connected to oppose ampere turns. As the fluxes oppose, the transformer takes a very small magnetizing current during normal condition. Lines of force enclosing both coils on one limb are therefore impossible. The earth fault current finds little impedance. This connection has unique characteristics, and is preferred to other types of neutral deriving transformers.

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