Answer / makku

Because of the construction of the transformer core/winding assembly, there can be high potentials induced into the core, causing partial discharges which will damage the transformer. The core ground diverts this voltage safely to ground. The core ground also provides a low-resistance path to ground if there is a short circuit between the winding and the core, allowing protective relaying to detect it. The core ground may be brought out to a separate, external bushing or it may be connected internally, with cost being the driving factor as to its location. As it is with most investments, you get what you pay for.

Answer / mohd fazil

for the core to acquire charges to get into a potential which may cause insulation failure between the leads of the transformer to the core so the core is earthed in ...

Answer / kayode

In order to complete a circuit of flowing curent, cause curent is directly propotinal to power and inversely propotional to voltage

what is the diference between the 4pole & 6pole DC Motors & what is advantage 6pole over the 4pole ?

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iii) A shunt motor runs at 70 rad/sec from a 460V supply and takes in an armature current of 100A. Resistors of 2.52 ohms and 1.64 ohms are connected in series with the armature and in parallel with the armature respectively. The field excitation remains direct from the 460V supply but the generated torque is halved. Determine the new running speed. Neglect brush voltage drop. The armature resistance is 0.4 ohms. [15]

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If a generator of generating station produces 100MW rated output then what will be the rating of the step-up transformer connected to it?

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I have 4 DG set with 1500KVA rating. system breakers are 11KV & alternator are 415 Volts. i want to Know what is max. resistance for body earthing & 415 & 11KV V Neuteal earthing. my fault current is 14 times for 2 sec.

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how can we rotate a single phase motor (without cap.)in reverse direction?

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Alternator couple to diesel engine why, Alternator couple to ac service motor with gear drive for 1500 rpm possible (yes or no) aim to low input power supply give to motor then high output power taken for alternator Please answer this question

1 Answers   Turbo,

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can we measure +,-.zero sequence current ....? if so how can ???

2 Answers   NLC,

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WHAT IS THE SETTING OF OVERLOAD RELAY AND UNDER VOLTAGE RELAY IN PERCENTAGE?

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can you please send me the technical questions and aptitude questions of honeywell and jindal steel electrical engg. question paper my e-mail ID is(kkesavanraj@gmail.com)

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How to select the cable and voltage drop in circuit?

0 Answers   DEWA,

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now-a-days which devices are using for converter

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what is the difference between the electrical and electronic choke?

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