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Author Archive for: Jignesh Parmar

Jignesh Parmar

74 awesome technical articles.

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Jignesh Parmar has completed M.Tech (Power System Control), B.E (Electrical). He is member of Institution of Engineers (MIE), India. He has more than 13 years experience in transmission & distribution-energy theft detection and maintenance electrical projects.

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Understanding Vector Group of Transformer (2)

Continued from first part Understanding Vector Group of Transformer (part 1) Vector Groups are the IEC method of categorizing the primary and secondary winding configurations of 3-phase transformers. Windings can… Read more

Jun 04, 2012 | jiguparmar

220kV Class 110kV Class Single Phase Traction Transformer

Transformer Connection Star-Star

The windings of three phase transformers may be connected in by Y or Δ in the same manner as for three single phase transformer. Since the secondary’s may be connected either… Read more

May 23, 2012 | jiguparmar

Dry type cast resin transformer

Direct On Line (DOL) Motor Starter

Different starting methods are employed for starting induction motors because Induction Motor draws more starting current during starting. To prevent damage to the windings due to the high starting current… Read more

Apr 22, 2012 | jiguparmar

Direct Online Motor Starter - Square D

NEC Code for Size of Cable for Motor

Size of Cable for Branch circuit which has Single Motor connection is 125% of Motor Full Load Current Capacity. What is the minimum rating in amperes for Cables supplying 1… Read more

Dec 30, 2011 | jiguparmar

Motor terminal box

Transformer Protection – Abstract from NEC

According to NEC 450.4, “each transformer 600 volts, nominal, or less shall be protected by an individual overcurrent device installed in series with each ungrounded input conductor.” Such overcurrent device… Read more

Dec 26, 2011 | jiguparmar

Transformer protection - Aabstract from NEC (National Electric Code)


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