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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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Transformers

Star-Delta Transformer Connection Overview

In this type of transformer connection, then primary is connected in star fashion while the secondary is connected in delta fashion as shown in the Figure 1 below. The voltages… Read more

Jun 10, 2012 | By jiguparmar

General Electric power transformer nameplate (50 MVA Substation Power Transformer with Load Tap Changer)
Energy and Power

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 | By jiguparmar

220kV Class 110kV Class Single Phase Traction Transformer
Energy and Power

Understanding Vector Group of Transformer (Part 1)

Three phase transformer consists of three sets of primary windings, one for each phase, and three sets of secondary windings wound on the same iron core. Separate single-phase transformers can… Read more

Jun 03, 2012 | By jiguparmar

Understanding Vector Group of Transformer (Part 1)
Power Substation

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 | By jiguparmar

Dry type cast resin transformer
Maintenance

Measurement of insulation resistance (IR) – 2

Continued from first part: Measurement of insulation resistance (IR) – Part 1 1. IR Values For Electrical Apparatus & Systems 2. IR Value for Transformer 3. IR Value for Tap Changer… Read more

Apr 29, 2012 | By jiguparmar

Fluke insulation resistance tester up to 10kV
Cables

Measurement of insulation resistance (IR)

The measurement of insulation resistance is a common routine test performed on all types of electrical wires and cables. As a production test, this test is often used as a… Read more

Apr 28, 2012 | By jiguparmar

Megger MIT1020 10-kV insulation resistance testers are all designed specifically to assist the user with the testing and maintenance of high voltage equipment
Electric Motor

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 | By jiguparmar

Direct Online Motor Starter - Square D
High Voltage

How HV transmission lines affects humans and plants?

By increasing population of the world, towns are expanding, many buildings construct near high voltage overhead power transmission lines. The increase of power demand has increased the need for transmitting… Read more

Mar 20, 2012 | By jiguparmar

How HV transmission lines affects humans and plants?
Energy and Power

The real truth behind household power savers

A household power low voltage saving devices has recently received a lot of attention from both consumers and manufacturers. It is generally used in residential homes to save energy and… Read more

Mar 07, 2012 | By jiguparmar

Household Power Saver
Electrical Lectures

Types of neutral earthing in power distribution (part 2)

Resistance grounding has been used in three-phase industrial applications for many years and it resolves many of the problems associated with solidly grounded and ungrounded systems. Resistance Grounding Systems limits… Read more

Feb 09, 2012 | By jiguparmar

Low voltage switchgear - Power distribution
Cables

EHV/HV Underground Cable Sheath Earthing (part 1/2)

In urban areas, high voltage underground cables are commonly used for the transmission and distribution of electricity. Such high voltage cables have metallic sheaths or screens surrounding the conductors, and/or… Read more

Jan 19, 2012 | By jiguparmar

21/35(40.5)KV 3-core XLPE/PVC/steel tape armor power cable
Electric Motor

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 | By jiguparmar

Motor terminal box
Protection

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 | By jiguparmar

Transformer protection - Aabstract from NEC (National Electric Code)


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