Jignesh Parmar
74 awesome technical articles
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 20 years experience in transmission & distribution-energy theft detection and maintenance electrical projects.
High Voltage
Electrical Safety Standards for LV/MV/HV (Part-2)
Continued from part 1 – Electrical Safety Standards for LV/MV/HV (Part-1) Standard: Northern Ireland Electricity (NIE), 6/025 ENA Clearances of Electrical Line to Ground and Roads Clearances of Electrical Line… Read more
Nov 12, 2012 | By jiguparmar
High Voltage
Electrical Safety Standards for LV/MV/HV (Part-1)
Standard: Western Power Company Water Safely Clearance on Electrical Fires Minimum Approach Distance for Authorized Person Minimum Approach Distance for Ordinary Person Minimum Approach Distance for Vehicle and Plant for… Read more
Nov 07, 2012 | By jiguparmar
Energy and Power
Safety Clearance Recommendations for Transformer
Clearance from Outdoor Liquid Insulated Transformers to Buildings (NEC) Clearance between Two Outdoor Liquid Insulated Transformers (NEC) Dry Type Transformer in Indoor Installation (NES 420.21) Dry Type Transformer in Outdoor… Read more
Oct 24, 2012 | By jiguparmar
Energy and Power
Safety Clearance Recommendations for Electrical Panel
Working Space around Indoor Panel/Circuit Board (NES 312.2) Clearance around an Indoor electrical panel (NEC 110.26) Clearance for Conductor Entering in Panel (NES 408.5) Clearance between Bare Metal Busbar in… Read more
Oct 10, 2012 | By jiguparmar
Protection
Overcurrent protection of transformer (NEC 450.3)
The overcurrent protection required for transformers is consider for Protection of Transformer only. Such overcurrent protection will not necessarily protect the primary or secondary conductors or equipment connected on the… Read more
Oct 08, 2012 | By jiguparmar
Energy and Power
What is the difference between Bonding, Grounding and Earthing?
One of the most misunderstood and confused concept is difference between Bonding, Grounding and Earthing. Bonding is more clear word compare to Grounding and Earthing, but there is a micro… Read more
Sep 27, 2012 | By jiguparmar
Transmission and Distribution
Qatar General Electricity and Water Corporation – Recommendations for Safety Clearance
Service Vertical Clearance (Min) Water Line (to cross below EHV cable level) 0.5 Meter Sewerage Mains (to cross below EHV cable level) 1.0 Meter Drainage Mains (to cross below EHV… Read more
Sep 15, 2012 | By jiguparmar
Energy and Power
Floating Neutral Impacts in Power Distribution
If the Neutral Conductor is opened, broke or lost at either of its source side (Distribution Transformer, Generator or at Load side – Distribution Panel of Consumer), the distribution system’s… Read more
Aug 27, 2012 | By jiguparmar
Energy and Power
Principles of Transformers in Parallel Connection (part 2)
Continued from first part – Principles of Transformers in Parallel Connection (1) All parallel units must be supplied from the same network. Secondary cabling from the transformers to the point… Read more
Aug 08, 2012 | By jiguparmar
Energy and Power
Principles of Transformers in Parallel Connection
For supplying a load in excess of the rating of an existing transformer, two or more transformers may be connected in parallel with the existing transformer. The transformers are connected… Read more
Aug 06, 2012 | By jiguparmar
Energy and Power
Delta-Star Transformer Connection Overview
In this type of connection, the primary connected in delta fashion while the secondary current is connected in star. The main use of this connection is to step up the… Read more
Jul 10, 2012 | By jiguparmar
Energy and Power
Delta-Delta Transformer Connection Overview
In this type of connection, both the three phase primary and secondary windings are connected in delta as shown in the Figure 1: The voltages on primary and secondary sides… Read more
Jul 06, 2012 | By jiguparmar
Energy and Power
Autotransformer Connection Explained
An ordinary transformer consists of two windings called primary winding and secondary winding. These two windings are magnetically coupled and electrically isolated. But the transformer in which a part of… Read more
Jul 02, 2012 | By jiguparmar
Transformers
ZigZag Transformer Connection Overview
The zigzag connection of tranformer is also called the interconnected star connection. This connection has some of the features of the Y and the ∆ connections, combining the advantages of… Read more
Jun 15, 2012 | By jiguparmar
Transformers
Scott-T Transformer Connection Overview
There are two main reasons for the need to transform from three phases to two phases: to give a supply to an existing two phase system from a three phase… Read more
Jun 12, 2012 | By jiguparmar
