Jignesh Parmar
74 awesome technical articles
Electrical Middle management professional having more than 22 years rich and dynamic experience in Project Execution / Project Management / Designing / Maintenance diversifies from Electrical Power Transmission (400KV/220KV/66KV)- Distribution(11KV/220V) to Lifts-HVAC-Ventilation-Fire Fighting-Fire Alarm-Lifts-CCTV-Stack Parking Works (High Rise Buildings, Townships, Shopping Complex, Commercial Complex, School, Temple).
Biography: https://electrical-engineering-portal.com/jignesh-parmar
Power Substation
Defining size and location of capacitor in electrical system (1)
Type of Capacitor Bank as per Its Application: Fixed type capacitor banks Automatic type capacitor banks Types of APFC – Automatic Power Factor Correction Type of Capacitor as per Construction Selecting Size of Capacitor Bank Selection of Capacitor as per… Read more
Mar 04, 2016 | By Jignesh Parmar
Energy Efficiency
An example of calculating the number of indoor lighting fixtures
These are the input data for the following calculation: An office area has length: 20 meter; width: 10 meter; height: 3 meter. The ceiling to desk height is 2 meters. The area is to be illuminated to a general level… Read more
Aug 18, 2014 | By Jignesh Parmar
Cables
An example how to calculate voltage drop and size of electrical cable
According to the National Electrical Code, in order for general use circuits to operate reasonably efficiently, the maximum voltage drop for branch circuit conductors is 3% and for feeder and branch circuit conductors combined it is 5%. When designing circuits… Read more
Jun 30, 2014 | By Jignesh Parmar
Maintenance
An example of calculating transformer size and voltage drop due to starting of large motor
Let’s calculate voltage drop in transformer 1000KVA, 11/0.480 kV, impedance 5.75% due to starting of 300 kW, 460V, 0.8 power factor, motor code D (kva/hp). Motor starts 2 times per hour and the allowable voltage drop at transformer secondary terminal is… Read more
May 12, 2014 | By Jignesh Parmar
High Voltage
An example of calculating the technical losses of T&D lines
There are two types of losses in transmission and distribution line. Technical Losses and Commercial Losses. It’s necessary to calculate technical and commercial losses. Normally technical losses and commercial losses are calculated separately. Technical losses of the distribution line mostly… Read more
Apr 25, 2014 | By Jignesh Parmar
Energy and Power
Electrical Thumb Rules You MUST Follow (8)
Accuracy Class of Metering CT Accuracy Class Letter of CT Accuracy Class of Protection CT Continued from part 7: Electrical Thumb Rules You MUST Follow (Part 7) Metering Class CT Class Applications 0.1 To 0.2 Precision measurements 0.5 High grade… Read more
Mar 10, 2014 | By Jignesh Parmar
Energy and Power
Total Losses in Power Distribution and Transmission Lines (2)
Continued from first part: Total Losses in Power Distribution & Transmission Lines (1) There are two types of transmission and distribution losses: Technical losses (explained in previous part) Non-technical losses (commercial losses) Non-technical losses are at 16.6%, and related to… Read more
Mar 03, 2014 | By Jignesh Parmar
Energy and Power
Electrical Thumb Rules You MUST Follow (7)
Continued from: Electrical Thumb Rules You MUST Follow (Part 6) Overhead conductor / cable size Transmission / distribution line (span, height of tower) Types of towers Tower swing angle clearance (metal part to live part) Cable coding, IS 1554 (A2XFY, FRLS,… Read more
Dec 23, 2013 | By Jignesh Parmar
Energy and Power
Electrical Thumb Rules You MUST Follow (6)
Continued from: Electrical Thumb Rules You MUST Follow (Part 5) Transformer earthing wire / Strip size Motor earthing wire / Strip size Panel earthing wire / Strip size Electrical equipment earthing Earthing wire (As per BS 7671) Area for transformer room:… Read more
Nov 29, 2013 | By Jignesh Parmar
Energy and Power
Electrical Thumb Rules You MUST Follow (5)
Continued from: Electrical Thumb Rules You MUST Follow (Part 4) Standard Size of Transformer (IEEE/ANSI 57.120) Standard Size of Motor (HP) Approximate RPM of Motor Motor Line Voltage Motor Starting Current Motor Starter Impedance of Transformer (As per IS 2026)… Read more
Nov 20, 2013 | By Jignesh Parmar
Energy and Power
Electrical Thumb Rules You MUST Follow (4)
Continued from: Electrical Thumb Rules You MUST Follow (Part 3) Substation Capacity and Short Circuit Current Capacity (As per GERC) Substation Capacity and Short Circuit Current Capacity (As per Central Electricity Authority) Minimum Ground Clearance and Fault Clearing Time Busbar… Read more
Nov 15, 2013 | By Jignesh Parmar
Electric Motor
Sizing The DOL Motor Starter Parts (Contactor, Fuse, Circuit Breaker and Thermal Overload Relay)
In this technical article we’ll calculate the size of each part of DOL motor starter for the system voltage 415V, 5HP three phase household application induction motor, code A, motor efficiency 80%, motor RPM 750, power factor 0.8 and overload… Read more
Sep 11, 2013 | By Jignesh Parmar
Electrical Lectures
Electrical Thumb Rules You MUST Follow (3)
Continued from second part: Electrical Thumb Rules You MUST Follow (Part 2) For Motor Size of Capacitor = 1/3 Hp of Motor ( 0.12x KW of Motor) For Transformer < 315 KVA 5% of KVA Rating 315 KVA to 1000… Read more
Sep 02, 2013 | By Jignesh Parmar
Electrical Lectures
Electrical Thumb Rules You MUST Follow (2)
Continued from first part: Electrical Thumb Rules You MUST Follow (Part 1) For Sinusoidal Current: Form Factor = RMS Value/Average Value = 1.11 For Sinusoidal Current: Peak Factor = Max Value/RMS Value = 1.414 Average Value of Sinusoidal Current (Iav)… Read more
Aug 28, 2013 | By Jignesh Parmar
Electrical Lectures
Electrical Thumb Rules You MUST Follow (1)
This technical article deals with the electrical thumb rules related to cable capacity, current capacity of equipment, earthing resistance, minimum bending radius of a cable, insulation resistance, transformer and lightning arrestor parameters, diesel generator, and current transformer (CT). Cable Capacity… Read more
Aug 23, 2013 | By Jignesh Parmar
