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Energy and Power

## Protection of A.C. Electrified Railways

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# Author Archive for: Jignesh Parmar

## 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.

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… Read more

Mar 04, 2016 | By jiguparmar

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…. Read more

Aug 18, 2014 | By jiguparmar

Cables

# An example how to calculate voltage drop and size of electrical cable

Electrical load of 80KW, distance between source and load is 200 meters, system voltage 415V three phase, power factor is 0.8, permissible voltage drop is  5%, demand factor is 1…. Read more

Jun 30, 2014 | By jiguparmar

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… Read more

May 12, 2014 | By jiguparmar

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… Read more

Apr 25, 2014 | By jiguparmar

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… Read more

Mar 10, 2014 | By jiguparmar

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… Read more

Mar 03, 2014 | By jiguparmar

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… Read more

Dec 23, 2013 | By jiguparmar

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… Read more

Nov 29, 2013 | By jiguparmar

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… Read more

Nov 20, 2013 | By jiguparmar

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… Read more

Nov 15, 2013 | By jiguparmar

Electric Motor

# Sizing The DOL Motor Starter Parts (Contactor, Fuse, Circuit Breaker and Thermal Overload Relay)

Calculate size of each part of DOL motor starter for the system voltage 415V, 5HP three phase house hold application induction motor, code A, motor efficiency 80%, motor RPM 750,… Read more

Sep 11, 2013 | By jiguparmar

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 <… Read more

Sep 02, 2013 | By jiguparmar

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… Read more

Aug 28, 2013 | By jiguparmar

Electrical Lectures

# Electrical Thumb Rules You MUST Follow (1)

Cable Capacity Current Capacity of Equipment Earthing Resistance Minimum Bending Radius Insulation Resistance Lightning Arrestor Transformer Diesel Generator Current Transformer Quick Electrical Calculation For Cu Wire Current Capacity (Up to… Read more

Aug 23, 2013 | By jiguparmar

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