# Archive: Category «Maintenance»

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# 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 | jiguparmar

# Electrical Preventive Maintenance of Air Circuit Breakers

Remove and clean interphase barriers. Clean all insulating materials with vacuum and/or clean lint free rags. If it is necessary to use cleaning solvents, use only solvents recommended by the… Read more

Feb 07, 2014 | Edvard

# Guidelines For The Construction And Maintenance Of Transmission Lines

Nov 13, 2013 | Edvard

# Defining Size and Location of Capacitor in Electrical System (2)

Continued from part 1: Defining Size and Location of Capacitor in Electrical System (2) Size of circuit breaker (CB), fuse and conductor of capacitor bank: A. Thermal and magnetic setting… Read more

Mar 11, 2013 | jiguparmar

# How to Predict Life Span of the Switchgear?

The life span of switchgear basically depends on the size of the load and the number of switching cycles. Instead of a time span, with electromechanical switchgear reference is usually… Read more

Nov 28, 2012 | Edvard

# How to Maximize Chiller Efficiency?

Chillers are the single largest energy-using component in most facilities, and can typically consume over 50% of the electrical usage. Chillers use approximately 20% of the total electrical power generated… Read more

Sep 04, 2012 | Edvard

# 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 | jiguparmar

# 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

# Inspection of electrical installations in home (2)

Continued from part I – Inspection of electrical installations in home (part 1) Every installation deteriorates with use and age. Therefore, one must ensure that the safety of users is… Read more

Mar 26, 2012 | Edvard

# Inspection of electrical installations in home (1)

Europe has an ageing housing stock. There are many homes with outdated wiring. This wiring is deteriorating, has been inappropriately amended, or is insufficient for the electrical loads of today’s… Read more

Mar 24, 2012 | Edvard

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