Thursday, 21 September 2017

Power Electronics Tech Scenario

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Silicon Carbide is the Wide Band Gap (WBG) semiconductor.[2- 4 eV]. Si has 1-2 eV. Silicon Carbide has arrived and world is waiting for ...
2 comments:
Sunday, 13 August 2017

What makes a motor energy efficient ( IE2 )

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Core Loss in motor :- hysteresis and Eddy current loss. Mainly in stator core ( as rotor core losses are @ slip freq.). To reduce this ...
3 comments:
Monday, 25 July 2016

SF6 properties

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Ever Wondered Whats so great about SF 6 ? 

More on Circuit Breakers

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Let us learn about Operating Duty of a CB Various components of circuit breaker take different operating time 
1 comment:
Wednesday, 20 July 2016

More on Circuit Breakers

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Some common problems encountered in CBs: Make                                     Problem ALIND................................. Chain ...

Circuit Breaker Maintenance

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Some ratings for knowledge: Spring charge motor   DC 220 V Coils  : Shunt Trip  110 V Dc                 Closing Coil   ...
Friday, 8 July 2016

Lets learn about Batteries

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Batteries have evolved over recent past, some types:   Other types as follows:  Shown above is 650 Ah VRLA battery.

Earthing

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I.E. Rules 61  :   substation and equipments I.E. Rules 67 : HV and EHV Maxm Res. : Large power stations   0.5 ohms Major Substations...

A note about slip test

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It is conducted to calculate unsaturated Xd and Xq. We feed subnormal voltage to armature, mechanically rotate  it, keep field open ( Vf) ...

MCQs on Electrical Engineering

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Q. The phase sequence of alternator wil reverse when  I(f) is reversed, keeping direction of rotation as same. I(f) remains same, direc...

More about Transformers

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The weakest link in the transformer is  Cellulose ! Condition of Cellulose depends upon Moisture, Temp and Oxygen. Due top weak Cellulo...

Lets Learn about Transformers

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Thursday, 18 June 2015

Distance Relays

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Reactance relays cant be made directional. A directional element cant be added to them since these relays operate under normal load condi...

Bundled conductors

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Advantages:- Reduced reactance.( L is reduced) Reduced voltage gradient.  Reduced corona losses. Reduced Radio intrerference. Redu...
Thursday, 14 May 2015

Buildings Fire safety

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IS 1646- 1982: This IS covers following points:  General Requirements Power Equipment Switchboards Power Distribution and Motor...

Symbols and connection diagrams of circuits

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Thursday, 16 April 2015

Insulation coordination

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Tuesday, 14 April 2015

Why we use output choke in bridge rectifier?

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Why we use capacitor bank in VFDs

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Thursday, 7 August 2014

Types of protection devices

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