How does "OUT OF STEP" relay ,for Synchronous motor protection, work?

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I find that underground strip-armoiured,4core,LT PVC cables in an earthed power distribution sytem are occasionly found in charred condition-with no trace of it except ash. Is this because of no proper earth connection/continuity (giving rising to high armour resistance)in the joint enroute or because of insufficient capability (again due to high armour resistance)of cable-armour to carry fault current or due to neglected /unprotected overloading of the cable or due to high armour currents caused by power thefts where only phase(s) are unauthorisely tapped & at the point of poer consumption earth terminal is established by burring underground a not so good earthing rod (or using an underground water pipe for the purpose)

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If a surge divertor is required to be protected by 32 amp C Curve Circuit breaker does this limit the amount of protection from surges that you will acheive

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what is the difference b/w earthing and grounding??

2 Answers   Dodsal,

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how to calculate the cable size in sqmm if load (kw) is given?

5 Answers  

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Hello sir i m student of gtu .what is idp.

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Types of test in Switchgears, MCC, NGR and DB's how it should be procced. Can anyone give me the details here or email me to pasuvaraj.k@gmail.com

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why in dc generator field rheostate kept in maximum position?

1 Answers  

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11 KV distribution system where neutral is produced ?

4 Answers   ciss, TATA, Tata Motors,

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What are the difference between normal application Transformer and Solar application Transformer?

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why d.c produces corrosion

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What is sinusodial & non sinsodial current

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