in the directional overcurrent and earthfault protection,normally we are setting the angle 45 deg lead for phase fault overcurrent and -45 deg lead for earthfault fro forward direction.but both the fault are operating on the same angle region only.why?how the relay will response?

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i have seen a picture of a power plant. in that pic. i saw chimney like giant structure which were spreading smoke like something...i want to know is it chimney or cooling towers, as my friends use to say.

2 Answers  

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What is the difference between Surge protection device and Lighting arrester?

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What is class 2 coordination ?

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What happens when the polarity changes in CT? Explain briefly?

8 Answers  

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what is dead tank CT AND what is live tank CT

2 Answers   TATA,

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How many earthings are provided for a 250KVA distribution transformer?

9 Answers  

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how one can check the Current of a DC 12 V battery ? Procedure. I told that take a thick wire (having more wires in it) and then join the + and - terminals of battery with the help of two ends of a thick wire .... is this correct or wrong .....

1 Answers  

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Why DC exitation to AC Generator? Why not AC?

2 Answers   Equate,

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what is the size of cable for 15kw motor and 85 meter cable length using with vfd

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What is SFU why it is used

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How to decide no. of Step and Kvar for APFC Panel 40 kvar MD: 33.12 KVA Avg pf : 0.8540

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