what is threshold voltage for a relay???what does it exactly means ?whats its value in our indian transmission system say 11kv feeder RMU relay

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1. which type of transformer connection is preferred in case of power supply transformers? (A) Star/Star (B) Delta/Delta (C) Star/Delta (D) Zig Zag/Star 2. In a power transformer usuall which winding is closer to the core? (A) Primary winding (B) Secondary winding (C) Low Voltage winding (D) High Voltage winding 3. The power factor of a purely inductive load is (A) Zero (B) Lagging (C) Leading (D) Unity.

9 Answers   CECRI_Central_Electrical_Research_Institute,

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what are the Alarm, Trip & Safety equipment (Issues) present in Power Transformers pls Mail it to ashokbabunhce@gmail.com

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while doing the excitation current test on power transformer what is the value of voltage to be applied? Nomonal rated voltage or 10% of rated voltage? Is it necessary to apply on high voltage side?

1 Answers   ACC,

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generally in LT and MV motors we are using 3.5Coresx16,25,35,50 etc cable for supply.although motors is earthed at two point and having all protection.then why we are using that 1/2 core for earthing the motors.while in HT cable we are using only 3core cable for motor supply.generally lt and mv motors are delta connected and ht motors having star connection.whethere it is having any relation with winding connection( star or delta).all motors i am talking about are dol only.can anybody solve my confusion.thanks...

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Can 4pole (3 phase+neautral )RCCB proper functioning in only 3 phase load (no neautral, no Earth) ?

0 Answers   HCL, Reliance,

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How can we calculate the KVA rating of a Distribution transformer from its core details?

0 Answers   ABB,

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what do you mean by earth fault in transformer?

2 Answers   L&T, UPL,

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What happen if 200KVAR capacitor continuesly connected to load and all the plant machinaries are not in working?

4 Answers  

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How to calculate Temp from Resister from PT100 equation,

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how a vibration switch's high signal will going to trip the motor? can u explain with some examplesand wiring diagrams?

1 Answers   Bhel, Wartsila,

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What is the formula for calculating the Instantaneous Short Circuit & overcurrent for any breaker

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