What is the application of Dyn1 and Dyn11 vector group of transformer?

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what is potentiometer & rheostat

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why are the likely reasons for bochholz & pressure relays oprate due to a internal fault but not differential relay ?

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Installation method of self treated earth electrode.

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why transmission voltages are in multiple of 11kv?

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how we decide wire gauge for ac or dc coil and what is the basic diff. B/w these two coil?

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the inertia constants of two machines are respectively 30and 42 MJ per MVA.when the change in frequency due to change in load in first machine is 12 Hz,the change in second machine frequency will be?

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What is relation between mu(nought) and epsilon(nought)?

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If oil and air can withstand a high MeV when used as an insulator in a transformer, what are the values of how high for each material?

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"What is the difference between voltage and potential differnce?"

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we have one pumping station and 4.6 MW 7 no.s synchronous motors.so there is no required HT capacitor to improve power factor.But we have two no.s of 25 Mva power transformer connect to distribute the power for motors connect with 220 kv line.So i have required the HT capacitor to improve power factor at HT side i mean power transformer bus side.So please suggest how much HT capacitor banks required for same.

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What is quadrantal symmetry?

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