Answer Posted / srikrishna kumar

the operation of the relays depended upon the magnitude of
current or power in the protected circuit. however,there is
another group of relays in which the operation is governed
by the ratio of applied voltage to current in the protected
circuit. such relays are called distance or impedance
relays. in an impedance relay, the torque produced by a
current element is opposed by the torque produced by a
voltage element. the relay will operate when the ratio V/I
is less than a predetermined value.

specify the inbuilt protections in DG

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how many safety really of DG sets.

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I don't understand why when we connect high voltage source in DC to electronic motor , we must add capacitor and resistor in parallel ? (I know that we use capacitor because we want to absorb the current that in the first second electronic motor in opposed with current course produce. ) what are the feature of Resistor and in such situation ?

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Define newton's law of viscosity.

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