Electrical Engineering ⇒ Topic : Rise of Current in an inductive circuit
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Gaurav
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RISE OF CURRENT IN AN INDUCTIVE CIRCUIT Let i = current at any instant, Im = maximum steady value of current (= V/R), R = resistance, L = inductance, and λ= time constant of the circuit (= L/R) Then, important relations are: (a) Rise of Current
fig (a) fig (b) Hence the time constant X of an R-L circuit may be defined as the time during which the current actually rises to 0.632 of its maximum steady value Fig.(b): The delayed rise of çurrent in an inductive circuit is utilized in providing time lag in operation of electric relays and trip coils etc. (b) Decay of Current Putting t = λ in eqn. (2), we get Hence time constant (X) of an R-L circuit may be defined as the time during which current falls 0.37 or 37% of its maximum steady value while decaying Fig.(b) Fig.(b) Decay of current in an R-L circuit | |
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