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Inductive Transients

Inductive Transients. Introduction. Inductor Voltage. Immediately after the switch is closed, the current is still zero, (since it cannot change instantaneously). Example. E=20 V, Determine i , and V L at the instant switch is closed. Current Buildup Transients. Applying KVL:.

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Inductive Transients

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  1. Inductive Transients

  2. Introduction

  3. Inductor Voltage • Immediately after the switch is closed, the current is still zero, (since it cannot change instantaneously).

  4. Example • E=20 V, Determine i, and VL at the instant switch is closed.

  5. Current Buildup Transients • Applying KVL:

  6. Circuit Voltages

  7. Example • E=50 V, R= 10 ohm, L= 2H

  8. Example • VL for above example:

  9. Time Constant

  10. Interrupting current in an inductive circuit

  11. Interrupting via Resistor

  12. Inductor Equivalent at Switching

  13. De-energizing Transients KVL: VL+ VR1+VR2=0

  14. Example • Assume steady state for circuit. E=120 V, R1=30 ohm, R2=600 ohm, L=126 m H

  15. Voltages

  16. Example

  17. Solution

  18. Solution

  19. Solution

  20. Solution

  21. Reading Assignment • Section 14.5, Robbins and Miller’s Book

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