The snubber circuit used to shape the turn-on switching trajectory of thyristor and/or to limit di/dt during turn on is

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ESE Electrical 2014 Paper 2: Official Paper
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  1. L - R snubber polarized
  2. R - C snubber polarized
  3. R - C snubber unpolarized
  4. L - R snubber unpolarized

Answer (Detailed Solution Below)

Option 1 : L - R snubber polarized
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Detailed Solution

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The different types of Snubber circuits are given below:

1. Unpolarized series R-C snubbers: Used to protect diodes and thyristors

2. Polarized R-C snubbers:

  • Used as turn-off snubbers to shape the turn-off switching trajectory of controlled switches
  • Used as overvoltage snubbers to clamp voltages applied to controlled switches to safe values
  • Limit dv/dt during device turn-off

3. Polarized L-R snubbers:

  • Used as turn-on snubbers to shape the turn-on switching trajectory of controlled switches.
  • Limit di/dt during device turn-on
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