Dry Cell Transformer

Dry Cell Transformer

Product Introduction: The percent impedance is the percent voltage required to circulate rated current flow through one transformer winding when another winding is short-circuited at the rated voltage tap at rated frequency. For a two winding transformer with a 5% impedance, it would require 5%...

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Product Introduction:

The percent impedance is the percent voltage required to circulate rated current flow through one transformer winding when another winding is short-circuited at the rated voltage tap at rated frequency.

For a two winding transformer with a 5% impedance, it would require 5% input voltage applied on the high voltage winding to draw 100% rated current on the secondary winding when the secondary winding is short-circuited.

If 100% rated voltage is applied to the high voltage winding, approximately 20X rated current would flow in the secondary winding when the secondary winding is short-circuited.

Impedance Levels:

Based kVAMinimum Impedance, %
0 – 150Manufacturer’s standard
151 – 3004
301 – 6005
601 – 2,5006
2,501 – 5,0006.5
5,001 – 7,5007.5
7,501 – 10,0008.5
Above 10,0009.5

Important Notes:

  1. The impedance of a two-winding transformer shall not vary from the guaranteed value by more that ± 7.5%

  2. The impedance of a transformer having three or more windings or having zig-zag windings shall not vary from the guaranteed value by more than ± 10%

  3. The impedance of an auto-transformer shall not vary from the guaranteed value by more than ± 10%

  4. The difference of impedance between transformers of the same design shall not exceed 10% of the guaranteed values

  5. Differences of impedance between auto-transformers of the same design shall not exceed 10% of the guaranteed values

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