W, TA, ZA – Static shield windings, Tropics resistant, Additional tapping



Technical notes

Selection of correct tapping for single-phase transformers

  • selected transformer STEZ0,25(400/24)
  • required voltage of the additional tapping 22 V

The current for the selection of the tapping is calculated as follows:

  • I = S/U
  • I = current
  • S = apparent output
  • U = voltage of the tapping
  • I = 250/22) = 11,4 A = +ZA16

For the secondary tapping, the correct type affix reads: +ZA16S(22)

Additional primary tapping is determined in the same manner.

Selection of correct tapping for three-phase transformers

  • selected transformer DTZ0,25(400/24)
  • required voltage of the additional tapping 22 V

The current for the selection of the tapping is calculated as follows:

  • I = S/√3 x U
  • I = current
  • S = apparent output
  • U = voltage of the tapping
  • I = 250/(√3 x 22) = 6,6 A = +DZA16

For the secondary tapping, the correct type affix reads: +DZA16S(22).

Additional primary tapping is determined in the same manner.

Suitable forOutput kVATypePrice per unit (old) EuroPrice per unit Euro
Static shield windingPrice on requestPrice on request
for single-phase transformers
0,03–2,0+W1,8
2,5–4,0+W4,0
5,0–13,0+W6,0
16,0–25,0+W20,0
for three-phase transformers
0,1–6,3+W6,0
8,0–20,0+W20,0
25,0–100,0+W163,0
Tropics resistant (Additional finish after impregnation with tropic resistant finish)
0,03–0,2+TA0,2
0,25–1,3+TA1,4
1,6–4,0+TA4,0

Larger types on request

Suitable forOutput ATypePrice per unit (old) EuroPrice per unit EuroTypePrice per unit (old) EuroPrice per unit Euro
Additional tappingPrice on requestPrice on requestPrice on requestPrice on request
for single-phase transformers
< 16+ZA16P(*)+ZA16S(*)
16–25+ZA25P(*)+ZA25S(*)
25–63+ZA63P(*)+ZA63S(*)
63–100+ZA100P(*)+ZA100S(*)
100–200+ZA200P(*)+ZA200S(*)
200–320+ZA320P(*)+ZA320S(*)
400–630+ZA630P(*)+ZA630S(*)
for three-phase transformers
< 16+DZA16P(*)+DZA16S(*)
16-25+DZA25P(*)+DZA25S(*)
25-63+DZA63P(*)+DZA63S(*)
63-100+DZA100P(*)+DZA100S(*)
100-200+DZA200P(*)+DZA200S(*)
200-320+DZA320P(*)+DZA320S(*)
400-630+DZA630P(*)+DZA630S(*)