Page 120 - Louth Transformer Catalogue

LT DATA

EFFECT OF WIDE RANGE OF PRIMARY TAPS ON PHYSICAL SIZE

0..................................................380V..................................................550V PLUS 18%
0..................................................110V..................................................240V PLUS 25%
0..................................................220V..................................................440V PLUS 25%
0...............................110V..............................220V...............................550V PLUS 40%
0...............................220V..............................400V...............................550V PLUS 30%
This table is a guide for tapped primary windings. It may not apply to Series/Parallel type windings.

EARTHING
Class 1 - Has provision for earthing.
Class - Has no provision for earthing.

INSULATION CLASS

Y = 90°C F = 155°C
A = 105°C H = 180°C
E = 120°C H+ = 200°C
B = 130°C C = 220°C

IMPEDANCE VOLTAGE

The impedance voltage of a winding is the voltage required, with other windings short circuited, to produce in that
winding under test the full load current that it was designed for. This figure is usually expressed as a percentage of
the total winding voltage.

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