1 General
1.1 Scope
1.2 Classification
1.3 Normal service conditions
2 Normative references
3 Definitions
4 Ratings
4.1 Rated power at rated frequency and load capability
4.2 Rated and service voltages
4.3 Rated current
5 Load loss and voltage drop in transformers and reactors
5.1 Determination of transformer load loss under
distorted current loading
5.2 Effect of geometrical arrangement of windings on
their eddy current losses due to harmonics
5.3 Loss in interphase transformers, current-balancing
reactors, series-smoothing reactors and transducers
5.4 Voltage drops in transformers and reactors
6 Tests for convertor transformers
6.1 Measurement of commutating reactance and determination
of the inductive voltage drop
6.2 Measurement of voltage ratio and phase displacement
6.3 Load loss test
6.4 Temperature rise tests
Table 1 Connections and calculation factors
Annexes
A Determination of transformer service load loss at rated
non-sinusoidal convertor current from measurements with
rated transformer current of fundamental frequency
B Short-circuit test currents and load losses in transformers
for single-way convertors (total loss injection)
ZA Normative references to international publications with
their corresponding European publications
Figures
A.1 Cross-section of a winding strand
A.2 Terminal identification for winding connection Y yyO
A.3 Terminal identification for winding connection D d y