Overview

Technical specifications

A converter must always be connected to the supply via a commutating inductance. This must be at least 4 % uk! The commutating inductance can be implemented as a converter transformer or, with appropriate mains voltage, as a commutating reactor. A supply can be regarded as “constant” when the output ratio P_s/S_k ≤ 0.01. Even in the case of a constant supply, the commutating reactor must have a uk of at least 4 % !

For high-power converters, the supply reactance, i.e. the total short-circuit power of the supply must be taken into account, which also results in a larger uk value. The recommended ratio of supply short-circuit power to apparent drive power is > 33:1.

The commutating reactors are dimensioned for the rated motor current in the armature or field circuit.

Operation on a 50 Hz and 60 Hz supply

The rated currents I_Ln specified in the Table for the reactors apply for operation at a supply frequency f = 50 Hz. Operation of the reactors at a supply frequency f = 60 Hz is permissible. In this case, the permissible rated current I_Ln is reduced to 90 %.

I_Ln (60 Hz) = 0.9 · I_Ln (50 Hz)

At the same time, the voltage drop DU increases by 8 %.