Zig-zag transformers. These transformers are 3-phase, dry-type autotransformers that are wound on a common core and are designed for very low zero-sequence impedance. The zero-sequence impedance is ...

The PowerSmith T-1000 zero sequence impedance transformer offers a practical solution to power quality issues. The symptoms of poor power quality are well known – equipment spontaneously resets, ...

The parameterization of a distance relay requires precise knowledge of the positive-sequence impedance Z1 and zero-sequence impedance Z0 of the line being protected. If, in addition to this, the ...