ABB RELION REX640 Technical Manual page 577

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1MRS759142 C

Technical Manual

Vector group of the

Winding 1 type

Zero-sequence component elimination

If Clock number is "Clk Num 2", "Clk Num 4", "Clk Num 8" or "Clk Num 10", the

vector group matching is always done on both, winding 1 and winding 2. The

combination results in the correct compensation. In this case the zero-sequence

component is always removed from both sides automatically. The Zro A elimination

parameter cannot change this.

If Clock number is "Clk Num 1", "Clk Num 5", "Clk Num 7" or "Clk Num 11", the

vector group matching is done on one side only. A possible zero-sequence component

of the phase currents at earth faults occurring outside the protection area is

automatically eliminated in the numerically implemented delta connection before the

differential current and the biasing current are calculated. This is why the vector group

matching is almost always made on the star connected side of the "Ynd" and "Dyn"

connected transformers.

If Clock number is "Clk Num 0" or "Clk Num 6", the zero-sequence component of the

phase currents is not eliminated automatically on either side. Therefore, the zero-

Winding 2 type

Protection functions

Zero sequence

current elimination

HV & LV side

HV & LV side

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