Vector group of the
transformer
Winding 1 type Winding 2 type Phase shift Zero sequence
current elimination
Zd8 Z d 8 Not needed
ZNd8 ZN d 8 (Automatic)
Zd10 Z d 10 Not needed
ZNd10 ZN d 10 (Automatic)
Zz0 Z z 0 Not needed
ZNz0 ZN z 0 HV side
ZNzn0 ZN zn 0 HV & LV side
Zzn0 Z zn 0 LV side
Zz2 Z z 2 Not needed
ZNz2 ZN z 2 (Automatic)
ZNzn2 ZN zn 2 (Automatic)
Zzn2 Z zn 2 (Automatic)
Zz4 Z z 4 Not needed
ZNz4 ZN z 4 (Automatic)
ZNzn4 ZN zn 4 (Automatic)
Zzn4 Z zn 4 (Automatic)
Zz6 Z z 6 Not needed
ZNz6 ZN z 6 HV side
ZNzn6 ZN zn 6 HV & LV side
Zzn6 Z zn 6 LV side
Zz8 Z z 8 Not needed
ZNz8 ZN z 8 (Automatic)
ZNzn8 ZN zn 8 (Automatic)
Zzn8 Z zn 8 (Automatic)
Zz10 Z z 10 Not needed
ZNz10 ZN z 10 (Automatic)
ZNzn10 ZN zn 10 (Automatic)
Zzn10 Z zn 10 (Automatic)
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
1YHT530004D05 D Section 4
Protection functions
615 series 361
Technical Manual
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