ABB RED615 Technical Manual page 363

1YHT530004D05 D
615 series
Technical Manual
component can be selected for that winding by setting the Zro A elimination
parameter.
Winding selection setting defines the IED location respect to the transformer. If the
IED is situated at the HV side of the transformer, then IED location setting is set to
"Winding 1" and respectively to "Winding 2" if IED is situated at the LV side. If
the differential IEDs are used to protect a line without in-zone transformer, then the
setting is set to "Not in use". In this case vector group matching is ignored.
The matching of the phase difference is based on the phase shifting and the
numerical delta connection inside the IED. The Winding 1 type parameter
determines the connection on winding 1 ("Y", "YN", "D", "Z", "ZN"). The vector
group matching can be implemented either on both, winding 1 and winding 2, or
only on winding 1 or winding 2, at intervals of 30° with the Clock number setting.
Similarly, the Winding 2 type parameter determines the connections of the phase
windings on the low voltage side ("y", "yn", "d", "z", "zn").
When the vector group matching is Yy0 and the CT connection type is according to
"Type 2", the phase angle of the phase currents connected to the IED does not
change. When the vector group matching is Yy6, the phase currents are on one side
turned 180° in the IED.
Example 1, vector group matching of an YNd11-connected power transformer on
winding 1, CT connection type according to type 1. The Winding 1 type setting is
"YN", Winding 2 type is "d" and Clock number is "Clk Num 11". This is
compensated internally by giving winding 1 internal compensation value +30° and
winding 2 internal compensation value 0°:
− −
− −
I I
L 1 L 2
=
I
L mHV 1
3
GUID-7DD69356-3528-4161-AFD2-7807B133403D V1 EN
− −
−
− I I
L 2 L 3
=
I
L mHV 2
3
GUID-36A1CB86-4BE8-45BD-B9BE-76F417EB0700 V1 EN
− −
−
− I I
L 3 L 1
I =
L mHV 3
3
GUID-E215125D-50B4-4F0B-95B0-84D5C6519B2E V1 EN
Example 2, if vector group is Yd11 and CT connection type is according to type 1,
the compensation is a little different. The Winding 1 type setting is "Y", Winding 2
type is "d" and Clock number is "Clk Num 11". This is compensated internally by
giving winding 1 internal compensation value 0° and winding 2 internal
compensation value -30°:
Section 4
Protection functions
(Equation 33)
(Equation 34)
(Equation 35)
357