ABB RELION REX640 Technical Manual page 573

1MRS759142 C
REX640
Technical Manual
component can be selected for that winding by setting the Zro A elimination
parameter.
Winding selection setting defines the protection relay location respect to the
transformer. If the protection relay is situated at the HV side of the transformer, then
protection relay location setting is set to "Winding 1" and respectively to "Winding 2"
if protection relay is situated at the LV side. If the differential protection relays 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 protection relay. 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 protection relay does
not change. When the vector group matching is Yy6, the phase currents are on one side
turned 180° in the protection relay.
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-9BDC2FE6-9B44-4982-B8E9-F73D916DFD4F V1 EN
− −
I I
−
L 2 − L 3
I
L mHV 2 =
3
GUID-725BD440-C15B-44DD-9298-A26DFAC16F73 V1 EN
− −
I I
−
L 3 − L 1
I
L mHV 3 =
3
GUID-7B823A48-B24A-4CAF-B190-BCEFEA5F448E 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°:
− −
I I
−
L − L
1 3
I
L mLV 1 =
3
GUID-2E8290B6-6E8C-44C7-B82F-103A877433C9 V1 EN
Section 4
Protection functions
(Equation 92)
(Equation 93)
(Equation 94)
(Equation 95)
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