ABB RELION REX640 Technical Manual page 655

1MRS759142 F
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
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
Similarly, the
windings on the low voltage side ("y", "yn", "d", "z", "zn").
When the vector group matching is Yy0 and the
"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,
"YN",
internally by giving winding 1 internal compensation value +30° and winding 2
internal compensation value 0°:
−
I
L mHV 1
−
I
L mHV 2
−
I
3
L mHV
Example 2, if vector group is Yd11 and
compensation is a little different. The
is "d" and
winding 1 internal compensation value 0° and winding 2 internal compensation value
-30°:
−
I
L mLV 1
REX640
Technical Manual
Winding 2 type parameter determines the connections of the phase
CT connection type according to type 1. The Winding 1 type setting is
Winding 2 type is "d" and Clock number is "Clk Num 11". This is compensated
− −
I I
−
L 1 L 2
=
3
− −
I I
−
L 2 L 3
=
3
− −
I I
−
L 3 L 1
=
3
Clock number is "Clk Num 11". This is compensated internally by giving
− −
I I
−
L 1 L 3
=
3
CT connection type is according to
CT connection type is according to type 1, the
Winding 1 type setting is "Y", Winding 2 type
Protection functions
Winding 1 type
Clock number setting.
(Equation 146)
(Equation 147)
(Equation 148)
(Equation 149)
655