ABB RER670 - Page 157

IEC15000302-1-en.vsdx
Trafo 132/15kV
15kV132kV
U
V
V
2-phase to 1-phase interconnection
IEC15000302 V2 EN-US
IEC15000304-2-en.vsdx
Trafo 132/66kV
66kV132kV
U
V
V
U
2-phase to 2-phase interconnection
IEC15000304 V2 EN-US
Figure 44: Railway transformers connection examples
ZGTPDIS function can be used as primary protection as well as backup protection
for the transformer. It protects both HV and LV side of the transformer. The
protection is designed to operate for earth faults and phase faults in the transformer
and the associated lines.
Zone 1 can be used to provide high-speed protection for faults in the HV winding
of the transformer. Zone 2 can be used to cover the entire transformer and
substation LV busbar. Zone 3 can be used to cover power system faults beyond the
LV busbar.
Backup impedance protection characteristics
The characteristics of zone 1, zone 2 and zone 3 are shown in Figure
45. All zones
have either offset mho or non-directional quadrilateral characteristics with
adjustable reach in forward and reverse direction. Quadrilateral characteristics have
1MRK 506 375-UEN A Section 7
Impedance protection
Railway application RER670 2.2 IEC 151
Application manual