ABB RELION 615 Series Product Manual page 17

Transformer Protection and Control
RET615
Product version: 5.0 FP1
GUID-AB31C909-F38E-4885-AFEE-E2EEE3675263 V4 EN
Figure 12. Protection of a two-winding power transformer with RET615 standard configuration E
Figure 12 illustrates the protection of a two-winding power
transformer with RET615 standard configuration. The main
protection used in this application example is transformer
differential protection. Restricted earth-fault protection with
numerical low-impedance principle is applied on the
ABB
3U Uo
A
U12 0. 0 kV
P 0.00 kW
3I (HV) Q 0.00 kVAr
IL2 0 A
I
ESC Clear
O R
L
Io (HV)
RTD
3U
3I (LV)
transformer's HV side. The RTD inputs of RET615 are utilized
for monitoring the oil temperature and oil level of the
transformer. Additionally, REU615 with the standard
configuration B is used as automatic voltage regulator for the
on-load tap changer of the transformer.
RET615
Std. conf. E
ANSI IEC
27/59 3U</3U>
49T 3Ith>T
50L/50NL ARC
50P/51P 3I>>>
51P/51N 3I/Io
87NL dIoLo>
87T 3dI>T
A
REU615
U12 0. 0 kV
P 0.00 kW
Q 0.00 kVAr
IL2 0 A
I
ESC Clear
Std. conf. B
O R
L
ANSI IEC
27/59 3U</3U>
50P/51P 3I>>>
51P/51N 3I/Io
84M TPOSM
90V COLTC
1MRS756891 M
17