ABB Relion 615 series - Page 16

RET615
Std. conf.
ANSI IEC
49T
50L/50NL
50P/51P
51P/51N
87NH
87T
3Ith>T
ARC
3I>>>
3I/Io
dIoHi>
3dI>T
D
3I (LV)
RTD
3I (HV)
R
L
ClearESC
I
O
U12 0. 0 kV
P 0.00 kW
Q 0.00 kVAr
IL2 0 A
A
Io (LV)
GUID-46A1FCF8-F2EC-4737-9EA8-636E4AEF84FC V1 EN
Figure 10. Protection of a two-winding power transformer with RET615 standard configuration D
Figure 10 illustrates the protection of a two-winding power
transformer with RET615 standard configuration D. The main
protection used in this application example is transformer
differential protection. Additionally, restricted earth-fault
protection with high-impedance principle is applied on the
transformer's LV side.
3U Uo
3I (LV)
RTD
3I (HV)
Io (HV)
R
L
ClearESC
I
O
U12 0. 0 kV
P 0.00 kW
Q 0.00 kVAr
IL2 0 A
A
RET615
Std. conf.
ANSI IEC
27/59
49T
50L/50NL
50P/51P
51P/51N
59G
87NL
87T
3U</3U>
3Ith>T
ARC
3I>>>
3I/Io
Uo>
dIoLo>
3dI>T
E
GUID-3C760FFC-6D6B-4860-A198-4BA4273B32D9 V1 EN
Figure 11. Protection of a two-winding power transformer with RET615 standard configuration E
Figure 11 illustrates the protection of a two-winding power
transformer with RET615 standard configuration E. The main
protection used in this application example is transformer
differential protection. Additionally, restricted earth-fault
protection with numerical low-impedance principle and voltage
based protection are applied on the transformer's HV side.
Transformer Protection and Control
1MRS756891 M
RET615
Product version: 5.0 FP1
16 ABB