ABB RELION 620 Series Technical Manual page 689

1MRS757644 F
4.5.8.7
620 series
Technical Manual
GUID-78B05F4B-3434-4DD5-89F6-17F099444C04 V1 EN
Figure 346: Operating curve of "OvExt IDMT Crv4" based on the specified
settings. The two dots marked on the curve are referred to in the text.
If the excitation level stays at 1.25, the operation occurs after 15200 milliseconds. At
the excitation level of 1.42, the time to operation would be 5900 milliseconds as per
the two dots in Figure 346. In this case, the setting Maximum operate time = 3600000
milliseconds does not limit the maximum operate time because the operate time at
Start value = 110% (1.1 pu) is approximately 75000 milliseconds.
Signals
Table 640: OEPVPH Input signals
Name Type
I_A SIGNAL
I_B SIGNAL
I_C SIGNAL
I SIGNAL
1
U_A_AB SIGNAL
U_B_BC SIGNAL
U_C_CA SIGNAL
Table continues on next page
Protection functions
Default Description
0 Phase A current
0 Phase B current
0 Phase C current
0 Positive-phase sequence current
0 Phase-to-earth voltage A or phase-to-phase
voltage AB
0 Phase-to-earth voltage B or phase-to-phase
voltage BC
0 Phase-to-earth voltage C or phase-to-phase
voltage CA
Section 4
683