ABB RELION 620 Series Technical Manual page 491

1MRS757644 F
620 series
Technical Manual
GUID-FDF97C09-E155-422A-8CBC-CD8B3A19101E V1 EN
Figure 244: Operation in "Intermittent EF" mode, Peak counter limit = 3
Blocking logic
There are three operation modes in the blocking functionality. The operation modes
are controlled by the BLOCK input and the global setting Configuration/System/
Blocking mode which selects the blocking mode. The BLOCK input can be controlled
by a binary input, a horizontal communication input or an internal signal of the
protection relay's program. The influence of the BLOCK signal activation is
preselected with the global setting Blocking mode.
The Blocking mode setting has three blocking methods. In the "Freeze timers" mode,
the operation timer is frozen to the prevailing value. In the "Block all" mode, the whole
function is blocked and the timers are reset. In the "Block OPERATE output" mode,
the function operates normally but the OPERATE output is not activated.
Section 4
Protection functions
485