ABB Relion 620 Series - Page 402

Figure 196: Configurable operating sectors in phase angle characteristic
Table 408: Momentary operating direction
Fault direction The value for DIRECTION
Angle between the polarizing and operating
quantity is not in any of the defined sectors.
0 = unknown
Angle between the polarizing and operating
quantity is in the forward sector.
1= forward
Angle between the polarizing and operating
quantity is in the reverse sector.
2 = backward
Angle between the polarizing and operating
quantity is in both the forward and the re-
verse sectors, that is, the sectors are over-
lapping.
3 = both
If the Allow Non Dir setting is "False", the directional operation (forward, reverse)
is not allowed when the measured polarizing or operating quantities are invalid,
that is, their magnitude is below the set minimum values. The minimum values
can be defined with the settings Min operate current and Min operate voltage .
In case of low magnitudes, the FAULT_DIR and DIRECTION outputs are set to
0 = unknown, except when the Allow non dir setting is "True". In that case, the
function is allowed to operate in the directional mode as non-directional, since the
directional information is invalid.
Protection functions
1MRS757644 H
402 620 series
Technical Manual