ABB 615 series Technical Manual page 349

1MAC059074-MB A
615 series ANSI
Technical Manual
The calculated Iosin(φ) or Iocos(φ) current used in direction determination can be read
through the I_OPER monitored data. The value can be passed directly to a decisive
element, which provides the final pickup and trip signals.
The I_OPER monitored data gives an absolute value of the calculated
current.
The following examples show the characteristics of the different operation criteria:
Example 1.
Iosin(φ) criterion selected, forward-type fault
=> FAULT_DIR = 1
Correction
angle
IG

= -90 deg
RCA
IGsin
Forward
tripping zone
GUID-BC040813-ECB4-4D8C-9329-6CA29EE239C7 V1 EN
Figure 159: Operating characteristic Iosin(φ) in forward fault
The operating sector is limited by angle correction, that is, the operating sector is 180
degrees - 2*(angle correction).
Example 2.
Iosin(φ) criterion selected, reverse-type fault
=> FAULT_DIR = 2
-VG
Backward
tripping zone
Min operating
current
Section 4
Protection functions
343