Siemens SIPROTEC 7SJ62 Manual page 112

Functions
2.3 Directional Overcurrent Protection 67, 67N
Before Version V4.60, the direction characteristic could only be set in three discrete positions. The settings that
correspond with the old parameters 1515 and 1615 are specified as follows.
Up to V4.60
Addr. 1515 / 1615
Inductive (135°)
Resistive (90°)
Capacitive (45°)
1)
Default Setting
Directional Orientation
The directional orientation can be changed for the directional phase elements under address 1516 67
Direction and for the directional ground element under address 1616 67N Direction. Directional over-
current protection normally operates in the direction of the protected object (line, transformer, etc.). If the pro-
tection device is properly connected in accordance with one of the circuit diagrams in Appendix A.3, this is the
„forward" direction.
Note
When the 67-1 element or the 67N-1 element picks up, the phase-specific directional messages „forward" or„
reverse" are generated (messages 2628 to 2636).
Pickup of the 67-2 element, 67N-2 element and 67-TOC element is done in the set direction range without di-
rection message.
Quantity Selection for Direction Determination for the Directional Ground Element
Parameter 1617 67N POLARIZAT. can be set to specify whether direction determination is accomplished
from the zero sequence quantities or ground quantities (with VN and IN) or from the negative sequence
quantities (with V2 and I2). The first option is the preferential setting, the latter is to be selected in case of
danger that the zero voltage be too small due to unfavourable zero impedance or that a parallel line influences
the zero system.
67-2 Directional High-set Element (phases)
The pickup and delay of element 67-2 are set at addresses 1502 and 1503. For setting, the same consider-
ations apply as did for the non-directional time overcurrent protection in Section 2.2.11.
The selected time is only an additional time delay and does not include the operating time (measuring time,
dropout time). The delay can be set to ∞. After pickup the element will then not trip. Pickup, however, will be
signaled. If the 67-2 element is not required at all, the pickup value 67-2 PICKUP should be set to ∞. For this
setting, there is neither a pickup signal generated nor a trip.
67N-2 Directional High-set Element (Ground)
The pickup and delay of element 67N-2 are set at addresses 1602 and 1603. The same considerations apply
for these settings as did for phase currents discussed earlier.
The selected time is only an additional time delay and does not include the operating time (measuring time,
dropout time). The delay can be set to ∞. After pickup the element will then not trip. Pickup, however, will be
signaled. If the 67N-2 element is not required at all, then the pickup value 67N-2 PICKUP should be set to ∞.
This setting prevents from tripping and the generation of a pickup message.
112
Directional Phase Elements Address
1519
1) 1)
45°
90°
135°
As of V4.60
Directional Phase Elements Address
1619
–45°
0°
45°
SIPROTEC, 7SJ62/64, Manual
C53000-G1140-C207-2, Release date 01.2008
1)