Schweitzer Engineering Laboratories SEL-311L Instruction Manual page 169

For example, if setting:
ORDER = QV
then the first listed directional element (Q = negative-sequence voltage-polarized directional
element; see Figure 4.9) is the first priority directional element to provide directional control for
the ground distance and residual ground overcurrent elements.
If the negative-sequence voltage-polarized directional element is not operable (i.e., it does not
have sufficient operating quantity as indicated by its internal enable, 32QGE, not being asserted),
then the second listed directional element (V = zero-sequence voltage-polarized directional
element; see Figure 4.10) provides directional control for the ground distance and residual ground
overcurrent elements.
Another example, if setting:
ORDER = V
then the zero-sequence voltage-polarized directional element (V = zero-sequence voltage-
polarized directional element; see Figure 4.10) provides directional control for the ground
distance and residual ground overcurrent elements all the time.
Setting ORDER can be set with any element combination (e.g., ORDER = IQV, ORDER = QVI,
ORDER = IV, ORDER = VQ, ORDER = I, ORDER = Q).
Note: If ground quadrilateral distance elements are used, the first entry in the ORDER setting
should be as shown below:
Z2F—Forward Directional Z2 Threshold
Z2R—Reverse Directional Z2 Threshold
Setting Range:
-64.00 to 64.00
-320.00 to 320.00
Z2F and Z2R are used to calculate the Forward and Reverse Thresholds, respectively, for the
negative-sequence voltage-polarized directional elements (see Figure 4.9 and Figure 4.14).
If configuration setting E32 = Y, settings Z2F and Z2R (negative-sequence impedance values) are
calculated by the user and entered by the user, but setting Z2R must be greater in value than
setting Z2F by 0.1
Date Code 20010625
Setting XGPOL
IG
I2
secondary (5 A nominal phase current inputs, IA, IB, IC)
V
secondary (1 A nominal phase current inputs, IA, IB, IC)
V
(5A nominal) or 0.5
V
Loss-of-Potential, CCVT Transient Detection,
Load-Encroachment, and Directional Element Logic
SEL-311L Instruction Manual
First Element of ORDER
Q or V
Q
(1A nominal).
V
4-23