Date Code 20011205
Loss-of-Potential, CCVT Transient Detection,
4-23
Load-Encroachment, and Directional Element Logic
SEL-311B Instruction Manual
Once these settings are calculated automatically, they can only be modified if the user goes back
and changes the directional control enable setting to E32 = Y.
The remaining directional control settings are not set automatically if setting E32 = AUTO. They
have to be set by the user, whether setting E32 = AUTO or Y. These settings are:
DIR3, DIR4, ORDER, and E32IV
All these settings are explained in detail in the remainder of this subsection.
Settings
Zone 1/Level 1 and Zone 2/Level 2 elements, except 67P1 and 67P2, are fixed forward and may
not be changed by the user.
DIR3—Zone 3/Level 3 Element Direction Setting
Setting Range:
F = Direction Forward
R = Direction Reverse
Table 4.1 shows the elements that are controlled by each level direction setting.
Table 4.1: Elements Controlled by Zone/Level Direction Settings
(Corresponding Overcurrent and Directional Element Figure Numbers in Parentheses)
Level Direction
Settings
Phase
Distance
Ground
Distance
Residual
Ground
Negative-
Sequence
Forward
M1P (3.4)
M1PT (3.11)
Z1G (3.7)
Z1GT(3.11)
67G1 (3.15)
67G1T (3.15)
67Q1 (3.16)
67Q1T (3.16)
Forward
M2P (3.5)
M2PT (3.11)
Z2G (3.8)
Z2GT(3.11)
67G2 (3.15)
67G2T (3.15)
67Q2 (3.16)
67Q2T (3.16)
DIR3 = F or R
M3P (3.6)
M3PT (3.11)
Z3G (3.9)
Z3GT (3.11)
67G3 (3.15)
67G3T (3.15)
67Q3 (3.16)
67Q3T (3.16)
ORDER—Ground Directional Element Priority Setting
Setting Range:
Q Negative-sequence voltage-polarized directional element
V Zero-sequence voltage-polarized directional element
I
Channel IP current-polarized directional element
Setting ORDER can be set with any combination of Q, V, and I. The order in which these
directional elements are listed determines the priority in which they operate to provide Best
Choice Ground Directional logic control. See Figure 4.8.
Содержание SEL-311B
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