Schweitzer Engineering Laboratories SEL-311C - Directional Control for Ground Distance and Residual Ground Overcurrent Elements; Figure 4.5 General Logic Flow of Directional Control for Ground Distance and Residual Ground Overcurrent Elements

4.9
Date Code 20060320 Instruction Manual SEL-311C Relay
Loss-of-Potential, CCVT Transient Detection, Load-Encroachment, and Directional Element Logic
Directional Control for Ground Distance and Residual Ground Overcurrent Elements
Directional Control for Ground Distance and
Residual Ground Overcurrent Elements
Setting E32 configures directional control for distance and overcurrent
elements. Setting E32 and other directional control settings are described in
Directional Control Settings on page 4.21.
Three directional elements are available to control the ground distance and
residual ground overcurrent elements. These three directional elements are:
➤ Negative-sequence voltage-polarized directional element
➤ Zero-sequence voltage-polarized directional element
➤ Channel IP current-polarized directional element
q Figure 4.6; w Figure 4.7; e Figure 4.8; r Figure 4.9; t Figure 4.10; y Figure 4.11; u Figure 4.12.
Figure 4.5 General Logic Flow of Directional Control for
Ground Distance and Residual Ground Overcurrent Elements
Figure 4.5 gives an overview of how these directional elements are enabled
and routed to control the ground distance and residual ground overcurrent
elements.
Note in Figure 4.5 that setting ORDER enables the directional elements. Set
ORDER with any combination of Q, V, and I. Setting choices Q, V, and I
correspond to directional elements as follows:
➤ Q (Negative-sequence voltage-polarized directional element)
➤ V (Zero-sequence voltage-polarized directional element)
➤ I (Channel IP current-polarized directional element)
The order in which these directional elements are listed in setting ORDER
determines the priority in which they operate to provide Best Choice Ground
Directional™ logic control. See discussion on setting ORDER in Directional
Control Settings.
32IE
"I" listed
in setting
ORDER
F32I/
R32I
Channel IP
Current-
Polarized
y
Best Choice
Ground
Directional
Logic
e
Zero-
Sequence
Voltage-
Polarized
t
Negative-
Sequence
Voltage-
Polarized
r
32VE
"V" listed
in setting
ORDER
"Q" listed
in setting
ORDER
32QGE
50QF/
50QR
50GF/
50GR
F32V/
R32V
F32QG/
R32QG
32GF/
32GR
Enable Directional
Elements with
Setting ORDER
Internal
Enables
Relay Word
Bit Outputs
Directional
Elements
Relay Word
Bit Outputs
Relay Word
Bit Outputs
Directional
Element
Routing
q
w
u