Schweitzer Engineering Laboratories SEL-351-5, Instruction Manual

Page: 392 / 706

9.36
SEL-351-5, -6, -7 Relay Instruction Manual
Date Code 20070117
Setting the Relay
Relay Word Bits (Used in SEL
OGIC
Control Equations)
61 GNDSW Directional element for low-impedance grounded or
ungrounded/high-impedance grounded systems is operating
on neutral channel (IN) current I
N
; if GNDSW = logical 0,
then directional element is running off of residual ground
current I
G
instead (see internal enables discussion, following Table 4.2 )
Testing
50NF Forward direction neutral ground overcurrent
threshold exceeded (see
Figure 4.8 )
50NR Reverse direction neutral ground overcurrent
threshold exceeded (see
Figure 4.8 )
32NE Internal enable for directional elements for low-impedance grounded,
Petersen Coil-grounded, or ungrounded/high-impedance grounded systems
(see
Figure 4.8 )
F32N Forward directional element for low-impedance grounded, Petersen Coil-
grounded (wattmetric element only—see F32W), or ungrounded/high-imped-
ance grounded systems (depending on ORDER setting—see
Table 4.1 )
Testing, Special
directional control
schemes
R32N Reverse directional element for low-impedance grounded, Petersen Coil-
grounded (wattmetric element only—see R32W), or ungrounded/high-imped-
ance grounded systems (depending on ORDER setting—see
Table 4.1 )
32NF Forward directional control routed to neutral ground overcurrent elements (see
Figure 4.16 )
32NR Reverse directional control routed to neutral ground overcurrent elements (see
Figure 4.16 )
62 PMDOK Phasor measurement data OK (see Synchrophasor Relay Word Bits on
page L.11 )
Synchrophasors
F32W Forward directional output for Petersen Coil Wattmetric element
(an input to F32N logic) Control, Indication
R32W Reverse directional output for Petersen Coil Wattmetric element
(an input to R32N logic)
F32C Forward directional element for
Petersen Coil Incremental Conductance Element
R32C Reverse directional element for
Petersen Coil Incremental Conductance Element
NSA A-phase forward-fault identification logic output used in fault-type target
logic for Petersen Coil grounded and ungrounded/high-impedance grounded
systems (see
Front-Panel Target LEDs on page 5.31 )
NSB B-phase forward-fault identification logic output used in fault-type target
logic for Petersen Coil-grounded and ungrounded/high-impedance grounded
systems (see
Front-Panel Target LEDs on page 5.31 )
NSC C-phase forward-fault identification logic output used in fault-type target
logic for Petersen Coil-grounded and ungrounded/high-impedance grounded
systems (see
Front-Panel Target LEDs on page 5.31 )
a
IMPORTANT: See Appendix F for special instructions on setting negative-sequence overcurrent elements.
b
Reserved for future use.
c
The OPEN command (Relay Word bit OC) and CLOSE command (Relay Word bit CC) are not embedded in the Trip Logic (see Figure 5.1 ) and
Close Logic (see Figure 6.1 ), respectively. See the Note following Figure 5.2 and the Note in the Lockout State discussion, following
Table 6.1 , concerning the OC Relay Word bit ( OPEN command). See the Note in the Set Close discussion, following Figure 6.1 , concerning the
CC Relay Word bit ( CLOSE command).
Table 9.6 Relay Word Bit Definitions for SEL-5, -6, -7 (Sheet 18 of 18)
Row Bit Definition Primary Application