Basler Electric BE1-851 - Manual (Page 182)

SL-143 = 2
SL-243 = 2
SL-343 = 2
SL-101 = 1
SL-VOA = ALMMAJ
SL-VO1 = VO11+BFPU+101T
SL-VO2 = 79C+101C
SL-VO3 = IN4*/343
SL-VO4 = VO12*/VO5*IN4*/343
SL-VO5 = BFT
SL-VO6 = 0
SL-VO7 = 0
SL-VO8 = VO11
SL-VO9 = /IN2+143+/101SC+VO5+150TPT+150TNT
SL-VO10 = VO11
SL-VO11 = 50TPT+50TNT+150TPT+150TNT+51PT+51NT
SL-VO12 = 50TPPU+50TNPU+150TPPU+150TNPU+51PPU+51NPU
SL-VO13 = 0
SL-VO14 = 0
SL-VO15 = /IN4+343
Feeder_3 Logic Scheme
Logic scheme Feeder_3 is meant for use on a feeder breaker and provides all overcurrent and breaker
failure protection, reclosing, and control functions required for a typical feeder in a non-directional
overcurrent protection application. This logic scheme is intended for use in conjunction with other
programmable relays using BUS and BACKUP schemes to provide protection when the relay is out of
service.
Automatic reclosing is initiated by the breaker opening. Reclosing is disabled after a manual trip by a
control switch slip contact. In this logic scheme, the disable logic is connected to the drive to lockout
(DTL) input. The recloser will remain in lockout until the breaker closes and the reset timer times out.
When used with other programmable relays using logic scheme BUS and BACKUP, this scheme can
provide complete high-speed overcurrent protection for the transformers, bus, and feeders in a radial
system substation.
The components of Feeder_3 logic are summarized in Tables 8-13 through 8-16. Figure 8-7 is a one-line
diagram of Feeder_3 logic and Figure 8-8 is a diagram representing the logic settings and equations of
Feeder_3 logic.
Normal Operation - Control
The virtual breaker control switch is programmed to provide manual trip and close control of the breaker.
Control functions of this logic scheme use traditional contact sensing inputs and virtual switches. Virtual
switches that are not needed may simply go unused. The protection engineer may choose to free up
contact sensing inputs for other uses by using the virtual switches exclusively for control functions.
Normal Operation - Protection
All overcurrent function blocks and the breaker failure function block re-trip output are enabled in
Feeder_3 logic for tripping via OUT1. The 150T function blocks are set up as high set instantaneous
functions which drive the recloser to lockout when they trip. Setting the pickup at zero in the four setting
groups can individually disable each overcurrent function block. The 50TN, 50TQ, 51N, and 51Q function
blocks are torque controlled by either IN3 or Virtual Switch 243. All N and Q function blocks or only the
51N and 51Q function blocks may be inhibited. This is done in BESTlogic by modifying the inputs to the
function blocks.
Normal Operation - Reclosing
The reclosing logic in Feeder_3 is initiated by the breaker opening. Automatic reclosing is disabled for a
manual trip by a control switch slip contact. Setting the first reclose time can disable the recloser function
block = zero in the four setting groups.
8-26
BE1-851 Application 9289900990 Rev R