Basler Electric BE1-851 - Manual (Page 173)

SL-143 = 0
SL-243 = 0
SL-343 = 0
SL-101 = 0
SL-VOA = ALMMAJ
SL-VO1 = VO8*IN4+BFPU+VO11*/IN4
SL-VO2 = VO9*IN4
SL-VO3 = IN4
SL-VO4 = VO12*/IN5*IN4
SL-VO5 = BFT
SL-VO6 = 0
SL-VO7 = 0
SL-VO8 = 51PT+51NT
SL-VO9 = 50TPT+50TNT
SL-VO10 = VO11
SL-VO11 = 50TPT+50TNT+51PT+51NT
SL-VO12 = 50TPPU+50TNPU+51PPU+51NPU
SL-VO13 = 0
SL-VO14 = 0
SL-VO15 = /IN4
Feeder_2 Logic Scheme
Logic scheme Feeder_2 is meant for use on a feeder breaker and provides overcurrent, breaker failure
protection, reclosing, and the 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 the BUS and BACKUP logic schemes to provide protection when the relay is
out of service.
Automatic reclosing uses a reclose initiate scheme and is initiated by protective trip.
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 substations. The components of Feeder_2 logic are summarized in Tables 8-9 through 8-12.
Figure 8-5 is a one-line diagram of Feeder_2 logic and Figure 8-6 represents the logic settings and
equations of Feeder_2.
Normal Operation - Control
The virtual breaker control switch is programmed to provide manual trip and close control of the breaker.
The control functions of this logic scheme use both 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 the various control
functions.
Normal Operation - Protection
All overcurrent function blocks and the breaker failure function block re-trip output are enabled in
Feeder_2 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 0 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_2 uses a reclose initiate (RI) scheme where each step in the reclosing
sequence is initiated by a protective trip. Setting the first reclose time at zero in the four setting groups
can disable the recloser function block.
Reclosing can be disabled by either IN2 or Virtual Switch 143 that is connected to the drive to lockout
(DTL) input of the recloser function block. In this scheme, enabling the recloser after a “one shot” trip will
9289900990 Rev R
BE1-851 Application 8-17