Schweitzer Engineering SEL-351P, Quick Start Manual

Page: 291 / 674

Date Code 990215 Trip and Target Logic 5-29
SEL-351P Manual Técnico
Figure SECTION 5: .16: SEL-351P Recloser Control Connections to Communications
Equipment for a Three-Terminal Line DCB Scheme
A
DDITIONAL
F
RONT
- P
ANEL
S
TATUS AND
T
ARGET
LED I
NFORMATION
A, B, and C Target LEDs
“A” (Phase A) target LED is illuminated at the rising edge of trip if an overcurrent element
causes the trip and Phase A is involved in the fault [likewise for "B" (Phase B) and "C" (Phase
C) target LEDs]. SEL
OGIC
Control Equation FAULT has to be picked up for three-phase fault
indication.
A, B, and C phase targeting is more secure if both the following are true:
•
True three-phase voltage is connected to the SEL-351P
•
Setting 3PVOLT = Y is made (SET G command)
Target Reset/Lamp Test Front-Panel Pushbutton
When the Target Reset/Lamp Test front - panel pushbutton is pressed:
•
All front - panel LEDs illuminate for one (1) second.
•
All latched target LEDs are extinguished (unlatched).
Other Applications for the Target Reset Function
Refer to the bottom of Figure SECTION 5: .1. The combination of the TARGET RESET
Pushbutton and the TAR R (Target Reset) serial port command is available as Relay Word bit
TRGTR. Relay Word bit TRGTR pulses to logical 1 for one processing interval when either the
TARGET RESET Pushbutton is pushed or the TAR R (Target Reset) serial port command is
executed.