Schweitzer Engineering Laboratories, Inc.
SEL-487V Data Sheet
19
Figure 18
VAR-Flow Controlled Time Undervoltage
Load Shedding
Control Inputs and Outputs
The standard SEL-487V includes five independent and
two common inputs, two Form A and three Form C
standard interrupting outputs, and three Form A high-
current interrupting outputs. The following additional
input/output (I/O) boards are currently available.
➤
8 independent inputs, 13 standard Form A, and 2
standard Form C contact outputs.
➤
8 independent inputs and 8 high-speed, high-cur-
rent interrupting Form A contact outputs.
➤
8 independent inputs, 13 high-current interrupting
Form A outputs, and 2 standard Form C contact
outputs.
➤
24 inputs, 6 high-speed outputs, and 2 standard
Form A contact outputs.
Assign the control inputs for control functions,
monitoring logic, and general indication. Each control
output is programmable using SEL
OGIC
control
equations. One board can be added to the 4U chassis, and
two additional I/O boards can be added to the 5U chassis.
Breaker Control
The SEL-487V contains analog voltage inputs for
multiple sources and control inputs to indicate both
breaker and disconnect position, as well as the logic
required to provide breaker control. This includes
separate monitoring functions as well as separate
elements for tripping and closing the breaker. All analog
values are monitored on a per-phase basis to allow
station control access to complete information for
individual components of the system.
Backup Protection
Add reliability and dependability by providing
independent backup protection without increasing relay
count. The SEL-487V can provide primary differential
voltage or current unbalance protection with backup
voltage and overcurrent protection on the capacitor bank.
Volt Drop p.u.
Trip Time
Time (
s)
15
10
5
0
0
0.5
0.25
0.75
1