Schweitzer Engineering Laboratories SEL-751 - Figure 2.22 Typical Current Connections

2.31
Date Code 20170927 Instruction Manual SEL-751 Relay
Installation
AC/DC Control Connection Diagrams
Station DC Battery
Monitor
Use the station dc battery monitor (one of the options available with the
Voltage Card options) in the SEL-751 to alarm for undervoltage and
overvoltage dc battery conditions and to view how station dc battery voltage
fluctuates during tripping, closing, and other dc control functions. The
monitor measures station dc battery voltage applied to the rear-panel terminals
E03 (VBAT+) and E04 (VBAT–) of the SEL
ECT 2 AVI/4 AFDI voltage/arc-
flash card in Slot E. Refer to Section 5: Metering and Monitoring for details
on the station dc battery monitor function and settings.
AC/DC Connections
and Applications
Figure 2.22 shows typical phase and neutral current connections for a feeder
application. Figure 2.23 through Figure 2.32 show ac/dc connection diagrams
for various applications. See Figure 2.20 and Figure 2.21 for other voltage
connections.
Figure 2.22 Typical Current Connections
SEL-751
The current transformers and the SEL-751
chassis must be grounded in the relay cabinet.
A
B
C
IN
IC
IB
IA
Z08
Z07
Z06
Z05
Z04
Z03
Z02
Z01
52
FEEDER
BUS