P.3.332
SEL-411L Relay Protection Manual Date Code 20151029
Protection Functions
Protection Application Examples
Figure 3.220 345 kV Overhead Tapped Line With In-Line Transformer
In this example,
➤ Relays T and S are configured as outstations, and Relay R is
configured as a master
➤ An in-line transformer is connected at Terminal T
➤ Charging current compensation is enabled and measured at
terminals S and R
➤ Backup distance protection is implemented in a separate relay
Power System Data
Table 3.168 lists the power system data for this application example. Use this
example as a guide, and substitute the values and parameters that correspond
to your system when you set the relay.
SONET RING
VY
Z1L1, Z0L1
Z1L2, Z0L2
MUX
MUX
BK1
IW
S (345 kV) Z1S, Z0S
IRIG-B
CLK CH1
SEL-411L
Outstation
VY
EIA-422
Z1L3, Z0L3
EIA-422
DIRECT FIBER
IRIG-B
BK2
IAX
C
A
B
c
b a
BK3
IW
SEL-411L
Outstation
CH1
CLKCH1
SEL-411L
Master
CH2
T (69 kV) Z1T, Z0T
R (345 kV) Z1R, Z0R
IW
Table 3.168 System Data—345 kV Overhead Transmission Line (Sheet 1 of 2)
Parameter Value
Nominal system line-to-line voltage 345 kV
Nominal frequency 60 Hz
Line length
L1
L2
L3
200 miles
20 miles
10 miles
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