P.3.316
SEL-411L Relay Protection Manual Date Code 20151029
Protection Functions
Protection Application Examples
Figure 3.218 500 kV Overhead Transmission Line
In this example,
➤ redundant communications channels are employed.
➤ Channel 1 is direct fiber.
➤ Channel 2 uses EIA-422 routed through multiplexers.
➤ tripping is single-pole.
➤ distance protection is enabled as backup.
➤ a separate breaker relay is responsible for autoreclose, breaker
failure, synchronism check, and control functions.
Power System Data
Table 3.166 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.
S (500 kV)
IRIG-B
IW
1600/5
BK1A
Z1S, Z0S
BK1B
IX
1600/5
DSC1
VY
500 kV/111.11 V
CLK CH1
SEL-411L
CH2
EIA-422
MUX
1550 nm Single-mode Fiber
SONET RING
Z1L, Z0L
B1L, B0L
MUX
EIA-422
CH1 CLK
SEL-411L
CH2
R (500 kV)
IRIG-B
IW
2000/5
Z1R, Z0R
DSC2
VY
500 kV/111.11 V
IX
2000/5
Table 3.166 System Data—500 kV Overhead Transmission Line and CT/PT
Ratios (Sheet 1 of 2)
Parameter Value
Nominal system line-to-line voltage 500 kV
Nominal frequency 60 Hz
Line length 70 miles
Line impedance
Z1L
Z0L
B1L (pos. seq. susceptance)
B0L (zero seq. susceptance)
0.505 / mile 87.9° primary
1.929 / mile 76.4° primary
0.009 mS / mile primary
0.005 mS / mile primary
Source S impedance
Z1S = Z0S 50 88° primary
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