Schweitzer Engineering Laboratories SEL-421-4 - Table 6.45 Global Settings; Table 6.46 Breaker Monitor Settings

6.174
SEL-421 Relay Instruction Manual Date Code 20171021
Protection Applications Examples
230 kV Tapped Transmission Line Application Example
SEL-421 Settings at Substation T
The settings in Table 6. 45 through Table 6.50 provide 230 kV transmission line
protection, autoreclose, and substation restoration at Substation T as described in
this application example.
Protection freeform SEL
OGIC control equations appear in tabular form (see
Figure 6.48). These equations, which are the freeform settings extracted from a
SEL-421, are also shown in Figure 6.53.
Global Settings
Breaker Monitor
Table 6.45 Global Settings
a
a
This table shows only the global settings relevant to this particular application example.
Setting Prompt Entry
General Global Settings
SID Station Identifier Station T
RID Relay Identifier SEL-421
NUMBK Number of Breakers in Scheme 2
BID1 Breaker 1 Identifier Circuit Breaker 1–115 kV
BID2 Breaker 2 Identifier Circuit Breaker 2–115 kV
NFREQ Nominal System Frequency (Hz) 60
PHROT System Phase Rotation ABC
Current and Voltage Source Selection
ESS Current and Voltage Source Selection Y
LINEI Line Current Source IW
BK1I Breaker 1 Current Source NA
BK2I Breaker 2 Current Source NA
Table 6.46 Breaker Monitor Settings
a
a
This table shows only the breaker monitor settings relevant to this particular application
example.
Setting Prompt Entry
Breaker Configuration
BK1TYP Breaker 1 Trip Type (Single-Pole = 1, Three-Pole = 3) 3
BK2TYP Breaker 2 Trip Type (Single-Pole = 1, Three-Pole = 3) 3
Breaker 1 Inputs
52AA1 N/O Contact Input—BK1 (SELOGIC) NOT IN101
Breaker 2 Inputs
52AA2 N/O Contact Input—BK2 (SELOGIC) NOT IN102