Schweitzer Engineering Laboratories SEL-421-4 - Table 6.6 Settings for 230 Kv Overhead TX Example

6.15
Date Code 20171021 Instruction Manual SEL-421 Relay
Protection Applications Examples
230 kV Overhead Distribution Line Example
Example Completed
This completes the application example describing configuration of the SEL-421
for step-distance protection of a 230 kV overhead transmission line. You can use
this example as a guide when setting the relay for similar applications. Analyze
your particular power system so you can properly determine your corresponding
settings.
Relay Settings
Table 6.6 lists the protective relay settings for this example. Settings used in this
example appear in boldface type.
Table 6.6 Settings for 230 kV Overhead TX Example (Sheet 1 of 4)
Setting Prompt Entry
General Global (Global)
SID Station Identifier (40 characters) HARVARD -
230 kV
RID Relay Identifier (40 characters) SEL-421 Relay
NUMBK Number of Breakers in Scheme (1, 2) 1
BID1 Breaker 1 Identifier (40 characters) Circuit Breaker 1
NFREQ Nominal System Frequency (Hz) 60
PHROT System Phase Rotation (ABC, ACB) ABC
DATE_F Date Format (MDY, YMD, DMY) MDY
FAULT Fault Condition Equation (SEL
OGIC Equation) 50P1 OR 51S1
OR Z2P OR Z2G
OR Z3P OR Z3G
Current and Voltage Source Selection (Global)
ESS Current and Voltage Source Selection (Y, N, 1, 2, 3, 4) N
Breaker Configuration (Breaker Monitoring)
EB1MON Breaker 1 Monitoring (Y, N) N
BK1TYP Breaker 1 Trip Type (Single Pole = 1, Three Pole = 3) 3
Breaker 1 Inputs (Breaker Monitoring)
52AA1 A-Phase N/O Contact Input—BK1 (SELOGIC Equation) IN101
Line Configuration Settings (Group)
CTRW Current Transformer Ratio—Input W (1–50000) 100
CTRX Current Transformer Ratio—Input X (1–50000) 200
PTRY Potential Transformer Ratio—Input Y (1–10000) 2000.0
VNOMY Pt Nominal Voltage (L-L)—Input Y (60–300 V secondary) 115
PTRZ Potential Transformer Ratio—Input Z (1–10000) 2000.0
VNOMZ PT Nominal Voltage (L-L)—Input Z (60–300 V secondary) 115
Z1MAG Positive-Sequence Line Impedance Magnitude
(0.05–255  secondary)
1.95
Z1ANG Positive-Sequence Line Impedance Angle (5.00–90 degrees) 84.00
Z0MAG Zero-Sequence Line Impedance Magnitude
(0.05–255  secondary)
6.20
Z0ANG Zero-Sequence Line Impedance Angle (5.00–90 degrees) 81.50