Schweitzer Engineering Laboratories SEL-421-4 - Page 384

6.48
SEL-421 Relay Instruction Manual Date Code 20171021
Protection Applications Examples
500 kV Parallel Transmission Lines With Mutual Coupling Example
Current and Voltage Source Selection (Global)
ESS Current And Voltage Source Selection (Y, N, 1, 2,
3, 4)
3
LINEI Line Current Source (IW, COMB) COMB
BK1I Breaker 1 Current Source (IW, IX, NA) IW
BK2I Breaker 2 Current Source (IX, COMB, NA) IX
Breaker Configuration (Breaker Monitoring)
EB1MON Breaker 1 Monitoring (Y, N) N
EB2MON Breaker 2 Monitoring (Y, N) N
BK1TYP Breaker 1 Trip Type (Single Pole = 1,
ThreePole=3)
1
BK2TYP Breaker 2 Trip Type (Single Pole = 1,
ThreePole=3)
1
Breaker 1 Inputs (Breaker Monitoring)
52AA1 A-Phase N/O Contact Input—BK1
(SELOGIC Equation)
IN101
52AB1 B-Phase N/O Contact Input—BK1
(SEL
OGIC Equation)
IN102
52AC1 C-Phase N/O Contact Input—BK1
(SEL
OGIC Equation)
IN103
Breaker 2 Inputs (Breaker Monitoring)
52AA2 A-Phase N/O Contact Input—BK2
(SEL
OGIC Equation)
IN104
52AB2 B-Phase N/O Contact Input—BK2
(SEL
OGIC Equation)
IN105
52AC2 C-Phase N/O Contact Input—BK2
(SEL
OGIC Equation)
IN106
Line Configuration (Group)
CTRW Current Transformer Ratio—Input W (1–50000) 400
CTRX Current Transformer Ratio—Input X (1–50000) 400
PTRY Potential Transformer Ratio—Input Y (1–10000) 4500.0
VNOMY PT Nominal Voltage (L-L)—Input Y
(60–300 V secondary)
111
PTRZ Potential Transformer Ratio—Input Z (1–10000) 4500.0
VNOMZ PT Nominal Voltage (L-L)—Input Z
(60–300 V secondary)
111
Z1MAG Positive-Sequence Line Impedance Magnitude
(0.05–255  secondary)
3.98
Z1ANG Positive-Sequence Line Impedance Angle
(5.00–90 degrees)
87.6
Z0MAG Zero-Sequence Line Impedance Magnitude
(0.05–255  secondary)
14.48
Z0ANG Zero-Sequence Line Impedance Angle
(5.00–90 degrees)
82.1
EFLOC Fault Location (Y, N) Y
LL Line Length (0.10–999) 75
Table 6.13 Settings for 500 kV Parallel TX Example (Sheet 2 of 7)
Setting Prompt Entry