Schweitzer Engineering Laboratories SEL-251 - Page 101

Date Code 970103 Event Reporting 4-9
SEL-251, -2, -3 Instruction Manual
Example Event Report 2, Continued
Settings for group 1
Example 21.6 kV distribution feeder
CTR =120.00 PTR =180.00
R1 =0.58 X1 =1.50 R0 =1.44 X0 =4.56
RS =0.05 XS =0.53 LL =2.42
DATC =15 PDEM =12.00 QDEM =12.00 NDEM =0.99
79OI1=60 79OI2=600 79OI3=900 79OI4=0
79RST=1800 M79SH=00000
50C =99.99 27L =0.00 27H =0.00 27C =2 TCI =0
50Q =99.99 50QT =0
51QP =6.00 51QTD=15.00 51QC =3 51QRS=N
50NL =19.99 50NLT=2 50NH =99.99
51NP =1.50 51NTD=2.00 51NC =3 51NRS=N
50L =99.99 50LT =0 50H =40.01
51P =6.00 51TD =6.00 51C =3 51RS =N
52APU=1200 52ADO=0 TSPU =0 TSDO =0
TKPU =0 TKDO =0 TZPU =0 TZDO =0
SELogic Equations
S(123) =
A(12) =
B(12) =50NLT
C(12) =50NL
D(12) =
E(34) =79RS+79CY+52AT
F(34) =IN6
G(34) =
H(34) =
J(1234) =
K(1234) =
L(1234) =
A1(1234)=TF
A2(1234)=NDEM
V(56) =B*E*F
W(56) =C*E*F
X(56) =
Y(56) =
Z(56) =
A3(1346)=79CY
A4(2346)=
TR(1246)=50H+51T+51NT+V
RC(1246)=50H+TF
ER(1246)=51P+51QP+51NP+TF+W
SEQ(1) =
ETC(1) =
ITC(1) =
Global settings
DEMR =Y CFT =60 TDUR =4 TFT =30 TGR =180
ITT =5 TIME1=15 TIME2=0 AUTO =2 RINGS=3
IN1 =SS1 IN2 =DT IN3 =RE IN4 =
IN5 =52A IN6 =
Group 1 is enabled because IN1=SS1 and is energized.
SS2 = SS3 = 0 by default because they are not
assigned to inputs
There is a time delay pickup (52APU) on the 52AT
function
Input IN6 functions as a permissive trip input for the 50NLT element
The 50NLT element is supervised by 52AT when the reclosing relay is in the lockout
state (79RS = 0 and 79CY = 0 when the reclosing relay is in the lockout state)
Programmable tripping conditions
Programmable reclose cancel conditions
Input IN6 is used as a permissive trip
input in the above logic
Programmable event report trigger conditions