Schweitzer Engineering Laboratories SEL-251 - Page 81

Date Code 970103 Communications 3-23
SEL-251, -2, -3 Instruction Manual
A list of relay settings follow. Setting ranges and explanations have been added.
=>>SET 1 <ENTER>
SET clears events. CTRL-X cancels.
SEL-151-R407 Group Settings
Group = 1
Active group = 1
Enter data, or <ENTER> for no change
Range
ID : Example 21.6 kV distribution feeder ? 39 characters
CTR : ...................................................................= 120.00 ? 0.001-10000
Current transformer ratio
PTR : ...................................................................= 180.00 ? "
Potential transformer ratio
R1 : Ohms Pri....................................................= 0.58 ? 0.001-10000
Positive-sequence line resistance
X1 :....................................................................= 1.50 ? "
Positive-sequence line reactance
R0 :....................................................................= 1.44 ? "
Zero-sequence line resistance
X0 :....................................................................= 4.56 ? "
Zero-sequence line reactance
RS :....................................................................= 0.00 ? "
Current-limiting reactor resistance
XS :....................................................................= 0.00 ? "
Current-limiting reactor reactance
LL : Line Len.....................................................= 2.42 ? 0.001-10000
Line length (unitless); If LL=0.001, no fault location information
DATC : Dem, 5-60 min...........................................= 15 ?
Demand ammeter time constant
PDEM : Ph Dem Thr, A sec ....................................= 12.00 ? 1.00-12.00
Phase demand ammeter threshold for PDEM
QDEM : 3I2 Dem Thr, A sec ...................................= 12.00 ? 0.25-12.00
Negative-sequence demand ammeter threshold for QDEM
NDEM : IR Dem Thr, A sec.....................................= 1.00 ? "
Ground/residual demand ammeter threshold for NDEM