Schweitzer Engineering Laboratories SEL-251 - Settings Sheets

SETTINGS SHEET Page 1 of 5
FOR THE SEL-251, -2, -3 RELAY Date
RELAY SETTINGS GROUP ___
Date Code 20000421
General Data
Relay Identifier (39 characters) ID =
Current Transformer Ratio (0.001-10000) CTR =
Potential Transformer Ratio (0.001-10000) PTR =
Positive-Sequence Line Resistance, Ohms pri (0.001-10000) R1 =
Positive-Sequence Line Reactance, Ohms pri (0.001-10000) X1 =
Zero-Sequence Line Resistance, Ohms pri (0.001-10000) R0 =
Zero-Sequence Line Reactance, Ohms pri (0.001-10000) X0 =
Current Limiting Reactor Resistance, Ohms pri (0.001-10000) RS =
Current Limiting Reactor Reactance, Ohms pri (0.001-10000) XS =
Line Length, unitless. If LL=0.001, fault locator is disabled. (0.001-10000) LL =
Demand Ammeter Data
Demand Ammeter Time Constant, minutes (5-60) DATC =
Phase Demand Ammeter Threshold, A sec (1.00-12.00)* PDEM =
Negative-Sequence Demand Ammeter Threshold, A sec (0.25-12.00)* QDEM =
Ground/Residual Demand Ammeter Threshold, A sec (0.25-12.00)* NDEM =
Reclosing Relay Data
Reclosing Relay Open Interval Time No. 1, cycles. 79OI1=0 defeats
reclosing. (0-16000)
79OI1 =
Reclosing Relay Open Interval Time No. 2, cycles (0-16000) 79OI2 =
Reclosing Relay Open Interval Time No. 3, cycles (0-16000) 79OI3 =
Reclosing Relay Open Interval Time No. 4, cycles (0-16000) 79OI4 =
Reclosing Relay Reset Interval Time, cycles (0-16000) 79RST =
Reclosing Relay Shot Mask (00000-11111 binary) M79SH =
Internal Torque Control Elements
Phase Instantaneous Overcurrent, A sec (0.50-100.00)* 50C =
Low-Set Limit for Undervoltage Element 27, V l-l sec (0-250) 27L =
High-Set Limit for Undervoltage Element 27, V l-l sec (0-250) 27H =
Select whether 27 is Phase-to-Phase (2), Three-Phase (3), or Enable High-
Side Blown-Fuse Protection (4)
27C =
Internal Torque Control Conditions (0=None, V=27, I=50C, 3=both) TCI =
* Settings range for 5-amp nominal current inputs shown. Divide by five for 1-amp nominal current
input relays.