Schweitzer Engineering Laboratories SEL-251 - Page 180

7-18 Maintenance and Testing Date Code 20000421
SEL-251, -2, -3 Instruction Manual
Connect the SEL-251 Relay TRIP and CLOSE output contacts to the
circuit breaker simulator to trip and close the simulator. Connect the
simulator output to a relay input assigned to the circuit breaker status
function (IN5 = 52A in the following example).
Method: 1. Using the SET n command (n is the active setting group), enter the following
settings:
.
.
.
79OI1 = 60 open interval times (cycles)
79OI2 = 600
79OI3 = 900
79OI4 = 0 no fourth open interval
79RST = 1800 reset interval time (cycles)
M79SH = 01010
.
.
.
50L = 4.00 amps, secondary
.
.
.
A1(1234) = 79RS reset state
A2(1234) = 79CY reclose cycle state
.
.
.
A3(1346) = 79LO lockout state
A4(2346) = 79SH shot "bit"; asserts per M79SH setting
TR(1246) = 50L programmable trip conditions
RC(1246) = NA no reclose cancel conditions
.
SEQ(1) = NA no sequence coordination
ETC(1) = NA no externally torque controlled
overcurrent elements
ITC(1) = NA no internally torque controlled
phase overcurrent elements
The setting entry NA (not applicable) leaves the designated variable blank when
the settings are shown.