Schweitzer Engineering Laboratories SEL-251 - Meter D; Meter Rd

Date Code 970103 Communications 3-13
SEL-251, -2, -3 Instruction Manual
METER D
METER D displays demand and peak demand values of the following:
IA : A-phase current (primary amps)
B : B-phase current (primary amps)
C : C-phase current (primary amps)
R : Ground/residual current (primary amps)
3I2 : 3 x negative-sequence current (primary amps)
P : Three-phase real power (MW)
Q : Three-phase reactive power (MVAR)
The demand ammeter time constant setting (DATC) is also used in determining I, P, and Q
demand values.
=>METER D <ENTER>METER D <ENTER>
Example 21.6 kV distribution feeder Date: 04/01/93 Time: 09:13:33
DEM IA=347 B=349 C=349 R=4
3I2=3 P=12.897 Q=0.997
PK IA=412 B=410 C=414 R=15
3I2=13 P=14.701 Q=1.280
=>
If control power to the relay is interrupted, the demand and peak demand values reset to zero.
METER RD
METER RD resets demand values to zero.
=>METER RD <ENTER>METER RD <ENTER>
Reset Demand Meter: Are you sure (Y/N) ? Y <ENTER>Y <ENTER>
Example 21.6 kV distribution feeder Date: 04/01/93 Time: 09:14:15
DEM IA=0 B=0 C=0 R=0
3I2=0 P=0.000 Q=0.000
PK IA=412 B=410 C=414 R=15
3I2=13 P=14.701 Q=1.280
=>
The demand values automatically reset if an active setting group change is made with global
setting DEMR=Y (see SET G p in this section).