8-30 Breaker Monitor, Metering, and Load Profile Functions Date Code 20001006
SEL-351 Instruction Manual
If there is a fault, time-overcurrent element pickup 51P or 51G picks up and blocks updating
of maximum/minimum metering values.
SELOGIC Control Equation setting FAULT also has control over front-panel target LEDs
INST, A, B, and C (see Front-Panel Target LEDs in Section 5: Trip and Target Logic).]
• The metering value is above the previous maximum or below the previous minimum for
2 cycles.
• For voltage values, the voltage is above 13 V secondary (150 V voltage inputs) or 26 V
secondary (300 V voltage inputs).
• For current values, the currents are above:
0.25 A secondary {5 A nominal}
0.05 A secondary {1 A nominal}
• Megawatt and megavar values are subject to the above voltage and current thresholds.
The SEL-351 Relay stores maximum/minimum values to nonvolatile storage once per day (it
overwrites the previous stored value if it is exceeded). Should the relay lose control power, it will
restore the maximum/minimum values saved by the relay at 23:50 hours on the previous day.
LOAD PROFILE REPORT (AVAILABLE IN FIRMWARE VERSIONS 1, 2, 3, AND 4)
At the interval given by load profile acquisition rate setting LDAR, the relay adds a record to the
load profile buffer. This record contains the time stamp, the present value of each of the analog
quantities listed in the load profile list setting LDLIST and a checksum. These settings are made
and reviewed with the SET R and SHO R serial port commands, respectively. Setting LDAR can
be set to any of the following values: 5, 10, 15, 30, and 60 minutes. Setting LDLIST may contain
any of the following labels shown below.
LABEL QUANTITY RECORDED
IA, IB, IC, IN Phase and neutral current magnitudes
VA, VB, VC, VS Phase and sync voltage magnitudes
IG, I1, 3I2, 3V0, V1, V2 Sequence current and voltage magnitudes
VDC Battery voltage
FREQ Phase frequency
MWA, MWB, MWC, MW3 Phase and 3 phase megaWATTs
MVARA, MVARB, MVARC, MVAR3 Phase and 3 phase megaVARs
PFA, PFB, PFC, PF3 Phase and 3 phase power factor
LDPFA, LDPFB, LDPFC, LDPF3 Phase and 3 phase power factor lead/lag status (0 =
lag, 1= lead)
IADEM, IBDEM, ICDEM, INDEM, IGDEM, 3I2DEM Demand ammeter quantities
MWADI, MWBDI, MWCDI, MW3DI Phase and 3 phase demand megaWATTs in
MWADO, MWBDO, MWCDO, MW3DO Phase and 3 phase demand megaWATTs out
MVRADI, MVRBDI, MVRCDI, MVR3DI Phase and 3 phase demand megaVARs in
MVRADO, MVRBDO, MVRCDO, MVR3DO Phase and 3 phase demand megaVARs out
MWHAI, MWHBI, MWHCI, MWH3I Phase and 3 phase megaWATT hours in
MWHAO, MWHBO, MWHCO, MWH3O Phase and 3 phase megaWATT hours out
MVRHAI, MVRHBI, MVRHCI, MVRH3I Phase and 3 phase megaVAR hours in
MVRHAO, MVRHBO, MVRHCO, MVRH3O Phase and 3 phase megaVAR hours out
Courtesy of NationalSwitchgear.com
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