R.4.21
Date Code 20111215 Reference Manual SEL-421 Relay
Communications Interfaces
Communications Card
The DEMAND region contains demand and peak demand information. This
region is updated every 15 seconds. See Table 4.21 for the Map.
1058 ANG1_DIF float VS1 and VP angle difference, in degrees
105A VS1_SLIP float VS1 frequency slip with respect to VP, in HZ
105C ANG2_DIF float VS2 and VP angle difference, in degrees
105E VS2_SLIP float VS2 frequency slip with respect to VP, in HZ
1060 PA float phase A real power
1062 PB float phase B real power
1064 PC float phase C real power
1066 P float total real power
1068 QA float phase A reactive power
106A QB float phase B reactive power
106C QC float phase C reactive power
106E Q float total reactive power
1070 SA float phase A apparent power, if available
1072 SB float phase B apparent power, if available
1074 SC float phase C apparent power, if available
1076 S float total apparent power
1078 PFA float phase A power factor
107A PFB float phase power factor
107C PFC float phase power factor
107E PF float 3-phase power factor
1080 PEA float positive phase A energy in KWh
1082 PEB float positive phase B energy in KWh
1084 PEC float positive phase C energy in KWh
1086 PE float total positive energy in KWh
1088 NEA float negative phase A energy in KWh
108A NEB float negative phase B energy in KWh
108C NEC float negative phase C energy in KWh
108E NE float total negative energy in KWh
Table 4.21 SEL-421 Communications Card Database Structure—
DEMAND Region (Sheet 1 of 2)
Address
(Hex)
Name Type Description
2000 _YEAR int 4-digit year when data was sampled
2001 DAY_OF_YEAR int 1–366 day when data was sampled
2002 TIME(ms) long int Time of day in msec when data was sampled
(0–86,400,00)
2004 IA float phase A demand current
2006 IB float phase B demand current
Table 4.20 SEL-421 Communications Card Database Structure—METER
Region (Sheet 2 of 2)
Address
(Hex)
Name Type Description
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