5.7
Date Code 20150130 Instruction Manual SEL-787 Relay
Metering and Monitoring
Metering
All maximum and minimum metering values will have the date and time that
they occurred. The analog quantities from Table 5.5 are checked
approximately every 1.0 seconds and, if a new maximum or minimum value
occurs, this value is saved along with the date and time that the maximum or
minimum value occurred. Maximum and minimum values are only checked if
relay element FAULT is deasserted (no fault condition exists) for at least one
second. Additionally, the following minimum thresholds must also be met:
➤ Current magnitudes of IAWn, IBWn, and ICWn: 3% of the
nominal current (INOM • CTRn). (n=1 or 2 depending on the
winding)
➤ Current magnitude of IGWn: IAWn, IBWn, and ICWn all must
be above their thresholds (n =1 or 2 depending on the winding)
➤ Current magnitude of IN: 3% of the nominal IN rating
(INOM • CTRN)
➤ Voltage values (phase-neutral and phase-to-phase): 7.5 • PTR V
and 13 • PTR V, respectively.
➤ Power values (real, reactive, and apparent): All three currents
(IAWn, IBWn, ICWn) and all three voltages (VA, VB, VC or
VAB, VBC, VCA) must be above their thresholds.
Figure 5.7 shows an example device response to the METER M command.
With Voltage Option VAB, VBC, VCA or VAN, VBN, VCN
magnitudes (V primary)
Maximum and minimum real, reactive and
apparent 3-phase power (kW, kVAR, kVA)
Maximum and minimum system frequency (Hz)
With RTD option or SEL-2600 RTD
Module
Maximum and minimum RTD temperatures (°C)
With analog input option Maximum and minimum analog input values
(engineering units)
=>>MET M <Enter>
SEL-787 Date: 11/01/2007 Time: 14:32:32
TRNSFRMR RELAY Time Source: Internal
MAX DATE TIME MIN DATE TIME
IAW1 (A) 607.5 11/01/2007 10:57:48 485.9 11/01/2007 10:56:20
IBW1 (A) 608.3 11/01/2007 11:02:09 604.8 11/01/2007 10:56:35
ICW1 (A) 733.7 11/01/2007 10:56:13 609.7 11/01/2007 11:02:44
IGW1 (A) 1411.5 11/01/2007 10:57:57 2.1 11/01/2007 11:02:57
IN (A) 3002.3 11/01/2007 11:03:07 177.7 11/01/2007 10:55:58
IAW2 (A) 607.8 11/01/2007 10:57:48 116.2 11/01/2007 10:56:20
IBW2 (A) 606.8 11/01/2007 11:02:09 235.8 11/01/2007 10:56:35
ICW2 (A) 608.4 11/01/2007 10:56:13 364.5 11/01/2007 11:02:44
IGW2 (A) 1200.5 11/01/2007 10:58:04 158.8 11/01/2007 11:03:33
VA (V) 10004 11/01/2007 10:57:41 6701.4 11/01/2007 11:03:30
VB (V) 10006 11/01/2007 10:58:02 6704.9 11/01/2007 11:02:32
VC (V) 10025 11/01/2007 10:56:55 6714.7 11/01/2007 11:00:30
KW3P (kW) 9626.1 11/01/2007 11:02:03 -1561.9 11/01/2007 10:56:21
KVAR3P (kVAR) 1814.3 11/01/2007 10:57:42 -7408.9 11/01/2007 11:01:17
KVA3P (kVA) 12133 11/01/2007 11:02:57 2330.7 11/01/2007 10:56:07
FREQ (Hz) 60.0 11/01/2007 11:01:18 60.0 11/01/2007 10:58:05
LAST RESET = LAST RESET = 11/01/2007 10:55:52
=>>
Figure 5.7 METER M Command Report
Table 5.5 Maximum/Minimum Meter Values (Sheet 2 of 2)
Relay Option Max/Min Meter Values
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