5.10
SEL-787 Relay Instruction Manual Date Code 20081022
Metering and Monitoring
Metering
=>MET DEM <Enter>
SEL-787 Date: 01/23/2008 Time: 13:46:56
TRNSFRMR RELAY Time Source: Internal
IAD IBD ICD IGD 3I2D
DEMAND (A pri.) 53.9 55.9 54.8 2.1 1.4
LAST RESET = 01/23/2008 13:45:38
=>
Figure 5.12 METER DEM Command Report
=>MET P <Enter>
SEL-787 Date: 01/23/2008 Time: 13:47:00
TRNSFRMR RELAY Time Source: Internal
IAPD IBPD ICPD IGPD 3I2PD
DEMAND (A pri.) 55.8 57.8 56.7 2.1 1.4
LAST RESET = 01/23/2008 13:45:37
=>
Figure 5.13 METER P Command Report
Harmonic Metering
The harmonic metering function in the SEL-787 reports the current and
voltage harmonics through the fifth harmonic and the total harmonic distortion
percentage (THD %). Table 5.8 shows the harmonic values reported.
Figure 5.14 provides an example of the METER H (Harmonic) command
report.
=>MET H <Enter>
SEL-787 Date: 01/23/2008 Time: 13:44:27
TRNSFRMR RELAY Time Source: Internal
IAW1 IBW1 ICW1 IAW2 IBW2 ICW2 IN VAB VBC VCA
Fund (sec) 1.0 1.0 1.0 2.0 2.0 2.0 1.2 67.2 66.1 117.7
2nd (%) 0.3 0.4 0.5 0.2 0.3 0.3 0.4 0.0 0.0 0.0
3rd (%) 0.5 0.6 0.6 0.2 0.3 0.2 0.3 0.0 0.0 0.0
4th (%) 0.4 0.4 0.5 0.2 0.2 0.3 0.2 0.0 0.0 0.0
5th (%) 0.6 0.6 0.9 0.3 0.3 0.2 0.4 0.0 0.0 0.0
THD (%) 0.9 1.0 1.2 0.5 0.5 0.5 0.7 0.0 0.0 0.0
=>
Figure 5.14 METER H Command Report
Table 5.8 Measured Harmonic Meter Values
Relay Option Harmonic Values
All Fundamental magnitude (secondary A) and 2nd, 3rd, 4th,
harmonic % values and THD % of line currents IAW1, IBW1,
ICW1, IAW2, IBW2, and ICW2
With Neutral Current
(IN) option
Fundamental magnitude (secondary A), 2nd, 3rd, 4th, 5th
harmonic % values, and THD % of neutral current IN
With Voltage Option Fundamental magnitude (secondary V), 2nd, 3rd, 4th, and 5th
harmonic % values and THD % of voltages VAB, VBC, VCA or
VAN, VBN, VCN
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