Schweitzer Engineering Laboratories SEL-351-5, Instruction Manual

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12.10
SEL-351-5, -6, -7 Relay Instruction Manual
Date Code 20070117
Standard Event Reports, Sag/Swell/Interruption Report, and SER
Standard 15/30-Cycle Event Reports
Note that the ac values change from plus to minus (–) values in Figure 12.3 ,
indicating the sinusoidal nature of the waveforms.
Other figures help in understanding the information available in the event
report current columns:
Figure 12.5 : shows how event report current column data relates to the
actual sampled current waveform and RMS current values.
Figure 12.6 : shows how event report current column data can be
converted to phasor rms current values.
Variable Scaling for Analog Values
The following example shows the difference between two cycles of the analog
values of an event report without variable scaling (command
EVE ) and with
variable scaling (command EVE V ). Variable scaling event reports display
data for currents less than 10 A with two decimal places and data for voltages
less than 10 kV with three decimal places.
Example without variable scaling ( EVE ), wye-connected:
=>> EVE <Enter>
Out In
Currents (Amps Pri) Voltages (kV Pri) 1357 135
IA IB IC IN IG VA VB VC VS Vdc Freq 246A 246
[1]
181 -103 -92 -14 -14 14.8 -7.5 -7.5 13.8 125 60.00 .45. ...
1 158 -161 -3 -3 -0.0 13.2 -13.0 -8.0 125 60.00 .45. ...
-181 102 93 14 14 -14.8 7.4 7.6 -13.7 125 60.00 .45. ...
1 -159 161 3 3 0.1 -13.3 13.0 8.1 125 60.00 .45. ...
[2]
181 -100 -94 -14 -14 14.8 -7.3 -7.7 13.7 125 60.01 .45. ...
-2 159 -160 -3 -3 -0.2 13.3 -12.9 -8.2 125 60.01 .45. ...
-181 99 95 14 14 -14.8 7.2 7.8 -13.6 125 60.01 .45. ...
3 -160 159 3 3 0.3 -13.4 12.9 8.2 125 60.01 .45. ...
VCA Power system phase-to-phase voltage V
CA
(primary kV, PTCONN = DELTA)
b
VS
Voltage measured by channel VS (primary kV)
Vdc
Voltage measured at power input terminals
Z15
and
Z16
(Vdc)
Freq
c
Frequency of channel VA (or V
1
if V
A
is not present) (Hz)
DT
d
Difference time referenced to previous row (microseconds)
a
Also for global setting PTCONN = DELTA when viewing unfiltered (raw) event reports.
b
When global setting PTCONN = DELTA, and relay terminals VA , VB , VC , and N are properly wired
as shown in Figure 2.22 , the filtered event report voltage values are determined as follows:
VAB reflects the measured value from relay terminals VA-N
VBC reflects the measured value from relay terminals VC-N rotated by 180° (V
BC
= –V
CB
)
VCA reflects the value derived from the subtraction of the measured value from relay
terminals
VA-N from the measured value from relay terminals VC-N (V
CA
= V
CB
– V
AB
).
c
Not available with P parameter.
d
Only available with P parameter.
Table 12.2 Standard Event Report Current, Voltage, and Frequency Columns
(Sheet 2 of 2)
Column
Heading
Definition