9.7
Date Code 20170814
Instruction Manual
SEL-700G Relay
Analyzing Events
Event Reporting
The SEL-700G supports the following four separate event report types (model
dependent):
➤
Standard Analog Event Report (EVE command)
➤
Digital Event Report (EVE D command)
➤
Differential Event Report (EVE DIFz command, where z = 1, 2,
or 3 for the three 87 elements)
➤
Ground Event Report (EVE GND command)
Analog Event Reports (EVE Command)
The Analog Event Report includes:
➤
Analog values of currents IAX, IBX, ICX, IN, IAY, IBY, ICY (if
available), voltages VAX (VABX), VBX (VBCX), VCX
(VCAX), VAY (VABY), VBY (VBCY), VCY (VCAY), VN, VS
and frequency FREQX, FREQY. Specific analog quantities
depend on the SEL-700G model number.
➤
Digital states of the base model digital inputs (2) and digital
outputs (3)
➤
Event Summary
➤
Relay Settings
Use the EVE command to retrieve the reports. The general command format
is:
EVE n R X Y
The relay displays currents and voltages in primary values as part of the
report. If the winding phase CTs are wye connected, the relay can accurately
derive the primary currents from the secondary values through multiplying
them by the corresponding CT ratio.
Delta-connected CTs, in general, remove zero-sequence current and introduce
a phase shift. They also increase magnitude by
under balanced system
conditions and as high as two times under unbalanced condition. As a result,
the relay cannot derive the primary currents/quantities accurately. The relay
performs the following under all system conditions in the case of delta-
connected CTs. The primary currents displayed are derived from the
secondary values through multiplying them by the corresponding CT ratio and
dividing them by
. The phase angles are not compensated and reflect the
same values as measured on the secondary.
Filtered and Unfiltered Analog Event Reports
The SEL-700G samples the power system measurands (ac voltage and ac
current) 32 times per power system cycle. A digital filter extracts the
fundamental frequency component of the measurands. The relay operates on
where
n event number (defaults to 1 if it is not specified)
R specifies raw (unfiltered analog) data and displays 32
samples per cycle; if not specified, the data are filtered
and display 4 samples per cycle.
X selects X-side voltages and currents as well as IN current.
(Only available for the SEL-700GT+ model).
Y selects Y-side voltages and currents as well as VS voltage.
(Only available for the SEL-700GT+ model).
NOTE:
In the SEL-700GT+ model, if
X or Y is not specified, the relay
defaults to the X-side event report.
3
3
Содержание SEL-700G Series
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