Waveform Capture - Siemens SIPROTEC 7SJ62 Instruction Manual

Functions
Transfer of
Measured Values
Set points

6.19.3 Waveform Capture

6-170
− The long-term averages of the three phase currents I
ponents I for the three phase currents; and the real power P, reactive power Q, and
1
apparent power S; in primary values. The period of time for averaging is selectable.
− Minimum and maximum values for the above mentioned long-term averages, in-
cluding the date and time they were last updated, in primary values.
− Real and reactive energy flow (including direction of flow) in kWh, MWh, or GWh
primary; or in kVArh, MVArh, or GVArh primary.
− Θ/Θ
overload protection values for stator and rotor in % of the trip initiating ex-
out
cessive temperature,
− I
and I real and reactive components of the sensitive ground current de-
Greal Greactive
tection as secondary quantities in mA.
The measured values are updated at a period of ≥ 0.3 s and ≤ 1 s.
The minimum and maximum values are listed with the date and time of the latest up-
date. Using binary inputs or a SCADA interface, the maximum and minimum values
can be reset. In addition, the reset can also take place cyclically, beginning with a pre-
selected point in time.
For the long-term averages mentioned above, the length of the time window for aver-
aging and the frequency with which it is updated can be set. The associated minimum
and maximum values can be reset, using binary inputs or by using the integrated con-
®
trol panel in the DIGSI 4 operating program.
Measured values can be retrieved by SCADA, or through DIGSI
To recognize extraordinary operational conditions, warning levels can be pro-
grammed. When a programmed limit value is exceeded (or fallen below), a message
is generated that can be masked to both output relays and LEDs. In contrast to the
actual protective functions, such as time-overcurrent protection or overload protection,
this monitoring program may becomes lower.
The following individual limit value levels are configured, when delivered from factory:
− Falling below a preset current in any phase
− Exceeding a preset maximum average current in Phase A
− Exceeding a preset maximum average current in Phase B
− Exceeding a preset maximum average current in Phase C
− Exceeding a preset maximum average positive sequence current
− Exceeding a preset maximum average real power
− Exceeding a preset maximum average reactive power
− Exceeding a preset maximum average apparent power
− Falling below a preset power factor
The 7SJ62 relay is equipped with an oscillographic data saving feature. The momen-
tary values for the measurement quantities
; the positive sequence com-
x
®
4.
7SJ62 Manual
C53000-G1140-C121-1