3.20.5 Fault Value Recording
The following analog signals are recorded:
●
Phase currents of all 4 ends of the transformer
●
Residual current measured by the P634 at the Tx4 (x=1, 2 or 3)
transformer
●
Voltage
Recording of residual currents and voltage can be disabled by setting, to avoid
recording if no CT/VT is connected.
Residual currents can be labelled by setting either as neutral current IN,
measured in the common return path of the three phase currents (e.g.
FT_RC: Rec. analog chann. 4 = Current IN,a) or as starpoint current IY,
measured through a dedicated plant CT (e.g. FT_RC: Rec. analog chann. 4 =
Current IY,a).
The signals are recorded before, during and after a fault. The window length for
oscillography recording before and after the fault can be set. A maximum time
period of 16.4 s (for 50 Hz) or 13.7 s (for 60 Hz) is available for recording. This
period can be divided among a maximum of eight faults. The maximum
recording time per fault can be set. If a fault, including the set pre-fault and post-
fault times, lasts longer than the set maximum recording time, then recording
will terminate when the set maximum recording time is reached.
The pre-fault time is exactly adhered to if it is shorter than the set maximum
recording time. Otherwise the pre-fault time is set to the maximum recording
time minus a sampling increment, and the post-fault time is set to zero.
If the maximum recording time is exceeded, the analog values for the oldest fault
are overwritten, but not the binary values. If more than eight faults have
occurred since the last reset, then all data for the oldest fault are overwritten.
The analog oscillography data of the fault record can only be read out through
the PC or communication interfaces.
When the supply voltage is interrupted or after a warm restart, the values of all
faults remain stored.
3 Operation P634
P634/EN M/R-42-A // P634‑311‑653 3-121
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