ABB RELION Series, Техническое руководство

Страница: 599 / 804

Triggering by analog channels
The trigger level can be set for triggering in a limit violation situation. The user can set
the limit values with the
High trigger level and Low trigger level parameters of the
corresponding analog channel. Both high level and low level violation triggering can
be active simultaneously for the same analog channel. If the duration of the limit
violation condition exceeds the filter time of approximately 50 ms, the recorder
triggers. In case of a low level limit violation, if the measured value falls below
approximately 0.05 during the filter time, the situation is considered to be a circuit-
breaker operation and therefore, the recorder does not trigger. This is useful especially
in undervoltage situations. The filter time of approximately 50 ms is common to all the
analog channel triggers of the disturbance recorder. The value used for triggering is
the calculated peak-to-peak value. Either high or low analog channel trigger can be
disabled by setting the corresponding trigger level parameter to zero.
Manual triggering
The recorder can be triggered manually via the LHMI or via communication by setting
the
Trig recording parameter to TRUE.
Periodic triggering
Periodic triggering means that the recorder automatically makes a recording at certain
time intervals. The user can adjust the interval with the
Periodic trig time parameter.
If the value of the parameter is changed, the new setting takes effect when the next
periodic triggering occurs. Setting the parameter to zero disables the triggering
alternative and the setting becomes valid immediately. If a new non-zero setting needs
to be valid immediately, the user should first set the
Periodic trig time parameter to
zero and then to the new value. The user can monitor the time remaining to the next
triggering with the
Time to trigger
monitored data which counts downwards.
8.2.2.3 Length of recordings
The user can define the length of a recording with the Record length parameter. The
length is given as the number of fundamental cycles.
According to the memory available and the number of analog channels used, the
disturbance recorder automatically calculates the remaining amount of recordings
that fit into the available recording memory. The user can see this information with the
Rem. amount of rec
monitored data. The fixed memory size allocated for the
recorder can fit in two recordings that are ten seconds long. The recordings contain
data from all analog and binary channels of the disturbance recorder, at the sample rate
of 32 samples per fundamental cycle.
The user can view the number of recordings currently in memory with the
Number
of recordings
monitored data. The currently used memory space can be viewed
with the
Rec. memory used
monitored data. It is shown as a percentage value.
1MRS758755 A
Section 8
Measurement functions
REC615 and RER615 593
Technical Manual