if it is more important to have the latest recordings in the memory. The saturation
mode is preferred, when the oldest recordings are more important.
New triggerings are blocked in both the saturation and the overwrite mode until
the previous recording is completed. On the other hand, a new triggering can be
accepted before all pre-trigger samples are collected for the new recording. In such
a case, the recording is as much shorter as there were pre-trigger samples lacking.
8.2.1.10
Exclusion mode
Exclusion mode is on, when the value set with the
Exclusion time parameter is
higher than zero. During the exclusion mode, new triggerings are ignored if the
triggering reason is the same as in the previous recording. The
Exclusion time
parameter controls how long the exclusion of triggerings of same type is active
after a triggering. The exclusion mode only applies to the analog and binary channel
triggerings, not to periodic and manual triggerings.
When the value set with the
Exclusion time parameter is zero, the exclusion mode
is disabled and there are no restrictions on the triggering types of the successive
recordings.
The exclusion time setting is global for all inputs, but there is an individual counter
for each analog and binary channel of the disturbance recorder, counting the
remaining exclusion time. The user can monitor the remaining exclusion time with
the
Exclusion time rem parameter (only visible via communication, IEC 61850 data
ExclTmRmn) of the corresponding analog or binary channel. The
Exclusion time rem
parameter counts downwards.
8.2.2
Configuration
The disturbance recorder can be configured with PCM600 or any tool supporting
the IEC 61850 standard.
The disturbance recorder can be enabled or disabled with the
Operation parameter
under the Configuration > Disturbance recorder > General menu.
One analog signal type of the protection relay can be mapped to each of the
analog channels of the disturbance recorder. The mapping is done with the
Channel
selection parameter of the corresponding analog channel. The name of the analog
channel is user-configurable. It can be modified by writing the new name to the
Channel id text parameter of the corresponding analog channel.
Any external or internal digital signal of the protection relay which can be
dynamically mapped can be connected to the binary channels of the disturbance
recorder. These signals can be, for example, the start and trip signals from
protection function blocks or the external binary inputs of the protection relay. The
connection is made with dynamic mapping to the binary channel of the disturbance
recorder using, for example, SMT of PCM600. It is also possible to connect several
digital signals to one binary channel of the disturbance recorder. In that case, the
signals can be combined with logical functions, for example AND and OR. The name
of the binary channel can be configured and modified by writing the new name to
the
Channel id text parameter of the corresponding binary channel.
Note that the
Channel id text parameter is used in COMTRADE configuration files as
a channel identifier.
Measurement functions
1MRS757644 H
970
620 series
Technical Manual
