Name
Range
Step Default
Description
Automatically get
recordings
0: Disabled
1: Enabled
-
0:
Disabled
Enables and disables the automatic transfer of recordings. The
recordings are taken from the relay's protection CPU and
transferred to the relay's FTP directory in the communication
CPU; the FTP client then automatically loads the recordings from
the relay and transfers them further to the SCADA system.
Please note that when this setting is enabled, all new disturbance
recordings will be pushed to the FTP server of the relay. Up to six
(6) recordings can be stored in the FTP at once. Once those six
recordings have been retrieved and removed, more recordings
will then be pushed to the FTP.
When a recording has been sent to the FTP server of the relay, it
is no longer accessible through setting tools
Disturbance
recorder
→
Get DR files command.
Recorder digital
channels
0…95 freely
selectable
channels
-
-
Selects the digital channel for recording. Please see the list of all
available digital channels in the section titled "Analog and digital
recording channels".
NO
NOTE!
TE!
The disturbance recorder is not ready unless the "Max. length of a recording" parameter is
showing some value other than zero. At least one trigger input has to be selected in the
"Recorder Trigger" setting to fulfill this term.
Estimating the maximum length of total recording time
Once the disturbance recorder's settings have been made and loaded to the relay, the device
automatically calculates and displays the total length of recordings. However, if the user wishes to
confirm this calculation, they can do so with the following formula. Please note that the formula
assumes there are no other files in the FTP that share the 64 MB space.
Where:
• total sample reserve = the number of samples available in the FTP when no other files are
saved; calculated by dividing the total number of available bytes by 4 bytes (=the size of one
sample); e.g. 64 306 588 bytes/4 bytes = 16 076 647 samples.
•
f
n
= the nominal frequency (Hz).
•
Ch
an
= the number of analog channels recorded; "+ 1" stands for the time stamp for each
recorded sample.
•
SR = the selected sample rate (s/c).
• 200 Hz = the rate at which digital channels are always recorded, i.e. 5 ms.
•
Ch
dig
= the number of digital channels recorded.
For example, let us say the nominal frequency is 50 Hz, the selected sample rate is 64 s/c, nine (9)
analog channels and two (2) digital channels record. The calculation is as follows:
Therefore, the maximum recording length in our example is approximately 496 seconds.
A
AQ
Q-M257
-M257
Instruction manual
Version: 2.07
© Arcteq Relays Ltd
IM00021
401
Summary of Contents for AQ-M257
Page 1: ...AQ M257 Motor protection IED Instruction manual...
Page 2: ......
