GE Multilin W650 Instruction Manual page 150

5.2 PRODUCT SETUP
Function Permission (Function): Enabling this setting allows to create an oscillography record when the "TRIGGER
Trigger Position:
Samples/Cycle:
Maximum Number of Oscillos (Max. Number Osc.): 1 to 20 oscillography records can be selected. The capacity of each
Automatic Overwrite:
Snapshot Events:
EXAMPLE
For a Max. Number Osc. of 4, each record will store 1Mbyte / 4 = 262144 bytes.
Therefore, the number of samples per oscillography record is 262144 bytes / 38 bytes = 6898 samples per stored oscillo.
5
If we set the relay to 64 samples per cycle, each record will store up to 6898 / 64 = 107.78 signal cycles. This value
expressed in terms of time would be:
5-10
OSCILLO" signal is activated.
This setting defines the prefault data (in percentage) stored every time a new oscillo is
produced.
This setting defines the number of samples per cycle stored in each oscillography
record. Please see the example below.
record is = 1Mbyte / Max. Number Osc. This capacity is divided in 38 bytes (9
measurements * 4 bytes/measurement + 2 digital bytes) per stored sample. Please
refer to example below.
This setting allows chained oscillographies during the fault (TRIGGER OSCILLO signal
activated). The maximum allowed value to be stored as a chained oscillography is 1
Mbyte. In this case, even if the trip continues during a time longer than the associated
1 Mbyte of memory, the relay will stop storing the oscillography in RAM memory until
the complete record has been saved in non-volatile memory. The oscillography
module will be reset once the data has been completely stored in Flash memory and
the TRIGGER OSCILLO state is deactivated.
This setting enables or disables snapshot event generation for the oscillography
element.
For 50 Hz: 107.78 cycles x 20 ms/cycle =2.155 seconds.
For 60 Hz: 107.78 cycles x 16.67 ms/cycle =1.796 seconds.
W650 Wind Generator Protection System
5 SETTINGS
GEK-113032A