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GEK-106310AB F650 Digital Bay Controller 5-11

5 SETTINGS 5.2 PRODUCT SETUP

5.2.4.2 OSCILLOGRAPHY SETTINGS

These settings (“Setpoint > Product Setup > Oscillography”) are described in Table 5–11:

Table 5–11: OSCILLOGRAPHY SETTINGS

Function Permission (Function): Enabling this setting allows to create an oscillography record when the “TRIGGER

OSCILLO” signal is activated.

Trigger Position: This setting defines the prefault data (in percentage) stored every time a new oscillo is

produced.

Samples/Cycle: This setting defines the number of samples per cycle stored in each oscillography

record. Please see the example below.

Maximum Number of Oscillos (Max. Number Osc.):

1 to 20 oscillography records can be selected. The capacity of each record is = 1Mbyte

/ Max. Number Osc. This capacity is divided in 20 bytes (9 measurements * 2 bytes/

measurement + 2 digital bytes) per stored sample. Please refer to example below.

Automatic Overwrite: 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.

Snapshot Events: This setting enables or disables snapshot event generation for the oscillography

element.

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 / 20 bytes = 13107 samples per stored oscillo.

If we set the relay to 64 samples per cycle, each record will store up to 13107 / 64 = 204.79 signal cycles. This value

expressed in terms of time would be:

For 50 Hz: 204.79 cycles x 20 ms/cycle = 4095.8 ms.

For 60 Hz: 204.79 cycles x 16.67 ms/cycle = 3413 ms.

SETPOINT > PRODUCT SETUP > OSCILLOGRAPHY

Setting Description Name Default Value Step Range

Function Permission Function ENABLED N/A [DISABLED – ENABLED]

Prefault Trigger Position 30 1% [5 : 95]

Samples per cycle Samples/Cycle 64 N/A [4 – 8 – 16 –32 – 64]

Maximum number of oscillos Max. Number Osc. 4 1 oscillo [1 : 20]

Automatic oscillography overwrite Automatic Overwrite DISABLED N/A [DISABLED – ENABLED]

Snapshot Event generation Snapshot Events ENABLED N/A [DISABLED – ENABLED]

GE F650 User Manual

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