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5-12 750/760 Feeder Management Relay GE Multilin

5.2 S1 RELAY SETUP 5 SETPOINTS

5.2.6 DATA LOGGER

PATH: SETPOINTS Ö S1 RELAY SETUP ÖØ DATA LOGGER

The data logger feature samples and record up to eight (8) actual values at user-defined intervals. This recorded data may

be downloaded to the 750/760PC software for display and diagnostics. All data is stored in volatile RAM memory which

means that the information is lost when power to the relay is lost. Changing any setpoint affecting data logger operation

clears any data that is currently in the log.

The

SAMPLE RATE setpoint select the time interval to record the actual value data. This setpoint multiplied by the number of

samples to accumulate determines the duration of the data log record. For example, if the sample rate is 15 minutes and

continuous mode is enabled then the duration of the data log record is equal to 15 min × 4096 = 61440 min = 42 days.

There are two basic modes of operation defined by the

CONTINUOUS MODE setpoint:

• Continuous Mode: Enabled by setting

CONTINUOUS MODE to "Enabled". At each sampling time the logger will record

the actual value(s) programmed and store them in the log. Up to 4096 data samples per channel will be recorded after

which the oldest data is replaced by newly sampled data.

• Trigger Mode: Enabled by setting

CONTINUOUS MODE to "Disabled". The programmed actual value(s) for up to the last

15 events are recorded, each in a separate buffer. The amount of pre-trigger data that to record is also selectable.

Before the trigger occurs, pre-trigger data is gathered as required. When the programmed trigger condition takes

place, data is collected until the buffer is filled, pre-trigger data collection begins in the next buffer and the relay then

waits for the next trigger. Once all buffers have been filled, the oldest data is overwritten when a new trigger occurs.

The

BUFFER ORGANIZATION and TRIGGER POSITION setpoints are only applicable in trigger mode. The BUFFER ORGANZIA-

TION

selects the number triggers stored and the samples per channel stored for each trigger. For example, "4 x 1024" indi-

cates that the last three triggers with 1024 data samples per channel can be stored in memory. Note that one buffer must

 DATA LOGGER

 [ENTER] for more

SAMPLE RATE:

1 cycle

Range: 1 cycle, 1 second, 1 min., 5 min., 10 min., 15

min., 20 min., 30 min., 60 min.

CONTINUOUS MODE:

Disabled

Range: Enabled, Disabled

BUFFER ORGANIZATION:

16 x 256

Range: 2 x 2048, 4 x 1024, 8 x 512, 16 x 256