Siemens SG8158-00 manual Meter Display, Waveform Capture

Data Acquisition

7.5 Meter Display

The Operating Parameters function allows the user to deter- mine what appears in Line 1 and Line 2 of the Power On Meter display described in Chapter 4.

7000	Operating Parameters
Address	Parameter	Options
7005	LCD Line 1	I avg, Idmd1, Idmd2, Idmd3,
		Idmdavg, V1-2, V2-3, V3-1,
		VLLavg, V1-N, V2-N, V3-N,
		VLNavg, W, WH, Wdmd, VA,
		VAR, VARH, PF, f, I1, I2, I3, IN
7006	LCD Line 2	I avg, Idmd1, Idmd2, Idmd3,
		Idmdavg, V1-2, V2-3, V3-1,
		VLLavg, V1-N, V2-N, V3-N,
		VLNavg, W, WH, Wdmd, VA,
		VAR, VARH, PF, f, I1, I2, I3, IN

The operating parameters can be set to provide you with a quick and constantly updated overview of your most impor- tant data.

7.6 Waveform Capture

The Waveform Capture function sets the pre-trigger time of the two waveform buffers. You can configure the ISGS relay to capture waveforms on a variety of events. For example, waveforms can be captured for protective functions on pickup or trip, or for communication events.

8400	Configure Waveform Capture
Address	Parameter	Range
8401	Wfm1Pretrp	100-900 ms, default is 800 ms,
		(1 ms steps)
8402	Wfm2Pretrp	100-900 ms, default is 800 ms,
		(1 ms steps)

Each buffer stores one full second of data for each wave. This second always includes the event that caused the trip. The pre-trip parameter of each buffer (8401 and 8402) lets you specify where in the buffer the event appears. By setting a time in milliseconds, you indicate how much data of this one second wave data you want included in the buffer prior to the trip.

For example, if buffer 1 is configured to be captured on trip (see also Chapter 5 and its protective functions with wave- form capture), and the activity that led up to the trip is of great interest, buffer 1 can be configured to contain 900 ms of pre-trigger data. These first 900 ms of pre-trigger data represent the signal before the actual trip. The remaining 100 ms show the signal after the trip.

A waveform stored in a buffer will be lost after a loss of con- trol power. Exporting an important waveform immediately to a file will prevent unexpected data loss.

7

Siemens Energy & Automation, Inc. 47