beautypg.com

Data acquisition – Siemens ISGS SG8158-00 User Manual

Page 53

background image

Data Acquisition

Siemens Energy & Automation, Inc.

47

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.

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.

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.

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

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)

7

isv3o_1.bk : isv3odaq.frm Page 47 Wednesday, August 7, 1996 10:51 AM