GE EPM 9650/9800 Waveform Trigger Log Format, Van, Vbn, Vcn, Ia, Ib, Ic, Iaux, Vab, Vbc, Vca

6.6: Waveform Trigger Log Format

The Waveform Trigger Log stores records in response to High Speed Limit Triggers. It records descriptive information about records in the Waveform Samples Log.

Record Format: A Record contains 256 Bytes.

•The first eight bytes in each record is the Trigger Time Stamp, representing the time of the last sample of the triggering cycle. The format of the Time Stamp is:

Byte		Format	Range	Description
	0	binary	0 – 99	century
1		binary	0 – 99	year
2		binary	1 – 12	month
3		binary	1 – 31	day
4		binary	0 – 23	hour
5		binary	0 – 59	minute
6		binary	0 – 59	second
7		binary	0 – 100	centisecond

Note: This log does not record records during Test Mode.

•The next 48 bytes are 12 4-byte MSB signed integers representing the RMS values recorded in the triggering cycle. The order of these readings is:

VAN VBN VCN VAUX

IA IB IC

IAUX

IN

VAB VBC VCA

There are currently five hookups available, where the following RMS values are computable in each:

3	Element Wye	VAN, VBN, VCN, IA, IB, IC, IAUX
3	CT Delta	IA, IB, IC, IAUX, VAB, VBC, VCA
2	CT Delta	IA, IC, IAUX, VAB, VBC, VCA
2-1/2 Element Wye		VAN, VCN, IA, IB, IC, IAUX
Broken Delta		VAN, VBN, VCN, IA, IB, IC, IAUX, VAB, VBC, VCA

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