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6-21
6.8:
Power
Quality
(CBEMA)
Log
Format
Q
PQ (CBEMA) Log Format: The PQ (CBEMA) Log records in response to surges and sags of
programmed High Speed Limit Triggers on enabled High Speed channels. The information it
provides allows the calculation of duration and magnitude of the surges and sags, as well as
information for locating the start and end of the surge or sag in the Waveform Captures.
Q
Record Format: A Record contains 128 Bytes.
• The first eight bytes in each record is the Starting Time Stamp, representing the time of the last
sample of first cycle of the surge or sag. 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 byte is the millisecond value for the Starting Time Stamp, a binary value in the range of
0 – 9.
• The next four bytes are a bitmap of the States of the High Speed Limits after the triggering
cycle. These bits report the true state of all the limits, regardless of PQ Enable settings.
The first two bytes are for the above limits, shown in the following order:
The other two bytes are for the below limits, and are in the same order as shown in Table 6.10
above.
There are currently five hookups available where the following high speed limits are computable in each:
3 Element Wye V
AN
, V
BN
, V
CN
, I
A
, I
B
, I
C
, I
AUX
3 CT Delta I
A
, I
B
, I
C
, I
AUX
, V
AB
, V
BC
, V
CA
2 CT Delta I
A
, I
C
, I
AUX
, V
AB
, V
BC
, V
CA
2-1/2 Element Wye V
AN
, V
CN
, I
A
, I
B
, I
C
, I
AUX
Broken Delta V
AN
, V
BN
, V
CN
, I
A
, I
B
, I
C
, I
AUX
, V
AB
, V
BC
, V
CA
Table 6.10: Above Limits
Above Limit
_
V
CN
_
486 0151413121110975321
__
V
CA
V
BC
V
AB
V
AN
V
BN
V
AUX
I
A
I
B
I
C
I
AUX
I
N