Ht-instruments PQA824 Manual de usuario Pagina 135
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PQA400 - PQA823 - PQA824
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10.6. VOLTAGE FAST TRANSIENTS (SPIKES) (ONLY PQA824)
The meter considers all the phenomena associated to the phase voltage as voltage spikes
which have the following properties:
Fast slope variations of voltage waveforms.
Exceeding a limit threshold fixed by user before starting a recording.
The maximum number of recorded events in a half period (10ms @ 50Hz, 8.3ms @ 60Hz)
is 4. The maximum number of recorded events by meter during a recording is 20000.
To better understand the features of this analysis refer to the following picture where a
typical voltage spike at 50Hz frequency is shown:
Fig. 211: Typical voltage spikes at 50Hz frequency
The meter continuously checks the input voltage signals performing 2 simultaneous
routines with different sampling rates. In particular:
SLOW: The signals of input voltage are sampled with a 256 samples/period
rate (20ms @ 50Hz, 16.7ms @ 60Hz).
FAST: The signals of input voltage are sampled at 200kHz frequency.
As soon as an event occurs, the meter automatically checks whether one of the following
conditions are respected:
dV/dt > 100V/5s type of event FAST.
dV/dt > 100V/78s type of event SLOW @ 50Hz.
dV/dt > 100V/65s type of event SLOW @ 60Hz.
- PQA400 – PQA823 – PQA824 1
- PQA400 - PQA823 - PQA824 4
- 2. GENERAL DESCRIPTION 7
- 3. PREPARE TO USE 8
- 4. HOW TO OPERATE 9
- 5. GENERAL MENU 12
- MOD(+) MOD(-) 43
- Generic Plant 47
- CLP/EXP PREDEF. SEL MODIFY 52
- EN50160 62
- VOLTAGE ANOMALIES 63
- HARMONICS 64
- POWER & ENERGY 66
- Missed external adapter 69
- Wrong phase sequence 69
- Negative active powers 69
- Wrong Vref voltage anomalies 69
- 001_2006-09-11 117
- CAUTION 118
- COMPACT FLASH 120
- PQA400-PQA82x 120
- 7. MEASURING PROCEDURES 121
- 8. MAINTENANCE 125
- 9. TECHNICAL SPECIFICATIONS 126
- )tsin(VVv(t) 129
- 11. AFTER-SALE SERVICE 141
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