Circutor Q20711, User Manual

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3.- ANALYSIS MODES
QNA-P/PV series analyzers can be used in different operating modes
according to their setting.
The most striking features of the analysers are:
•
Measurement and storage in memory of main power quality parameters
(voltage values, flicker, harmonics and unbalance).
•
Measurement and storage in memory of main electrical parameters (voltages,
currents, frequency, power, PF...).
•
Neutral current and Neutral-Earth voltage measurement.
•
Setting a voltage threshold to define different events (voltage sags, voltage
swells and interruptions). Also an optional setting of an hysteresis value for
each individual threshold.
•
QNA-P/PV can carry out quality analyses in 3-wire or 4-wire distribution
systems. All quality measurements will be referred the line-to-neutral or line-to-
line voltage according to selection.
•
QNA-P/PV can also be used to measure through voltage and current
measuring transformers .
4.- DATA STORAGE IN MEMORY (AUTOMATIC MODE)
QNA-P/PV is equipped with an internal date and time clock to store automatic
data recordings and quality events in the memory at regular time intervals..
The QNA-P/PV storage memory is divided into four independent blocks. Each
discrete block is allocated to every file type to be saved. Every file type contains the
following information:
•
*.STD files: This file contains all values which are periodically
recorded (voltage, current, energy, frequency, voltage harmonic
distortion, harmonic content and unbalance…).
•
*.EVE files: File containing all incidents referred to the QNA-P/PV
itself (file readout, setup modification, memory erasure, power
supply on/off, battery on/off...).
•
*.EVQ: This file contains all events observed in the electrical power
supply (voltage dips, voltage swells, interruptions) together with
supplementary information about these events (time of the event
occurring, maximum/minimum voltage, average voltage, voltage
prior to the event).
•
*.H24: This file contains the data required to obtain a statistical
analysis of the harmonic evolution in one day.
•
*.STP: This file stores average values for voltage, frequency, flicker
(pst and plt) and the THD over one week.