--
ANALYZER OF THE QUALITY OF ELECTRIC POWER SUPPLY
QNA-303 --
Page
6
The different information recorded by the
QNA-303
into its on-board
memory is distributed between three file types:
•
*.STD files: This file contains all values which are periodically
recorded (voltage, frequency, voltage harmonic distortion and the
harmonic content).
•
*.EVE files: File which contains all incidents referred to the
QNA-303
itself (file readout, setup modification, memory erasure, power
supply on/off, battery on/off...).
•
*.EVQ: This file contains all events observed in the electric power
supply (voltage dips, voltage swells, interruptions) together with
some supplementary information about these events (instant of the
event occurrence, maximum/minimum voltage, average voltage,...).
2.2.- Electrical features
The application of the
QNA-303
as a recording instrument for the evaluation of
the quality of the electrical power supply implies the need that this analyzer must
deliver a high protection degree against severe electrical conditions:
•
Protective devices in voltage inputs: Special type fuses able to withstand
short-term pulses, which considerably increases the instrument efficiency.
•
High-energy varistors for the absorption of surges in order to avoid
possible costly repairs.
•
Noise filters in voltage and current inputs to assure reliable measurements
even under most adverse operation conditions.
•
Power supply: transformers with an over power dissipation and insulation.
•
Power supply by built-in battery to assure a voltage supply to the
QNA-303
in case of voltage loss failure.
•
Insulation transformers to guarantee the proper insulation of inputs.
•
Enclosure: The case made of aluminium casting provides a great
mechanical toughness, but also an exceptional shield against external
electromagnetic fields which might appear in extreme situations. Logical
and measuring boards are placed inside a separated zone which even
increases the screening of sensitive components by “Faraday’s cage”
effect.
