HT instruments PQA824 - Manual (Page 78)

PQA400 - PQA823 - PQA824
EN - 77
This page shows the parameters set before recording voltage anomalies:
Fig. 132: Voltage Anomalies
The following non-modifiable parameters are indicated (as they have been set upon
starting the recording).
Nominal Voltage: Nominal voltage.
High Voltage:
Limit high voltage.
Low Voltage: Limit low voltage.
TV: Transformation ratio of the voltage transformers.
This page also shows the total number of voltage anomalies occurred (Number of
Anomalies).
The following keys are active on this page:
 The up and down arrow keys move the cursor alternatively on Type or Phase.
 The
F3 and F4 keys (or the MOD(+) and MOD(-) items on the display) enable
the user to filter the anomalies to be selected. It is possible to select All, Up,
Down, Int (if the cursor highlights Type) and All, Phase1, Phase2, Phase3 (if
the cursor highlights Phase).
 The ENTER key (or the smart icon on the display) confirms the selection
previously made and displays the table of voltage anomalies.
 The ESC key (or the smart icon ) to exit the functions and go back to the
“Anomalies” page (Fig. 131).
5.5.1.4. Fast transient
This page shows a table reporting all transients, i.e. all those phenomena which are
associated to phase voltage, characterized by:
 Fast variations of the voltage waveform slope.
 Exceeding of a limit threshold defined by the user before recording.
Fig. 133: Fast transients