EDP SGC Series, User Manual

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6 FUNCTIONS
6.2 VOLTAGE PRESENCE DETECTION UNIT
2.1 DESCRIPTION
The voltage presence detection unit (VPD) processes the voltage analog inputs to asses the presence of
voltage on the line. This is done by the comparison with a configurable threshold, as a percentage of the
configurable nominal voltage.
The VPD also signals the event of “phase open/fail” which signals that the voltage on one or two lines is
below the threshold (no signaling is done when there is no voltage on any phase, as this usually means
the main circuit breaker is open, and is of no indication of phase failure).
The VPD also doubles as a dip/surge detector. The maximum deviation from nominal voltage can be
programmed to activate a signal when the voltage is out of nominal range.
The signals “Voltage Presence Signal” and “Phase Open/Fail Signal” are programmable timed alarms
originated from the after-mentioned algorithms.
2.2 SIGNALS
OUTPUTS
Voltage Presence A Voltage on line A is above threshold
Voltage Presence B Voltage on line B is above threshold
Voltage Presence C Voltage on line C is above threshold
Voltage Presence Voltage on line A/B/C is above threshold
Phase Open/Fail There is no voltage presence on one or two phases
Voltage Presence Signal Timed version of “Voltage Presence” signal.
Phase Open/Fail Signal Timed version of “Voltage Presence Signal”
Swell Voltage Start/Peak/End A Shows the Start, peak and end values of the swell voltage
on line A.
Sag Voltage Start/Peak/End A Shows the Start, peak and end values of the sag voltage
on line A.
Swell Voltage Start/Peak/End B Shows the Start, peak and end values of the swell voltage
on line B.
Sag Voltage Start/Peak/End B Shows the Start, peak and end values of the sag voltage
on line B.
Swell Voltage Start/Peak/End C Shows the Start, peak and end values of the swell voltage
on line C.
Sag Voltage Start/Peak/End C Shows the Start, peak and end values of the sag voltage
on line C.
Table 16: VPD signals.
00110E4
EDP
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