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I N S TA L L AT I O N A N D O P ER AT I N G I N S T R U C T I O N S
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17. Capacitive voltage indicators
17.1 Voltage indicator VPIS
VPIS indicators are used to indicate the presence of service
medium voltage
A
.
WARNING!
The indication of VPIS alone is not sufficient to prove
that the system is dead: if operating procedures make it
mandatory, relevant voltage detectors according to IEC
61243-1, IEC 61243-2 and IEC 61243-5 shall be used.
NOTE
The energized state of the unit is indicated by a flashing light with
frequency of repetition of at least 1 Hz. Under very bright lighting it
may be necessary to improve visibility by additional means.
Operating temperature
The VPIS will operate reliably over a temperature range of
–25°C to +50°C.
Phase comparison and testing of VPIS
Each phase of the integrated voltage presence indicating
system has a connection point on the front panel, which can
be used to perform phase comparison and to test the
voltage presence indicator.
Threshold values for voltage presence indication
The indication corresponding to “voltage present” appears
when the actual line-to-earth voltage is between 45% of the
nominal voltage and the rated voltage. The indication
corresponding to “voltage present” does not appear when
the actual line-to-earth voltage is less than 10% of the
nominal voltage.
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Figure 17.1
Capacitive Voltage indicator
A
