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Design
For detecting the power level, the principle of the capacitive voltage
divider is used. With assistance of the electrical field around the
live core, a capacitor is charged after the alternating voltage has
been rectified. This capacitor discharges periodically over a neon
lamp. The generated light flashes are transmitted by a light mains to
the reading instrument. There the flashes are intensified and evaluated.
If the sequence of the light flashes is between 1 and 5 sec.
(selectable), the voltage indicator will indicate "voltage provided".
In case the voltage breaks down or approaches 0 V AC, the interval of
the flashes becomes longer. If the intervals are longer than 5 sec.,
the indication will be "no voltage provided".
The voltage indicator needs an auxiliary power supply to operate.
The indication at the place of installation and the remote indication
are provided for each core.
A blinking LED indicates " voltage provided". |
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Assembling
a)
surface-mounted instrument
connections
type SPA |
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| power supply:* |
terminal 15
terminal 17
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| relay 1: |
terminal
6
terminal 7
terminal 8
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relay 2:
relay 3:
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terminal 9
terminal 10
terminal 11 |
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relay 3:
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terminal
12
terminal
13
terminal
14 |
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| * according to label on instrument |
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The
sensors have to be mounted with cable ties on the high voltage cables.
It must be ensured that the rated voltage indicated on the instrument
corresponds to the voltage of the switchgear. The reading instrument
(surface-mounted) must be mounted with 2 screws near the place of
inspection, but outside the high voltage area (fig. 1).
The sensors and the reading instrument are connected via light mains.
The standard length of this cable is 1400 mm (other lenghths are
possible on request). The power supply and the remote indication will
be wired according to the wiring diagramme. The mode of power supply is
indicated on the label at the reading instrument.
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b)
panel-mounted instrument
The panel-mounted instrument has to be
inserted into a prepared panel-cutout (dimension of cutout: 92.5+0.8 x
45+0.6 mm). The housing is equipped with clips;
it must be inserted into the cutout and "clipped in" with a light
pressure. |
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Technical Data
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| dimensions: |
sensor:
reading instrument: |
(dia. * H) 40 * 55 mm
(W*H*D) 76*140*42 mm |
| current demand: |
sensor:
reading instrument: |
not necessary
2 mA |
| power supply: |
refer to item B - C - D
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(see Appendix A)
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| load: |
relay contact:
max. contact load:
switching load: |
max. 230 V AC
1 A
max. 50W to 150 W
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