ABB TP830 After sales service is provided for the control card of the power supply device

Description

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Upon supply of a lighting installation, for a brief period an initial current exceeding the rated current (corresponding to the power of the lamps) circulates on the
network. This possible peak has a value of approximately 15÷20 times the rated
current, and is present for a few milliseconds according to the type of lighting;
there may also be an inrush current with a value of approximately 1.5÷3 times
the rated current, lasting up to some minutes. The correct dimensioning of the
switching and protection devices must take these problems into account.

Incandescent lamps are made up of a glass bulb containing a vacuum or inert
gas and a tungsten filament. The current flows through this filament, heating
it until light is emitted.
The electrical behaviour of these lamps involves a high peak current, equal to
approximately 15 times the rated current; after a few milliseconds the current
returns to the rated value. The peak is caused by the lamp filament which,
initially cold, presents a very low electrical resistance. Subsequently, due to the
very fast heating of the element, the resistance value increases considerably,
causing the decrease in the current absorbed.

Halogen lamps are a special type of incandescent lamp in which the gas contained within the bulb prevents the vaporized material of the tungsten filament from
depositing on the surface of the bulb and forces re-deposition on the filament.
This phenomenon slows the deterioration of the filament, improves the quality
of the light emitted and increases the life of the lamp.
The electrical behaviour of these lamps is the same as that of incandescent
lamps.
Fluorescent lamps
Fluorescent lamps are a so-called discharge light source. The light is produced
by a discharge within a transparent enclosure (glass, quartz, etc. depending on
the type of lamp) which contains mercury vapour at low pressure.
Once the discharge has started, the gas within the enclosure emits energy in
the ultraviolet range which strikes the fluorescent material; in turn, this material transforms the ultraviolet radiation into radiation which has a wavelength
within the visible spectrum. The colour of the light emitted depends upon the
fluorescent material used.
The discharge is created by an appropriate peak in voltage, generated by a
starter. Once the lamp has been switched on, the gas offers an ever lower
resistance, and it is necessary to stabilize the intensity of the current, using
a controller (reactor); this lowers the power factor to approximately 0.4÷0.6;
normally a capacitor is added to increase the power factor to a value of more
than 0.9
There are two types of controllers, magnetic (conventional) and electronic,
which absorb from 10% to 20% of the rated power of the lamp. Electronic
controllers offer specific advantages such as a saving in the energy absorbed,
a lower dissipation of heat, and ensure a stable, flicker-free light. Some types
of fluorescent lamps with electronic reactors do not need a starter.
Compact fluorescent lamps are made up of a folded tube and a plastic base
which contains, in some cases, a conventional or electronic controller.
The value of the inrush current depends upon the presence of a power factor
correction capacitor:
– non PFC lamps have inrush currents equal to approximately twice the rated
current and a turn-on time of about ten seconds;
– in PFC lamps, the presence of the capacitor allows the reduction of the turnon time to a few seconds, but requires a high peak current, determined by
the charge of the capacitor, which can reach 20 times the rated current.
If the lamp is fitted with an electronic controller, the initial transient current may
lead to peak currents equal to, at maximum, 10 times the rated current.