ABB 70PR05B-ES Automatic DCS spare parts system

Description

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Halogen lamps
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.