ABB TP853 After sales service is provided for the control card of the power supply device

Description

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The functioning of high intensity discharge lamps is the same as that of
fluorescent lamps with the difference that the discharge occurs in the presence
of a gas at high pressure. In this case, the arc is able to vaporize the metallic
elements contained in the gas, releasing energy in the form of radiation which
is both ultraviolet and within the visible spectrum. The special type of bulb
glass blocks the ultraviolet radiation and allows only the visible radiation to pass
through. There are three main types of high intensity discharge lamps: mercury
vapour, metal halide and sodium vapour. The colour characteristics and the
efficiency of the lamp depend upon the different metallic elements present in
the gas, which are struck by the arc.
High intensity discharge lamps require a suitably sized controller and a heating
period which can last some minutes before the emission of the rated light
output. A momentary loss of power makes the restarting of the system and
the heating necessary.
Non PFC lamps have inrush currents of up to twice the rated current for
approximately 5 minutes.
PFC lamps have a peak current equal to 20 times the rated current, and an
inrush current of up to twice the rated current for approximately 5 minutes.

For the selection of a protection device the following verifications shall be
carried out:
– the trip characteristic curve shall be above the turning-on characteristic curve
of the lighting device to avoid unwanted trips; an approximate example is
shown in Figure1;
– coordination shall exist with the contactor under short-circuit conditions
(lighting installations are not generally characterized by overloads).
With reference to the above verification criteria, the following tables show the maximum number of lamps per phase which can be controlled by the combination
of ABB circuit-breakers and contactors for some types of lamps, according to
their power and absorbed current Ib
(
*)
, for three phase installations with a rated
voltage of 400 V and a maximum short-circuit current of 15 kA.