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Ignitors and Ballasts
133
TECHNICAL
Maintenance-Free Long
Service Life Ballasts
The choice of insulating materials and
their operating temperatures determine
the ballast life. Hella ballasts use class H
insulation materials which are designed for
temperatures up to 180°C, thus ensuring
maximum service life.
The permitted maximum working temperature
of the winding is designated ‘tw’. The
adherence to this temperature guarantees an
average life of 10 years continuous usage. If
the temperature in application is lower, then
the life is correspondingly higher.
Hella HID ballast windings are designed
and constructed using Class H insulation
materials, the tw130 or in OG models tw150
rated winding ensuring maximum service life.
In normal operation in a 40°C ambient
temperature, probable service life of more
than 50 years could be expected.
The graph below shows the theoretical
service life of an Hella HID ballast. Even
when arduously operated at the maximum
recommended temperature, more than 10
years service life can be expected. Every 10°C
over maximum winding temperature of 130°C
or 150°C halves ballast life. The winding
temperature is the ambient temperature plus
∆t, the temperature rise, which is a function of
ballast power consumption.
The high quality and reliability of insulated
conductors is dependent not only on the
production process, but also on the choice of
raw materials.
Many years of experience, both as a user
and manufacturer of enamelled winding
wire has given Hella the knowledge and
expertise to select the best raw materials from
internationally approved suppliers.
Critical attention is paid to the enamel as the
material utilised to insulate the conductor.
Choice of enamel is a key factor and is
linked both to the enamelling system as well
as the electrical, mechanical and technical
characteristics of the finished product.
Special features of Hella HID ballasts:
100% final testing
• very short magnetic paths
• continuity
• transverse laminations with no stray field • winding short circuit
junctions
• core to coil high voltage
• short heat paths
test
• winding insulation Class H materials
• operating values
• vacuum impregnated core and coil
• long service life
• low power consumption
• tw150 winding temperature rating
• fully automatic production technology with
assured manufacturing procedures and quality