Special Features of Hemingray Pin Type
Distribution Line Insulators.
It is generally known and has been proved
repeatedly by standard tests that glass is of great dielectric strength. This
quality is a characteristic of the material. The high dielectric strength of
Hemingray Glass insulators is the result of the basic dielectrical characteristics
of the material of which they are made. This insulating value is permanent -- it
cannot deteriorate with age or condition of service.
The new Hemingray glass possesses the
features of mechanical strength desired in power line insulators. It is unaffected
sudden temperature changes, it does not break easily and because of the many new
design features Hemingray glass insulators will compare favorably in mechanical
strength to that of other types of insulators designed for the same service.
Heat Shock Tested
The heat shock method of testing Hemingray
glass insulators, coupled with a controlled annealing process, insures uniformity
of product and eliminates the insulators that do not meet proper mechanical
Freedom from Deterioration and Aging
Hemingray Insulators are made of a material
which is homogeneous in character, rather than from a substance composed of two or
more materials whose co-efficients of expansion may be different. Hemingray
Insulators being made of glass -- a homogeneous material with but one co-efficient
of expansion -- are not subject to conflicting strains induced by the natural
forces of heat and cold. Hemingray insulators after 40 years of known service are
free from any sign of aging or deterioration.
DESIGN -- Much time
and study have been spent on the design of these new insulators. They are built to
meet the needs of the Electric Light and Power Industry and many engineers of the
larger utilities have co-operated in the development of these new designs.
TRANSPARENCY -- The
new Hemingray line is transparent -- the glass is clear -- reducing inspection
COST -- Hemingray
insulators are low in first cost and low in ultimate cost because of their long
life and negligible maintenance.