The scope of application of
NH Series Busway refractory fire for the exchange of higher 50 ~
60Hz, rated voltage 660V and below, rated current of 250 ~ 3150A
three-phase four-wire system, three-phase five-wire system for
power distribution system. The use of fire in this series of cases
in a certain period of time been able to maintain power supply to
ensure sufficient time to start fire-fighting equipment,
ventilation pass smoke evacuation, as much as possible to reduce
casualties and property losses. The product is mainly used in
high-rise building, it is important to the control center, Subway
and others flow of public places and other places of higher fire
safety requirements.
1, the basic structure of Bus Basic Structure of Bus
Busway double-shell, good rigidity, strength, strong load-bearing
capacity.
The bus duct with a double layer of shell is good in rigidity, high
in strength and strong in carrying capacity.
2, selected refractory insulation performance
Copper busbar conductor by winding the mica in line with the
JB/T5019.20-85 "electrical insulating mica products" standard. In
normal circumstances the mica tape has good flexibility and high
heat resistance and good dielectric properties, mechanical
properties: bending strength180Mpa, dielectric strength35kV/mm,
volume resistivity> 1010.m. When the temperature reached 600 ℃,
mica tape still has a high insulation performance: insulation
resistance> 10M/mm2.
Bus fire resistance fire resistance in accordance with the
different measures taken by insulating layer is also different, if
the bus power required to run a long time, its direct use of heat
insulation layer of air insulation in general, so as not to affect
operation of the process of mica heat distribution, see (Figure 1),
when the busbar electricity are normally not used only for
emergency power supply, the higher heat limits, insulating layer of
silicon required to fill Figure cotton (2), the bus of choice for
fire-resistant cotton material consistent with silicone GB3003-82
"ordinary aluminosilicate refractory fiber felt" standard, the AL2
O3 + SiO2 content of 96%, continuing the use of a temperature of
1050 ℃, the highest temperature of 1250 ℃.
Busway fire-resistant paint coating shell, when the fire broke out
3 to 5 minutes, the paint began to foam, the expansion of the
formation of insulating layer, thermal conductivity increases
rapidly, effectively reducing the transmission of heat. Generatrix
of the fire-resistant fire-resistant coatings used in the
performance indicators are in line with the GB14907-94 standards.
In order to meet the fire resistance requirements, in which every
block of every block and the joints are made of high temperature
ceramic materials, the ceramic AL 2 O 3 content of more than 95% of
the norm of its dielectric properties, mechanical properties are as
follows: dielectric strength13kV/mm, volume resistivity>
20M.com, bending strength250MPa.
The effect of temperature ceramics significantly, in the
temperature reaches 900 ℃, the measured insulation resistance>
10M.cm. Due to the stability of ceramics, and non-existent problem
of aging of insulating material so as to effectively extend the
life of the bus.
Environmentally friendly products
Busway in the fire situation, without any poisonous gas released
will not form a post-combustion, which is a new generation of
environmentally friendly products.
3, main technical parameters of Main Technical Parameters
NH campaign bus are in line with the performance of IEC439-2,
GB7251.2-1997, JISC8364, GB9978.
Busbar trunking system can withstand the power frequency withstand
voltage 2500V took 1min without breakdown and flashover.
Busway ceramics as a result of the use of high-strength materials
as every other phase so that it can withstand the strong electric
stress and thermal stress.
Busway in the long pass to rated current, the conductive parts of
the temperature rise of less than Table (1) listed ＆#118alues.
