| Functions
of FMD
Prevent transformer explosion and fire.
Extinguish transformer fire by instantly injecting nitrogen.
Cool down transformer oil by nitrogen injection for a
sufficient period to avoid reburning.
Characteristics of FMD
State-of-art concept: rapidly drain oil to prevent explosion
and inject nitrogen to prevent and extinct
fire.
Excellent performance: utilize fast valves to drain oil
in 0.1s with the technic from the national
defense.
Fast response: once a fault signal is detected from the
transformer. The oil is —drained
within 0.2 second after detection in order to release
pressure and to —avoid
explosion. The nitrogen gas is injected for 1 to 20 second
in order to mix —and
cool down the oil, to reduce the concentration of flammable
gases, to isolate —oxygen
gas, and to extinct fire.
High reliability: utilize the principle of logic signal
to prevent any improper or unnecessary activity
to the system and to provide a more flexible system.
High efficiency: able to inject nitrogen gas continuously
for more than 30 min to completely cool down
the transformer oil as well as prevent and extinguish
fire.
Reduce pollution: no environmental pollution due to the
characteristic of nitrogen gas in FMD. Extinct
fire without water is an advantage to the lack of water
area.
Feasibility: easy to install and maintain for both new
or existing transformers.
Reasonable investment: a minor price compare to other
traditional transformer fire extinction systems,
such as water spraying systems and CO2 spraying systems.
Patent right: National Patent Number 02225196.0
Comparisons with Traditional Fire
Extinction Systems
CO2 spraying system: lack of application, big investment,
difficult to maintain, easy to suffocate human.Water
spraying system: large amount of water is consumed; hard
to maintain because the water pipe is rustable and its
lip is easy to be blocked; a large investment
spends on storing water in a tank and collecting water
from underground; required to disconnect electricity
for testing and maintaining
Haloalkane spraying system: unfavorable to environment,
seldom to be used now, and prohibited to be
used worldwide from the year of 2010.
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