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110kV降压变电所电气部分设计英文文献

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来源:https://www.bjmy2z.cn/gaokao
2021-01-26 09:12
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2021年1月26日发(作者:纸垫)

英文文献

Cirtcuit Breakers
A circuit breaker is mechanical switching device capable of making,and breaking
currents
under
normal
circuit
conditions
and
also
g
for
a
specified
time ,and mediujm in which circuit interruption is performed may be designated by a
suitable
prefix,
for
example,air- blastcircuit
breaker,oil
circuit

circuit
breakers currently in use can be dlassified into the following categories according to
the
arc-quenching
principles:air
swetches
oel
ciryit
breakers,minmum-oil
circuit
breakers,air-blast
circuit
breakers,the
magenetic
air
circuit
breakers,minimum-oil
circuit
breakers,aer-blast
circuit
breakers,the
by
voltage,insulation
levelcurrent,interrupting capabilities,transient recovery coltage,interrupting tiome,and
trip

nameplate
on
a
circuit
breaker
usually
indicates:

.The
maximum
steady-state
current
it
can
carry,
2.
The
maximum
interrupting
current,3.
The
maximum line voltage, interrupting time in cycles, The interrupting time in may
last form 3 to 8 cycles on a 60 Hz system. To interrubt large currents quickly, we have
to ensure rapid cooling. High-speed interruption lunits the damage transmission lines
and equipment and, equally important,it helps to mainmain the stability of the system
whenever
a
contingency
occurs.
The
main
parts
of
a
circuit
breaker
are
usually:arc-quenching
chamber
(or
interrupter
with
moving
and
fixed
contacts)
operating mechanism and supporting structures.


Air
Switches-With
increasing
currents
and
voltages,
spring- action
driving
mechanisms
were
developed
to
reduce

contact
buring
by
faster-opening
,main contacts were fitted with arcing contacts of special material and
shape,which opend after and closed before the main r improvements of
the
air
switch
were
the
bursh-type
contact
with
a
wiping
and
cleaning
function,the
insulating
barrier
leading
to
arc
chutes,and
blowout
coils
with
excellent
arc-extinguishing features,as well as the horn gap contact,are still in
use in low voltage as and de breakers.


Oil Circuit Breaker Around 1900, in order to cope with the new requirement
for
“interrupting
capacity”,AC
switches
were
immersed
in
a
tank
of
oil.
Is
very
effective in quenching the arc and establishing the open break after current
grids,oil-blast features,pressure-tight joints and vents,new operating mechanisims,and
multiple interrupter were introucedover several decades to make the oil circuit breaker
a reliable apparatus for system voltage up to 362Kv.


Lingting protection
The thunder and lightning protects to connect the ground; Connect the ground to
avoid the thunder the most important link of the technique, ignore is a shot thunder,
respond the thunder of the thunder or other form, and avoid the thunder work most all
of

send
into
the
earth
the
thunder
electric
current.
Store
the
thunder
energy
to
behave
the
type
to
build
the
,
current
technology
to
still
reach
to
not
arrive,
and
therefore have no the reasonable but good connect the ground equip to is impossible
to speak about to defend the ore say the design, the construction is very
high
standard
to
connect
the
ground
system
is
a
heavy
inside
that
defend
thunder's
work it heavy. High electric potential that For long time, people have an illusion, and
think that connect the ground electric resistance more small avoid the thunder result
and then more like, quilt object that protect safety. Certainly the electric resistance is
more the small is more quick, strike by lightning to reserve time more short, the risk is
more
small,
electric
voltage
of
its
stride,
get
in
touch
with
the
the
electric
voltage
produce the machine too the more the ?But, construction that the fulfillment proof of
near
and
more
than
ten
in
the
last
yearses,
with
its
say
that
connect
the
worth
importance of ground electric resistance, not equal to say that connect the ground to
equip more reasonable, importanceElectricity equipments, demand variety that now's
city, there is lots of in a building inside not the congeniality connect the ground device,
if avoid the thunder to connect the ground, electricity the safety to connect the ground,
AC power the work to connect the ground, correspondence and calculator system to
connect
the
ground,
according
to
the
fulfillment
proof,
totally
use
to
connect
the
ground is an application most for extensive connect the local type. 

That
A,
the
independence
connect
the
ground:
As
above
part
for
demand
for
speak
ofing
connecting
the
ground
of,
all
distinguish
to
independently
establish
the
own to connect the ground system, and this kind of connect the local type to call the
independence to connect the ground. Its advantage is each system and can't result in
the
mutual
interference,
and
this
is
particularly
important
to
correspondences
the adoption independence that network easily were strike by lightninged
is bad, so besides have to defend to explode the dangerous environment requesting to
must want the adoption the independence of avoid the thunder method generally not
lay claim to the way to connect the ground.

Two, totally use to connect the ground: Also call unify to connect the
each system
that it connect
the
ground the demand unifies
to
receive
a connect
the

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