Summary ROCKWILL® Electric strives to bring our customers the
latest technology and competitive pricing
and best service for distribution automatic.RHB
medium voltage circuit-breakers for outdoor installation use
sulphur hexafluoride gas (SF6) to extinguish the electric
arc and as the insulating medium.Breaking in SF6 gas takes
place without current chopping or generation
of overvoltages.These characteristics guarantee a long
electrical life for the circuit-breaker and limited dynamic,
di-electric and thermal stresses on
the installation.The GSH type of stored energy and free
release mechanical operating mechanism allows opening
and closing operations through local and
remote control.The operating mechanism, the activating
kinematics of the moving contacts and the anti-condensation
heater are located inside a tight metal enclosure which
also acts as the support for the poles.The above-mentioned
structure is supported by a frame made of telescopic metal sections
which allow the height of the circuit-breaker terminal to
be adapted from 2800 mm to 3700 mm.The metal enclosure has IP
54(*) degree of protection and is fitted with a tight door with an
inspection window. The circuit-breaker is compact and
ensures a high level of sturdiness and excellent
mechanical reliability.The enclosure is made out of a steel
plate with adequate surface protection by a special metalising
and painting process. The support structures are hot
dip galvanised. Breaking techniqueThe breaking
principle of RHB circuit-breakers is based on compression and
self-blast technique to obtain top performances at all
breaking current values, with minimum
arc times, gradual arc extinction without chopping, and no
restriking
or switchingovervoltages.This breaking technique - already widely appreciated
and used in high voltage circuit-breakers, has been
introduced into medium voltage with the HM4 series
circuit-breakers for indoor installation. Main
contact separationNo electric arc is struck because the
current flows through the arcing contacts. During its run
downwards, the moving apparatus compresses the gas in the
lower chamber. The compressed gas flows from the lower to the
upper chamber, thereby taking both the chambers to the
same pressure.Arcing contact separationThe current flows
due to the electric arc which has struck between the arcing
contacts. The gas cannot escape through the nozzle because the
hole is still closed by the fixed arcing contact and cannot
even escape through the inside of the arcing contact, because
of the clogging effect of the electric arc.Standards and
serviceThe RHB circuit-breakers comply with the IEC 62271- 100
standard as well as of other major industrialised countries. They
have undergone the tests indicated ensure service safety and
reliability of the apparatus in all installations.The mechanical
and electrical locking devices have been provided to prevent
incorrect operations and to carry out inspection of the
installations while guaranteeing maximum operator
safety. Main technical data Circuit-breaker
on columnRHB-12/24RHB-36RHB-40StandardsIEC 62271-100•••Rated voltageUr [kV]12/243640.5Rated
insulation voltageUs [kV]12/243640.5Withstand voltage at
50 HzUd (1 min) [kV]70 (dry) /60 (wet)95
(dry) /80 (wet)95 (dry) /80 (wet)Impulse
withstand voltageUp [kV]125/150200200Rated frequencyfr [Hz]50-6050-6050-60Rated
normal current (400C)lr [A]125025001250250012502500Rated
breaking capacityIsc [kA]25252525252531.531.531.531.531.531.5Rated short-timeIk [kA]252525252525withstand
current
(3 s)31.531.531.531.531.531.5Making capacityIp [kA]636363636363808080808080Operation sequence[O-0, 3s-CO-15s-CO]•••Opening time[ms]45+1045+1045+10Arcing time[ms]10-1510-1510-15Total
breaking time[ms]55-6055-6055-60Closing time[ms]75+1075+1075+10Overall dimensionson frame3090
- 38403090 - 38403090
- 3840H [mm]L [mm]900900900P [mm]686686686Weight[Kg]900900900SF6
gas absolute pressureRated service
value [kPa]380380550Operating
temperature (1)[0C]-25...+40-25...+40-25...+40TropicalisationIEC:
60068-2-30, 721-2-1•••Electromagnetic compatibilityIEC:
60694,
61000-6-2, 61000-6-4•••Solar radiation[W/m2]100010001000Presence
of pollutionIEC 815 -
table 1Level IIILevel IIILevel IIICreepage distance[cm/kV]2.52.52.75Ice coating[mm]101010Wind speed[m/s]343434Earthquake resistance[g]0.30.30.3Static
force on
the terminalsLongitudinal [N]750750750Transversal [N]500500500Vertical [N]750750750(1)
For lower operating temperatures, please
consult us. /* January 22, 2024 19:08:37
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