GeneralVB4 medium-voltage indoor vacuum circuit breaker is
applicable for three-phase AC power system of rated voltage up to
12~24kV and frequency 50/60Hz,widely used in many fields such as
power plant, transformer substation, petrol chemical industry,
metallurgy, manufacturing industry, airport, residential area,
etc., to control and protect the electric equipment, especially, It
is used for the occasion that needs infrequent operation at rated
current or multi-breaking short circuit current, may be mounted in
the indoor air insulating switchgear like type KYN28 or AMS, ABB
type ZS1 series, etc. This circuit breaker is standards as
GB1984-2003 AC high voltage circuit breaker, JB3855 3.6-40.5Kv
indoor AC High voltage circuit breaker, DL/T403 Specification
of 12-40.5Kv indoor High voltage vacuum circuit breaker for order
as well as IEC60694.This circuit breaker is made with mature APG
technology. The application of VB4 terminal buffer guarantees the
indoor terminal is ever more reliable in nay operation environment.
VB4 can fully meet the requirement of GB, DL, IEC, DIN, VDE as well
as standards of other advanced industrial countries. Service
environmenta) Air temperature: Maximum
temperature: +40ºC; Minimum temperature:-25ºCb) Humidity:
Monthly average humidity 95%; Daily average humidity 90% .c)
Altitude above sea level: Maximum installation altitude: 2500md)
Ambient air not apparently polluted by corrosive and flammable gas,
vapor etc.e) No frequent violent shakeDetailThe circuit-breaker
VB4-12(24) is the newest equipment in the voltage class of 12kV up
to 24kV manufactured by Zhejiang Farady Electric Co., Ltd. It is
universal used in power distributing and transforming systems of
power stations, power generators, and secondary substations of
mines, industries and infrastructures.The circuit-breaker
VB4-12(24) has complete type specifications:the rated voltage is
12kV, the rated current is up to 4000A and the rated short circuit
breaking current is up to 50kA.The circuit-breaker VB4-12(24) is
equipped with modularized spring operating mechanism which has
characteristic of more convenient maintenance, rapider replacing of
parts and more reliable performance.The circuit-breaker VB4-12(24)
adopts embedded poles that the vacuum interrupter with low
resistance and the primary main electrical circuit are cast in
insulating cylinders by epoxy resin.This structure makes the
breaker have more reliable insulation.The embedded poles of
circuit-breaker VB4-12(24) have the technique of ventilation and
convection. Besides, the vacuum interrupter is with low resistance.
All of these reduce the power consumption and the temperature
rising due to the longtime running of circuit-breaker.The
circuit-breaker VB4-12(24) has perfect performance when it is
breaking short-circuit current or being operated frequently.Beside
that it also has the functions of automatic reclosing and reliable
operating.The driving mechanisms of circuit-breaker VB4-12(24) are
designed by professionals in CooperNature and with characteristic
of reliable closing performance, low impact force and longer
lifetime. The mechanical lifetime can be up to 30000
cycles.performance is ensured. The circuit-breaker is also
applicable to humid and hot regions.The circuit-breaker VB4-12(24)
has been through the whole type test in accordance with the
standards of GB and IEC.1.Electrical controlThe modular control
circuit board adopts the connection plug with the self-fastening
function, which can ensure the reliability of the electrical
connection. It also has the function of trip-proof and
monitoring.Tripping and closing coils adopt fully sealed structure
to reach strong humidity resistance. The metal shell can
ensure the good electromagnetic shielding.Magnetic blow-out
micro-switch is adopted to ensure the accurate signal
indication2.Closing systemSpecial steel tension spring can ensure
the persistence and steady of the mechanical property.
Self-lubrication beating is adopted to ensure the mechanical life
can reach more than 50000 times. The cam shape is optimized through
rigorous engineering to ensure the excellent output
performance.3.Energy storage systemHigh quality motor can ensure
that the continuous operating life is up to 100,000 hours or
more.The gear transmission structure can avoid the risk of
fracture.4.Holding structureThe integral design of closing holding
and separating brake release can ensure that the structure is
simple and reliable, which can stop the fault of opening and
closing.The latch is casted with high performance steel and matched
with accurate heat treatment process to ensure its long
life.5.Surface treatmentMore than 90% of the component adopt the
electro less nickel-phosphorus plating process and the standard
items are taken stainless steel to enhance the corrosion
resistance, the salt spray test exceed 500 hours.6.Breaking brake
bufferSpecial cushioning mechanism design can buff the impact of
the opening operation effectively.Accurat
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