++++GeneralVD4 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 VD4 terminal buffer guarantees the
indoor terminal is ever more reliable in nay operation environment.
VD4 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
shake++++ Main technical specificationsNoItemUnitParameter1Rated
voltagekV12/17.5242Rated frequencyHz50/603Rated currentA630,
...4000A41min Power frequency withstand voltagekV48655Lightning
impulse withstand voltagekV75/95125/1506Rated short circuit
breaking current (peak)kA50/63/80/1007Rated active load and close
circuit breaking currentA63508Rated short breaking currentkA20,
…409Rated short circuit making current (peak)kA50/63/80/10010Rated
cable(line) charging breaking currentA50 and 1011Rated capacitor
bank switching currentA40012Rated withstand current
(peak)kA50/63/80/10013Short time withstand current (4s)kA20,
…4014Mechanism lifetimes10000Note: For short circuit breaking
current & rated current is optional by clients. ++++Advanced
techniques and capabilities The circuit-breaker
VD4-12(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
VD4-12(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 VD4-12(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
VD4-12(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 VD4-12(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 VD4-12(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 VD4-12(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. All of the mechanism's
surface of circuit-breaker VD4-12(24) is disposed with special
process and lubricative technique. Not only the rust-resistance
capability is improved but also the operating performance is
ensured. The circuit-breaker is also applicable to humid and hot
regions. The circuit-breaker VD4-12(24) has been through the
whole type test in accordance with the standards of GB and
IEC. ++++Innovative product designDamper with
perfect performanceThanks to the refined damper with perfect
performance andthe new cam gear with curvilinear design, the
contacts reboundingvalue during the breaker opening is reduced more
and thebreaker can be opened reliably. Besides, the bellows in
vacuuminterrupter are avoided to be broken down due to contacts
overbounding and also the mechanical lifetime of operating
mechanismis ensured.Special design of repair without many
toolsDuring the design for VD4 circuit-breaker, the installation
andrepair must be taken into account. So for the disassembly
ofparts or accessories, users need no spe
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