VD4 Vacuum Circuit Breaker

No

Item

Unit

Parameter

1

Rated voltage

kV

12/17.5

24

2

Rated frequency

Hz

50/60

3

Rated current

A

630, ……4000A

4

1min Power frequency withstand voltage

kV

48

65

5

Lightning impulse withstand voltage

kV

75/95

125/150

6

Rated short circuit breaking current (peak)

kA

50/63/80/100

7

Rated active load and close circuit breaking current

A

63

50

8

Rated short breaking current

kA

20, …40

9

Rated short circuit making current (peak)

kA

50/63/80/100

10

Rated cable(line) charging breaking current

A

50 and 10

11

Rated capacitor bank switching current

A

400

12

Rated withstand current (peak)

kA

50/63/80/100

13

Short time withstand current (4s)

kA

20, …40

14

Mechanism life

times

10000

The vacuum circuit breaker VD4-12(24) is the newest equipment in the voltage class of 12kV up to 24kV manufactured by Reinron Electric Co., Ltd. It is universally used in power distributing and transforming systems of power stations, power generators, and secondary substations of mines, industries and infrastructures.

It 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 is equipped with a modularized spring operating mechanism which has the characteristics of more convenient maintenance, rapid replacing of parts and more reliable performance.

It uses 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 gives the breaker more reliable insulation.

The embedded poles of 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 rising temperature due to the longtime running of circuit-breaker.

The vacuum circuit breaker has perfect performance when it is breaking short-circuit current or being operated frequently.

It has the functions of automatic reclosing and reliable operation.

The driving mechanisms are designed by professionals in Cooper Nature and with characteristics of reliable closing performance, low impact force and longer lifetime. The mechanical lifetime can be up to 30000 cycles.

The mechanism’s entire surface is disposed with a special process and lubricities technique. Not only is the rust-resistance capability is improved but the operating performance is ensured. Hence, the vacuum circuit breaker is 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.

Back View of VD4-12(24)

VD4-12(24)/T1250

VD4-12(24)/T3150

Damper with Perfect Performance

Thanks to the refined damper with perfect performance and the new cam gear with curvilinear design, the contacts rebounding value during the breaker opening is reduced more and the breaker can be opened reliably. The bellows in the vacuum interrupter avoid being broken down due to contacts over

bounding and the mechanical lifetime of operating mechanism is ensured.

Special Design of Repair Without Many Tools

During the design for VD4 vacuum circuit breaker, the installation and repair must be taken into account. For the disassembly of parts or accessories, users need no special tools and the repair becomes more convenient. All of the secondary controlling components are in the front of the operating mechanism, which makes it convenient

to maintain and repair.

Modularized Operating Mechanism Another feature of the VD4 is the modularized operating mechanism. It can be divided into the closing module, opening module, main axis module and secondary wiring module, which gives the mechanism characteristics of standard manufacture method, short producing period, convenient maintenance and rapid replacement. These modules are standard and applicable to all VD4 so the costs of facilities management and maintenance are reduced.

Self- lubricities Bearing Without Oil

Self-lubricities bearing without oil used for the VD4 vacuum circuit breaker is very applicable to over-load and low-speed conditions and avoids the lost-lubricities phenomena due to oil-lubricities bearing out of work for a long time. Accordingly, free-maintenance can be realized.

Conductors with Silvered Surface

All the conductors of the VD4 circuit-breaker are disposed by silvered process so not only does it reduce the contacting resistance but improves the electricity-conducting capacity of conductors.

Thanks to the reduced resistance, the heat from circuit breaker running can be decreased and the breaker’s lifetime is lengthened.

Double closing spring device

Single closing spring device

Self- lubricities bearing without oil

Conductors with silvered surface

Unique Embedded Poles

Through advanced APG process the vacuum interrupter with small volume and low resistance and the main electrical circuit are cast in an insulating cylinder by epoxy resin. This structure makes the primary electrical circuit isolated with the external environment. Compared with assembled poles, the accessories, conductor joints and fasteners of embedded poles are mostly reduced. All of that makes the assembly simple, avoids the loose fasteners due to vibration during transportation, and improves the product’s reliability. It also protects the external surface of vacuum interrupter from external mechanical impact and environment such as dust, humidity, corrosion or animals. Thanks to the epoxy resin, the poles’ center distance is reduced and accordingly, the overall dimension of the equipped switchgear is reduced. Vacuum Interrupter with Small Volume and Low Resistance

The vacuum circuit breaker VD4 uses a vacuum interrupter with small volume, low resistance and high vacuum degree. When its reshaped contacts are breaking short-circuit current, lengthways there occurs a magnetic field that has characteristics of high breaking capability, small breaking current, low returning probability and rapid insulated recovery. The vacuum interrupter has a long lifetime. Thanks to the one-off sealing and exhausting process, the vacuum interrupter has advanced electric capability and mechanical capability. At the same time, its vacuum degree and other technical parameters all precede national and international standards.

Embedded Pole

Internal Structure of Vacuum Interrupter