Farady Electric / Product / Indoor Switchgear / VB4 Series Vacuum Circuit Breaker

VB4 Series Vacuum Circuit Breaker

VB4P 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.,

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Detail

General

VB4P 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 VB4P terminal buffer guarantees the indoor terminal is ever more reliable in nay operation environment. VB4P can fully meet the requirement of GB, DL, IEC, DIN, VDE as well as standards of other advanced industrial countries.

Service Environment

a) Air temperature: Maximum temperature: +40℃; Minimum temperature:-25℃

b) Humidity: Monthly average humidity 95%; Daily average humidity 90% .

c) Altitude above sea level: Maximum installation altitude: 2500m

d) Ambient air not apparently polluted by corrosive and flammable gas, vapor etc.

e) No frequent violent shake

Main Technical Specifications

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	31.5
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

Note: For short circuit breaking current & rated current is optional by clients.

3D Mechanism Introduction

① Secondary circuit plug

② Mechanism tank

③ Modular Mechanism

④ Anti jump Integrated PCB board

⑤ Tulip contact

⑥ Embedded pole

⑦ Contact arm

⑧ Shutter driver

⑨ Racking trolley

Innovative Product Design

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. Besides, the bellows in vacuum interrupter are avoided to be broken down due to contacts over bounding and also the mechanical lifetime of operating mechanism is ensured.

Special Design of Repair Without Many Tools

During the design for VB4P circuit-breaker, the installation and repair must be taken into account. So for the disassembly of parts or accessories, users need no special tools and the repair becomes more convenient. Besides, all of the secondary controlling components are in front of the operating mechanism, which also make maintenance and repair convenient.

Modularized Operating Mechanism
Modularized operating mechanism is another feature of VB4P. It can be divided into closing module, opening module, mainaxis module and secondary wiring module, which make the mechanism have characteristic of standard manufacture method, short producing period, convenient maintenance and rapid replacing. These modules are standard and applicable to all VB4P so the costs of facilities management and maintenance are reduced.

Self-lubricative Bearing Without Oil
Self-lubricative bearing without oil used for VB4P circuit-breaker is very applicable to over-load and low-speed conditions and avoids the lost-lubricative phenomena due to oil-lubricative bearing out of work for a long time. The free-maintenance can be realized accordingly.

Conductors with Silvered Surface
All the conductors of VB4P circuit-breaker are disposed by silvered process so that it do not only reduce the contacting resistance but also improve 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 also lengthened.