VS1-12 Vacuum Circuit Breaker

 

 

Main Performer Features:

 

A) The secondary control elements are all in front of the mechanism, which is convenient for inspection and maintenance;

B) Modular functional unit design, reasonable structure layout, and easy to maintain;

C) Integrated energy storage handle, convenient for manual energy storage operation;

D) Fewer parts, simple structure, and convenient operation;

E) The cam directly drives the big shaft to rotate, which has high transmission efficiency;

F) New design concept, no need to do fastening adjustment;

G) Long life design, 30000 times mechanical endurance with small current, 20000 times with large current, 10000 times with free maintenance, in keeping with M2 class;

H) The mechanism can be equipped with an assembly-type insulating cylinder or embedded pole-type main circuit components

I). When being used at an altitude of 2000 meters or below, it can meet the insulation requirements without replacing any parts.

J) The product can be directly interchangeable with VD4-12.

 

Environment service condition

A) Altitude: 1000m and below.

B) Ambient temperature: not higher than + 40℃, not lower than - 15℃ (storage and transportation at - 30℃ is allowed).

C) Relative humidity: daily average ≤ 95%, monthly average ≤ 90%, daily average of saturated steam pressure ≤ 2.2×10-3Mpa, monthly average ≤ 1.8 × 10^-3Mpa. Condensation may occur when the temperature drops sharply in the high humidity period.

D) Seismic intensity: no more than 8 degrees.

E) No water drop, steam, combustible gas, fire, explosion hazard, chemical corrosion, and severe vibration.

 

Product structure

 

Main structure

 

The VCB adopts a front and rear structure, VIs were installed in front and operating mechanism is rear, and the main circuit adopts a three-phase earthing structure. This design could make VI match better to the performance of the mechanism, meanwhile, reducing the energy consumption and noise, making the products more reliable.

 

The operating mechanism adopts the spring type of plane layout, with the function of manual energy storage. It is placed in the mechanism chamber, which is in front of the VI. The mechanism chamber of the VCB is also used as the operating frame at the same time.

 

The operating mechanism and the chamber can be assembled separately. The energy storage, closing and opening parts of the mechanism are fewer parts, which is compact, simple and high reliability.

All VCBs with different currents are equipped with dust cover before ex-factory. During actual use, the dust cover doesn’t need to be removed if the rated current is under 1250A, but if over 1600A, considering the cooling problem, the dust cover is required to be removed.

 

 

Technical Parameters and Performance Indicators

The technical parameters of VS1-12 Vacuum Circuit Breaker are as follows:

Technical Parameters	Values
Rated voltage	12kV
Rated current	630A, 1250A, 1600A, 2000A, 2500A, 3150A, 4000A
Rated frequency	50Hz
Rated short-circuit breaking current	25kA, 31.5kA, 40kA, 50kA
Rated short-circuit making current (peak)	63kA, 80kA, 100kA, 125kA
Rated short-time withstand current (4s)	25kA, 31.5kA, 40kA, 50kA
Rated peak withstand current	63kA, 80kA, 100kA, 125kA
Rated insulation level	Power frequency withstand voltage (1min): 42kV <br/> Lightning impulse withstand voltage: 75kV
Rated operating sequence	O-0.3s-CO-180s-CO
Mechanical life	10000 operations
Electrical life	Vacuum interrupter: 20000 operations

Size：

 

 

Vacuum arc extinguishing theory

 

The VI with a cyathiform axial magnetic field is installed in the VCB. The VI is with a high vacuum degree. When the fixed and movable contacts open with charges under the force of the operating mechanism, a vacuum arc between the contacts will appear. Because the fixed and movable contacts have chutes with the same inclination direction, the majority of arc current will be diffused on the circumference of the contacts when the arc current flows and the axial magnetic field between the contacts will be formed. So that the arc will maintain diffused and evenly burning in the surface of the contacts, and maintain a lower arc voltage. When the current passes to zero naturally, the residual ions, electrons, and metal vapour can aggregate or composite on the surface of contacts or shielding cover within microseconds.

 

 

The insulating strength of the dielectric across open contacts of the VI will quickly restore, and the arc will be extinguished, achieving the purpose of breaking. Due to the use of advanced longitudinal magnetic field technology, this kind of arc extinction has a strong and stable current-breaking capacity.

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