12kV Vacuum Circuit Breaker Drawable
12kV Vacuum Circuit Breaker Drawable
Suit for Substations and Power Distribution/Industrial Facilities/Utility and Power Generation
Benefits: High Efficiency and Reliability/Enhanced Safety/Durability and Longevity
Application
VB-12 Indoor high voltage vacuum circuit breaker is the leading domestic level of a new generation of 12kV vacuum circuit breaker, Its main feature is that the main circuit is installed in the full sealed three-phase insulating cylinder the operation mechanism and the main circuit was of before and after layout The operating mechanism is new- type spring one has the advantages of simple structure, reliable action.
Application range
VB-12 Indoor high voltage vacuum circuit breaker can be widely used in Power plant, power network, metallurgical, petrochemical, city infrastructure such as airports, buildings, subway project.
VD4-40.5 series of indoor high voltage vacuum circuit breaker in the distribution system can be applied to the control and protection of cables, overhead transmission line, transformer, motor, generator,and capacitor bank.
Specifications
Service environment:
a) Airtemperature: Maximumtemperature: +40℃; Minimumtemperature:-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) Nofrequent violent shake
Note: For short circuit breaking current & rated currentis optionalby clients.
| No | Item | Unit | Parameter |
| 1 | Rated voltage | kV | 12 |
| 2 | Rated f requency | Hz | 50/60 |
| 3 | Rated current | A | 630, … 4000A |
| 4 | 1min Power f requency withstand voltage | kV | 48 |
| 5 | Lightning impulse withstand voltage | kV | 79/95 |
| 6 | Rated short circuit breaking current (peak) | kA | 50/63/80 |
| 7 | Rated short breaking current | kA | 20, …31.5 |
| 8 | Rated short circuit making current (peak) | kA | 50/63/80/100 |
| 9 | Rated cable(line) charging breaking current | A | 50 and 10 |
| 10 | Rated single capacitor bank switching current | A | 400 |
| 11 | Rated withstand current (peak) | kA | 50/63/80 |
| 12 | Short time withstand current (4s) | kA | 20, …40 |
| 13 | Mechanism life | times | 10000 |
Test
VB-12 Indoor high voltage vacuum circuit breaker has passed the following tests to ensure the security of operation.
·Type tests: power frequency withstand voltage, lightning impulse withstand voltage,temperature rise, short time and peak withstand current, short circuit current switching capability and current switching test of cable charging.
·Factory routine test: The mechanical performance test, the main circuit power frequency withstand voltage test, auxiliary and control circuit insulation performance test, the main loop resistance test, interlock operation test, mechanical and electrical operation test.
Parameter
| Rated current (A) | Rated short-circuit breaking current (kA) | Width of matching cabinet(mm) | Assorted sizes of moving and fixed contacts | Rated current(A) | Contact plum | The sizes of fixed contact |
| 630～1250 | 20～40 | 800 | 630 | CT-24 | ф35 | |
| 1250 | CT-30 | ф49 | ||||
| 1600 | CT-36 | ф55 | ||||
| 1600～4000 | 31.5～40 | 1000 | 1600A | CT-48 | ф79 | |
| 1600/2000 | CT-64 | ф109 | ||||
| 2500/3150 | CT-82 |
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