VS1-12 withdrawable Vacuum Circuit Breaker 12KV 630-2000A
Voltage: 12KV
Current: 2000A
Breaking current: 20KA
Type: withdrawable
Product overview
VS1-Series circuit breakers are complete independently developed by
Knkong based on the advanced design concept; it adopts a
modularized mechanism, which is easy for installation, maintenance,
testing, and operation. As compared with conventional VS1 circuit
breaker. it features higher operation stability, higher safety, and
extended service life. The product can satisfy customers demand
application in 12kv and 24kV power transmission and distribution
systems, which is extensively applied in such industries as power,
energy, petrochemical engineering, metallurgy, manufacture,
traffic, building, and environmental protection as well as
large-scale enterprises and national key projects
Normal service condition
| Altitude | ≤1000m |
| Ambient temperature | Max | +40℃ |
| Min | -15℃ |
Ambient humidity: Maximum average humidity | 24 hours ≤95% |
| 1 month ≤90% |
| Maximum water vapor pressure | 24 hours ≤2.2kpa |
| 1 month ≤1.8kpa |
Special service condition
For special operating conditions, please consult the manufacturer:
The site altitude exceeds 1000m
-Allows to reduce the dielectric strength of air
-Or order a high prototype circuit breaker, which should meet
Corresponding insulation requirements.
Ambient temperature rise
-Reduced current carrying capacity
-Provide additional ventilation for heat dissipation
Other precautions should be negotiated with the manufacturer
according to section 2.2 of IEC 62271-1
Technical Parameters
| No. | Item | Unit | Parameter |
| 1 | Rated voltage | KV | 12 |
| 2 | Rated frequency | Hz | 50/60 |
| 3 |
Rated insulation level | 1min power frequency withstand voltage(r. m. s) |
KV | 42(phase-to-phase, phase-to-earth) 48(across the isolating distance) |
| Lighting impulse withstand voltage (peak) | 75(phase-to-phase, phase-to-earth) 85(across the isolating distance) |
4 |
Rated current |
A | 630 | 630 | 1250 | 1600 |
| 1250 | 1250 | 1600 | 2000 |
| | 2000 | 2500 |
| | 2500 | 3150 |
| | | 4000 |
| 5 | Rated short-circuit breaking current |
KA | 20 | 25 | 31.5 | 40 |
| 6 | Rated short-time withstand current | 20 | 25 | 31.5 | 40 |
| 7 | Rated short-circuit marking current | 50 | 63 | 80 | 100 |
| 8 | Rated peak withstand current | 50 | 63 | 80 | 100 |
| 9 | Rated duration of short-circuit | s | 4 |
| 10 | Rated operating sequence | | O-0.3s-O/C-180s-O/C |
| 11 | Breaking times of rated short-circuit current | Times | 30/20 times(40KA) |
| 12 | Mechanical endurance | Ops | 20000 |
| 13 | Rated single capacitor bank breaking current |
A | 630 |
| 14 | Rated back-to-back capacitor bank breaking current | 400 |
| 15 | Double-earth fault breaking current | 27.4 |
| 16 | Allowable maximum contact erosion |
mm | 3 |
| 17 | Clearance between open contacts | 10±1 |
| 18 | Over stroke | 3.5±0.5 |
| 19 | Non-simultaneity of 3-phase opening and closing | ms
| ≤2 |
| 20 | Bounce duration of contact closing | ≤2 |
| 21 | Average breaking speed (instant breaking 6mm) | m/s
| 1.1±0.2 |
| 22 | Average making speed | 0.8±0.2 |
| 23 | Making time | ms
| ≤100 |
| 24 | Breaking time | ≤50 |
25 |
Resistance of each phase main circuit |
μ Ω | 630A | ≤50 |
| 1250A | ≤45 |
| 1600A~2000A | ≤35 |
| ≥2500A | ≤25 |
| 26 | Contact breaking bounce amplitude | mm | ≤2 |
27 | Rated operating voltage | Rated operating voltage(V)AC/DC |
V | 24* | 110 | 220 |
| Scope of normal operation voltage | Opening:65%-120% rated voltage, in case the voltage is lower than
30% rated voltage, opening operation is not allowed |
| 28 | Rated voltage of energy storage motor | V | AC110/220,DC110/220 |
| 29 | Energy storage time | S | ≤15 |
Operation safety
With anti-maloperation locking protection these circuit breakers,
working in switchgear cabinets, can realize "five-protection"
interlocking functions, avoiding malapert and maximizing the
protection of an operator's personal safety.
Only when the circuit breaker and earthing switch are in the
disconnected position can the truck of circuit breaker be racked to
the service position from the test position
The circuit breaker can be closed only when in the service/test
position.
With the circuit breaker closed its truck cannot be racked in or
racked out which can be realized only when the circuit breaker is
in the disconnected position.
The circuit breaker in a closed position cannot be racked out from
the service position to the test position.
The circuit breaker cannot be closed while it is being racked in.
When the circuit breaker is closed, if the closing signal fails to
be removed timely, the internal anti-trip control circuit will cut
off the closing circuit to prevent multiple reclosing (optional).
If the electric closing lockout is selected, the circuit breaker
will be unable to be closed when the secondary circuit fails to
provide power or the power provided fails to meet the normal
operation of the locking electromagnet(optional).
