Summary
Our new products, NVS1-12 series indoor high-voltage vacuum circuit breakers are used for switchgears in 12kV power system, as a control and protection unit of electrical equipments in industrial and mining enterprises, power plants and substations. Due to the special advantages of the vacuum circuit breaker, it is especially suitable for frequent operations requiring rated working current, or places where the short-circuit current is broken multiple times. The circuit breaker adopts the integrated design of operating mechanism and circuit breaker body. The two are a front and back structure, which is with reliable interlocking function. The circuit breaker can be used as a fixed installation unit. It can also be equipped with a chassis truck into a hand cart unit.
Product standards
GB/T1984-2014 High voltage AC Circuit Breaker
JB/T3855-2008 3.6-40.5kV indoor AC High voltage vacuum circuit breaker
DL/T403-2000 12kV-40.5kV high voltage vacuum circuit breaker ordering technical conditions
IEC62271-100:2008 High Voltage Switchgear and Controlgear Part 100: AC Circuit-breakers
Environmental Conditions
Ambient temperature: -15 C ~+40C
O Ambient humidity: Daily average relative humidity < 95%
Daily average vapour pressure < 2.2X10MPaMonthly average relative humidity < 90%Monthly average vapour pressure < 1.8x10%MPa;
O Altitude ≤ 1000m;
O Earthquake intensity < grade 8:
O Installation spot: The spot should have no waterlosion danger, seriouspollution, chemical corrosion and exquisite shake.
Main Technical Parameters
| Item | Unit | Data |
| Rated voltage | kV | 12 |
| Rated frequency | Hz | 50 |
| Rated 1 min power frequency withstand voltage (phase to phase, to earth, fracture) | kV | 42 |
| Rated lightning impulse withstand voltage (phase to phase, to earth, fracture) | kV | 75 |
| Rated operation sequence | O-t-CO-t’-CO |
| Item | Unit |
NVS1-12 |
||||||||||||
| Rated current | A | 630 | 1250 | 1250 | 1600 | 2000 | 2500 | 1250 | 1600 | 2000 | 2500 | 3150 | 3150 | 4000 |
| Rated short circuit breaking current | kA | 20 / 25 | 31.5 | 40 | 50 | |||||||||
| Rated short circuit making current (peak) | kA | 50 / 63 | 80 | 100 | 125 | |||||||||
| Rated duration of short circuit | s | 4 | 4 | 4 | 4 | |||||||||
| Rated short circuit breaking times | time | 50 | 50 | 30 | 20 | |||||||||
| Mechanical life | time | 20000 | 20000 | 20000 | 10000 | |||||||||
Note:
20/25/31.5kA, t=0.3s t’=180s
40/50kA, t=180s, t’=180s
4000A VCB need forced air cooling
| Item | Unit | Data | ||||
| Clearance between open contacts | mm | 9±1 | ||||
| Overtravel | 3.5±0.5 | |||||
| Three phase opening and closing asynchronism | ms | ≤2 | ||||
| Contact closing bounce time | ms | ≤2 (50kA) | ||||
| Contact pressure of closing contacts | N | 20kA | 25 kA | 31.5 kA | 40 kA | 50 kA |
| 2000±200 | 2400±200 | 3100±200 | 4250±250 | 5500±300 | ||
| Average opening speed | m/s | 0.9~1.3 | ||||
| Average closing speed | 0.4~0.8 | |||||
General Structure Drawing and Installation Size (unit: mm)
