Meidensha Corporation
Meidensha VCB Dry Air Insulated Dead Tank Vacuum Circuit Breaker

Manufacturer: Meidensha Corporation
Model: VCB
Features

Dead Tank Type VCB optimized for green procurement. It uses dry air for insulation in place of the SF6 which is specified as a greenhouse gas. Our basic design concept is to realize the environmental factors in design (The 3Rs (Reduce, Reuse, and Recycle) + LS (Longuse & Separable)) and life-cycle cost (LCC) reduction as basic concepts.
[Reduce] No use of SF6 gas (a greenhouse gas), reduction of eddy current loss by adopting an aluminum tank, reduction of mass by using aluminum materials, and compact design.
[Reuse / Recycle] Reuse of non-rusting and non-corrosive components (reuse of the aluminum and copper materials)
[Long Use] Longer operational life by adopting the VCB
Long operational life without requiring the repair paint work as it uses the aluminum materials
[Separable] Ease of decomposition and collection (no need to collect SF6 gas by collection equipment , no need for SF6 gas reprocessing)
Applications
36/72/84 kV VCB (for Japan Market ) – compliant with the JEC-2300 Standard (for AC circuit breakers).
36/72.5 kV (for overseas markets ) – compliant with IEC 62271-100-2008 and ANSI C37.06-2009.
Specifications
| Type | NVBOA-30732B | NVBOA-60732BB NVBOA-60832BB | NVBOA-60740BB NVBOA-60840BB | |
|---|---|---|---|---|
| Rated voltage (kV) | 36 | 72.5 | ||
| Withstand voltage | 1 min power frequency (kV rms) | 70 | 140 | |
| 1.2×50μs impulse (kV peak) | 200 | 350 | ||
| Rated frequency (Hz) | 50/60 | |||
| Rated normal current (A) | 2000 | 2000/3150 | ||
| Rated short circuit breaker current (kA) | 31.5 | 40 | ||
| Rated transient recovery voltage | Rate of rise (kV/μs) | 1.19 | 1.47 | |
| First pole to clear factor | 1.5 | |||
| Rated short circuit making current (kA) | 82 | 104 | ||
| Rated short time current (kA) | 31.5 (3s) | 40 (3s) | ||
| Rated breaking time (cycle) | 3 | |||
| Rated opening time (s) | 0.033 | 0.03 | ||
| Make time with no load (s) | 0.05 | 0.10 | ||
| Operating duty | O-0.3s-CO-15s-CO | |||
| Closing control voltage (Vdc) | 48, 100, 110, 125, 250 | |||
| Rated tripping voltage (Vdc) | 48, 100, 110, 125, 250 | |||
| Supply voltage for charging motor | (Vdc) | 48, 100, 110, 125, 250 | ||
| (Vac) | 60, 120, 240 | |||
| Rated dry-air pressure | 0.5MPa-g (at 20℃ ) | |||
| Closing operation system | Spring | |||
| Tripping control system | Spring | |||
| Applicable standard | IEC 62271-100-2008, ANSI/IEEE C37.06-2009 | |||











