Overview
The ZN63(VS1)-12 indoor fixed high-voltage vacuum circuit breaker is a three-phase AC 50Hz indoor switching device with a rated voltage of 12kV, intended for control and protection of industrial mines, power plants, substations and electrical installations, and suitable for frequent-operation sites. The operating mechanism and the breaker body are integrated; the design can be used as a fixed installation unit or with a dedicated trolley mechanism to form a withdrawable unit. The main circuit may adopt an integrally encapsulated pole to achieve a compact, highly reliable and maintenance-free breaker, and it can be fitted in KYN28A-12 (GZS) central-mounted withdrawable switchgear; the fixed type is also suitable for XGN series fixed switchgear. The ZN63(VS1)-12 vacuum circuit breaker offers a compact, maintenance-free design well suited to KYN28A-12 and XGN switchgear assemblies.
Type Designation
Normal Service Environment
1. Ambient temperature: not higher than 40°C, not lower than -10°C (storage and transportation allowed at -30°C).
2. Altitude: not exceeding 1000m. At higher altitudes the rated insulation level shall be increased accordingly.
3. Relative humidity: daily average not greater than 95%; saturated vapor pressure daily average not greater than 2.2×10³ MPa, monthly average not greater than 1.8×10³ MPa.
4. Seismic intensity: not exceeding magnitude 8.
5. Sites free from fire, explosion, severe pollution, chemical corrosion and violent vibration.
Outline and Mounting Dimensions
Technical Parameters
For the ZN63(VS1)-12 vacuum circuit breaker, the normal service environment is as described above, and the main technical parameters are listed in the table below. The ZN63(VS1)-12 vacuum circuit breaker is available with rated currents of 630 A, 1250 A and 1600 A, with rated short-circuit breaking currents of 20/25 kA, 31.5 kA and 40 kA respectively, and a 4 s rated short-time withstand current matching the breaking current.
| No. | Item | Unit | Data | ||||
|---|---|---|---|---|---|---|---|
| 1 | Rated voltage | kV | 12 | ||||
| 2 | Rated maximum operating voltage | kV | 12 | ||||
| 3 | Rated current | A | 63 | 6301250 | 12501600 | ||
| 1250 | 16002000 | 20002500 | |||||
| 25003150 | 31504000 | ||||||
| 4 | Rated short-circuit breaking current (rated thermal stabilizing current, r.m.s.) | kA | 20/25 | 31.5 | 40 | ||
| 5 | Rated short-circuit making current (peak) | kA | 50/63 | 80 | 100 | ||
| 6 | Rated peak withstand current (rated dynamic stabilizing current, peak) | kA | 50/63 | 80 | 100 | ||
| 7 | Rated short-time withstand current (4s) | kA | 20/25 | 31.5 | 40 | ||
| 8 | Rated power-frequency withstand voltage (before/after breaking) / 1 min | kV | 42 to ground (48 across open gap) | ||||
| Rated lightning impulse withstand voltage (peak, before/after breaking) | 75 to ground (85 across open gap) | ||||||
| 9 | Rated short-circuit duration | 4 | |||||
| 10 | Rated operating sequence | O-0.3s-CO-180s-CO | |||||
| 11 | Mechanical endurance | times | 20000 | ||||
| 12 | Number of rated short-circuit breaking operations | times | 50 | ||||
| 13 | Rated closing voltage of operating mechanism (DC) | AC, DC110, 220 | |||||
| 14 | Rated opening voltage of operating mechanism (DC) | AC, DC110, 220 | |||||
| 15 | Contact gap | mm | 11±1 | ||||
| 16 | Over-travel (contact spring compression) | mm | 3.5±0.5 | ||||
| 17 | Three-phase open/close bounce time | ms | ≤2 | ||||
| 18 | Contact closing bounce time | ms | ≤2 | ||||
| 19 | Average opening speed | m/s | 0.9~1.2 | ||||
| Average closing speed | m/s | 0.5~0.8 | |||||
| 20 | Opening time | at maximum operating voltage | s | ≤0.05 | |||
| 21 | at minimum operating voltage | ≤0.08 | |||||
| 22 | Closing time | 0.1 | |||||
| 23 | Main-circuit resistance per phase | uΩ | 630≤50 | 1250≤45 | |||
| 24 | Allowable cumulative contact wear thickness | mm | 3 | ||||
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