ZW7-40.5 Outdoor high-voltage vacuum circuit breaker is for alternating current of rated voltage of 40.5kV for outdoor installation, and for service frequency of 50Hz. Spring operation mechanism can be remote controlled or manual controlled for opening/closing. The design is in accordance with GB1984-89 High Voltage Circuit Breaker and IEC-56 High Voltage Circuit Breaker. ZW7-40.5 vacuum circuit breaker is mainly used for control and protection of outdoor power transmission systems of rated voltage of 35kV, as well as used for normal operation and short-circuit protection for users like distribution networks for city, country, and enterprises. The whole structure of this product is divided by two parts, the up porcelain is fitted with vacuum interrupter, and the down unit is supporting porcelain. This product is suitable for frequent operations, having the advantages of good air tightness, resistance to high temperature and pressure, no hazard of explosion and selfignition, easy installation and maintenance.
Model and Meanings
1. Rated Short-circuit breaking current (kA)
2. Rated Current (A)
3. Rated Voltage (kV)
4. Design Code
5. Outdoor Type
6. Vacuum Circuit Breaker
| No. | Item | Unit | Parameter | ||
| 1 | Rated voltage | kV | 40.5 | ||
| 2 | Rated frequency | Hz | 50 | ||
| 3 | Rated current | A | 630 1250 | ||
| 4 | Rated Insulation level | 1 min Power frequency withstand voltage | Dry | kV | 95 |
| Wet | 80 | ||||
| Lighting impulse withstand voltage (Peak) | 185 | ||||
| 5 | Rated short-circuit breaking current | kA | 20 25 31.5 | ||
| 6 | Rated short-circuit making current | 50 63 85 | |||
| 7 | Rated short time withstand current | 20 25 31.5 | |||
| 8 | Rated peak withstand Current | 50 63 85 | |||
| 9 | Rated short-circuit lasting time | S | 4 | ||
| 10 | Rated short-circuit breaking current breaking time | Times | 20 | ||
| 11 | Rated capacitor bank breaking current | A | 400 | ||
| 12 | Rated operation sequence | C-0.3s-C/O-180s-C/O | |||
| 13 | Full breaking time | s | 0.1 | ||
| 14 | Life expectancy on mechanical operation | Times | 10000 | ||
| 15 | Moving contact allowable abrasion thickness | mm | 3 | ||
| 16 | Weight | kg | 1100 | ||
Working Conditions
Altitude: ≤ 2000m
Ambient temperature: -45℃ - +40℃
Wind speed: ≤ 35m/s
Degree of contamination: IV
Place of Installation: none chemical hazard
Earthquake strength: Level 8
Structure Description
Circuit breaker is mainly consisted by vacuum interrupter, current transformer, and transmission mechanism.
The whole structure of circuit breaker is supporting porcelain bottle, three-phase gang control, current transformer and operation mechanism that all sealed into a water proofed enclosure (Heater is installed for moisture proof). Circuit breaker can be motor or spring operated.
Circuit breaker is fitted into up porcelain bottle, the space between vacuum interrupter and porcelain bottle is filled with latest dielectric material in order to be condensation proofed. The vacuum interrupter contact opening distance and closing distance can be measured through drilled hole in the medium aluminum holder.
1. Upper Cable Outgoing Terminal
2. Vacuum Interrupter Porcelain Bottle
3. Hand Hole Cover
4. Lower Cable Outgoing Terminal
5. Supporting Porcelain Bottle
6. Current Transformer
7. CT17 Mechanical Enclosure
8. Viewing Window (Closing/Opening)
9. Lifting Holes
10. Insulation Tie Rob
11. Arm
12. Holder
1. Upper Cable OutgoingTerminal
2. Vacuum Interrupter Porcelain Bottle
3. Hand Hole Cover
4. Lower Cable Outgoing Terminal
5. Supporting Porcelain Bottle
6. CT
7. Viewing Window (Closing/Opening)
8. CT18BN Mechanical Enclosure
9. Lifting Holes
10. Insulation Tie Rob
11. Arm
12. Holder
1. Upper Cable Outgoing Terminal
2. Vacuum Interrupter Porcelain Bottle
3. Hand Hole Cover
4. Lower Cable Outgoing Terminal
5. Supporting Porcelain Bottle
6. CT
7. Viewing Window (Closing/Opening)
8. CT18BN Mechanical Enclosure
9. Lifting Holes
10. Insulation Tie Rob
11. Arm
12. Holder
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