Description
ZW7 40.5kV Outdoor Vacuum Circuit Breaker Overview
The ZW7 is an outdoor vacuum circuit breaker for 40.5 kV systems. The published technical table lists 1,250 A and 1,600 A rated-current options, 50/60 Hz operation, and 21 kA or 31.5 kA short-circuit breaking-current options.
The existing structure description identifies an integrated pole, current transformer, operating mechanism, and enclosure. Local opening and closing are supported, and the page describes an intelligent-control combination for remote operation and status transmission.
Operating Conditions
- Ambient air temperature: -30°C to 60°C
- Maximum altitude: 2,000 m
- Maximum wind speed: 34 m/s
- External vibration or ground motion should be negligible
- Pollution level: Class IV
- Storage temperature: -40°C to 85°C
Electrical Ratings
| Parameter | Published value |
|---|---|
| Rated voltage | 40.5 kV |
| Rated current | 1,250 A / 1,600 A |
| Rated frequency | 50 / 60 Hz |
| 1-minute power-frequency withstand voltage, wet/dry | 80 / 95 / 95 kV as listed |
| Lightning impulse withstand voltage, peak | 185 kV |
| Rated short-circuit breaking current | 21 kA / 31.5 kA |
| Rated short-circuit making current, peak | 63 kA / 80 kA |
| Rated peak withstand current | 63 kA / 80 kA |
| 4-second short-time withstand current | 21 kA / 31.5 kA |
| Rated short-circuit breaking operations | 30 |
| Mechanical life | 10,000 operations |
| Mechanism control voltage | AC/DC 220 V |
| Secondary-circuit 1-minute withstand voltage | 2 kV |
Application and Selection
The page identifies load-current, overload-current, and short-circuit-current switching in outdoor power systems as intended duties. Confirm rated current, short-circuit level, operating sequence, control voltage, current-transformer requirements, installation altitude, wind conditions, and pollution level.
Information for an Inquiry
Provide the system current, required short-circuit rating, operating sequence, control supply, current-transformer requirements, installation altitude, ambient-temperature range, wind speed, and pollution conditions.
FAQ
Which rated-current options are listed for the ZW7 40.5kV breaker?
Which short-circuit breaking ratings are listed?
What control voltage is specified?
What outdoor conditions are listed?
What information is needed for selection?
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