Description
66kV 69kV 72.5kV outdoor HV SF6 circuit breaker is a high voltage electric transmission and equipment which is normally used in power grid system. It can open/close the rated current and fault current for realizing protection. It adopts latest design which has great quality for a long service life.
Environment Conditions:
1.Ambient temperature: -40℃--+ 50℃
2.Wind pressure:≤700 pa
3.Altitude:≤3000m
4.Seismic intensity:≤9degrees
5.Air polluted degree: level Ⅲ
Technical data
| Item |
Unit |
Technical Data |
| Rated voltage |
kV |
72.5 |
| Rated frequency |
Hz |
50 |
| Rated current |
A |
3150 |
| Rated short circuit breaking current |
Short circuit current |
kA |
31.5 |
| DC component |
|
40% |
| Duration of rated short time withstand current |
s |
4 |
| Rated short time withstand current |
kA |
40 |
| Rated short circuit making current (peak) |
kA |
100 |
| Rated peak withstand current |
kA |
100 |
| Rated 1 min power frequency withstand voltage (effective value) |
To earth |
kV |
140 |
| Breaking isolation |
160 |
| Rated lighting impulse withstand voltage (peak value) |
To earth |
200 |
| Breaking isolation |
220 |
| 5 min zero air pressure withstand voltage (effective value) |
To earth, Breaking isolation |
75 |
|
| Rated out of phase breaking current |
kA |
Ie×25% |
| Breaking current of fault at close zone |
Ie×90%,Ie×75% |
| Rated line charged breaking current |
A |
50 |
| Rated operation sequence |
|
O-0.3s-CO-180s-CO |
| Constant of first opened pole |
|
1.5 |
| Closing time |
ms |
≤145 |
| Opening time |
≤60 |
| Breaking time |
≤60 |
| Closing-opening time |
60 |
| Symmetrical time of opening |
3 |
| Symmetrical time of closing |
5 |
| Rated pressure of SF6 gas (20℃） |
Mpa |
0.5 |
| SF6 annual leakage rate |
|
≤0.5% |
| Water content |
ppm (v/v) |
≤150 |
| Potential of wireless radio interference |
μV |
≤2500 |
| Mechanical life |
times |
6000 |
| Mass of each other |
kg |
1200 |
| Mass of SF6 for each breaker |
6 |
| Resistance of main circuit in each pole |
μΩ |
≤80 |
