Ningbo Tianan (Group) Co.,Ltd.
Ningbo Tianan (Group) Co.,Ltd
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33kV Indoor Rmu Ring Main Unit / C - GIS gas insulated switchgear
Service condition:
A. Altitude ≤1000m (above sea level);
B. Ambient temperature: -25ºC~+40ºC;
C. Wind speed ≤34m/s
D. The spot should have no regularly exquisite shake.
On our nation 40.5Kv transmission line, there is still massive adoption of various fuses. For the terminal station especially,because of its low rated current and rated short-circuit current,like "waste one's talent on a pretty job" , far from economy.
Load switch or load switch and fuse composed electric apparatus are widely adopted abroad for its economy, convenience ,safety, and dependability . For our country, SF6 load switch is unavailable on 40.5kV voltage degree. The only choice is using 36kV air load switch from other country,however, its insulation level doesn't meet our nation standard,it still unsuited for the running on our nation grid.
For the above reasons,we developed XGN65-40.5 Indoor HV SF6 Ring main unit.
Technical data
| S/N | Item | Unit | Parameter |
| 1 | Rated voltage: | kV | 36, 38, 40.5 |
| 2 | Rated frequency: | Hz | 50/60 |
| 3 | 1 min power frequency withstand voltage phase-phase,phase -earth/isolating distance : |
kV | 70/80, 70/80, 95/110 |
| 4 | Lighting impulsive withstand voltage phase-phase,phase-earth/isolating distance: |
170/195, 170/195, 185/215 | |
| 5 | Rated current: | A | 630, 1250 |
| 6 | Rated current of fuse: | A | 3.15-50 |
| 7 | Rated short-time withstand current of main circuit, earth circuit : | kA | 20 |
| 8 | Rated short-time withstand current of main circuit, earth circuit : | kA | 20 |
| 9 | Rated short-circuit making current: | kA | 50 |
| 10 | Load switch full capacity breaking times: | times | 100 |
| 11 | Rated short-circuit breaking current of fuse : | kA | 31.5 |
| 12 | Rated transfer current: | A | 1000 |
| 13 | Rated SF6 gas pressure (ambient tempeture20ºC): | Mpa | 0.04 |
| 14 | SF6 gas min. pressure (gauge pressure at 20ºC) | Mpa | 0.02 |
| 15 | Gas annual leakage rate | <0.2% | |
| 16 | Mechanical lifetime : | times | 5000 |
| 17 | Protection degree of gas filled tank | IP | 67 |
| 18 | Protection dgree of mechanism compartment, instrument compartment and cable compartmnet |
IP | 3X |
| 19 | Circuit resistance | ||
| 20 | LBS cubicle | uΩ | 130 |
| 21 | LBS+fuse cubicle | uΩ | 250 |
| 22 | Circuit breaker cubicle | uΩ | 140 |