Combined transformer part
The transformer body is closely matched with the fuel tank and has a fixing device. The high-voltage indoor door is equipped with an electromagnetic lock and a charged display. When the high-voltage side is electrified, the high-voltage room door cannot be opened, and the outer door of the box transformer is equipped with a mechanical lock. The high-pressure porcelain bottle and load switch are installed separately for easy operation. All the high and low leads adopt soft connections. The tap leads and the no-load tap changer are cold-welded and fastened with bolts. All connections (including coils and backup fuses, plug-in fuses, load switches, etc.) are used Cold pressure welding, the fastening part is equipped with self-locking and anti-loosening measures. The transformer can withstand the vibration and bumps of long-distance power transmission. After sending it to the user's installation site, there is no need to carry out the conventional lifting core inspection.
●10KV class combination change
The high-voltage backup current-limiting protection fuse is used in series with the plug-in overload protection fuse to provide full range protection for the transformer. The high-voltage current-limiting protection fuse is used as short-circuit protection of the transformer, and the plug-in overload protection fuse is used as the protection of the overload and small fault short-circuit current of American power transformers and other power equipment.
●35KV class combination change
A new type of high-voltage current-limiting fuse for full-range protection is used. It can reliably break any fault current between the current that causes the melt to melt and the rated breaking current. It uses a current-limiting fuse with higher The breaking capacity, rather than the current-limiting fuse, has better low-current protection characteristics. Combining the different characteristics of the two types of fuses, the combination is a whole to obtain good characteristics of full range breaking.
Use environmental conditions
●The altitude does not exceed 2000m;
●Ambient temperature range: -40C~ +45C;
●Outdoor wind speed does not exceed 30m/s;
●Relative humidity: the daily average value is not more than 95%, and the monthly average value is not more than 90%;
●Installation location: Install in a place where there is no fire, explosion hazard, serious pollution, chemical corrosion and severe vibration. ●The waveform of the power supply voltage is approximately sine wave, and the three-phase power supply voltage is approximately symmetrical;
※Beyond the above normal use environmental conditions, the user can negotiate with the factory to solve.
|Rated voltage||kV||6 10 35|
|Max working voltage||kV||6.9 11.5 40.5|
|Power frequency withstand voltage
between poles to earth/isolating distance
|kV||32/36 42/48 95/118|
|Lightning impulse withstand voltage
betwwen poles to earth/isolating distance
|kV||60/70 75/85 185/215|
|Rated current||A||400 630|
|Rated short-time withstand current||kA||12.5(2s) 16(2s) 20(2s)|
|Rated peak withstand current||kA||32.5 40 50|
|LV||Rated voltage||V||380 200|
|Rated current of main circuit||A||100-3200|
|Rated short-time withstand current||kA||15 30 50|
|Rated peak withstand current||kA||30 63 110|
|Number of branch circuit||/||1∽12|
|Short-circuit impedance||%||4 6|
|Scope of brance connection||/||±2*2.5%±5%|
|Connection group symbol||/||Yyn0 Dyn11|