三明变压器的要技术条件

三明变压器的要技术条件
1.       要有相当大的过负荷能力，过负荷绝缘不能引起损伤。
2.       应限制短路电流等于3~4倍额定电流。
即迥路阻抗≈30%~35%=三明变压器阻抗+电抗器阻抗+短路网路阻抗。
3.       因三明变压器一般都是户内装置安装地点愈近愈好，这是由于三明变压器的变压比大，二次电流亦较大的原因，这样可使从引线到的距离缩小但对散热来讲是不利的，同时又考虑到在炼钢过程中矿石融化时，经常有短路发生，融化后短路又消失，故线圈和油面的******温度都要适当的配合这样运行条件。
4.       根据炼钢的要求，需要在侧能有几个电压等级，因为调压次数的频繁，三明变压器承受内部过电压的次数亦较多，纵绝缘要有足够的强度，并应向客户建议经常检查油质，半年不少于一次。
5.       线圈一般接成d，如果中有电流的振荡（由电抗器限制其振荡）时，增加的电流就可分配在两个相中，如果是三相，还要考虑到由于加料不均匀而引起的各项负荷的不均匀。
 
Main technical conditions of the furnace transformer
 
1 have a fairly large overload capacity overload insulation can not cause injury.
2. Should be limited to short-circuit current is equal to 3 to 4 times the rated current.
Clamp the impedance ≈ 30% ~ 35% = the transformer impedance + reactors impedance + low voltage short circuit network impedance.
. Furnace transformers are generally indoor apparatus installation site closer the furnace better, which is due to a large transformation ratio of the furnace transformer, the secondary current is also larger reasons, so the distance from the low pressure leads to the furnace can be narrow but is disadvantageous in terms of cooling, while taking into account that the melting of the ore in the steelmaking process, often a short circuit occurs, a short-circuit after thawing and disappear, so the coil and the maximum temperature of the oil surface must be appropriate with such running conditions.
4 according to the requirements of the steelmaking, the low voltage side can have several voltage levels, the number of times of the internal over-voltage more because the the regulator number of frequent transformer withstand longitudinal insulation should have sufficient strength, and should customer proposals regular checks of the oil, not less than once in six months.
5. Low voltage coil is generally connected as d, if the oscillation of the current in the electric furnace (from the reactor to limit its oscillation), increasing current can be distributed in both phases, and if it is a three-phase electric furnace, but also taking into due feeding the unevenness of the unevenness caused by the load.