马鞍山干式变压器：旧马鞍山干式变压器改制时铁损试验方法

旧马鞍山干式变压器改制时铁损试验方法 　　
马鞍山干式变压器不管作恢复性大修或改造，大都是在原有铁心及外壳的基础上进行的。铁心质量的优劣直接关系到马鞍山干式变压器容量的大小。改造马鞍山干式变压器的首要任务，就是需决定电压等级和容量等.所以必须先准确地将铁损试验出来，才能进行计算工作，其方法如下：
1.完整马鞍山干式变压器的试验方法
这类马鞍山干式变压器大都是在3—6kV等级的线路上正在运行的马鞍山干式变压器，但由于线路要升压为10kV等，而被迫将这些马鞍山干式变压器高压绕组由较低电压改为10kV。这类马鞍山干式变压器的铁损试验方法按正常马鞍山干式变压器空载损耗试验方法进行。

2.马鞍山干式变压器的高压或低压绕组已部分烧坏，但铁心完好时的铁损试验方法
像这类马鞍山干式变压器，不能按第一种方法试验铁损，因为马鞍山干式变压器绕组内已有短路故库存在，若按第一种方法作铁损试验，必然会使损耗增加，试出的铁损结果不能代表该马鞍山干式变压器的真实铁损。遇到这种情况，应首先排除短路故障后(将已短路的绕姐从铁心上拆除)，才能进行铁损试验，排除短路故障的方法，视其短路点的位置不同而采用不同的方法排除，如故障发生在高压绕组或低压绕组，整体绝缘好，此时，可将上铁轭拆除取出故障绕组来(此绕组如是高压绕组的话)，重新将上轭铁装好，按策一种方法试出铁损来。若马鞍山干式变压器容量不大，绝缘又好，此时，可将出故障的高压绕组用钢据小心地锯开拿出来后，按照上述第一种方法试出空载损耗。这种方法的优点是少拆较一次上轭铁。若故障点发生在低压绕组，就应该将高、低压绕组(被损的一相)用钢锯同时锯下，按照低压绕组的匝数，重新绕好临时匝数后，按一种方案试出空载损耗来。

3.马鞍山干式变压器绕组全烧毁时或马鞍山干式变压器绕组绝缘已不能承受作空载损耗试验，但铁心确完好时的铁损试验方法。
像做这类马鞍山干式变压器的铁损试验前，首先必须将全部除去已损坏的高、低压绕姐，单剩一个完好的铁心，绕上临时绕组进行试验。这在实际检修工作中，经常要用这个方法来测试铁损。做这种测试铁损的第一步是，在铁心柱上要绕临时绕组，其绕法是：
配电马鞍山干式变压器的低压侧的端电压大都是，线电压400V，相电压230V Y联结。因为电压不高，所以用厚度为0.5mm的绝缘纸板在铁心上绕一层后即可绕临时绕组。若是高电压时，就要考虑适当增加绝缘厚度。这里需要指出的是，绕临时绕组所选用的线规是该马鞍山干式变压器高压侧所选用的线规即可。

When the restructuring of the old transformer iron loss test method

Transformer, regardless of the restorative overhaul or transformation, mostly on the basis of the original core and shell. The pros and cons of the core quality is directly related to the size of the transformer capacity. The primary task of the transformation of the transformer is required to determine the voltage rating and capacity. It must be accurate iron loss test out in order to carry out the calculation method is as follows:
A complete transformer test methods
Such transformers are running 3-6kV grade line transformer, but due to line boost for 10kV, etc., forced these high voltage winding of the transformer from low voltage to 10kV. The type of transformer iron loss test methods according to the normal transformer no-load loss test method.

(2) high or low voltage winding of the transformer has been partially burned, but the core intact iron loss test
Such as these transformers can not test the first method of iron loss, because the transformer winding has been short-circuit so the inventory in the iron loss test will inevitably increases the loss by the first method, try out the iron loss results can not be the true representatives of the transformer iron loss. In such cases, you should first rule out short-circuit fault (short circuit around the sister removed from the core), in order to iron loss test to rule out short-circuit fault, depending on the short-circuit location of the point and takes a different approach to exclude failure in the high voltage winding or the low voltage winding, the overall good insulation can last a yoke of iron removal remove the fault winding (this winding the case of high voltage winding it), re-upper yoke installed, according to the policy a way The trial and the iron loss. Transformer capacity is small, insulated sound and high voltage winding of steel failure, according to carefully sawn out, in accordance with the above, a way to test the no-load loss. The advantage of this method is less demolition than the one on the yoke. If the point of failure occurred in the low voltage winding, it should be high, the low voltage winding (loss phase) saw off with a hacksaw at the same time, according to the low voltage winding turns, re-winding the provisional number of turns, a program test no-load loss.

Or transformer winding insulation in transformer windings burned the whole can not afford to make no-load loss test, but the core iron loss test indeed intact.
Like to do this type of transformer iron loss test, you must first will be to remove the damaged high and low pressure around the sister, a single left intact core winding around on a temporary experiment. This is the actual repair work, often use this method to test the iron loss. The first step in doing this test iron loss column in the core around the temporary winding, the winding is:
Are the terminal voltage of the low-voltage side of distribution transformers, line voltage 400V, phase voltage 230V Y-links. Because the voltage is not high, 0.5mm thick insulation board around the floor in the core to around the temporary winding. If the high voltage, it is necessary to consider appropriate to increase the insulation thickness. It should be noted that the chosen around the temporary winding wire gauge is the gauge can be chosen by the high pressure side of the transformer.

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