Allowed Temperature of Transformers
When transformer is operating, the coil and core generates the copper and iron losses, and these losses turn into heat energy, so that the core of the transformer and the coil temperature rises. If the temperature for a long time exceeds the allowable values then it causes the insulation to gradually lose their mechanical flexibility of insulation aging. During transformer operation when the temperature of each portion is not the same, the maximum temperature of the coil, followed by a temperature of the core, the insulating oil temperature is lower than the temperature of the coil and core. Allowable temperature in the operation of the transformer top oil temperature should be checked.ei core transformer of Class A is in the normal operation, when the ambient air temperature of up to 400C, the limit operating temperature of the transformer windings is 1050C.
Allowable Temperature Rise of the Transformer
Only monitor the upper layer of oil temperature in the running mains isolation transformer, this cannot guarantee the safe operation of the transformer, and must also monitor the temperature difference between the top oil temperature and the cooling air, - that the temperature rises. The temperature of the transformer and the ambient air temperature difference, referred to as the temperature rise of the transformer. A grade insulation transformer, when the maximum temperature is around 400C, the national standards winding temperature rise to 650C, the top oil allowable temperature rise to 550C. The transformer temperature does not exceed the specified value, will be able to ensure safe operation within the specified operating life of the transformer at rated load.
The Overload of the Transformer
The overload stars normal accident loads and overload both cases. Normal overload is caused by the case of the normal power supply, the increase in electricity consumption. Transformer temperature will rise, and resulting in the transformer insulation accelerated aging and reduces the life of, and therefore, under normal circumstances we do not allow the load operation. The special case of the transformer in a short time overload operation, but shall not exceed the rated load in winter 30%, summer shall not exceed 15% of the rated load. In addition, it should be based on the temperature rise of the transformer and specified by the manufacturer to determine the overload capacity of the transformer. When the power system or user substation has an accident, in order to ensure a continuous power supply to the vital equipment, it allows the transformers short time overload operation.
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The article is come from:http://www.chinaphoneparts.com/index.php/daily-maintenance-of-transformers.htm
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