On the bus processing machine of distribution transformerwithout refueling science there are several oil-based transformer oil, different types of oil-based principle cannot be mixed, adding a new transformer oil and the body of thetransformer box oil type may not be consistent;Second, at the time of the distribution transformer no refueling outage, causing internal transformer oil mixed hot and cold, the circulating oil flow to accelerate the water cycle from the transformer to the bottom with internal high voltage coil insulation fell short circuit caused by the breakdown;The third is added unqualified transformer oil reactive compensation resonance overvoltage caused by improper to reduce line losses, improve equipment utilization, distribution transformer capacity of 100 kVA or more reactive compensation devices should be used. If the compensation improper line running total capacitance and total inductance equal, ferromagnetic resonance is generated within the lines and equipment operation, causing over-voltage and over-current, burned distribution transformers and other electrical equipment.Lightning over-voltage distribution transformers must be installed according to the requirements of a qualified arresters in high and low pressure side, in order to reduce the lightning over-voltage, magnetic resonance in high and low voltage transformer coils or casing damage.

Secondary distribution transformer secondary short-circuit when a short circuit in the secondary side is higher than the rated current generation times or even several times the short-circuit current, but also in one side while producing a very high current to offset the short-circuit current of the secondary side the demagnetization effect, strong short-circuit current, on the one hand inside the coil of the transformer will have great mechanical stress, resulting in the compression coil, the primary and secondary insulating loose in the deformation of the coil.On the other hand due to the short-circuit current, resulting in a sharp increase in the temperature of the secondary coil, may soon make the transformer coil burned. Bus Machine transformer partial discharge detection methods are generally electric power measurement method.

Use oscilloscope or radio interference analyzer, look discharge characteristic waveform or radio interference level.Ultrasonic measurement method. Appearing in the acoustic wave detector discharge, and the sound waves into electrical signals, recorded on a magnetic tape for analysis, using the transfer time difference between electrical signals and acoustic signals, can be obtained from the detection point to the discharge point.Chemical measurement method. Detection of oil content in a variety of dissolved gases and decrease variation. The test method can be found in the composition of the oil, and the ratio of the number of changes, thereby determining presence or absence of partial discharge (or local overheating). In addition, in recent years has developed a line partial discharge detector, can automatically detect partial discharge in the transformer operation.In order to prevent the occurrence of partial discharge, transformer manufacturing units respond reasonable structural design; careful construction, improve material purity, rigorous treatment of all aspects of quality. Operational units should strengthen transformer maintenance, monitoring, etc., in order to effectively prevent transformer partial discharge.

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