配电变压器常见故障的判断（Judgement on common faults of distribution transformer）.docVIP

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配电变压器常见故障的判断（Judgement on common faults of distribution transformer）.doc

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配电变压器常见故障的判断（Judgement on common faults of distribution transformer）

配电变压器常见故障的判断（Judgement on common faults of distribution transformer） Judgement on common faults of distribution transformer 1, distribution transformer fault and abnormal phenomenon 1) transformer after outage or try to send the transmission, often found that the voltage is not normal, such as a low or high phase phase indicates zero; some new transformer three-phase voltage is very high, the electrical equipment by the high voltage and burn. 2) high voltage fuse, fuse can not fuse. 3) after the thunderstorm, the transformer can not send electricity. 4) abnormal sound of transformer. As a squeak and crackling crackling sound or wow wow jack jack as frog sounds etc.. 5) the high-voltage terminal is burned out, and the high pressure bushing has serious damage and flashover marks. 6) under normal cooling conditions, the temperature of the transformer is abnormal and keeps rising. 7) oil changes too fast, the oil in carbon. 8) issued a rumbling transformer noise, safety injection outward from the airway, storage cabinet, oil tank and the heat pipe deformation, oil leakage, oil leakage etc.. 2, judge the fault from the noise of transformer When the transformer is powered, the current in the iron heart will produce alternating magnetic flux, alternating magnetic flux through the core continuous continuous hum electromagnetic sound. The electromagnetic sound is proportional to the magnitude of the current. The greater the current, the heavier the sound. The current suddenly increased and the sound suddenly increased; the current stopped and the sound disappeared. Therefore, according to the transformer noise changes, combined with the appearance of inspection, is fully able to judge the nature and location of the internal fault of the transformer. 1) normal and phase absent. When the transformer power supply, the normal situation is: a first phase, because there is no current through the transformer, no sound; when sent to the second phase, due to the high side current loo