中文
EnglishDetermination of Minimum Allowable Insulation Distance in Rice Cooker Transformer
Release time:
2020-04-23
Source:
Insulation price is an important part of transformer price. In 110 and 220kV high-voltage transformers, the price of insulation can reach 18-25% of the price of the entire transformer. If the insulation gap, the material and size of the insulation structure are not selected properly, these gaps are set too small, which may damage the transformer. If the gap is set larger, insulating materials and other materials will be greatly wasted, and the entire product will be improved. Price. In order to correctly select the structure, material, size and manufacturing technology of the insulation, and correctly determine the length of the effective insulation gap, it is necessary to understandrice cooker transformerThe insulation is affected during operation.
Impact of electricity:rice cooker transformerIt is usually energized during operation, so its insulation is under the influence of the rated working voltage for a long time. He should withstand this voltage without any time limit and without any damage. Inrice cooker transformerThe work of the power system, due to the normal switching operation process or unexpected accident, will lead to transient overvoltage. In rare cases, the overvoltage reaches almost four times the value of the phase voltage. The time of these voltages is measured in 1% seconds and usually does not exceed 0.1 seconds.
The overvoltage of the rated working voltage and the nature of the switching operation mainly affects the main insulation of the coil, that is, the insulation between the ground part of the coil and the other coils.
rice cooker transformerThe main insulation usually uses the same insulating structural components as oil-immersed transformers: insulating paper tubes, corner rings, component partitions, etc. When designing the insulation of dry-type transformers, in addition to ensuring the insulation strength, please pay special attention to ensure that there are enough air cooling pipes between the coils. And pay attention to the placement of the insulating part to ensure that the air can reach the coil most smoothly.
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