特高压变压器绝缘配合(英文)

Insulation Coordination of UHV Transformers

特高压变压器绝缘的研究和开发应该考虑工作电压的影响。工作电压会严重地影响变压器遭受雷击时产生的过电压。分析了变压器的工作电压对冲击电压强度的影响;指出了雷电冲击试验电压定义下的工作电压对于特高压变压器的必要性;通过研究得出了特高压变压器的主绝缘的最大许用工作电压。研究结果表明用于检查长时间工作电压的长时耐压试验的绝缘能力值限制在1.3～1.5Uphm。

Researches and development of the insulation of UHV transformers should take impact of the operating voltage into consideration. Operating voltage can seriously influence the over-voltage, arising from the transformer under the lightning impulse. Impact of an operating voltage on impulse over-voltage strength in the transformer is analyzed. Necessity of the operating voltage defined by the test voltage of the lightning impulse for UHV power transformers is pointed out. Through researches the maximum permissible operating voltage for the main isolation of UHV transformers is obtained. It is concluded that the value of long-duration test voltage for the examination on insulation capability at long-duration operating voltage should be within the range of 1.3—1.5Uphm.