干旱气象 ›› 2019, Vol. 37 ›› Issue (6): 1021-1027.

• 业务技术应用 • 上一篇    下一篇

冀北输电线舞动灾害特征与气象条件分析

王洁,范俊红,赵增保,张彦恒,杨琳晗   

  1. 河北省气象服务中心,河北石家庄050021
  • 出版日期:2019-12-31 发布日期:2020-01-02
  • 通讯作者: 张金满(1977— ),男,高级工程师,主要从事电力、交通等气象研究. E-mail:625728406@qq.com。
  • 作者简介:王洁(1988— )女,工程师,主要从事电力、交通气象服务. E-mail:1107834478@qq.com。

Galloping Characteristics of Transmission Line in Northern Hebei Province and Meteorological Elements Analysis

WANG Jie, FAN Junhong, ZHAO Zengbao, ZHANG Yanheng, YANG Linhan   

  1. Hebei Provincal Meteorology Service Center, Shijiazhuang 050021, China
  • Online:2019-12-31 Published:2020-01-02

摘要: 利用2007—2017年冀北地区38次输电线路发生舞动时的地面观测、探空资料,分析输电线路舞动的时空分布及气象要素特征,得出冀北输电线路舞动的气象要素指标。结果表明:(1)西北部山区舞动事故较东部沿海多,呈略减少趋势,但并不显著,高发时段为4—5月;而东部沿海呈逐年增加趋势,且通过α=0.05的显著性检验,高发时段为11月。11 a来途经沽源、丰宁、赤城境内的沽太I线发生舞动事故最多。(2)输电线路舞动前后,地面气象要素不一定存在高频变化,但舞动发生前需同时到达一定的阈值范围,且在阈值范围内各气象要素可增大、降低或保持不变。(3)输电线路舞动发生时,在700~850 hPa存在暖层或逆温层,在暖层或逆温层及以下,露点温度差基本小于2 ℃,空气中的水汽达到近似饱和及饱和状态,在中高层湿度相对较小。(4)输电线路舞动发生在冻雨、雨夹雪、雨转雪、雪的天气条件下。(5)对舞动气象预测模型进行回报检验,发现能较好地回报出冀北输电线舞动情况,对电网气象服务具有一定指导性。

关键词: 输电线路, 舞动, 时空分布, 气象要素指标

Abstract: Based on conventional observation data during power transmission line galloping processes which happened 38 times from 2007 to 2017 in northern Hebei, the temporal-spatial distribution characteristics of transmission line galloping and the relative meteorological factors were analyzed, and meteorological indices for transmission line galloping were obtained. The results are as follows: (1) The transmission line galloping in the northwest mountainous regions was more than that of the eastern coastal, which showed a slightly decreasing trend, but it was not significant. The high incidence period was from April to May, while in the eastern coastal it showed an increasing trend year by year, and passed the significance test of 0.05. The high incidence period was November. Over the past 11 years, the Gutai I line in Guyuan, Fengning and Chicheng had the most galloping accidents than others. (2) Before and after transmission line galloping, the meteorological factors needn’t have high-frequency changes. However, it was necessary to reach a certain threshold range at the same time before galloping occurrence, and the meteorological factors increased, decreased or remained unchanged in the threshold range. (3) A warmer layer or inversion layer existed near 700-850 hPa when the transmission line galloping occurred, the difference between temperature and dew point temperature below warmer layer or inversion layer was less than 2 ℃, and the water vapor in the air reached near saturation and saturation, the relative humidity was relatively small in the high-level. (4) Transmission line galloping occurred under the weather conditions of freezing rain, sleet, sleet and snow. (5) Based on the historical surface meteorological observation data and sounding data in northern Hebei, the prediction model of galloping weather was tested. It was found that the galloping situation of transmission line in northern Hebei was predicted well, which had certain guidance for the meteorological service of power grid.

Key words: transmission line, galloping, space-time distribution, meteorological factors

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