【摘要】 目前低值(零值)绝缘子检测手段主要有电压分布法、电晕脉冲法、红外热像测温法及超声波法等,但均有一定的不足。文中提出了全新的紫外脉冲法:当线路上存在低值绝缘子时会造成绝缘子串电压分布改变,从而使绝缘子串的放电脉冲数目增加,并引起放电紫外光脉冲的相应变化。在线路杆塔上加装根据文中方法研制的监测装置,对绝缘子串放电脉冲引起的紫外光的185 nm- 260 nm(日盲区)部分进行连续在线监测,分析紫外脉冲的变化,可以发现低值(零值)绝缘子。由紫外脉冲法构成的绝缘子监测系统,不需和绝缘子接触,检测距离可以远达4 m以上,适用于线路绝缘子在线监测。文中方法经过了110 kV线路的实验验证,证实了检测效果。更多还原

【Abstract】 General methods of detecting faulty insulators include the distribution voltage method, the corona pulse current method, the infrared thermal imaging temperature measurement method and the ultrasonic method, etc. They have, however, certain disadvantages. A brand-new ultra-violet (UV) pulse method proposed in this paper, through highly sensitive solar-blind UV detector, can continuously monitor the special wave band of UV pulses of discharge on the surface of insulators online. The UV pulse method to detect the faulty insulator is used because the faulty insulator will increase the number of the insulator string’s discharge pulses. An on-line monitoring system adopting the UV pulse method doesn’t need to have a touch with the insulator, and hence is very suitable for detecting faulty insulators online with the check distance beyond 4 m. The proposed method has been verified by experiments with a 110 kV line insulator.更多还原