Effect of moisture on temperature rise of composite insulators operating in power system

Abstract

The local heating phenomenon of composite insulator has drawn more and more attention gradually. From our analysis, the temperature rise of composite insulator is closely related to the moisture in atmospheric environment according to research results. Effect of moisture on the temperature rise of composite insulators is studied in this paper. The composite insulators, which have operated in power system for a long time and have been detected for local heating, and new insulator are taken as test samples. The temperature rise of operated composite insulators, which have been detected for local heating, increases with the rise of the relative humidity, while new insulator shows no temperature rise can be detected. The temperature rise of sample is not relevant to the core and the interface between core and housing material practically, but the high voltage end housing. The moisture content of the housing material is different at various relative humidity, and this leads to difference in dielectric loss, which is a significant source of local heating phenomenon. The difference of dielectric loss at different relative humidity leads to the temperature rise variation with the relative humidity.

Study on artificial multi‐stress ageing characteristics of composite insulators

“…There was no observable temperature rise at low humidity. The abnormal heating characteristics of the composite insulator obtained in the test were in good agreement with those in [22,23].…”

“…The ɛ′ of water and silicone rubber are 81 and 3-5, respectively, at the temperature of 20°C. As moisture is absorbed into silicone rubber, ɛ′ and tan δ will both increase [23]. According to the test results of dry specimens in Fig.…”

“…In recent years, a large number of composite insulators had abnormal heating in the coastal areas of southern China [17][18][19][20]. Our research group has carried out a systematic study of this phenomenon [21][22][23]. It is proposed that the dielectric loss of the surface layer of silicone rubber under alternating electric field is the main cause of local temperature rise of composite insulators [22,23].…”

“…Our research group has carried out a systematic study of this phenomenon [21][22][23]. It is proposed that the dielectric loss of the surface layer of silicone rubber under alternating electric field is the main cause of local temperature rise of composite insulators [22,23]. To study the development process of abnormal heating of composite insulators in the coastal areas, an improved multi-stress ageing test for composite insulators was proposed.…”

Electrical Equipment Identification Method With Synthetic Data Using Edge-Oriented Generative Adversarial Network

“…Infrared thermography (IRT), due to its attractive characteristics such as high precision and non-intrusiveness, has become an effective tool in preventive maintenance to ensure safety of electric power systems [1]. Infrared images reveal temperature distributions, based on which the identification and analysis of condition of electrical equipment can be performed [2]. However, the conventional inspection methods are time consuming and require well-qualified and experienced personnel for analyzing images.…”