insulation condition
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High Voltage ◽  
2021 ◽  
Author(s):  
Fuping Zeng ◽  
Haotian Li ◽  
Hongtu Cheng ◽  
Ju Tang ◽  
Yilu Liu

2021 ◽  
Vol 55 (2) ◽  
pp. 253-261
Author(s):  
Vilius Malažinskas ◽  
Renaldas Raišutis ◽  
Alfonsas Morkvėnas ◽  
Saulius Gudžius ◽  
Audrius Jonaitis ◽  
...  

High-voltage transformers are among the most important elements in an electric-power system. Each one of them is affected by various external factors: overvoltage, partial discharge (PD), overheating, vibrations, etc., which are created by a strong electric field, thermal effect, humidity, impurities, factory defects, dissolved water and gas in oil-type-transformer insulation. These and other factors, caused by the environment, reduce the life of a device. Thus, the evaluation of the device condition is one of the most important factors for a system-safety evaluation, which ensures a reliable and economical electrical-network operation. This work reviews different contact and non-contact methods, used to evaluate the conditions of transformers by measuring the level of PD. The selected method, i.e., the non-contact measurement of electromagnetic-wave radiation was used to evaluate the voltage-transformer status. The experiment was performed at a 110 kV substation. The authors discuss the efficiency of the selected method to evaluate the voltage-transformer insulation condition.


Author(s):  
Dimosthenis Verginadis ◽  
Jose Antonino-Daviu ◽  
Athanasios Karlis ◽  
Michael Danikas

2021 ◽  
Vol 294 ◽  
pp. 02008
Author(s):  
Yousef Al-Onazi ◽  
Nissar Wani ◽  
Abdulrahman Al-Arainy ◽  
Yasin Khan

Cross-linked polyethylene (XLPE) cables are widely used in the distribution and transmission networks of power systems. The insulation materials of these cables are stressed by the over voltages and are also exposed to various environmental conditions. This leads the power cables to degrade during their normal life span. Therefore, it would be advantageous for the power utilities to acquire the cable’s insulation condition frequently during their operation. In this paper, experimental studies were carried out on short sections of field aged as well as un-aged medium voltage (MV) XLPE cables to investigate the insulation condition using non-destructive diagnostic techniques such as Dissipation Factor (DF), Isothermal Relaxation Current (IRC), and Partial Discharge (PD) characteristics at 60Hz. From this set of experiments, different parameters will be used to analyze the dielectric response and the insulation condition. Finally, the results show how the VLF dissipation factor works efficiently to assess cable aging.


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