Abstract
The dielectric monitoring/diagnostic tool, such as Polarization and Depolarization Current (PDC) measurement, is now being widely applied to obtain the status of deteriorated transformers around the world. Nowadays, several works have reported that the chemical and electrical-based transformer insulation diagnostic parameters (absorption ratio, polarization index, paper conductivity, oil conductivity, insulation resistance, etc.) can be easily calculated from the PDC data. It is a fact that before using these parameters to obtain the status of deteriorated transformers, the power engineers should prudently investigate the effectiveness of these parameters. However, there are few papers that investigate the important issue. In addition, the understanding of temperature effect mechanism on these parameters should also be prudently studied. In the present work, we firstly prepare several oil-impregnated pressboard specimens with various insulation statuses by using a sequence of thermal ageing and moisture absorption experiments launched in the laboratory, and then the PDC measurement is performed to obtain the chemical and electrical-based transformer insulation diagnostic parameters. Finally, we systematically interpret the effectiveness and temperature effect mechanism on these chemical and electrical-based transformer insulation diagnostic parameters.
Highlights
Power transformers, generally speaking, can be regarded as a ‘heart’ in electric power transmission and transformation area around the world [1]
The increasing requirements to nondestructively and reliably acquire the insulation status in transformers using advanced tools have immensely promoted the development of dielectric response diagnostic techniques, such as Return Voltage Measurement (RVM) [12,13], Polarization and Depolarization Current (PDC) [14,15,16], and Frequency Domain Spectroscopy (FDS) [17,18,19]
This paper reports the understanding and interpretation of the effectiveness and temperature effect mechanism on chemical and electrical-based transformer insulation diagnostic parameters that were obtained from PDC data
Summary
Generally speaking, can be regarded as a ‘heart’ in electric power transmission and transformation area around the world [1]. Several works have reported that the chemical and electrical-based transformer insulation diagnostic parameters (absorption ratio, polarization index, paper conductivity, oil conductivity, insulation resistance, etc.) can be obtained from the PDC data [5,11,16,20,21]. This is a great contribution for reducing the manpower and time cost. These mineral oil specimens can satisfy the standard of ASTM D3487-2000(II)
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