Exploitation stresses and challenges in diagnostics of electrical industrial equipment

Abstract

Exploitation strategies of electric power and industrial equipment, stimulated mainly by economic and environmental trends, play a crucial role in ensuring uninterrupted power delivery and continuous operation. The diagnostics of industrial equipment is particularly important in this context, due to both operational multistresses and the strive for higher and higher voltage levels as well as due to increasing requirements with respect to safety, security and reliability in electric power and industrial networks. Modern diagnostics is a multidisciplinary domain. The development of power electronics, sensors, optoelectronics, communication, information technology and new materials has a strong influence on new approaches. This keynote will address the challenges and trends of modern diagnostics with a special focus on electric insulation systems exposed to power electronics stimuli. The main challenge nowadays is the proper interpretation of acquired diagnostic information and correlation with physical phenomena and degradation processes. Various complementary methods will be presented along with industrial examples; like the signal and image processing methods applied for assessing pulse diagnostic symptoms coming from stochastic signals of partial discharges in various structures of the insulation systems and high frequency response analysis applied to winding assessment. New challenges caused by electronic converters subjecting and stressing the electric insulation systems with high slew rate and repetition frequency of switching pulses is shown. The noninvasive and non-destructive character of applied methods make them especially attractive for diagnostics and monitoring purposes. Further, from the global perspective, reliability and safety drive the recent trends in industrial diagnostics.

Archives of Electrical Engineering

“…2b). Thus the PD parameters and attributes are modulated/changed by harmonics [17][18][19][20]. The associated PD inception mechanism was discussed above.…”

“…For example, in addition to the electrical method described in IEC standard [15] electromagnetic detection of PD signals using wideband sensors working in the UHF range was also used for investigation of PD generated by a conducting particle in transformer oil [16], and electrical trees in XLPE [17]. For PD testing and assessment of electrical insulating systems, both PD phase-resolved distributions and patterns [18][19][20], as well as the characteristic clusters parameters evaluated by the Pulse Sequence Analysis method [21] are used.…”

Study on the Methodology of Diagnosis for Transformer Winding Insulation Defects

“…Fault diagnosis method for transformer impulse test is a common method of waveform comparison. This method judges whether there is fault through the acquisition of lightning impulse voltage and current transformer winding voltage waveform and then comparing with the normal case of waveform [7]. But this method can only detect insulation failure which is more serious.…”

Partial Discharge Detection and Localization: Using Software-Defined Radio

“…However, these repeated discharges can eventually lead to full discharges that totally destroy the insulating material resulting in catastrophic failures of power equipment, [2]. It is imperative that PD occurrence, modes and types be studied in order to assist in the preventive maintenance and effective management of HV equipment, [1][2][3]. PD can also appear as localized dielectric discharges developing in a secluded area of electric insulation subjected to an electrical field stress.…”