Abstract
In the lightning impulse test, the 10 kV fusion voltage transformer intelligent component acquisition port often suffers from functional failure or breakdown. In this paper, experimental measurement and inversion calculation were used to study the electromagnetic disturbance level of smart component acquisition port. During the inversion calculation, the applicability of the dual exponential function model, Heidler function model, and impulse function model as the primary source for describing the lightning impulse device were compared and analyzed. The results show that the double exponential model was used as the calculation source of the primary side lightning waveform, and the inversion calculation results were in good agreement with the actual measurement. In addition, the effects of the primary side lightning voltage peak, wave head, and wave tail parameters on the maximum amplitude of the disturbance waveform calculated by inversion are discussed and analyzed. Based on the analysis results, a sufficient inversion calculation parameter was proposed to estimate the disturbance level of the intelligent component acquisition port. Finally, the measured results were compared and discussed with the IEC 61439 assessment level, and it was suggested that the assessment level of fusion equipment should be modified.
Highlights
With the development of distribution network automation technology, a large number of fusion type voltage transformer signal acquisition equipment with intelligent sensing, judgment and execution functions are applied to distribution network lines [1]
The inversion calculation results show that the dual exponential function model is used to describe the primary source waveform generated by the lightning impulse generator device
The calculated results are in good agreement with the measured results
Summary
With the development of distribution network automation technology, a large number of fusion type voltage transformer signal acquisition equipment with intelligent sensing, judgment and execution functions are applied to distribution network lines [1]. It is urgent to master the disturbance level of the transient disturbance voltage coupled to the signal acquisition port of intelligent components under the standard lightning voltage assessment, on this basis, effective protection measures are formulated. Many experimental measurement and calculation methods were used to study the impact of lightning power transient signals on secondary equipment. According to the degree of fusion, it is mainly divided into two types: complete equipment and integrated integration equipment Their common feature is that the traditional primary equipment and secondary control intelligent unit are combined and installed locally on the site. This paper focuses on the disturbance level of acquisitional port in the marked part of the figure under the standard lightning impulse
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