Investigation and modeling of the inrush current generated by the capacitors switching in two modes the presence of current limiting inductor and its absence

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشگاه شاهد تهران دانشکده فنی و مهندسی گروه مهندسی برق قدرت

2 دانشکده فنی و مهندسی، دانشگاه صنعتی اراک، مرکزی، اراک، ایران

چکیده

Inrush current is a transient current that flows when capacitors are initially switched on. This high magnitude current can pose various issues, such as affecting circuit breakers, causing voltage dips, and damaging the capacitors themselves. Therefore, it is essential to investigate and understand its characteristics. When a current limiting inductor is present in the circuit, it restricts the flow of the inrush current by limiting its rate of rise. This helps in reducing the peak magnitude of the current and its potential harmful effects. The inductor adds impedance to the circuit, which slows down the rate of change of current. On the other hand, in the absence of a current limiting inductor, the inrush current can flow with full force, reaching high peak values. Switching in high-voltage capacitive banks used to control voltage and reactive power at high-pressure substations usually results in significant inrush currents and transient states. The riots in the waveform cause damage to the power system and capacitive banks. In this way, it reduces the life of capacitive units or, if it continues, causes complete failure of capacitive banks. The use of current-limiting inductors in capacitive banks reduces the transient time in capacitive banks at the moment of switching and reduces the inrush current. In this paper, we use MATLAB Simulink to investigate the switching effect for a 20 kV capacitor bank with a capacity of 4.8Mvar, first without current-limiting inductor, and then with it and compare their results.

کلیدواژه‌ها


عنوان مقاله [English]

Investigation and modeling of the inrush current generated by the capacitors switching in two modes the presence of current limiting inductor and its absence

نویسندگان [English]

  • Ali Yazdani Baghmaleki 1
  • Asad Shemshadi 2
1 Shahed University of Tehran
2 Faculty of Electrical Engineering, Arak university of technology, Markazi, Arak, Iran
چکیده [English]

Inrush current is a transient current that flows when capacitors are initially switched on. This high magnitude current can pose various issues, such as affecting circuit breakers, causing voltage dips, and damaging the capacitors themselves. Therefore, it is essential to investigate and understand its characteristics. When a current limiting inductor is present in the circuit, it restricts the flow of the inrush current by limiting its rate of rise. This helps in reducing the peak magnitude of the current and its potential harmful effects. The inductor adds impedance to the circuit, which slows down the rate of change of current. On the other hand, in the absence of a current limiting inductor, the inrush current can flow with full force, reaching high peak values. Switching in high-voltage capacitive banks used to control voltage and reactive power at high-pressure substations usually results in significant inrush currents and transient states. The riots in the waveform cause damage to the power system and capacitive banks. In this way, it reduces the life of capacitive units or, if it continues, causes complete failure of capacitive banks. The use of current-limiting inductors in capacitive banks reduces the transient time in capacitive banks at the moment of switching and reduces the inrush current. In this paper, we use MATLAB Simulink to investigate the switching effect for a 20 kV capacitor bank with a capacity of 4.8Mvar, first without current-limiting inductor, and then with it and compare their results.

کلیدواژه‌ها [English]

  • Capacitor Bank
  • Inrush Current
  • Current-limiter Inductor