METHOD AND DEVICE FOR AUTOMATIC TUNING A CONTINUOUSLY AND/OR DISCRETELY TUNABLE ARC SUPPRESSION COIL IN THE COMPENSATED NETWORK OF AN ELECTRICAL SYSTEM

摘要

A method for automatic setting an arc suppression coil (9) using an auxiliary signal (14) supplied to the point of zero-sequence component of an electrical system (10). The auxiliary signal (14) is formed by a current or voltage with variable angular frequency and is used for determining the resonant angular frequency ω_rez of the actual state of the electrical system (10) which is compared with the fundamental angular frequency ω_s of the system (10). The arc suppression coil (9) is then tuned towards the desired resonant state L_Srez. The auxiliary signal (14) used for tuning the arc suppression coil (9) may also comprise at least one pair of complementary frequency components with the same size amplitude, the angular frequency ω_i, ω_ii of which is selected so that the value of the response of the electrical system (10) to the auxiliary signal (14 ) is, for both of these complementary angular frequencies ω_i, ω_ii, equally large at the very point of tuning, where the circuitry for the fundamental angular frequency ω_s reaches a resonance state. For tuning the arc suppression coil (9) there is utilized a device (13) including a generator (8) of the auxiliary signal connected to the neutral point of the system (10), an evaluation unit (11), and a control unit (12), wherein the device (13) is provided with hardware and a software module (15) for controlling the frequency of the auxiliary signal (14) and with an evaluation of response of the electrical system (10) for carrying out the method of automatic setting of the arc suppression coil (9) according to the invention.