Method to identify operating regimes of asynchronous drivers by subharmonic parameters in mining

The article proposes the protection method for asynchronous drivers in mining based on the identification of starting and self-starting by the presence of subharmonic parameters in transient processes in phase currents and by their absence in emergency modes (short circuits). This principle of functioning allows a priori discrimination between the emergency modes, with action acceleration given there are no subharmonic parameters, and the normal operating modes, with the increased currents of starting (self-starting) but with no protection relay actuation in case of initiation of subharmonics. The outcome of identification of subharmonic parameters in transient processes is the cardinal change of the adjustment procedure of starting and self-starting protectors without increased current-related actuation settings. The algorithm and mathematical formalization are proposed to identify subharmonic components of currents. The modeling of the starting mode and short circuit failure in MATLAB Simulink shows that it is necessary and sufficient to compare amplitudes of phase currents in 5–6 periods to provide correct operation of the proposed method. Accordingly, this method ensures disengagement of drivers in emergency modes in 100–120 ms. Thus, the method makes it possible to enhance the response speed and sensibility of short circuit failure protection in power supply circuits and in coils of electric drivers.

Minakova T. E., Malarev V. I., Korzhev A. A. Method to identify operating regimes of asynchronous drivers by subharmonic parameters in mining. MIAB. Mining Inf. Anal. Bull. 2022;(11):96-108. [In Russ]. DOI: 10.25018/0236_1493_2022_11_0_96.

T.E. Minakova¹, Cand. Sci. (Eng.), Assistant Professor, Minakova_TE@pers.spmi.ru, ORCID ID: 0000-0001-5776-1917,
V.I. Malarev¹, Cand. Sci. (Eng.), Assistant Professor, e-mail: Malarev_VI@pers.spmi.ru, ORCID ID: 0000-0001-7947-2200,
A.A. Korzhev¹, Cand. Sci. (Eng.), Assistant Professor, e-mail: Korzhev_AA@pers.spmi.ru, ORCID ID: 0000-0003-2258-3561,
¹ Saint-Petersburg Mining University, 199106, Saint-Petersburg, Russia.

T.E. Minakova, e-mail: Minakova_TE@pers.spmi.ru.

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