## 6 Experimental Results  
As a result, there was an overstepping in the normally permissible limits of the 11 th and 13 th harmonic components; however, it was within the permissible limits. According to the Operational Log, the transfer from the local operation mode of the GTPS \"Ilychevskaya\" to parallel operation with the main power system was carried out during this period (27 July from 2:30 pm to 3:35 pm). The switching moment is shown in Figure 1.  
Figure 1: The PQI profile from 27 July 9:00 am to 27 July 10:00 pm: (**a**) coefficient of the 11 th harmonic component, (**b**) coefficient of the 13 th harmonic component, (**c**) THD, and (**d**) phase voltage in the secondary measuring circuit. It can be seen that mode-to-mode switching increases in the level of harmonic components. In local mode, the harmonic components in the measurement nodes are practically absent (the values of the harmonic component coefficient are less than 0.2%). It can be seen that after switching from the local mode of the GTPS \"Ilyichevskaya\" to the parallel mode with the main network, the coefficient of harmonic components increases significantly (up to 1.5%). We can conclude that the source of a short-term overstepping of the normally permissible limits of the harmonic components is modes switching, and the source of long-term fixed disturbances is located in the main power system (cell 11 in Scheme 1). During the PQI registration at the GTPS \"Ilyichevskaya\", voltage dips and swells were recorded. Depth and duration of the voltage dips are shown in Tables 1 and 2. Values and duration of the voltage swells are shown in Table 3.  
Measurement of current loads and power flows by the FLUKE-435 (connected to the 0.4 kV busbar of the LM-3) was performed in the period from 22 July 11:00 pm to 25 July 4:00 am with a sampling rate of 0.5 s. During the period under review, current changes from 1295 to 2570 A were recorded at the moments of operation of the LM-3. It should be \begin{table}
\begin{tabular}{c c c c} \hline \hline  & \multicolumn{2}{c}{**From 27 July to 28 July**} & \\
**Parameter** & **L1** & **L2** & **L3** \\ \hline Quantity & 5 & 7 & 5 \\ -/ - sum & & 17 & \\ Maximum depth, \% & 89.38 & 89.86 & 89.24 \\ Maximum duration, ms & 20 & 10 & 20 \\ \hline \multicolumn{4}{c}{**From 28 July to 29 July**} & \\
**Parameter** & **L1** & **L2** & **L3** \\ \hline Quantity & 1 & 2 & 1 \\ -/ - sum & & 4 & \\ Maximum depth, \% & 72.83 & 84.69 & 85.31 \\ Maximum duration, ms & 660 & 1250 & 350 \\ \hline \hline \end{tabular}
\end{table} 
Table 1: Voltage dip registration results at busbar-2. \begin{table}
\begin{tabular}{c c c c} \hline \hline  & \multicolumn{2}{c}{**From 30 July to 31 July**} & \\
**Parameter** & **L1** & **L2** & **L3** \\ \hline Quantity & 1 & 0 & 0 \\ -/ - sum & & 1 & \\ Maximum depth, \% & 87.59 & 0.00 & 0.00 \\ Maximum duration, ms & 10 & 0 & 0 \\ \hline \multicolumn{4}{c}{**From 2 August to 3 August**} \\
**Parameter** & **L1** & **L2** & **L3** \\ \hline Quantity & 2 & 1 & 2 \\ -/ - sum & & 5 & \\ Maximum depth, \% & 83.59 & 88.41 & 89.66 \\ Maximum duration, ms & 20 & 10 & 10 \\ \hline \hline \end{tabular}
\end{table} 
Table 2: Voltage dip registration results at busbar-1. \begin{table}
\begin{tabular}{c c c c} \hline \hline  & \multicolumn{2}{c}{**From 2 August to 3 August**} & \\
**Parameter** & **L1** & **L2** & **L3** \\ \hline Quantity & 0 & 2 & 0 \\ -/ - sum & & 2 & \\ Maximum depth, \% & 0.00 & 1.35 & 0.00 \\ Maximum duration, ms & 0 & 90 & 0 \\ \hline \hline \end{tabular}
\end{table} 
Table 3: Voltage swell registration results at busbar-1. noted that the current consumption of the LM-3 has some unbalance, which causes current in the neutral conductor (up to 51 A). In addition, current fluctuations in individual phases were recorded (a decrease in current in L1 at 02:10 on 25 July by approximately 20 A for half an hour), which, due to the absence of voltage changes at a given time, may be due to switching of individual resistive elements of the LMs.