A nonlinear inductive shunt can be used to protect the longitudinal-capacitive compensation units: CPCs from overvoltages when the current in the circuit increases. Strict calculation of network operation modes with the installation of longitudinal CPC compensation in this case is quite a difficult task ...

Distribution networks of potash mines are characterized by a large length of outgoing cable lines b kV and high power of consumers, which causes voltage deviations at the terminals of electrical consumers over 10% ...

Keeping in mind the feasibility of longitudinal and transverse compensation in underground networks of potash mines, we will analyze the modes of operation of the mine distribution network, typical for the production association "Beloruskali" ...

Installations of longitudinal-capacitive compensation CPC for prevention of undesirable modes sometimes it is expedient to shunt by inductive nonlinear element ...

Voltage losses due to the large length of mine distribution networks, prevent the normal operation of electric drives of mining machines and mechanisms. One of the effective means of compensation of voltage losses, and hence a means of ensuring normal operation of electric motors in such networks, is longitudinal capacitive compensation. Its application, however, is complicated by self-excitation of induction motors. The effect of self-excitation can be so significant that normal operation of electric motors, despite compensation of voltage losses, will be impossible ....

When an unloaded transformer is switched on through the capacitors of the CPC longitudinal compensation unit, undamped resonant oscillations can occur in the circuit. The frequency of these oscillations is usually 1/3 of the mains frequency (in case of subharmonic resonance) or equal to the mains frequency (in case of ferroresonance of voltages). Resonant oscillations are known to be accompanied by a sharp increase in transformer magnetizing current and overvoltages both on the CPC itself and on the transformer ...

The installation of longitudinal compensation (LCC) of voltage losses in the distribution network of the mining site was first tested in production conditions at one of the sites of the Kirov mine of the Slantsy Combine in 1964. In the experimental operation of the CPC proved the feasibility and efficiency of automatic voltage regulation by series capacitors in the network of the site. Inclusion of the longitudinal compensation unit allows to get voltage increase at the longwall face distribution point by 20-25% at engine starts and by 10-15% at nominal load ...