Abstract
With series compensation of the line reactance, the problem of its protection against overcurrents arises regarding relay protection. The greater the degree of compensation, the greater the problem. When compensating for more than 50% of the reactance of the line, the protection of power transmission lines becomes practically impossible due to the failure or false operation of all existing kinds and types of protection [1, 2]. Therefore, as for now, the compensation of the line reactance usually is no more than 50% [3, 4], which does not allow to reveal the full potential of the line in terms of its transmission capacity. The goal of this research was to study the processes occurring in emergency modes on power lines equipped with a series capacitor bank, the understanding of which would help to produce algorithms that can protect power lines with SCB with a degree of the longitudinal resistance compensation of the line of more than 50%.
Highlights
There are several ways to increase the transmission capacity of power lines in the power industry
It was noticed that when the power is directed towards the series compensation device, a greater degree of antiphase of currents is observed at the very first moment rather than when the power is directed from the series compensation device
4) When the capacitance of the SCB is such that during a short circuit, the degree of compensation of the inductive resistance of the line section, located on the capacitor side relative to the short circuit is close to 100%, the currents are at an angle of 90°, and the transient process on the capacitor side is accompanied by a symmetric exponential increase in amplitude
Summary
There are several ways to increase the transmission capacity of power lines in the power industry. The inversion of the current with a short circuit on the line leads to the fact that the currents are not directed to the place of the short circuit (see Fig. 1), but, as it were, in transit past it (see Fig. 2), as a result, the differential and phase comparison protection perceives this damage as external and does not work [11, 12]. For this reason, the reactance compensation of the power transmission line does not exceed 50% [13]
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