EHV AC Undergrounding Electrical Power: Performance and Planning (Power Systems)


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Performance and Planning

Sub Programme – Jicable'19

The no-load steady-state regime has also been investigated: Figure 12 shows the phase current magnitudes along UGC. Since the use of PTs, the behaviours of the three phases are very similar to those derived by means of single-phase positive sequence circuit: therefore, they are visible as a unique curve. Moreover in Figure 13 the screen voltage magnitudes are shown: the induced voltages in the screens are strictly depended upon the inducing phase currents.

Screen voltage magnitudes along the compensated single-circuit cable in CB with PTs at no-load. All the abovementioned situations can be studied also with a single-phase positive sequence model even if the MCA allows a deeper knowledge of the power system. In the following more asymmetrical situations are shown. In order to demonstrate this assertion, Figures 14 and 15 which must be compared with Figures 9 and 10 are shown.

Phase current magnitudes along the compensated single-circuit cable in CB without PTs.

Phase voltage magnitudes along the compensated single-circuit cable in CB without PTs. They represent phase current and voltage magnitudes, respectively, for CB performed without PTs. The behaviours of the three phases 1, 2, 3 are rather different and in the case of Figure 14 the ampacity limit is exceeded by both phase 2 and 3. Another important feature of CB without PTs is the fact that it implies a ground return current, as Figure 16 shows.

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It is worth noting that this current is always present in steady-state operation so that possible electromagnetic interferences could arise with nearby parallel metallic systems. The shunt compensation only at the two ends is possible but it gives wider stretches of ampacity exceeding as Figure 17 clearly shows. In this case, the ampacity is exceeded grey zone by all the three phases and for a long stretch of UGC length. Phase current magnitudes along the compensated single-circuit cable in CB without PTs and compensated only at the two ends as in Figure 1.

The power of the self-made MCA is the applicability to very different systems, e. The single-phase positive sequence analysis can be sufficient for engineering purposes, but the paper has demonstrated that there are some cases i. Moreover, the paper has shown that the shunt compensation only at the two ends is also possible for long UGC, but the use of intermediate shunt compensation stations gives both lower power losses and less wide stretches of exceeded ampacity.

Benato, R. Power Syst. IEC British Electricity International.

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  6. Book Authors Journal Authors. Electrical power has been the technological foundation of industrial societies for many years. Although the systems designed to provide and apply electrical energy have reached a high degree of maturity, unforeseen problems are constantly encountered, necessitating the design of more efficient and reliable systems based on novel technologies.

    The book series Power Systems is aimed at providing detailed, accurate and sound technical information about these new developments in electrical power engineering. It includes topics on power generation, storage and transmission as well as electrical machines. The monographs and advanced textbooks in this series address researchers, lecturers, industrial engineers and senior students in electrical engineering.

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    EHV AC Undergrounding Electrical Power: Performance and Planning (Power Systems) EHV AC Undergrounding Electrical Power: Performance and Planning (Power Systems)
    EHV AC Undergrounding Electrical Power: Performance and Planning (Power Systems) EHV AC Undergrounding Electrical Power: Performance and Planning (Power Systems)
    EHV AC Undergrounding Electrical Power: Performance and Planning (Power Systems) EHV AC Undergrounding Electrical Power: Performance and Planning (Power Systems)
    EHV AC Undergrounding Electrical Power: Performance and Planning (Power Systems) EHV AC Undergrounding Electrical Power: Performance and Planning (Power Systems)

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