50 years HVDC ABB – from pioneer to world leader

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In 1954, at a time when much of Europe was busy expanding its electricity supply infrastructure
1 Q) D4 ]; e* [3 ?( u2 ]to keep pace with surging demand, an event was quietly taking place on the shores of the Baltic
Sea that would have a lasting effect on long-distance power transmission. Four years earlier, the
Swedish State Power Board had placed an order for the world’s first commercial high-voltage
direct current (HVDC) transmission link, to be built between the Swedish mainland and the island
" a8 l, u' `; O; m2 v0 v" nof Gotland. Now, in 1954, it was being commissioned.-%-97570-%--%-11576-%--%-11570-%-

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Mercury-arc valve based HVDC had come a long way in a short time, but it was a
technology that still harbored some weaknesses. One was the difficulty in predicting the
# P8 E. k# ?* Zbehavior of the valves themselves. As they could not always absorb the reverse voltage,
arc-backs occurred. Also, mercury-arc valves require regular maintenance, during which
absolute cleanliness is critical. A valve that avoided these drawbacks was needed.

jessie_hyj

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laocheng88877

Fundamentals of Power Electronics 传到共享邮箱了
1 r9 k! q# g) c
power system stability and control----canada, kundar

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baoshunxian

ABB公司的确是电力行业的龙头，先锋，有太多的方面值得我们去学习了！