In 2004, the mercury arc valves groups were replaced with light-triggered thyristor groups to eliminate the environmental risks of maintenance costs of the obsolete mercury arc valves.
22.
Between 1992 and 1993 the mercury arc valves of Pole 1 were replaced with thyristor valves by GEC Alsthom, increasing the maximum power and voltage of the line to its current levels.
23.
Prior to the development of mercury arc valve rectifiers, rotary converters were used to produce DC power from AC . Like other commutator-type machines, these worked better with lower frequencies.
24.
Formerly, the mercury arc valve, the high-vacuum and gas-filled diode thermionic rectifiers, and triggered devices such as the thyratron and ignitron were widely used in power electronics.
25.
In 1936 the first experimental HVDC ( high voltage direct current ) line using mercury arc valves was built between load flow studies could be run more efficiently allowing for much better planning of power systems.
26.
Like glass-bulb valves, steel-tank mercury arc valves were built with only a single anode per tank ( a type also known as the " excitron " ) or with multiple anodes per tank.
27.
At that time, Bipole I used the world's highest operating voltage to deliver the largest amount of power from a remote site to a city, and employed the largest mercury arc valves ever developed for such an application.
28.
Mercury arc valves remain in use in some South African mines, Kenya ( at Mombasa Polytechnic-Electrical & Electronic department ), and on the Manx Electric Railway on the Isle of Man ( mercury arc rectifier now decommissioned ).
29.
Initial operating experience was gained using three series-connected, single anode mercury arc valves in each converter arm, but by 1959 experience had been gained with operating with either one or two mercury arc valves in series per arm.
30.
Initial operating experience was gained using three series-connected, single anode mercury arc valves in each converter arm, but by 1959 experience had been gained with operating with either one or two mercury arc valves in series per arm.
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