mercury arc valve sentence in Hindi
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- 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.
- 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.
- 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.
- 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.
- 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.
- 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.
- 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.
- 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 ).
- 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.
- 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.
- Mercury arc valves were common in systems designed up to 1972, the last mercury arc HVDC system ( the Inter-Island HVDC link between the North and South Islands of New Zealand, which used them on one of its two poles.
- For this reason the twelve-pulse system has become standard on almost all line-commutated converter HVDC systems, although HVDC systems built with mercury arc valves usually allowed for temporary operation with one of the two six-pulse groups bypassed.
- The HVDC Inter-Island was also upgraded by increasing the operating voltage of the lines, replacing the original Cook Strait submarine cables and installing a new thyristor pole in parallel to the existing mercury arc valve converter equipment to double its capacity to 1240 MW.
- Mercury arc valves were used extensively in DC power systems on London Underground, and one was still observed to be in operation in 2004 at the disused Goodge Street shelter featuring in an early episode of Doctor Who as an alien brain, cast for its " eerie glow ".
- Mercury arc valves were built with ratings of up to 150 kV, 1800 A . The last ( and most powerful ) mercury arc system installed was that of the Nelson River DC Transmission System in Canada, which used six anode columns in parallel per valve and was completed in 1977.
- ZBD in the early 1880s only worked with AC . Not until grid controlled mercury arc valves became available for power transmission during the period 1920 to 1940 was it possible to utilize high-voltage direct current for large transmission projects, but by that time AC transmission was dominant, cheap and reliable.
- The controls and older converters, including the mercury arc valves, were completely replaced ( in the same valve hall ) by a single pair of 3, 100 MW 12-pulse converters built by ABB . The upgrade was made to eliminate the environmental risks of maintenance costs of the obsolete mercury arc valves.
- The controls and older converters, including the mercury arc valves, were completely replaced ( in the same valve hall ) by a single pair of 3, 100 MW 12-pulse converters built by ABB . The upgrade was made to eliminate the environmental risks of maintenance costs of the obsolete mercury arc valves.
- Mercury arc valves with grading electrodes of this type were developed up to voltage ratings of 150 kV . However, the tall porcelain column required to house the grading electrodes was more difficult to cool than the steel tank at cathode potential, so the usable current rating was limited to about 200 & ndash; 300 A per anode.
- The link originally was a bipolar 600 MW link with mercury arc valves, until the original equipment was paralleled onto a single pole ( Pole 1 ) in 1992, and a new thyristor-based pole ( Pole 2 ) was commissioned alongside it, increasing the link capacity to 1040 MW . Pole 1 was fully decommissioned effective 1 August 2012, and the replacement thyristor-based Pole 3 was fully commissioned on 29 May 2013, restoring the link to a bipolar 1200 MW configuration.
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