Ad
related to: thyristor valve hvdcsupplyhouse.com has been visited by 100K+ users in the past month
Search results
Results From The WOW.Com Content Network
The thyristor valve was first used in HVDC systems in 1972 on the Eel River Converter Station in Canada. [23] The thyristor is a solid-state semiconductor device similar to the diode, but with an extra control terminal that is used to switch the device on at a
The development of thyristor valves for HVDC began in the late 1960s. The first complete HVDC scheme based on thyristor was the Eel River scheme in Canada, which was built by General Electric and went into service in 1972. [17] Since 1977, new HVDC systems have used solid-state devices, in most cases thyristors. Like mercury arc valves ...
HVDC Pole 2 thyristor valve hall at Haywards in the New Zealand HVDC Inter-Island scheme. A valve hall is a building which contains the valves of the static inverters of a high-voltage direct current plant. The valves consist of thyristors, or at older plants, mercury arc rectifiers.
The converter is usually installed in a building called the valve hall. Early HVDC systems used mercury-arc valves, but since the mid-1970s, solid state devices such as thyristors have been used. Converters using thyristors or mercury-arc valves are known as line commutated converters. In thyristor-based converters, many thyristors are ...
A thyristor (/ θ aɪ ˈ r ɪ s t ər /, from a combination of Greek language θύρα, meaning "door" or "valve", and transistor [1]) is a solid-state semiconductor device which can be thought of as being a highly robust and switchable diode, allowing the passage of current in one direction but not the other, often under control of a gate electrode, that is used in high power applications ...
In the first phase of the project (4 bridges at each end) each valve contained 280 such thyristors in series with two in parallel [1] – the largest number ever used in a single HVDC valve. Phases 2 and 3 used improved thyristors with a rating of 2.4 kV each and only required 192 in series per valve – still a large number by modern standards ...
The thyristors, supplied by the German HVDC consortium (Siemens, AEG and Brown Boveri) used water cooling [10] for the first time in an HVDC project. Until that time, the relatively few HVDC schemes using thyristors had used either air cooling or, as on the Cahora Bassa project supplied by the same consortium, oil-cooling.
A back-to-back station has no transmission line and joins two separate AC grids at a single point. Historical HVDC systems used the Thury system of motor-generators but these have all been made obsolete by later developments such as mercury-arc valves (now also obsolete), thyristors, and IGBT power transistors.