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Thyristor valve stacks for Pole 2 of the HVDC Inter-Island between the North and South Islands of New Zealand. The man at the bottom gives scale to the size of the valves. Each thyristor valve will typically contain tens or hundreds of thyristor levels, each operating at a different (high) potential with respect to earth.
When just valves 1 and 2 are conducting, the DC voltage is formed from two of the three phase voltages. ... converter for Pole 2 of the HVDC Inter-Island between the ...
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 ...
The Bipole 2 transmission line runs 937 kilometres (582 mi) from Henday to Dorsey. Bipole 2 can transfer a maximum power of 1800 MW at a potential of ±500 kV. Bipole 2 consists of four 12-pulse converter groups at each end (two in series per pole) and was put into service in two stages. After the first stage in 1978 the maximum power was 900 ...
The HVDC Inter-Island link is a 610 km (380 mi) long, 1200 MW high-voltage direct current (HVDC) ... Haywards Pole 2 thyristor valve, during maintenance shutdown.
The scheme comprises 48 thyristor valves (12 at each end of each pole) and with each thyristor valve including 54 thyristor levels in series. The thyristors are of 100 mm diameter and are rated at 5.2 kV. The thyristor valves are floor-mounted even though the station is located in a seismically active area.
Electric power transmission through interconnectors using high-voltage direct-current ... as positive pole with HVDC Inter-Island 2 in 1992. ... VSC HVDC valve ...