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The Power Behind the Trams.— Many people wonder what takes place within the walls of. the electric sub-station in Jervois Quay, Wellington. near the Central Fire Station. It is there that the electric current received from the hydro-electric power station at Mangahao is converted from high voltage alternating current to low voltage direct current, the form in which it is used in the motors of the trams. Top lef t: A general view of the interior of the sub-station. The current from Mangahao enters the building on the side shown at the right of the picture, passing through an extensive switchboard. From the switchboard it passes to the transformers. standing on the floor toward the right, and from them to

the transformers, standing on the floor toward thr right, and from them to the rotary converters, seen in the centre. Converted here to direct current here to direct current, it flows to the left, whence it is distributed to the various feeder circuits of the tramway system. Top right: On of the big transformers, which receives the 11,000-volt current as it is supplied by mangahoa and transforms it to 402 volts, still in the alternating form. Bottom left: One of the three rotary converters. Receiving the 402-volt alternating current, three change it to the direct form, the voltage rising to 550 in the process. Bottom centre: The main power switch (left) the ammeter (top right), and the recording istruments which registers the total Bottom right: Two of the feeder switches to the tramway district circuits. Each circuit has its own switch and ammeter

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Bibliographic details

Dominion, Volume 29, Issue 256, 25 July 1936, Page 7

Word Count
263

The Power Behind the Trams.—Many people wonder what takes place within the walls of. the electric sub-station in Jervois Quay, Wellington. near the Central Fire Station. It is there that the electric current received from the hydro-electric power station at Mangahao is converted from high voltage alternating current to low voltage direct current, the form in which it is used in the motors of the trams. Top left: A general view of the interior of the sub-station. The current from Mangahao enters the building on the side shown at the right of the picture, passing through an extensive switchboard. From the switchboard it passes to the transformers. standing on the floor toward the right, and from them to the transformers, standing on the floor toward thr right, and from them to the rotary converters, seen in the centre. Converted here to direct current here to direct current, it flows to the left, whence it is distributed to the various feeder circuits of the tramway system. Top right: On of the big transformers, which receives the 11,000-volt current as it is supplied by mangahoa and transforms it to 402 volts, still in the alternating form. Bottom left: One of the three rotary converters. Receiving the 402-volt alternating current, three change it to the direct form, the voltage rising to 550 in the process. Bottom centre: The main power switch (left) the ammeter (top right), and the recording istruments which registers the total Bottom right: Two of the feeder switches to the tramway district circuits. Each circuit has its own switch and ammeter Dominion, Volume 29, Issue 256, 25 July 1936, Page 7

The Power Behind the Trams.—Many people wonder what takes place within the walls of. the electric sub-station in Jervois Quay, Wellington. near the Central Fire Station. It is there that the electric current received from the hydro-electric power station at Mangahao is converted from high voltage alternating current to low voltage direct current, the form in which it is used in the motors of the trams. Top left: A general view of the interior of the sub-station. The current from Mangahao enters the building on the side shown at the right of the picture, passing through an extensive switchboard. From the switchboard it passes to the transformers. standing on the floor toward the right, and from them to the transformers, standing on the floor toward thr right, and from them to the rotary converters, seen in the centre. Converted here to direct current here to direct current, it flows to the left, whence it is distributed to the various feeder circuits of the tramway system. Top right: On of the big transformers, which receives the 11,000-volt current as it is supplied by mangahoa and transforms it to 402 volts, still in the alternating form. Bottom left: One of the three rotary converters. Receiving the 402-volt alternating current, three change it to the direct form, the voltage rising to 550 in the process. Bottom centre: The main power switch (left) the ammeter (top right), and the recording istruments which registers the total Bottom right: Two of the feeder switches to the tramway district circuits. Each circuit has its own switch and ammeter Dominion, Volume 29, Issue 256, 25 July 1936, Page 7