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TEMPUS ENERGY: POWER QUALITY, HARMONICS 1: The use of
TEMPUS ENERGY: POWER QUALITY, HARMONICS 1: The use of

... primary winding and two secondary windings. The first secondary winding has delta connected windings and the second secondary winding has wye connected windings. By combining these delta and wye connected windings, phase differences of 30° are obtained between the secondary voltages of these winding ...
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... output of the operational amplifier is zero and transistor T1 remains off. The relay, which is connected to the collector of transistor T1, also remains deenergised. As the AC supply to the electrical appliances is given through the normallyClosed (N/C) terminal of the relay, the supply is not disco ...
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Mercury-arc valve



A mercury-arc valve or mercury-vapor rectifier or (UK) mercury-arc rectifier is a type of electrical rectifier used for converting high-voltage or high-current alternating current (AC) into direct current (DC). It is a type of cold cathode gas-filled tube, but is unusual in that the cathode, instead of being solid, is made from a pool of liquid mercury and is therefore self-restoring. As a result, mercury-arc valves were much more rugged, long-lasting and could carry much higher currents than most other types of gas discharge tube.Invented in 1902 by Peter Cooper Hewitt, mercury-arc rectifiers were used to provide power for industrial motors, electric railways, streetcars, and electric locomotives, as well as for radio transmitters and for high-voltage direct current (HVDC) power transmission. They were the primary method of high power rectification before the advent of semiconductor rectifiers, such as diodes, thyristors and gate turn-off thyristors (GTOs) in the 1970s.
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