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electrode
electrode

... electrical resistivity30 lies between those of conductors and insulators. A phosphorus impurity, with five valence electrons, provides one extra conduction electron that is free to move through the crystal (Figure 15-26b). An aluminum impurity has one less bonding electron than necessary, creating a ...
Constructional Features, Operating Principles, Characteristics and
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... by selecting the appropriate tap rating to meet the most likely operating condition. It is important to note that the reactive power consumed by the UT will absorb a significant part of the generator Mvar output under most conditions. IEEE C57.116 [9] recommends selecting the main parameters of UT ( ...
ELTR 120 (Semiconductors 1)
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... to be substances whose atoms contain four valence-shell (outer level) electrons. Silicon and germanium are traditionally given as the two major semiconductor materials used. However, there is more to a ”semiconductor” than this simple definition. Take for instance the element carbon, which also has ...
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... BD9535MUV is a 2ch switching regulator controller with high output current which can achieve low output voltage (0.7V~ 2.0V) from a wide input voltage range (4.5V~25V). High efficiency for the switching regulator can be realized by utilizing an ...
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... Consult the data plate on the equipment for the power supply requirements. Due to the elevated absorbance of the primary current from the power supply network, high power systems affect the quality of power provided by the network. Consequently, connection restrictions or maximum impedance requiremen ...
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... optimal stability, and current-limit protection by using a constant on-time, pseudo-fixed frequency with a programmable currentlimit, current-control scheme. In addition, these devices offer optimum performance at low duty cycles by utilizing valley current-mode control architecture. This allows the ...
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... voltage. Smaller arresters than shown may be used, contact your Ohio Brass representative for details. For convenience, the data shown in this catalog includes the traditional duty-cycle voltage rating associated with the MCOV of each arrester. The selection of the actual type will be primarily gove ...
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... response time of for instance 0.5 periods of the grid voltage (10 ms). This implies it is also possible to deal with fast voltage dips (although the depth must be limited). An electronic voltage stabilizer has a low weight and its dimensions are small. The output voltage can be adjusted very accurat ...
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... transformer ratios, communication options and power measurement parameters can be configured via the optional menu driven Integra DIS-1540 display unit. A simple two button interface on the front panel of the unit allows display of 32 major electrical and power quality parameters. All set-up screens ...
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... transformer ratios, communication options and power measurement parameters can be configured via the optional menu driven Integra DIS-1540 display unit. A simple two button interface on the front panel of the unit allows display of 32 major electrical and power quality parameters. All set-up screens ...
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... the VOUT voltage with the voltage on ISET. If the load current increases, it causes a drop in the VOUT voltage relative to VISET. The ITH voltage then rises until the average inductor current matches that of the load current. At low load current, the inductor current can drop to zero and become nega ...
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... distribution manifests the need for a more improved and efficient method of distributing power to data centers. Most electrical infrastructures today use alternating current (AC) to provide power to data centers, which distributes electricity in the range 100 - 600 V AC throughout the facility. Howe ...
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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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