The electrical componentry is nevertheless markedly different : in the Re 4 / 4 II locomotives, controlled rectifiers ( phase fired controllers ) made of thyristors and diodes supply the traction motors with wavy direct current.
22.
The propulsion system was initially upgraded from the original mercury arc based Ignitron rectifiers to more reliable solid state silicon controlled rectifiers and later the main transformers had their coolant replaced with one that did not contain PCBs.
23.
Power devices such as silicon controlled rectifiers and thyristors ( as well as the mercury valve and thyratron ) allow control of the start of conduction, but rely on periodic reversal of current flow to turn them off.
24.
In addition to its use as the active device in relaxation oscillators, one of the most important applications of UJTs or PUTs is to trigger thyristors ( silicon controlled rectifiers ( SCR ), TRIAC, etc . ).
25.
Electrical soft starters can use parallel-connected silicon-controlled rectifiers ( thyristors ), but in some circumstances with three-phase control, the control elements can be a reverse-parallel-connected SCR and diode.
26.
Therefore, because the trigger-transformer has very low impedance, the transformer, triggering-circuit, and silicon controlled rectifier ( SCR ) must be able to handle very high peak-currents, often in excess of 1500 amps.
27.
A "'silicon controlled rectifier "'or "'semiconductor-controlled rectifier "'is a four-layer power engineers led by Gordon Hall and commercialized by Frank W . " Bill " Gutzwiller in 1957.
28.
A "'silicon controlled rectifier "'or "'semiconductor-controlled rectifier "'is a four-layer power engineers led by Gordon Hall and commercialized by Frank W . " Bill " Gutzwiller in 1957.
29.
This is the EMP phenomenon which grabs headlines for its potential to ( according to some commentators ) reverse-bias and destroy semiconductor junctions-hence, all manner of integrated circuits in cell phones, the computer you're reading this on, TVs and radios, and the computers and silicon-controlled rectifiers in all modern automobiles.
30.
Medium-power thyratrons found applications in machine tool motor controllers, where thyratrons, operating as phase-controlled rectifiers, are utilized in the tool's armature regulator ( zero to " base speed ", " constant torque " mode ) and in the tool's field regulator ( " base speed " to about twice " base speed ", " constant horsepower " mode ).
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