. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . voltage, due to the ar-rangement of windings of the generator,is know as self-regulation. Over-com-pounded generators are used in connec-tion with railway operations and similarconditions. A compound generator always has alow resistance shunt usually of Germansilver connected across the terminals ofits series field winding. It is easily un-derstood that it would be impossible towind the series field of the generator sothat it would give the voltagesdesired. Moreover, the generator mi
. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . voltage, due to the ar-rangement of windings of the generator,is know as self-regulation. Over-com-pounded generators are used in connec-tion with railway operations and similarconditions. A compound generator always has alow resistance shunt usually of Germansilver connected across the terminals ofits series field winding. It is easily un-derstood that it would be impossible towind the series field of the generator sothat it would give the voltagesdesired. Moreover, the generator mightbe used in other conditions and a dif-ferent over-compounding would be neces-sary. By means of the German silvershunt, the amount of current passingthrough the series field can be adjusted tosuit the voltage conditions. When a self-excited generator is firststarted the slight residual magnetismleft in the pole pieces induces a smallamount of voltage in the armature. Thissmall voltage, in turn, produces a smallcurrent in the field, which strengthens theresidual magnetism. This increase in field. Voltmeter strength, increases the current and thegenerator builds up to its rated voltage. Voltage regulation is often spoken ofin connection with generators. It is thechange of voltage from no load to fullload expressed as the percentage of fullload, .\ssuming that we have a shuntgenerator, which under full load will give110 volts and at light loads will be The regulation is then — 110 =: or IS per cent. 110 Electric generators are used by thethousand. Their application is almostuniversal. They are made in all sizesfrom 1 kilowatt to 50,000 kw. Manymethods of drive are used Some arearranged for belt drive. They have twoor three bearings, shaft and pulley. Othersare the coupled self-contained have two bearings and a shaft fordirect connection to a prime mover suchas a steam engine, internal-combustionengine or water power. Engine type generators cons
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectrailroa, bookyear1901
