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By Zaks J.

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Extra info for 6-Valent analogues of Eberhards theorem

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The winding should be brought up to temperature slowly by steps t o avoid gassing of entrapped moisture and possible rupture of insulation. (2) The armature winding should preferably be dried out by the short-circuit method. When this method is used, the machine is operated a t rated speed with all phases of the armature winding short-circuited. Enough field current is applied to give an armature current (usually between 60% and 100% of rated armature current), which will produce the rate of temperature rise specified in item 1.

Commutator runout checks should be made with a dial indicator rather than by visual observations, a n d should be within t h e generator manufacturer’s tolerances. IEEE Std1095-1989 IEEE GUIDE FOR INSTALLATION O F VERTICAL GENERATORS AND The collector rings for the dc field current should be carefully assembled in accordance with the generator manufacturer’s instructions. For the reasons mentioned, collector ring runout at operating speed can be expected. Collector ring eccentricity should be checked with a dial indicator.

5) An alternative method of drying out armature windings is by means of electric space heaters. They should be located in air spaces under the machine or a t the back of the stator core and be distributed around the periphery of the machine t o allow for an even distribution of heat. If the rotor is not in place, the ends of the machine may be closed with end bells o r with large tarpaulins t o reduce the heat loss. A slight amount of ventilation must be provided t o exh a u s t the moisture-laden air.

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6-Valent analogues of Eberhards theorem by Zaks J.

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