By Shelford Bidwell
;Artillery strategies 1939-1945 КНИГИ ;ВОЕННАЯ ИСТОРИЯ Издательство: Almark Publishing Co.Серия: The Mechanics of WarАвтор: Shelford Bidwell,Язык: EnglishГод издания: 1976Количество страниц: ISBN: 0-85524-254-XФормат: pdf Размер: 52,8 mbArtillery strategies by way of Shelford Bidwell in¬troduces The Mechanics of battle, a brand new sequence from Almark.The books supply the reader an perception into how the ancient strategic judgements of the battle turned the strategies of the soldier at the flooring. All photos except for these listed here are from the Imperial battle Museum assortment. RAPIDили IFOLDER zero
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Extra resources for Artillery Tactics 1939-1945
E. partly heating and lighting and partly power. Too great a dip with too long a recovery time will cause objectionable flicker of lighting and may have adverse effects on the running of other motors and voltage-sensitive equipment such as radar (if operated direct from the supply system) and on the starters for fluorescent lighting. British Standard specifications require contactors to operate satisfactorily at 85% of normal voltage but, although when closed they will generally hold in at much lower voltages, there is a danger of the contact pressure being so reduced that contact welding occurs.
The setting of the latter must be sufficiently high to prevent operation if a secondary terminal fault occurs (thereby maintaining discrimination with low-voltage feeders), but will still provide instantaneous' clearance of high-voltage terminal and winding faults. In practice a setting of 15-20 times the full-load current will be used. Whichever form of overcurrent protection is provided it must be remembered that a low- or medium-voltage system short-circuit must be removed within a certain maximum time if the transformer is not to suffer damage.
8 Effect of standing load current on discrimination To check that discrimination will be achieved on a particular system it will be necessary to conduct a discrimination or coordination study. This entails plotting and comparing the time-current characteristics of all the protective devices on graph paper. The wide range of currents and times involved makes it convenient to use log/log paper. Naturally the characteristics of adjacent devices should not cross, but this alone will not ensure discrimination.
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