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Can anybody please refer the best and simple book for about Protection relays and in detail of all its protection ?
What will be the current drawn by HT motor, if low voltage is applied.. any formula to calculate the LT amps of HT motor.?
where can the transformer having vector group Yny0 be used??
What is Surge Capacitor? Why it is require in Generator Circuit Breaker,inspite of surge arrester?
Please sent me some previous year question papers of BSNL-JTO telecom and RRB in ELectrical Engineering to varshashahi@yahoo.com
What are the advantages of using distance protection schemes as opposed to normal overcurrent/ earth fault protection on high voltage feeders.
What are the types of windings present in the ceiling fan? What winding will be effective first when we started the fan?What are the resistance and inductance ratios comparatively at the initial speed and full speed of the fan?
please explain how to do 'pole drop test' on generator?
how to calculate the no load current in transformer?
What is the armature mmf in a D.C machine?
what do you mean by plant earthing system.
which type of amplifiers are used in multimete?
Define resonant peak?
What are the advantages & disadvantages of a group electrive drive?
My question is whether bellow formula is correct to find bus size for 46kA for 0.5 second & what is RT in bellow formula. formula to calculate the size of busbar to withstand the thermal stresses due to currents with duration of 0.2 sec to 5 sec. Sp = RT( I x I x t) / K Where Sp – is the cross sectional area of bus bar in millimeters. I - is the value of AC fault current. t - is the operating time of disconnecting device in seconds. K – is the factor depending on the material of the conductor, insulation and initial and final temperature. Value of ‘k’ for copper is 143.
