Whether it is possible to measure energy at the input of rectifier transformer (12 pulse with very high odd harmonics)

1903

Hi Suppose we have a wye/wye transformer which is grounded at both sides,in this situation, do we have ay ground transformer? in other words, ground transformer can do any thing more (while we have nuetral wire in both sides)? As the last question, what about 3rd harmonic? we have two choices: first using wye/delta transformer + ground transformer and second using wye/wye earthed connection.in the former choice, we dont have 3rd harmoonic at the secondary side but what about Yn/yn conection? do we suffer from 3rd harmonic in the Yn/yn connection?

1969

plz tell me,ht and lt panel terminals in substations explain beiefly

2928

i am trying to PSUs/govermeant jobs since last 2 years but still i m not success, plz help me.

1943

1. what is usage for power factor in industries?? 2.why we need to monitor power factor??

8208

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.

1881

is it possible to have dc motors on single chip

1839

why surge protectetor work explain with the help of circut diagram?

2008

How to select the gauge of wire for winding of motors? How to select number of turns for winding of three phase induction motor?

2740

Earth is a conductor or load?then ammeter connect to 3- phase supply,it shows the measurents or not?

2084

If we impress a dc voltage of 230 V on an unloaded 230 V, 50 Hz transformer it wi A give high secondary voltage B burn out C give secondary voltage as per K D none of these

2004

how did the testing of protection relays done through current injection

2089

Sir, I m 3rd year student 4m DCE and want to do internship in siemens or l&t or any other mnc related to electrical engineering. please tell me the procedure 4 same and oblige me

1988

Why hydropower stations are preferred solution for meeting peak loads in grids?

1006

what's the difference between abs/inc encoders. apart from the position remembrance what are all the other differences. and what's mean by grey code.

2088