Interested to Buy Any Domain ? << Click Here >> for more details...
How can we calculate ngr resistance for a generator and
Transformer ?
What type of transformer requires ngr ?
- 5 Answers
- 43468 Views
- Welspun, I also Faced
- E-Mail Answers
Answer Posted / a s bhandari
Ohmic value of neutral grounding resister for a transformer is calculated as follows:
R = Vph/ I where I - value of fault current to be limited to flow through the neutral path, normally it is 50A for 5 sec.
Based on above, for 6.6 kv star side of a transformer
resister value shall be 76.21ohm.
| Is This Answer Correct ? | 0 Yes | 3 No |
Post New Answer View All Answers
I have an existing old MCCB. ABB Model SACE, the rating are: Ue = 660 volts, Iu =1250 Amps, 3 poles, Ith (max) =800 amps at 45 deg C. I need a circuit breaker for my 3 phase motors, 380 volts 60 hz. the supplier required the minimum ampacity of the breaker to be 911 amps. can i use this breaker with rating of Iu =1250 amps but Ith = 800amps maximum?
we have a 2.5hp Starite electric motor water pump,the elec motor burned out,we need to replace starting capacitor(old capacitor specs erased),what microfarad rating capacitor do we need? 110-125V
how the aircraft outer body and inner body is separated ?
what would happen if reactive power (kvar)is increased (more)or decreased (less)? how much exact reactive power should be maintained? and what should be done for that
How to confirm the Phase shifting Transformer VECTOR GROUP relation , as below ZNy11.45d10.45-ZNYy0.15d11.15
1hp= how much rpm
List few applications of d.c series motor?
In a synchronous motor. if start is running at high speed. What will be the starting torque : Higher Lower Zero
54 Comments Alok and Bhanu play the following min-max game. Given the expression N = 38 + X*(Y – Z) where X, Y and Z are variables representing single digits (0 to 9), Alok would like to maximize N while Bhanu would like to minimize it. Towards this end, Alok chooses a single digit number and Bhanu substitutes this for a variable of her choice (X, Y or Z). Alok then chooses the next value and Bhanu, the variable to substitute the value. Finally Alok proposes the value for the remaining variable. Assuming both play to their optimal strategies, the value of N at the end of the game would be?
How REF protects transformer alone? explain with diagram.
What is nyquist contour?
IF % IMPEDANCE OF A TRANSFORMER IS INCREASED FROM 5.8% TO 8% HOW MUCH THE EFFICIENCY OF THE TRANSFORMER WILL COME DOWN?
what precautions to be taken while desigining a LT,HT panel. Eg-LT panel PCC panel with ACB installed. HT panel VCB panel with VCB installed. & what is main diffrence betwn IP54 & IP55 construction of panel.
I need bhel previous year quetion papers for electrical engineering department.I searched but i could not find out
Dear all, I want to use Induction motor to open and close a 1 ton door. How much power do I need. Thanks
