Answer Posted / arun

Dyn11,YNyn11,YNd1,YNyn0, Dyn1, There are seven type of
vector groups in power transformer

I am designing new project sub station with 220 kV / 11 kV, 40 MVA capacity. This project have many recifier sets, which can generate 3rd harmonics. Now I have to select vector group of This transformer. To minimise 3rd harmonics, what care should I take in selection of Transformer Vecrtor group? If it is Y-Y with open Delta tertiary then what should be the rating & voltage of Tertiary Winding?

1838

---

when we gave dc supply to 220v dc motor its rpm is 1200. then we gave 180v. how many rpm of its motor. gave answer with calculation at my ID.... ravizak@ymail.com

2308

---

Why current shoots up in the secondary on the knee point voltage during saturation test of CT? How core saturation effects the secondary current (while the primary side is open)? What the logic behind this?

1971

---

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

1962

---

what is the acceptable value of TAN DELTA and dissipation factor for 11kV, 1.75HP Motor?.

4130

---

hi can anyone pls tell me the eee interview core questions asked in l&t

2000

---

regarding safety what would u consider the most important rules to observe when inspecting electrical equipment?

2007

---

along with technical test papers

1572

---

What is the difference between the relay and the circuit breaker?

1072

---

What is Faraday's law

1462

---

When will you multiply and devide with derating factors to the actual value while sizing the cable?

1902

---

how many Classification of fire extinguisher

2077

---

1.what is the reason for transformer and lightning arrester blast in 33kv system

3051

---

What is the power factor of a transformer at no load?

1065

---

how to find the multiplication factor for digital energy meter and analog energy meter

2166

---