Answer Posted / a.narasimha rao

Transformer capacity is 250 KVA

Primary current = 250000/1.732x11000= 13.12 Amps

Short circuit current ( 6 times primary current )

total current would comes -----90 amps

Size of the cable --- 3c X 35/ 50 sq.mm 11 kv HT XLPE
cable is required for primary

Secondary side current -----333.35 amps

cable size is 3.5 c X 300 sq.mm AYFY cable is required

State superposition theorem?

1084

---

Grid fault level [KA]?

2554

---

what happens when series resonance occurs?

1784

---

what is meant by tranformer impedance?

2553

---

What is PEC??Applications........

1915

---

How to calculat the ratio of HT\LT in energy meter

2627

---

Why phase sequence must be same in any ht motor or generator circuit?if phase sequence doesn't same whatever will be affect on circuit?

2152

---

What is the significance of integral controller and derivative controller in a pid controller?

1103

---

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?

2946

---

why ups rating in kva? and why ups are in parellel?.why isolation transformer is used in ups?

1880

---

If increased the frequency up to 1000 then what changes shows in voltage?

2366

---

hwat type of motor is used in thermal gas turbine hydro nuclear power plants and why

1834

---

what are the analog quality input for protection function?what are minimum reqiments?

1787

---

how is the connection of a 3 phase ct trivector meter done on a pole mounted transformer

1311

---

we have two generators different capacity on 15 MW and other 6MW at 11 KV , 15 MW gen. bus short level current 40KA,and 6MW short level current 25KA,, length of cable 100MTR between 6 MW from 15MW gen. for bus coupling . kindly tell any one can we use both NGR OR one NGR from any GEN. BOTH NGR has diff. rating. Tariq pakistan

1613

---