Answer / ashish tiwari

The HV cbale size shall be base on the fault level on HV
side. Like 18.4KA fault current for 11 KV supply & 21.34 KA
fault current for 33 KV supply. We can calculate the HV
cable
BY USING FORMULA ISH = K x A/( sq. root of T)


Where,
ISH :SHORT CIRCUIT CURRENT IN KA (r.m.s.)

T :DURATION OF SHORT CIRCUIT CURRENT IN SECONDS

A :AREA OF ALUMINIUM CONDUCTOR IN MM2

K :IS A CONSTANT = 0.094 for aluminium

ISH x Sq.rootT 18.4 x Sq. root 1
A = ------------ = ------------
K 0.094
= 195.7 sq.mm

HENCE 3 C x 240 SQ.MM XLPE (AL) CABLE IS REQUIRED FOR
INCOMING SIDE AS WELL AS OUTGOING SIDE OF 11 KV SUPPLY.

Answer / ali

i want calcuiate the size of hv 6.6kv cable can trans 750 amper

with regard

what is use of substation? Any book on how to instal or construction of substations?

6 Answers   Siemens,

---

PAC and simple Ac different

0 Answers  

---

Why the arms of delta in a delta-wye power transmission system are kept constant??

0 Answers  

---

If the Supply voltage is increased by n times, the cross section of conducter will [increase/decrease] by ________ times ?

4 Answers  

---

what is the breakdown voltage value in BDV test in transformers?

6 Answers   Siva, TATA,

---

What is a diode?

0 Answers  

---

why microprocessors are named as 8085 ,8086 etc? what's the reason for this???

15 Answers   Bhel, HCL,

---

How to calculate Ith (I thermal) for curent transformer

0 Answers  

---

what is level 2 automation?

0 Answers  

---

I am final year b.tech student..i applied for gate but i am not interested any of my engineering subjects. i am interested in management wise.. is my option correct after b.tech..

1 Answers  

---

Is it possible to implement Restricted Earth Fault protection for a transformer without neutral CT?

2 Answers  

---

how many earthing required for ups, what should be the earth voltages

9 Answers   Juniper Networks,

---