Why we use less dia. fuse and conductors at H.T. side, although we use higher di

Why we use less dia. fuse and conductors at H.T. side, although we use higher dia. cables on L.t. side?

Question Posted / sbarinderpal52

4 Answers
7796 Views
RRB, I also Faced
E-Mail Answers

Answers were Sorted based on User's Feedback

Why we use less dia. fuse and conductors at H.T. side, although we use higher dia. cables on L.t. si..

Answer / shri..

In HT line Voltage is high & current is low

In LT Line Voltage is Low & current is high.

If we take a example of Stape down Transformer

Is This Answer Correct ?

11 Yes

1 No

Why we use less dia. fuse and conductors at H.T. side, although we use higher dia. cables on L.t. si..

Answer / virendra joshi

Universaly W(power) = V X I , mean for a constant power if
current increase Voltage decrese & if viltage increase
current Decrese. In LT voltage is less ( 415 ) so current
is high & fuse is bigger in size, simonteniously in HT volt
is more then current is less hence size of the fuse wire
will be lesse in terms of cross section.

Is This Answer Correct ?

4 Yes

0 No

Why we use less dia. fuse and conductors at H.T. side, although we use higher dia. cables on L.t. si..

Answer / al amaan

The size of the cable(Conductor) is choosed depends on the current value
For Example In 1000 KVA,11 KV/433 V Step down Transformer
Formula for calculate Power in KVA; P=√3*V*I
Current Formula; I=P/(V*√3)
Current in H.T side; ; I=1000/(11*√3)
I= 5.25 A
Current in L.T side; I=1000/(433*√3)
I= 133 A
From that the current in L.T side is higher than the H.T side So we use Higher dia cables in L.T side

Is This Answer Correct ?

1 Yes

0 No

Why we use less dia. fuse and conductors at H.T. side, although we use higher dia. cables on L.t. si..

Answer / electrical alie

Go to a university that has an electrical engineering
curriculum an you will see the light.

Is This Answer Correct ?

2 Yes

3 No

Post New Answer

More Electrical Engineering Interview Questions

What is the meaning of EDO in DG panels?

3 Answers Bajaj,

checklist of ELCB

1 Answers EECE,

what is 3rd Harmonics? how it is generated in alternator

2 Answers Aditya Birla,

How can we calculate the current if we have load in KVA and if the load in KW then what formula will be use for calculating the current. please give both the formula for calculating the current.

3 Answers

which is dangerous AC or DC?

10 Answers

If Three Runs of 1Cx300 Sqmm Cable between Transformer and VCB and the distance between 100mtrs. what will be total length of Cable and if cost 1500Rs per meter,what would be the total cost

1 Answers ANITS,

how can we determine size of a cable by knowing the kw or current rating of a load?how can we calculate the resistance box of a slip ring motor?

0 Answers TK Group,

What is the formula to calculate the rating of power cable for three phase current.

0 Answers

why receiving end voltage increases in a system when capacitive load is added

1 Answers

THERMAL CAPACITANCE IS MEASURED IN..................................................

0 Answers SSC,

30 kVA and voltage 380/220VAC how to find out kA?

5 Answers

why does the time taken for fuse to melt is longer as the wire length increases?

1 Answers

For more Electrical Engineering Interview Questions Click Here