Wednesday, January 13, 2016

HIGHLIGHTED POINTS FOR IS 1180 (Part 1) : 2014


To improve the efficiency of our electrical system recently Bureau of Indian Standards has taken some major steps to improve the electrical network of our country and now from 1st Feb 2016 distribution transformer is added in mandatory equipment list of BIS and to manufacturing the transformer manufacturer must be obtained the license from BIS for this BIS issued the Fourth revision of IS 1180 (Part1): Outdoor Type Oil Immersed Distribution Transformers upto 2500kVA, 33KV Specification. In which BIS have been mentioned some major changes in the specification of transformers, some of the major highlighted points are as below:

In revised IS, transformers have been divided in three categories, which are as below:

a) Three phase distribution transformers upto and including 200KVA
b) Three phase distribution transformers higher than 200KVA upto and including 2500KVA
c) Single phase distribution transformers upto and including 25KVA

In revised IS specification, losses for each rating for each category have been defined in three levels which are denoted by as follows;

a) Energy Efficiency Level 1,
b) Energy Efficiency Level 2
3) Energy Efficiency Level 3

In each level maximum losses (No Load Loss + Load Loss) at 50% load & 100% load have been specified for each rating in all categories. Losses in Energy Efficiency Level 1 is almost equal to ECBC 2009 guidelines.

In revised IS 1180 there are three energy efficiency levels and for each categories, maximum values of total losses have been defined on 50% load and 100% load. Losses & percentage value of impedance for different categories are as below:

a) Three phase distribution transformers upto and including 200KVA, 11KV Class

Sl. No.
Rating (KVA)
% Z
Energy Efficiency Level 1
Energy Efficiency Level 2
Energy Efficiency Level 3
@ 50%
@ 100%
@ 50%
@ 100%
@ 50%
@ 100%
1
16KVA
4.5%
150W
480W
135W
440W
120W
400W
2
25KVA
4.5%
210W
695W
190W
635W
175W
595W
3
63KVA
4.5%
380W
1250W
340W
1140W
300W
1050W
4
100KVA
4.5%
520W
1800W
475W
1650W
435W
1500W
5
160KVA
4.5%
770W
2200W
670W
1950W
570W
1700W
6
200KVA
4.5%
890W
2700W
780W
2300W
670W
2100W



b) Three phase distribution transformers Higher than 200KVA upto and including 2500KVA, 11KV Class

Sl. No.
Rating (KVA)
% Z
Energy Efficiency Level 1
Energy Efficiency Level 2
Energy Efficiency Level 3
@ 50%
@ 100%
@ 50%
@ 100%
@ 50%
@ 100%
1
250KVA
4.5%
1050W
3150W
980W
2930W
920W
2700W
2
315KVA
4.5%
1100W
3275W
1025W
3100W
955W
2750W
3
400KVA
4.5%
1300W
3875W
1225W
3450W
1150W
3330W
4
500KVA
4.5%
1600W
4750W
1510W
4300W
1430W
4100W
5
630KVA
4.5%
2000W
5855W
1860W
5300W
1745W
4850W
6
1000KVA
5.0%
3000W
9000W
2790W
7700W
2620W
7000W
7
1250KVA
5.0%
3600W
10750W
3300W
9200W
3220W
8400W
8
1600KVA
6.25%
4500W
13500W
4200W
11800W
3970W
11300W
9
2000KVA
6.25%
5400W
17000W
5050W
15000W
4790W
14100W
10
2500KVA
6.25%
6500W
20000W
6150W
18500W
5900W
17500W

c) Single Phase distribution transformers upto and including 25KVA, 11KV Class
Sl. No.
Rating (KVA)
% Z
Energy Efficiency Level 1
Energy Efficiency Level 2
Energy Efficiency Level 3
@ 50%
@ 100%
@ 50%
@ 100%
@ 50%
@ 100%
1
5KVA
4.0%
40W
115W
35W
95W
30W
75W
2
10KVA
4.0%
70W
190W
60W
170W
55W
150W
3
16KVA
4.0%
95W
265W
82W
224W
63W
190W
4
25KVA
4.0%
125W
340W
110W
300W
95W
260W

Further to above it is also observed that IS 1180 are now also applicable for 22KV & 33KV class transformers, losses values for 22KV & 33KV class transformers shall be applicable as per below clause:

a) For transformers having voltage class above 11KV and upto and including 22KV, the permissible total loss value shall not exceed by 5% of the maximum total losses values mentioned in table a) & b) for three phase.

b)  For transformers having voltage class above 22KV and upto and including 33KV, the permissible total loss value shall not exceed by 7.5% of the maximum total losses values mentioned in table a) & b) for three phase.

c) For transformers having voltage class above 11KV and upto and including 22KV, the permissible total loss value shall not exceed by 7.5% of the maximum total losses values mentioned in table c) for single phase.

d)  For transformers having voltage class above 22KV and upto and including 33KV, the permissible total loss value shall not exceed by 10% of the maximum total losses values mentioned in table c) for single phase.

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