High-efficiency distribution transformers

 High-efficiency transformers create economic benefits for the society. Besides reduced greenhouse gas emissions, they improve reliability and give potentially longer service life by bringing down temperature rises through energy-efficiency improvements. India has, by now, adopted the international IEC standards as well as introduced star labelling for selected categories of transformers.
According to Leonardo Energy – Transformers Report, 2005, the global transmission and distribution network losses will lead to global economic loss of more than $61 billion annually and annual greenhouse gas emissions of more than 700 million tonnes. It is estimated that one-third of network losses occur in transformers, and of these transformer losses, 70 per cent occur in distribution transformers. The report estimates that the total electricity lost on utility networks around the world in 2005 was about 1,279 TWh, and of that, distribution transformers consumed 298.4 TWh.
Most power losses occur in the transformer core made up of magnetic steel or in the electrical coils or windings of either aluminium or copper.
Copper reduces load loss, because it is a more efficient conductor. By reducing load loss, Copper wound transformers helps increase profit margins of power distribution companies. Besides, the smaller size of copper transformers saves core steel as well as structural elements, including the tank, oil, cooling equipment and other accessories. And copper being stronger than aluminium, the former withstands stresses better than aluminium, thus, extending the transformer’s life and reducing lifecycle maintenance costs.
The market size for transformers in 2013 was at 2,66,000 MVA in India and has seen an annual growth of 17 per cent year on year. The target for capacity addition during the 12th Five-Year Plan is 88,000 MW.
Promotion of energy-efficient transformers through a number of policy instruments, including Minimum Energy Performance Standards (MEPS), are the most powerful tools to shift the entire market to higher levels of efficiency and ensuring realisation of national benefits of cost-effective energy.
The relevant Indian standard for distribution transformers (DTs) IS:1180/1989 has been revised in the year 2014 as IS:1180 (Part1)/2014 by Bureau of Indian Standard (BIS) thereby superseding IS:1180 (Part 1 and 2)/1989 both for sealed and non-sealed type. In the revised version, the losses at 50 per cent and 100 per cent loading have been incorporated and the scope of the standard has been extended from 100 KVA to 2,500 KVA three-phase and single phase up to 25 KVA rating, at voltage (11 to 33 KV) have also been included to make it a comprehensive standard on DTs.
This standard further recommends multiple grading with regard to energy efficiency, i.e. three energy-efficiency levels: level 1, level 2 and level 3 of transformers corresponding to 3 star, 4 star and 5 star labelled transformers respectively, as prescribed by BEE (also as per CEA mandatory guidelines). It is, therefore, necessary that DTs will conform to IS1180 (Part 1):2014, which is the Indian Standard under mandatory certification for relevant energy-efficiency levels. More so, the DTs have also come under quality control order issued by Department of Heavy Industries on 27th January 2014 amended on 14th November 2014, mandating BIS certification/marking up to 2,500 KVA as per IS:1180 (Part 1)/2014 with effect from 1st February 2015. The standard ratings prescribed under the relevant tables will be adhered to, and non-standard ratings will not be permitted to manufacture, stored and used.
Also, India has adopted a mandatory labelling scheme launched by Bureau of Energy Efficiency (BEE) for specific types of liquid-filled, naturally air-cooled three-phase distribution transformers. It covers power ratings up to 200 kVA. Power utilities were mandated to procure at least a 3-starred distribution transformer. BEE is in the process of reviewing and enhancing the scope up to 2,500 kVA.
Programme by the International Copper Association India (ICA India) encourages utilities to reduce energy losses by adopting and implementing the specifications mentioned in the national standards. Power utilities may be initially paying more upfront for purchasing high-efficiency transformers, but lower losses of electricity across their life span lead to a higher return on investment. ICA India through its programme’s creates awareness among utilities, particularly on EE, reliability and quality of distribution transformers, and testing services from ERDA and CPRI. The association creates platforms for interaction of all the stakeholders to create a major thrust for market transformation towards EE and enlightening users about the benefits of life-cycle costing versus preference for lowest bid adopted at present, particularly when the cost of energy losses, failure risk and maintenance into account, as well as the investment cost and residual value of the transformer at retirement are taken into account.
ICA India has conducted conferences in partnership with Indian Transformers Manufacturers’ Association (ITMA) for promotion of EEDTs with the utilities encouraging them to adopt mandatory labelling notification and addressing reliability issues and failures.
The association has initiated a pilot project to scale up installation of high-efficient transformers and replacement of inefficient ones through a new business model, viz. performance-based DT managed services model, which will be demonstrated in a power utility and will focus on promoting the model concept through capacity building workshops in all state utilities.
Specifications for procurements of high-efficient transformers for new installations and replacements and government policies initiatives like the Energy Conservation Act, implementation of 12th Plan and Rural Electrification Programmes will drive the transformer market.
Authored by—Hemanth Kumar, Chief Manager,EE Motors & Transformers, International Copper Association India

Click to comment

You must be logged in to post a comment Login

Leave a Reply

High-efficiency distribution transformers

 High-efficiency transformers create economic benefits for the society. Besides reduced greenhouse gas emissions, they improve reliability and give potentially longer service life by bringing down temperature rises through energy-efficiency improvements. India has, by now, adopted the international IEC standards as well as introduced star labelling for selected categories of transformers.
According to Leonardo Energy – Transformers Report, 2005, the global transmission and distribution network losses will lead to global economic loss of more than $61 billion annually and annual greenhouse gas emissions of more than 700 million tonnes. It is estimated that one-third of network losses occur in transformers, and of these transformer losses, 70 per cent occur in distribution transformers. The report estimates that the total electricity lost on utility networks around the world in 2005 was about 1,279 TWh, and of that, distribution transformers consumed 298.4 TWh.
Most power losses occur in the transformer core made up of magnetic steel or in the electrical coils or windings of either aluminium or copper.
Copper reduces load loss, because it is a more efficient conductor. By reducing load loss, Copper wound transformers helps increase profit margins of power distribution companies. Besides, the smaller size of copper transformers saves core steel as well as structural elements, including the tank, oil, cooling equipment and other accessories. And copper being stronger than aluminium, the former withstands stresses better than aluminium, thus, extending the transformer’s life and reducing lifecycle maintenance costs.
The market size for transformers in 2013 was at 2,66,000 MVA in India and has seen an annual growth of 17 per cent year on year. The target for capacity addition during the 12th Five-Year Plan is 88,000 MW.
Promotion of energy-efficient transformers through a number of policy instruments, including Minimum Energy Performance Standards (MEPS), are the most powerful tools to shift the entire market to higher levels of efficiency and ensuring realisation of national benefits of cost-effective energy.
The relevant Indian standard for distribution transformers (DTs) IS:1180/1989 has been revised in the year 2014 as IS:1180 (Part1)/2014 by Bureau of Indian Standard (BIS) thereby superseding IS:1180 (Part 1 and 2)/1989 both for sealed and non-sealed type. In the revised version, the losses at 50 per cent and 100 per cent loading have been incorporated and the scope of the standard has been extended from 100 KVA to 2,500 KVA three-phase and single phase up to 25 KVA rating, at voltage (11 to 33 KV) have also been included to make it a comprehensive standard on DTs.
This standard further recommends multiple grading with regard to energy efficiency, i.e. three energy-efficiency levels: level 1, level 2 and level 3 of transformers corresponding to 3 star, 4 star and 5 star labelled transformers respectively, as prescribed by BEE (also as per CEA mandatory guidelines). It is, therefore, necessary that DTs will conform to IS1180 (Part 1):2014, which is the Indian Standard under mandatory certification for relevant energy-efficiency levels. More so, the DTs have also come under quality control order issued by Department of Heavy Industries on 27th January 2014 amended on 14th November 2014, mandating BIS certification/marking up to 2,500 KVA as per IS:1180 (Part 1)/2014 with effect from 1st February 2015. The standard ratings prescribed under the relevant tables will be adhered to, and non-standard ratings will not be permitted to manufacture, stored and used.
Also, India has adopted a mandatory labelling scheme launched by Bureau of Energy Efficiency (BEE) for specific types of liquid-filled, naturally air-cooled three-phase distribution transformers. It covers power ratings up to 200 kVA. Power utilities were mandated to procure at least a 3-starred distribution transformer. BEE is in the process of reviewing and enhancing the scope up to 2,500 kVA.
Programme by the International Copper Association India (ICA India) encourages utilities to reduce energy losses by adopting and implementing the specifications mentioned in the national standards. Power utilities may be initially paying more upfront for purchasing high-efficiency transformers, but lower losses of electricity across their life span lead to a higher return on investment. ICA India through its programme’s creates awareness among utilities, particularly on EE, reliability and quality of distribution transformers, and testing services from ERDA and CPRI. The association creates platforms for interaction of all the stakeholders to create a major thrust for market transformation towards EE and enlightening users about the benefits of life-cycle costing versus preference for lowest bid adopted at present, particularly when the cost of energy losses, failure risk and maintenance into account, as well as the investment cost and residual value of the transformer at retirement are taken into account.
ICA India has conducted conferences in partnership with Indian Transformers Manufacturers’ Association (ITMA) for promotion of EEDTs with the utilities encouraging them to adopt mandatory labelling notification and addressing reliability issues and failures.
The association has initiated a pilot project to scale up installation of high-efficient transformers and replacement of inefficient ones through a new business model, viz. performance-based DT managed services model, which will be demonstrated in a power utility and will focus on promoting the model concept through capacity building workshops in all state utilities.
Specifications for procurements of high-efficient transformers for new installations and replacements and government policies initiatives like the Energy Conservation Act, implementation of 12th Plan and Rural Electrification Programmes will drive the transformer market.
Authored by—Hemanth Kumar, Chief Manager,EE Motors & Transformers, International Copper Association India

Click to comment

You must be logged in to post a comment Login

Leave a Reply

Most Popular

To Top