Significance of Polarity in Current Transformers
For certain kinds of measurements, even today, we need to know the correct polarity of the primary and secondary windings in current transformers... - K Sivakumar
PAMAS Offer Automatic Liquid Particle Counters
Particles in the transformer oil adversely affect the dielectric strength of the insulating oil. Depending on type, size and quantity of particles (metallic, water etc.), a flash-over could be generated, which can be hazardous…
Selection & Application Of Surge Arrester
Electrical equipment like transformer, generator, CTs, PTs and motor requires to be protected from over voltages. Surge arrester is used to protect these equipments from lightning and switching over voltages. Modern day’s surge arrester uses Metal oxide varistor as an active element and provides exceptional overvoltage protection to the equipment connected to the power system... - Abhijit Dhamale, P Kirushnaraj
Looking At The Transformer Kraft Paper
In the construction of a transformer, the most vulnerable is the paper insulation. The paper insulation begins to degrade from the day of installation. In this article, the importance of kraft paper and its process of manufacturing such as preparation, wet washing, pulping, screening, cleaning, refining, blending etc., have been presented… - Vishavdeep Jindal, Jashandeep Singh
Reduction Of Losses
Technical losses in Distribution Transformers (DTs) occur because of the physical nature of the equipment and infrastructure of the power systems, i.e., I2R or copper loss – in the conductor cables, transformers, switches etc., High Technical Losses (No Load & Load losses) persist in DTs of all major utilities across India – and their losses are very high when compared to the Ideal losses for the same capacity...
Thermal Performance Of Distribution Transformers
This article illustrates the thermal behaviour of transformer with respect to the temperature rise test – and also discusses various factors that influence the test results. The article is also focusing on the causes for transformer failure and with certain remedies to overcome them... - S. Arjuna Rao, G. Girija, Manikandan N, Swaraj Kumar Das
Keeping An Eye On Transformer Health
On-line dielectric condition monitoring of bushing and transformer insulation is essential for managing transformer health. MONTRANO continuously monitors the condition of insulation in bushings and transformers...
Significance Of Transformer Oil Monitoring
It is of vital importance to monitor the condition of transformer oil. Periodic testing of transformer oil is necessary to ensure safe, economical, trouble free and undisturbed power supply... - V. G. Patel, Jay B. Thakar
CTs In Electrical Diagnostics
The versatility and performance of Current Transformers (CTs) mean that many of the instruments used for testing and diagnostics of electrical insulation and earthing can be made smaller, lighter, safer, more reliable and less expensive... - Dr Stan Zurek
Moving forward with tan-delta high voltage insulation testing
Though recent tan-delta test sets in the market, which are widely used to assess insulation in high-voltage electrical apparatus, combine versatility with convenience, there is room for further improvement. - Vince Oppedisano
Aging Assessment Of Power Transformer Insulating Oil
The most expensive and important equipment in electric power system, power transformer plays a vital role in maintaining reliable and efficient electricity supply. The condition evaluation of insulating oil of power transformer is performed by oil contamination test and the Dissolved Gas Analysis (DGA) method... - Dr. Naveen Kumar Sharma, Dr. Yog Raj Sood, Dr. Rajnish Shrivastava
Aspects Of Loss Reduction
Though Distribution Transformer (DT) technical loss reduction can also be achieved through replacement of the DTs altogether, the cost of new DTs do not justify the savings from loss reduction...
Advance Energy Efficient Transformers Testing
To prove that the transformer meets customer’s specifications and design expectations, the transformer has to go through different testing procedures in manufacturer premises... - D A Suthar
“Distribution sector is the primary target where competition is more and volumes are large…”
PETE Hammond Power Solutions Pvt Ltd was started by K Linga Reddy (Chairman) with more than four decades of experience in Transformer Industry covering all aspects of Designing, Development, Manufacturing, Testing, Commissioning and Servicing and Managing Director K Ravi Krishna Reddy with more than two decades of experience in the same Industry. In an exclusive interview with Electrical India, Chairman Reddy is describing his company’s capability and business potential to P K Chatterjee. Excerpts...
“We would urge our potential customers to work closely with us to support and...
Born out of the research division of GEC Alsthom, M&I Materials Limited combines the proven pedigree of long-standing products with the R&D expertise to bring new solutions to market. The company is dedicated to manufacturing specialist materials for industry and science, and is the driving force behind a portfolio of its successful brands ă including APIEZON, METROSIL, MIDEL and WOLFMET. In an exclusive interview with Electrical India, Barry Menzies, Commercial Director-MIDEL transformers fluids, is giving an account of their company’s business to P K Chatterjee. Excerpts…
MAINTENANCE FREE HERMETICALLY SEALED TRANSFORMER
Since oil does not come in contact with external air, there is hardly any deterioration of oil over a period of time and hence such transformers are virtually maintenance free... - Mukesh D Mulchandani
Discrete Wavelet Transform Based Differential Protection for Power Transformers
Transformers are a critical and expensive equipment in the power system network. They function as a node to connect two different voltage levels. Hence, the availability of their service is vital in maintaining the continuous power supply to consumers. Since many decades, differential protection provides the best overall protection for a power transformer to protect against faults... - Narri Yadaiah, Nagireddy Ravi
Trends In The Standards For Dry Type Transformers
With the increasing use of Dry type transformers, it is important for the utilities and the regulators to have norms for losses for Dry type transformers – as we have norms for oil immersed transformers in form of star labelling programme... - Sailesh Purohit, Thomas Lim, Radoslaw Szewczyk
Case Studies Of The Transformers Failure Analyses
Collection of failure data is the first major task. In free repair service or in repair contract, very little effort is made by utilities to find out the root cause of failure, which could be one of the reasons why a damaged transformer is replaced by a new one without removing the cause of damage, leading to failure immediately or within a very short period... - Manish N Sinha, Palak Patel, Parth Shah, Maulik Doshi, Nishith Bhalodiya
High Efficiency Distribution Transformers
Due to use of better grade materials and optimum design, sudden failures are reduced along with lower cost of maintenance, leading to increased life expectancy. These benefits add up and balance against the inevitable increase in purchase cost – as additional copper in the windings and better materials in the core will be used in the manufacture of high efficiency transformers... - S V Varadarajan
