Category Archives: Transformers

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Dry Type Substation Transformers Technical Features

Most transformer companies offer standard engineered products only, and ask the users to make it fit their applications. Also these companies can engineer the product both electrically and mechanically to fit virtually any application. Typically companies employ three winding styles for Special Design Dry Type transformers, based on kVA, voltage and BIL requirements. The ability to… Read More: Dry Type Substation Transformers Technical Features »

What is On Load Tap Changer OLTC in Transformers

A tap changer is a device fitted to power transformers for regulation of the output voltage to required levels. On-load tap-changers (OLTCs) are indispensable in regulating power transformers used in electrical energy networks and industrial applications. OLTC changer alters the turn ratios of the transformer on the system by altering the number of turns in… Read More: What is On Load Tap Changer OLTC in Transformers »

Medium Voltage Indoor Dry Type Transformers Rating, Rated Voltage, Frequency and Ratio

The rated voltage ratio of the transformers at no load normally is specified at 50 Hz, this being related to the principal tapping of the transformer. Tapping shall be provided on the primary winding to provide a ratio variation of +7.5% and –2.5% in steps of 2.5%. The tap charge mechanism is of the off load… Read More: Medium Voltage Indoor Dry Type Transformers Rating, Rated Voltage, Frequency… »

How To Measure Transformer Winding Resistance

Transformer winding resistance is very important factor for the life of any transformer, this test is part of type tests, routine tests and field tests. The purpose of winding resistance test is to determine the following: Calculation of the I2R losses in transformer. Calculation of winding temperature at the end of temperature rise test of transformer. As a benchmark… Read More: How To Measure Transformer Winding Resistance »

Transformer Installation Method Statement

How to install a transformer method statement

Prior to commencement of transformer installation work, all shop drawings will be processed and submitted for approval by consulting engineer. Shop drawings will include front and side views of the equipment, overall dimensions, components identity, components type and ratings, electrical characteristics, incoming and outgoings location details among others. Plant and Equipment Following equipment and tools… Read More: Transformer Installation Method Statement »

List of Tests Required for Dual Wound Transformers

Below is the list of some important transformer tests which are conducted on site before final testing and commissioning is planned. Insulation resistance test In this test the insulation resistance is measured by applying appropriate voltage across the terminals as mentioned below: HV to Earth + LV and ground is measured with 5kV test voltage… Read More: List of Tests Required for Dual Wound Transformers »