Category Archive for: «Transformers»

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Inspection and Test procedures for Instrument Transformers

Procedures to follow: Visual and Mechanical Inspection Electrical Tests: Electrical Tests – Current Transformers Electrical Tests – Voltage Transformers Electrical Tests – Coupling-Capacitor Voltage Transformers Electrical Tests – High-Accuracy Instrument Transformers (Reserved) Test Values: Test Values: Visual and Mechanical Test Values: Current Transformers – Electrical Test Values:Voltage Transformers – Electrical Test Values: Coupling Capacitor Voltage […]

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Testing of power transformer – Measurement of impedance voltage and load loss

Purpose of the measurement The measurement is carried out to determine the load-losses of the transformer and the impedanse voltage at rated frequency and rated current. Apparatus and measuring circuit On Figure 1 above (Circuit for the impedance and load-loss measurement) there are following figures: G1 – Supply generator T1 – Step-up transformer T2 – […]

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Testing Procedures for HV Voltage Transformers

Content: Equipment required for testing General inspection Insulation Resistance Test Polarity Test Transformer Turns ratio test 1. Equipment required Following equipment is necessary to perform testings: Polarity test kit Megger 500-5000V Ohmmeter Multimeter Autotransformers & Step-up transformers Go up to the Content 2. General inspection Mechanical checks General visual inspection and compliance with the drawings […]

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How challenging can be transporting of a Large Power Transformer (LPT)

Safe and efficient transportation… Transporting an Large power transformer (LPT) can be quite challenging. LPTs large dimensions and heavy weight pose unique requirements to ensure safe and efficient transportation. Current road, rail, and port conditions are such that transportation is taking more time and becoming more expensive. Although rail transport is most common, LPTs cannot […]

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Power Transformer Capacitance and Dissipation Factor Test

Transformer insulation system The capacitance and dissipation factor test is an AC low voltage maintenance test and is very similar to the power factor test. While the transformer preparation is identical to the power factor test procedure, there is no requiremnts to make connection changes once the initial test set connections are made. High-voltage winding […]

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Power Transformer Turns Ratio Test

Turns ratio between the windings The turns ratio test is an AC low voltage test which determines the ratio of the high voltage winding to all other windings at no-load. The turns ratio test is performed on all taps of every winding. Voltage is applied on the H marked leads and measured of the X […]

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Economic Evaluation of Transformer Losses

Transformer’s cost Transformer losses represent power that cannot be delivered to customers and therefore have an associated economic cost to the transformer user/owner. A reduction in transformer losses generally results in an increase in the transformer’s cost. Depending on the application, there may be an economic benefit to a transformer with reduced losses and high price (initial cost), […]

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An overview of Large Power Transformer – LPT (Characteristics, Costs and Pricing)

Tailored to customers’ specifications An LPT (Large Power Transformer) is a large, custom-built piece of equipment that is a critical component of the bulk transmission grid. Because LPTs are very expensive and tailored to customers’ specifications, they are usually neither interchangeable with each other nor produced for extensive spare inventories. Figure 1 illustrates a standard […]

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8 Important Checks To Do Before Powering Up The Dry-Type Transformer

8 Obligatory Checks The transformer should be powered up only after checking the following 8 items: 1st Check (name plate ratings) Make sure the name plate ratings are in accordance with the ratings foreseen for the place of installation. 2nd Check (parallel operation) When transformers are to be operated in parallel, make sure they are […]

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Dry-Type Transformer Installation and Ventilation Requirements

Installation Dry-type transformers should be installed over foundations that are properly leveled and capable to withstand their weight. When a transformer is fitted with wheels, make sure the equipment will be equally supported on its base points in order to assure its stability and to prevent any deformation. When installing the transformer, the following factors […]

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