Maintenance of Transformer

A power transformer is most costly and essential equipment of an electrical transformer. So for getting high performance and long functional life of the transformer, it is desired to perform various maintenance activities. Not only that, a power transformer also requires various maintenance actions including measurement and testing of different parameters of the transformer. There…

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Vector Group Test of Power Transformer

Vector Group Test of Transformer The vector group of transformer is an essential property for successful parallel operation of transformers. Hence every electrical power transformer must undergo through vector group test of transformer at factory site for ensuring the customer specified vector group of transformer. The phase sequence or the order in which the phases…

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Type Test and Routine Test of Transformer

For confirming the specifications and performances of an electrical power transformer it has to go through numbers of testing procedures. Some tests are done at manufacturer premises before delivering the transformer. Mainly two types of transformer testing are done at manufacturer premises- type test of transformer and routine test of transformer. In addition to that…

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Restricted Earth Fault Protection of Transformer | REF Protection

REF Protection: An external fault in the star side will result in current flowing in the line current transformer of the affected phase and at the same time a balancing current flows in the neutral current transformer, hence the resultant current in the relay is therefore zero. So this REF relay will not be actuated…

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Air Core Transformer

If an alternating current is supplied to a coil, an alternating magnetic field is produced surrounding it. If another coil is brought inside this magnetic field, an alternating emf is induced across the second coil also as per Faraday’s law of electromagnetic induction. This induced emf in the second coil can be utilized to feed…

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Testing of current transformer

Current transformers are generally used to measure currents of high magnitude. These transformers step down the current to be measured, so that it can be measured with a normal range ammeter. A Current transformer has only one or very few number of primary turns. The primary winding may be just a conductor or a bus…

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Maintenance of power transformer

Power Transformer Transformer is the heart of any power system. Hence preventive maintenance is always cost effective and time saving. Any failure to the transformer can extremely affect the whole functioning of the organization. Important components in power transformer to consider for preventive maintenance: The best way of protecting a transformer is to have good…

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Periodic inspection & diagnostics of transformer

Transformer is a static device, thus it requires less attention but with proper Periodic inspection & diagnostics of transformer it would be possible to avoid the unwanted break down & frequent interval of schedule maintenance. As transformer is the heart of power network, the maximum availability of it and also to meet the full life…

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What are the factors to be consider for Specifying Transformer

Generally there are many factors to be consider for Specifying Transformer but the most important factors for specifying transformer is listed below, Kilo volt ampere (kVA) Rating Voltage Ratings, Ratio, and Method of Connection (Delta or Wye) Voltage Taps Typical Impedance Values for Power Transformers Insulation Temperature Ratings Insulation Classes Sound Levels Effects of Transformer…

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Capacitor Voltage Transformer CVT

In high and extra high voltage transmission systems, capacitor voltage transformers (CVTs) are used to provide potential outputs to metering instruments and protective relays. In addition, when equipped with carrier accessories, CVTs can be used for power line carrier (PLCC) communication. The details of CVT is given below:- Capacitor stack The capacitor stack is a…

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