maintenance of transformer

Maintenance of Transformer

Transformer: Transformer is static electrical machine. which is used to transfer power from one place to another place without changing the frequency. there are two different types of transformer used in electrical field. they are, power transformer lighting transformer power transformer used for transferring high voltages from generating station to substations. power transformer is most…

vector group test of transformer

Vector Group Test of Power Transformer

Power transformer: The power transformer used to transfer the high voltage supply from one place to another. the power transformer mostly used in power generating station and bulk industry areas. for requiring more power in industrial areas they are using parallel connection of power transformer. the parallel connection of transformer required vector group test for…

transformer routine testing

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…

neutral ground resistor

Neutral-Grounding-Resistor System

Neutral-Grounding-Resistor System Neutral-Grounding Resistors (NGRs) are used to ground power systems by inserting a resistor between the system neutral and ground. This lowers the prospective ground-fault current to a predetermined value. A properly designed resistance-grounded system provides benefits over both ungrounded and solidly grounded systems. Because the system is grounded, transient over voltages do not…

Motor-Soft-Starter

What is Motor soft starter

Motor soft starter A motor soft starter is a device used with AC electrical motors to temporarily reduce the load and torque in the power train and electric current surge of the motor during start-up. This reduces the mechanical stress on the motor and shaft, as well as the electrodynamic stresses on the attached power…

restricted earth fault

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…

air core transformer

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…

current transformer testing

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…

basic electrical

Basic Electrical interview Questions & Answers

1.What  is  electricity ? Ans : Electricity is a general term used for all phenomena caused by electric charge whether static or in motion. 2.What are the types of electricity ? Ans : There are two types,(1) static Electricity and (2) Current Electricity. 3.What is static electricity ? Ans : Static electricity means electricity at…

power transformer

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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