Manish Kumar Saini has Published 922 Answers

What is an Autotransformer?

Manish Kumar Saini

Manish Kumar Saini

Updated on 14-Aug-2021 11:35:32

An autotransformer is a one winding transformer in which a part of the winding is common to both primary and secondary windings.An autotransformer has a single continuous winding with a tap point between the primary and secondary windings. The tap point can be adjusted to obtain the desired output voltage, ... Read More

What is a Current Transformer?

Manish Kumar Saini

Manish Kumar Saini

Updated on 14-Aug-2021 11:33:11

A current transformer (C.T.) is an instrument transformer which is used for the protection and measurement purposes in a power system. The C.T. is primarily used to measure high alternating currents in a power system.Construction of Current TransformerThe magnetic core of the current transformers is made up of thin laminations ... Read More

Transformer No-Load Current Wave Shape Considering Core Loss

Manish Kumar Saini

Manish Kumar Saini

Updated on 14-Aug-2021 11:30:59

A transformer needs less magnetic material if it is operated at a higher core flux density. Thus, from the economic point of view, a transformer is designed to operate in the saturation region of the magnetic core.When a sinusoidal voltage is applied to the primary winding of the transformer, then ... Read More

Transformer Inrush Current – Calculation and Theory

Manish Kumar Saini

Manish Kumar Saini

Updated on 14-Aug-2021 11:26:18

There is a sudden inrush of the primary current, when the transformer is initially energized and the maximum value of the magnetic flux is more than twice the normal value of the flux. Hence, due to the very high peak of the magnetising current, the core is driven far into ... Read More

Three-Phase Transformer Vector Groups – How are the Vector Groups Divided?

Manish Kumar Saini

Manish Kumar Saini

Updated on 14-Aug-2021 11:16:41

The three-phase transformer vector groups are divided into four main groups depending on the phase difference between the corresponding line voltages on the high-voltage and lowvoltage sides. The angle by which the line voltage on the low-voltage side lags behind the line voltage on the high-voltage side is called as ... Read More

Working Principle of a Three-Phase Transformer

Manish Kumar Saini

Manish Kumar Saini

Updated on 14-Aug-2021 11:13:30

A three phase transformer is required to step-up or step-down the three phase voltages in a power system. The 3-phase transformers can be constructed in one of the following ways −Three separate 1-phase transformers can be connected for the 3-phase operation. Such an arrangement is known as 3-phase bank of ... Read More

Three-Phase to Twelve-Phase Transformers: Circuit Diagram and Phasor Diagram

Manish Kumar Saini

Manish Kumar Saini

Updated on 14-Aug-2021 11:10:08

The circuit arrangement of the transformers for three-to-twelve phase transformation is shown in the figure.Here, two banks of three 1-phase transformers or two 3-phase transformers are required. In this connection, the secondary windings are arranged in the form of pair of double-star connections. The primary windings of one set of ... Read More

Testing of Transformer | Type Tests, Routine Tests and Special Tests of Transformer

Manish Kumar Saini

Manish Kumar Saini

Updated on 14-Aug-2021 11:04:20

An electrical transformer is tested at the transformer manufacturer premises and at the consumer’s site and also periodically in regular and emergency basis during its service life to confirm its specifications and performance.Types of Transformer TestsTests of transformer done at the manufacturer’s premises −Type testsRoutine testsSpecial testsTests of transformer done ... Read More

Different Types of Transformers and Their Applications

Manish Kumar Saini

Manish Kumar Saini

Updated on 13-Aug-2021 14:02:42

There are four main types of transformers viz.Distribution TransformersPower TransformersAutotransformersInstrument TransformersDistribution TransformersThe transformers which are used to step down the transmission voltage to the distribution voltage or the distribution voltage to a standard service voltage are known as distribution transformers. These transformers have variable load which is considerably less than ... Read More

DC Generator – Demagnetising and Cross Magnetising Conductors

Manish Kumar Saini

Manish Kumar Saini

Updated on 13-Aug-2021 14:02:19

When the load is connected to a DC generator, the load current flows through the armature conductors and set up a magnetic flux called armature flux. This armature flux is always 180° phase apart from the main field flux and distorts or opposes it. This opposition of armature flux on ... Read More

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