Purpose of Shielded Isolation Transformer
A shielded transformer is a two-winding transformer, usually delta–star connected and serves the following purposes: – Voltage transformation from the distribution voltage to the equipment’s utilization voltage. – Converting a 3-wire… Read more
Aug 29, 2012 | By Edvard Csanyi
Power Transformer Construction – Windings
Continued from tech. article: Power Transformer Construction – Core The windings consist of the current-carrying conductors wound around the sections of the core, and these must be properly insulated, supported and… Read more
Aug 24, 2012 | By Edvard Csanyi
Power Transformer Construction – The Core
The construction of a power transformer varies throughout the industry. The basic arrangement is essentially the same and has seen little significant change in recent years, so some ofthe variations… Read more
Aug 23, 2012 | By Edvard Csanyi
Protecting Oil Type Transformer with Buchholz Relay
Buchholz relay is a gas-actuated relay installed in oil immersed transformers for protection against all kinds of faults. Named afteri ts inventor mr. Max Buchholz (1875–1956) in 1921, relay is used… Read more
Aug 16, 2012 | By Edvard Csanyi
Principles of Transformers in Parallel Connection (part 2)
Continued from first part – Principles of Transformers in Parallel Connection (1) All parallel units must be supplied from the same network. Secondary cabling from the transformers to the point… Read more
Aug 08, 2012 | By jiguparmar
Principles of Transformers in Parallel Connection
For supplying a load in excess of the rating of an existing transformer, two or more transformers may be connected in parallel with the existing transformer. The transformers are connected… Read more
Aug 06, 2012 | By jiguparmar
Delta-Star Transformer Connection Overview
In this type of connection, the primary connected in delta fashion while the secondary current is connected in star. The main use of this connection is to step up the… Read more
Jul 10, 2012 | By jiguparmar
Delta-Delta Transformer Connection Overview
In this type of connection, both the three phase primary and secondary windings are connected in delta as shown in the Figure 1: The voltages on primary and secondary sides… Read more
Jul 06, 2012 | By jiguparmar
Typical noise levels in power substation
Equipment noise levels may be obtained from manufacturers, equipment tendering documents, or test results. The noise level of a substation power transformer is a function of the MVA and BIL… Read more
Jul 05, 2012 | By Edvard Csanyi
Autotransformer Connection Explained
An ordinary transformer consists of two windings called primary winding and secondary winding. These two windings are magnetically coupled and electrically isolated. But the transformer in which a part of… Read more
Jul 02, 2012 | By jiguparmar
Meggering (insulation resistance testing) of dry-type power transformer
The insulation resistance test (meggering) is of value for future comparison and also for determining if the transformer is to be subjected to the applied voltage test.The winding insulation resistance… Read more
Jun 27, 2012 | By Edvard Csanyi
Transformer Extra Losses Due To Harmonics
Non-linear loads, such as power electronic devices, such as variable speed drives on motor systems, computers, UPS systems, TV sets and compact fluorescent lamps, cause harmonic currents on the network…. Read more
Jun 22, 2012 | By Edvard Csanyi
ZigZag Transformer Connection Overview
The zigzag connection of tranformer is also called the interconnected star connection. This connection has some of the features of the Y and the ∆ connections, combining the advantages of… Read more
Jun 15, 2012 | By jiguparmar
Scott-T Transformer Connection Overview
There are two main reasons for the need to transform from three phases to two phases: to give a supply to an existing two phase system from a three phase… Read more
Jun 12, 2012 | By jiguparmar
Star-Delta Transformer Connection Overview
In this type of transformer connection, then primary is connected in star fashion while the secondary is connected in delta fashion as shown in the Figure 1 below. The voltages… Read more
Jun 10, 2012 | By jiguparmar