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Q.

What are INSTRUMENT TRANSFORMERS , name them ?

Tags: money, music, technology
Asked by truth exposed, 18 Jan '13 04:21 pm
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Answers (5)

1.

In electrical engineering, a current transformer (CT) is used for measurement of electric currents. Current transformers, together with voltage transformers (VT) (potential transformers (PT)), are known as instrument transformers.
Answered by LIPSIKA, 18 Jan '13 04:31 pm

 
  
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2.

A transformer is a static electrical device that transfers energy by inductive coupling between its winding circuits. A varying current in the primary winding creates a varying magnetic flux in the transformer's core and thus a varying magnetic flux through the secondary winding. This varying magnetic flux induces a varying electromotive force (EMF), or "voltage", in the secondary winding.

Transformers range in size from a thumbnail-sized coupling transformer hidden inside a stage microphone to huge units weighing hundreds of tons used in power stations, or to interconnect portions of power grids. All operate on the same basic principles, although the range of designs is wide. While new technologies have eliminated the need for transformers in some electronic circuits, transformers are still found in many electronic devices. Transformers are essential for high-voltage electric power transmission, which makes long-distance transmission economically practical. Examples are the
Alter ...more
Source: wikipedia
Answered by Josna, 18 Jan '13 04:28 pm

 
  
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3.

Installation transformers fall into one of two separate categories. The first is the potential transformer which supplies low value voltages to voltmeters. The PT is typically equipped with four terminals; two for the incoming high voltage and two for the reduced instrument voltage. The PT's incoming or primary leads are connected in parallel across the high tension supply. This means that it may be located remotely in control rooms although it can often be mounted in high tension starter panels where local voltage indication is required.
The second type is the current transformer. This instrument transformer variant measures current and is used to drive ammeters and overcurrent protection relays. The typical CT differs from its voltage-reliant sibling in that it is connected in series with the supply and typically utilizes an induced primary feed and not a direct connection. To achieve this, a CT is produced with a hole in its center through which a high tension cable runs. The curre ...more
Answered by jakir hussain, 18 Jan '13 04:37 pm

 
  
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4.

Current, voltage, isolation, HV, LV, GT,
Answered by Manoj Joshi, 18 Jan '13 04:34 pm

 
  
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5.

Step down
Answered by Jene, 18 Jan '13 04:30 pm

 
  
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