TRANSFORMADOR DE CORRIENTE TIPO DONA.

Aplicación:
Características:

Medición de corriente alterna con amperímetros analógicos o digitales, en tableros, controles de motor y arrancadores; servicio interior.

Pueden montarse sobre cables aislados o sobre barras de cobre.

http://webcache.googleusercontent.com/search?q=cache:U-Y5S1d...

Toroidal Type Current Transformers

In general there are three types of design and construction for current transformers. They all have a magnetic core or cores and one or more windings. The most common type is the toroidal or donut type which has no internal primary winding as such. The primary is the conductor in which the current is to be monitored. The primary conductor is simply placed through the window of the current transformer. The core in this type is a band of magnetic grade steel concentricly wound upon itself. This is an extremely efficient core design which has no breaks or gaps in the magnetic path.

http://www.crmagnetics.com/technical-references/instrument-t...

Current Transformers for Metering

When services are more than 200 amperes, transformer-rated meters are used. As the name implies, these types of meters use current transformers (CTs) to measure the current flow, or total power being consumed. The information is recorded by the meter.

In donut-type CTs, there are two conductors, or windings. The primary winding is the line conductor that passes through the center of the CT. The secondary winding is the multiple turns of magnet wire around the core.

http://energysentry.com/tech-tips/current-transformers-meter...

Current Transformer Basics - CT Measurement Device

Current Transformer Basics can be explained this way: Central to all of the AC power transducers is the measurement of current. This is achieved using a current transformer (CT), which is a "donut" shaped device through which the wire (is to be measured) is threaded.

A current transformer is a type of "instrument transformer" that is designed to provide a current in its secondary which is accurately proportional to the current flowing in its primary.

Current Transformers can be stated that power flow and provide electrical inputs to power production transformers and instruments. CTs produce either an alternating current or alternating voltage that is proportional to the measured current. There are two basic types of CTs: wound and toroidal. Wound current transformers consist of an integral primary winding that is inserted in series with the conductor that carries the measured current. Toroidal or donut-shaped CTs do not contain a primary winding. Instead, the wire that carries the current is threaded through a window in the toroidal voltage transformer.

https://www.electricityforum.com/iep/electrical-transformers...


Donut Current Transformers

• Donut and Terminal Style that Reduce High AC Current Signals to 5 AC Amperes
• Model 186 Reduces High AC Current Signals to 10 AC Volts
http://www.simpsonelectric.com/products/accessories/transfor...

http://www.brultech.com/current-sensors/