An instrument transformer used to accurately scale ac currents up or down, or to provide isolation. Generally used to scalelarge primary or bus currents to usable values for measuring (or control) purposes. The current measurement range is expressed as the ratio of full scale primary current to full scale secondary current. The primary winding is connected in series with the conductor carrying the current to be measured or controlled. There are two classification of current transformers. Window type and Wound Primary type. In Window type current transformers the primary winding is provided by the line conductor and is not an integral part of the transformer. In Wound Primary type the primary winding is an integral part of the transformers and usually consist of more that one turn. Wound Primary transformers are used in applications that require very high accuracies or where high voltage isolation is required.
A type of instrument transformer used to measure current.
A transformer whose secondary current is a precise fraction of its primary current. Using current transformers, high-current circuits can be measured with conventional meters. Abbreviation: CT.
Converts the current flowing in the consumer's mains to a level suitable for a meter. The current transformer has errors that have been measured and can be applied to calibrate the meter.
These are used to measure a load on a supply. They clamp round the cable and measure the EMF which is then converted into a current reading (A)
1) Instrument Transformer: Intended to have its primary winding connected in series with the conductor carrying the current to be measured or controlled. 2) Metering: Designed for use in the measurement or control of current. Its primary winding may be single turn or bus bar, and is connected in series with the load. 3) Power and Distribution Transformer: Intended to have its primary winding connected in series with the conductor carrying the current to be measured or controlled. (In window-type current transformers, the primary winding is provided by the line conductor and is not an integral part of the transformer.)
A transformer used in instrumentation to assist in measuring current. It utilizes the strength of the magnetic field around the conductor to form an induced current that can then be applied across a resistance to form a proportional voltage.