# IEEE 3004.1-2013 pdf free

**IEEE 3004.1**-2013 pdf free.IEEE Recommended Practice for the Application of Instrument Transformers in Industrial and Commercial Power Systems.

For the purposes of this document, the following terms and detinitions apply. The IEEE Standards Dictionary Online should be consulted for terms not defined in this clause.

burden: The load connected to the secondary terminals, which may be expressed as voltamperes and power factor at a specified value of current, total ohms impedance and power factor, or ohms of the resistance and reactive components.

composite error: The root-mean-square (rms) of the instantaneous difference between the actual primary current and the actual secondary current multiplied by the rated current transformer transformation error.

current transformer (CT): Transforms line current into values suitable for use with standard protective relays and meters while isolating these instruments from line voltages.

dynamic current rating (id,.): The crest value of the asymmetrical primary current which a current transformer must withstand without being damaged electrically or mechanically by the resulting electromagnetic forces with the secondary winding short-circuited.

knee-point voltage: (A) The voltage at which a line tangent to the secondary excitation characteristic, when drawn on log-log coordinates, is at an angle of 45° to the horizontal. (B) The rated-frequency secondary voltage above which a 10% increase in voltage results in an increase of 50% or more in exciting current. (adapted from IEC)

polarit: The instantaneous phase relationship between the currents flowing in the primary and secondary of a current transformer. In simple applications, polarity is not important, but it is a critical consideration whenever multiple current transformers are used in combination, or when the output of a current transformer is used in conjunction with the output of a voltage transformer.

rating: The rating of a current transformer consists of a primary current rating and an associated secondary current rating. These ratings arc related by the nominal transformation ratio of the current transformer, which is usually also the physical turns ratio of the transformer.

ratio correction factor (RCF): The ratio of the true, or measured, ratio of the current transformer to the marked, or nominal, ratio.IEEE 3004.1 pdf free download.