ASME 19.6-2018 pdf free

ASME 19.6-2018 pdf free.Electrical Power Measurements Performance Test Codes.
Terms provided in this Section are confined to those for which clarification is considered to improve the user’s grasp of intent.
2-2 DEFINITIONS
accuraLy doseiwss of agreement between a measured value and the true value.
accuracy class: guaranteed worst-case accuracy for all devices of a particular type, model, or design over their intended operating range. Usually refers to meters and instrument transformers. Accuracy of individual units may be much better than the class accuracy, but testing is required to discover the actual value.
active power (expressed in watts (W)I: amount of power delivered to the resistive component of a load. Active power is the only power that can perform useful work In a DC circuit, active power is volts multiplied by amps. In an AC circuit with sinusoidal waveforms, active power is RMS volts multiplied by RMS amps and the cosine of the phase difference between them. (See apparent power and reactive power,)
apparent p0 wer (expressed in volt-amperes (VA)J: total power that is delivered to a circuit that contains both resistive and reactive loads. Apparent power is the square root of the sum of the squares of the active and reactive powers. (See active power and reactive power.)
burden (instrument transformer): load connected to the secondary winding of an instrument transformer that determines the active and reactive power at the secondary terminals. The burden is expressed either as total ohms impedance with the effective resistance and reactance components or as the total volt-amperes and power factor at the specified value of current or voltage and frequency.
calibration: process of comparing the response of an instrument to a standard instrument over some measurement range and adjusting the instrument to match the standard, if appropriate. Data gathered during calibration may be used to establish correction or uncertainty factors. Alternately, for an instrument, the development of documentation that will show the difference between the Code and the instrument and the uncertainty of doing the comparison.
current transformer(C7’): instrument transformer that is used to reduce a high current to a proportionately lower current that may be safely applied to a measuring instrument.
energy (expressed in watt-hours (Wh)j: integral of active power with respect to time. One watt of power delivered continuously for 1 h delivers 1 Wh of energy.
instrument transformer: transformer that is intended to reproduce in its secondary circuit, in a definite and known proportion, the current or voltage of its primary circuit with the phase relations substantially preserved. An instrument transformer is used to convert potentially dangerous voltage or current levels to a safer level suitable for a measuring instrument.
marked ratio: ratio of a transformer’s rated primary value to the rated secondary value as stated on the nameplate. phase-angle correction factor (PACF): ratio of the true power factor to the measured power factor. The phase-angle correction factor corrects for the phase displacement of the secondary current or voltage, or both, due to the instrument transformer phase angle(s).
phase angle ofan instrument transformer (PA): phase displacement, in minutes of arc or radians, between the primary and secondary values, The phase angle of a current transformer Is designated by the Greek letter fi and Is positive when the current leaving the identified secondary terminal leads the current entering the identified primary terminal. The phase angle of a voltage transformer is designated by the Greek letter yand is positive when the secondary voltage leads the corresponding primary voltage.ASME 19.6 pdf download.