# IEEE 3002.8-2018 pdf free

**IEEE 3002.8**-2018 pdf free.IEEE Recommended Practice for Conducting Harmonic Studies and Analysis of Industrial and Commercial Power Systems.

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

The following definitions are adapted from IEEE Std 519TM.

harmonic (component) A component of order greater than one of the Fourier series of a periodic quantity.For example, in a 60 Hz system, the harmonic order 3, also known as the third harmonic, is 180 Hz.

interharmonic (component): A frequency component of a periodic quantity that is not an integer mutiple of the frequency at which the supply system is operating (c.g.. 50 Hz or 60 Hz). I-T product: The inductive infuence expressed in terms of the product of root mean-square current magnitude (I), in amperes, times its Telephone Influence Factor (TIF).

kV-T product: Inductive influence expressed in terms of the product of root mean- square voltage magnitude (V), in kilovolts, times its Telephone Influence Factor (TIF). maximum demand load current: This current value is established at the Point of Common Coupling and should be taken as the sum of the currents corresponding to the maximum demand during cach of the 12 previous months divided by 12.

notch: A switching (or other) disturbance in the normal power voltage waveform, lasting less than 0.5 cycles, which is initially of opposite polarity than the waveform and is thus subtracted from the normal waveform in terms of the peak value of the disturbance voltage. This includes complete loss of voltage for up to 0.5 cycles. notch depth: The average depth of the line voltage notch from the sine wave of voltage.

notch area: The area of the line voltage notch. It is the product of the notch depth, in volts, times the widh of the notch measured in microseconds.

Point ofCommon Coupling (PCC): Point on a public power supply system, ectrically nearest to a particular load, at which other loads are, or could be, connected. The PCC is a point located upstream of the considered installation.

pulse number: The total number of successive non-simultaneous commutations occurring within the converter circuit during each cycle when operating without phase control. It is also equal to the order of the principal harmonic in the direct voltage; that is, the number of pulses present in the dc output voltage in one cycle of the supply voltage. short-cireuit ratio: At a particular location, the ratio of the available short-circuit current, in amperes, to the

load current, in amperes.

Telephone Infuence Factor (TIF): For a voltage or current wave in an electric supply circuit, the ratio of the square root of the sum of the squares of the weighted root-mean-square values of all the sine-wave components (including alternating current waves both fundamental and harmonic) to the root mean-square value (unweighted) of the entire wave.

Total Demand Distortion (TDD): The ratio of the root mean square of the harmonic content, considering harmonic components up to the 50th order and specifically excluding interharmonics, to the maximum demand current expressed as a percent value. Harmonic components of order greater than 50 may be included when necessary.

Total Harmonic Distortion (THD): The ratio of the root mean square of the harmonic content, considering harmonic components up to the 50th order and specifically excluding interharmonics, to the fundamental component expressed as a percent value. Harmonic components of order greater than 50 may be included when necessary.

4. Introduction

This recommended practice discusses the basic concepts involved in studies of harmonic analysis of industrial and commercial power systems. The need for such an analysis, recognition of potential problems, corrective measures, required data for analysis, and benefits of using a computer as a tool in a harmonic analysis study are also addressed in this recommended practice.

Any devices with nonlincar voltage-current characteristics generate harmonics. The main sources of harmonics in industrial and commercial power systems are statice power converters used as rectifiers for various industrial processes and for other applications such as adjustable/variable speed drives, uninterruptible power system (UPS), chargers, switched-mode supplies, static frequency converter, cycloconverters, etc. Are furnaces and saturated magnetic devices are also harmonic sources. Since nonlinear devices represent an everincreasing percentage of the total load in industrial and commercial electrical power distribution systems, harmonic studies become an important part of overall system decsign and operation. Fortunately, the available software for harmonic analysis has also grown. Guidelines for the aceptance of harmonic distortion at Point of Common Coupling (PCC) level are defined in IEEE Std 519TM, and the interharmonic ffects to voltage flickers at other system levels are also discussed. By modeling power system impedances as a function of frequency and harmonic sources as injecting currents or forced voltages, a harmonic study can be made to dctermine the effect of the harmonic contributions from nonlinear loads on the voltages and currents in the power system.IEEE 3002.8 pdf download.