IEEE 519:2014 pdf free download – IEEE Recommended Practice and Requirements for Harmonic Control in Electric Power Systems
1.1 Scope
This recommended practice establishes goals for the design of electrical systems that include both linearand nonlinear loads.The voltage and current waveforms that may exist throughout the system aredescribed, and waveform distortion goals for the system designer are established. The interface betweensources and loads is described as the point of common coupling and observance of the design goals willminimize interference between electrical equipment.
This recommended practice addresses steady-statc limitations.Transient conditions exceeding theselimitations may be encountered.This document sets the quality of power that is to be provided at the pointof common coupling. This document does not cover the effects of radio-frequency interference; however,guidance is offered for wired telephone systems.
1.2 Purpose
This recommended practice is to be used for guidance in the design of power systems with nonlinear loads.The limits set are for steady-state operation and are recommended for“worst case”conditions. Transientconditions exceeding these limits may be encountered. In any case, the limit values given in this documentare recommendations and should not be considered binding in all cases.Because of the nature of therecommendations, some conservatism is present that may not be necessary in all cases.
This recommended practice should be applied at interface points between system owners or operators anduscrs in the power system.The limits in this recommended practice are intended for application at a pointof common coupling (PCC) between the system owner or operator and a user,where the PCC is usuallytaken as the point in the power system closest to the user where the system owner or operator could offerservice to another user. Frequently for service to industrial users (i.e., manufacturing plants) via a dedicatedservice transformer, the PCC is at the HV side of the transformer.For commercial users (office parks,shopping malls, etc.) supplied through a common service transformer, the PCC is commonly at the LV sideof the scrvice transformer.
The limits in this recommended practice represent a shared responsibility for harmonic control betweensystem owners or operators and users.Users produce harmonic currents that flow through the systemowncr’s or operator’s system which lead to voltage harmonics in the voltages supplied to other users. Theamount of harmonic voltage distortion supplied to other users is a function of the aggregate effects of theharmonic current producing loads of all users and the impedance characteristics of the supply system.
Harmonic voltage distortion limits are provided to reduce the potential negative effects on user and systemequipment. Maintaining harmonic voltages below these levels necessitates that
– All users limit their harmonic current emissions to reasonable values determined in an equitablemanner based on the inherent ownership stake cach user has in the supply system and
– Each system owner or operator takes action to decrease voltage distortion levels by modifying thesupply system impedance characteristics as necessary.
In order to allow the system owner or operator to control the system impedance characteristics to reducevoltage distortion when necessary，users should not add passive equipment that affects the impedancecharacteristic in a way such that voltage distortions are increased. In effect, such actions by a user couldamount to producing excessive voltage harmonic distortion.Such passive equipment additions (that lead toundesirable system impedance characteristics) should be controlled by the user in the same manner ascurrent harmonic-producing devices operated by the user.