IEEE 1159-2009 pdf free

IEEE 1159-2009 pdf free.lEEE Recommended Practice for Monitoring Electric Power Quality.
3.10 short-duration root-mean-square (mis) ariatIon: A Variation of the mis value of the voltage or current from thc nominal for a lime greater than 0.5 cycles of the power frequency but less than or equal to I mm. When the mis variation is voltage, it can be further described using a modifier indicating the magnitude of a voltage variation (e.g., sag. swell, intemtption) and possibly a modifier indicating the duraLion of the variation (e.g.. instantaneous, momentary, temporaiy).
3.11 sustained interruption: A type of long-duration root-mean-square (mis) voltage variation where the complete loss of voltage ( 0.1 pu) on one of more phase conductors is for a time greater than I mm.
3.12 temporary interruption: A type of short-duration root-mean-square (mis) variation where the complete loss of voltage (.O. I pu) on one or more phase conductors is for a time period between 3 s and 1 mm.
3.13 voltage change: A variation of the root-mean-square (mis) or peak value of a voltage between two consecutive levels sustained for definite but unspecified durations.
3.14 voltage fluctuation: A series of voltage changes or a cyclical variation of the voltage envelope.
3.15 voltage interruption: The disappearance of the supply voltage on one or more phases. It is usually qualified by an additional term indicating the duration of the interruption (e.g., momentary, temporary. sustained).
3.16 waveform distortion: A steady-state deviation from an ideal sine wave of power frequency principally characterized by the spectral content of the deviation.
4. Power quality phenomena
4.1 Introduction
The term pmrer quality refers to a wide variety of electromagnetic phenomena that characterize the voltage and current at a given time and at a given location on the power system. This chapter amplifies the definitions of Clause 3 and the glossary in Annex B by providing technical descriptions and examples of the principal electromagnetic phenomena causing power quality problems.
The increasing application of electronic equipment that can cause electromagnetic disturbances, or which can be sensitive to these phenomena. has heightened the interest rn power quality in recent years. Accompanying the increase in operation problems has been a variety of attempts to describe the phenomena. Unfortunately, different segments of the electronics and power systems community have utilized ditTerent terminologies to describe electromagnetic events. This clause expands the terminology that will be used by the power quality community to describe thcsc common events. The clause also oilers explanations of why commonly used terminology in other conimunities will not be used by the power quality community.IEEE 1159 pdf download.