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116 Power Quality Monitoring Standards Standards are very important in the area of power quality monitoring Power quality levels must be defined consistently and characterized using the same methods if they are going to be compared from one site to another and from one system to another IEEE 1159 is the IEEE Working Group that coordinates the development of power quality monitoring standards The existing IEEE 1159 provides general guidelines and definitions for monitoring power quality, and there are three separate task forces that are working on more specific guidelines and requirements Much of this work is being coordinated with IEC activities so that the monitoring requirements can be more consistent internationally This section describes the most important IEEE and IEC standards These standards are a moving target as there are many groups working on new developments
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1161 IEEE 1159: Guide for power quality monitoring
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IEEE Standard 115915 was developed to provide general guidelines for power quality measurements and to provide standard definitions for the different categories of power quality problems These definitions were provided previously in Chap 2 and provide the basis for a common language in describing power quality phenomena Power quality monitoring equipment can use this language to correctly differentiate between different power quality variations and disturbances After publication of the basic monitoring guidelines, working groups were established for development of more advanced guides for power quality monitoring Three working groups were established Progress can be tracked at the IEEE 1159 website: http://grouperieeeorg/groups/1159/ The IEEE 11591 Working Group is developing guidelines for instrumentation requirements associated with different types of power quality phenomena These requirements address issues like sampling rate requirements, synchronization, A/D sampling accuracy, and number of cycles to sample The IEEE 11592 Working Group is developing guidelines for characterizing different power quality phenomena This includes definition of important characteristics that may relate to the impacts of the power quality variations (such as minimum magnitude, duration, phase shift, and number of phases for voltage sags) Example waveforms have been collected illustrating the importance of different characteristics of the power quality variations Recently, the work of the IEEE 11591 and 11592 Working Groups has been combined into a single task force and is being coordinated with the development on an international standard for characterizing
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Downloaded from Digital Engineering Library @ McGraw-Hill (wwwdigitalengineeringlibrarycom) Copyright 2004 The McGraw-Hill Companies All rights reserved Any use is subject to the Terms of Use as given at the website
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Power Quality Monitoring Power Quality Monitoring 519
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power quality variations with monitoring equipment IEC 61000-43016 (see Sec 1162) The IEEE 11593 Working Group is defining an interchange format that can be used to exchange power quality monitoring information between different applications IEEE developed the COMTRADE format for exchanging waveform data between fault recorders and other applications, such as relay testing equipment A more complete data interchange format is needed for power quality data, which can include harmonic spectra, rms envelopes, characterized power quality data, and statistical power quality data, as well as steady-state and disturbance waveforms The new Power Quality Data Interchange Format (PQDIF) has been defined, and the standard is being balloted at the time of this writing17 The common data interchange format will allow software developers to develop applications for analyzing power quality events and problems independently from the manufacturers of the actual power quality monitoring equipment
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1162 IEC 61000-4-30: Testing and Measurement Techniques Power Quality Measurement Methods
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IEC standards for monitoring power quality phenomena are provided in a series of documents with the numbers 61000-4-xx The individual standards in this series cover specific requirements for each type of power quality variation or concern For instance, IEC 61000-4-7 provides the specifications for monitoring harmonic distortion levels IEC 61000-4-15 provides the specifications for monitoring flicker, as previously described The overall requirements for characterizing power quality phenomena are summarized in a new standard that is just being completed within IEC (61000-4-30) This new standard refers to the appropriate individual standards (like 61000-4-7 and 61000-4-15) for detailed specifications where appropriate This standard provides detailed requirements for the measurement procedures and the accuracy requirements of the measurements Not all monitoring equipment will be able to meet the exact requirements of this standard As a result, two classes of measurement equipment have been defined which can both be considered compliant with the procedures of IEC 61000-4-30:
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Class A performance is for measurements where very precise accuracy is required Two instruments that comply with the requirements of class A should give the same results (within the specified levels of accuracy) for any of the types of power quality variations considered These instruments could be appropriate for laboratories or for special applications where highly precise results are required
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Downloaded from Digital Engineering Library @ McGraw-Hill (wwwdigitalengineeringlibrarycom) Copyright 2004 The McGraw-Hill Companies All rights reserved Any use is subject to the Terms of Use as given at the website
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