NDLI: Analysis and research of digitized sampling characteristics in smart substations

Content Provider	IEEE Xplore Digital Library
Author	Bu Qiangsheng Liu Yu Yuan Yubo Gao Lei Li Peng
Copyright Year	2014
Description	Author affiliation: State Grid Jiangsu Electr. Power Co. Res. Inst., Nanjing, China (Bu Qiangsheng; Liu Yu; Yuan Yubo; Gao Lei; Li Peng)
Abstract	Digitized sampling adopts decentralized, independent sampling mode, which introduces a new problem of data synchronization to secondary system of substations, especially for relay protections. This paper analyzes the time delay of every sections in sampling and the causes of non-synchronized sampling data. It states two general applied data synchronization method in smart substations at present, one method is based on external synchronizing signal while the other is based on interpolation method for resampling. The paper also compares two important indexes of digital sampling, rated delay time and phase error. Then the paper presents two methods, steady-state indirect method and time-scale direct method, to measure sampling delay and in turn to solve the problems of data synchronization. The test data of practical project shows that both two methods are able to achieve microsecond precision, but time-scale direct method is more accurate and stable. At last, the paper gives some precautions and recommendations for application of digital sampling in smart substations.
Starting Page	1822
Ending Page	1827
File Size	830345
Page Count	6
File Format	PDF
ISBN	9781479950324
DOI	10.1109/POWERCON.2014.6993647
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2014-10-20
Publisher Place	China
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Delays Synchronization Instrument transformers Delay effects Substations Measurement uncertainty Time Scale Direct Method Data Synchronization Rated Delay Time Steady State Indirect Method
Content Type	Text
Resource Type	Article

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
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3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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