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JJF 1879-2020: Calibration Specification for Transformer Merging Units
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Calibration Specification for Transformer Merging Units
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JJF 1879-2020
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Basic data | Standard ID | JJF 1879-2020 (JJF1879-2020) | | Description (Translated English) | Calibration Specification for Transformer Merging Units | | Sector / Industry | Metrology & Measurement Industry Standard | | Classification of Chinese Standard | A55 | | Classification of International Standard | 17.220 | | Word Count Estimation | 38,352 | | Date of Issue | 2020-11-26 | | Date of Implementation | 2021-05-26 | | Quoted Standard | GB/T 20840.7-2007; GB/T 20840.8-2007; DL/T 281-2012; DL/T 282-2018; DL/T 860.92-2016 | | Regulation (derived from) | Announcement No. 57 (2020) of the State Administration for Market Regulation | | Issuing agency(ies) | State Administration for Market Regulation | | Summary | This standard is applicable to the standard of transformer combining unit that can receive (0��120) V, (0��6) A power frequency analog signal. | JJF 1879-2020: Calibration Specification for Transformer Merging Units---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Calibration Specification for Transformer Merging Units
National Metrology Technical Specifications of the People's Republic of China
Calibration specification for transformer merging unit
2020-11-26 release
2021-05-26 implementation
Issued by the State Administration for Market Regulation
Calibration specification for transformer merging unit
Focal point: National Electromagnetic Metrology Technical Committee High Voltage Metrology Sub-committee
Main drafting unit: National High Voltage Metering Station
China Electric Power Research Institute Co:, Ltd:
State Grid Jiangsu Electric Power Co:, Ltd: Electric Power Research Institute
Participating in the drafting: State Grid Zhejiang Electric Power Co:, Ltd: Electric Power Research Institute
State Grid Hubei Electric Power Co:, Ltd: Measurement Center
State Grid Shandong Electric Power Company Electric Power Research Institute
Huazhong University of Science and Technology
This specification entrusts the National Electromagnetic Measurement Technical Committee High Voltage Measurement Sub-Technical Committee to be responsible for the interpretation
The main drafters of this specification:
Xiong Qianzhu (National High Voltage Metering Station)
Hu Haoliang (China Electric Power Research Institute Co:, Ltd:)
Wang Zhongdong (State Grid Jiangsu Electric Power Co:, Ltd: Electric Power Research Institute)
Participating drafters:
Xu Lingjie (State Grid Zhejiang Electric Power Co:, Ltd: Electric Power Research Institute)
Li Jun (Measurement Center of State Grid Hubei Electric Power Co:, Ltd:)
Yang Jian (State Grid Shandong Electric Power Company Electric Power Research Institute)
Li Hongbin (Huazhong University of Science and Technology)
table of Contents
Introduction (Ⅱ)
1 scope (1)
2 Reference documents (1)
3 Term (1)
3:1 Merging Unit (1)
3:2 Merging unit calibrator (1)
3:3 Punctuality error (1)
4 Overview (1)
5 Measurement characteristics (2)
5:1 Time alignment error (2)
5:2 Punctuality error (2)
5:3 Discrete value released by sampled value message (2)
5:4 Voltage channel amplitude error (2)
5:5 Phase error of voltage channel(2)
5:6 Current channel amplitude error (2)
5:7 Phase error of current channel (2)
5:8 Short-term stability (3)
6 Calibration conditions (3)
6:1 Environmental conditions (3)
6:2 Calibration standards and other equipment (3)
7 Calibration items and calibration methods (3)
7:1 Calibration items (3)
7:2 Preparations before calibration (4)
7:3 Time synchronization error(5)
7:4 Punctuality error(5)
7:5 Discrete value released by sampled value message (6)
7:6 Basic error(6)
7:7 Short-term stability(7)
8 Calibration result expression (7)
9 Recalibration interval (8)
Appendix A Evaluation Example of Measurement Uncertainty (9)
Appendix B Calibration Original Record Format (14)
Appendix C Internal Page Format of Calibration Certificate (30)
Introduction
This specification is based on JJF 1071-2010 "Rules for the Compilation of National Metrology and Calibration Specifications", JJF 1059:1-2012 "Measurement
"Evaluation and Expression of Uncertainty in Measurement" was compiled:
This specification is released for the first time:
Calibration specification for transformer merging unit
1 Scope
This specification is applicable to transformer combining units that can receive (0~120)V, (0~6)A power frequency analog signals
standard:
2 Reference documents
This specification refers to the following documents:
GB/T 20840:7-2007 Transformer Part 7: Electronic Voltage Transformer
GB/T 20840:8-2007 Transformer Part 8: Electronic Current Transformer
DL/T 281-2012 merge unit test specification
DL/T 282-2018 Merger unit technical conditions
DL/T 860:92-2016 Power Automation Communication Network and System Part 9-2: Specific Communication Service Mapping
Shot (SCSM) --- sampling value based on ISO /IEC 8802-3
For dated reference documents, only the dated version applies to this specification; for undated references
The latest version (including all amendments) is applicable to this specification:
3 term
GB/T 20840:7-2007, GB/T 20840:8-2007, DL/T 281-2012 and DL/T 282-
The following terms and definitions defined in:2018 apply to this specification:
3:1 Merging unit mergingunit
A physical unit used to time-correlate the current/voltage data from the secondary converter: Merge unit
It can be a component of a transformer or a separate unit, for example, installed in a control room:
[GB/T 20840:8-2007, definition 3:4:2]
3:2 Merging unit calibrator mergingunitcalibrator
A test equipment used to test the amplitude error and phase error of the combined unit of the transformer:
3:3 punctualityerror
The second pulse or sampling synchronization pulse signal output by the transformer combining unit and the standard clock source synchronization pulse signal
The time difference between:
4 overview
The transformer merging unit receives analog signals output by multiple conventional transformers or electronic transformers:
The AC plug-in is converted into a small voltage signal, and then converted into a digital signal by the low-pass filtering of the ADC plug-in and the ADC sampling loop
The signal is connected to the CPU plug-in; at the same time, the transformer combining unit supports 1PPS, IRIG-B code (DC code) or
IEC 61588 time synchronization protocol, and adopts constant temperature crystal oscillator, and uses external time reference to control constant temperature crystal oscillator:
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