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JJF 2027-2023 English PDF

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JJF 2027-2023: Calibration Specification for Transformer Merging Unit Test Set
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JJF 2027-2023English689 Add to Cart 6 days [Need to translate] Calibration Specification for Transformer Merging Unit Test Set Valid JJF 2027-2023

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Basic data

Standard ID JJF 2027-2023 (JJF2027-2023)
Description (Translated English) Calibration Specification for Transformer Merging Unit Test Set
Sector / Industry Metrology & Measurement Industry Standard
Word Count Estimation 31,363
Date of Issue 2023-03-15
Date of Implementation 2023-09-15
Issuing agency(ies) State Administration for Market Regulation

JJF 2027-2023: Calibration Specification for Transformer Merging Unit Test Set

---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.
National Metrology Technical Specifications of the People's Republic of China JJF 2027-2023 Calibration specification for merging unit calibrator for transformer Released on 2023-03-15 2023-09-15 Implementation Released by the State Administration for Market Regulation Merging unit calibrator for transformer Calibration specification MergingUnitTestSet Responsible Unit: High Voltage Metrology Sub-Technical Committee of National Electromagnetic Metrology Technical Committee Main drafting unit: National High Voltage Metering Station State Grid Hubei Electric Power Co:, Ltd: Huazhong University of Science and Technology Participated in the drafting unit: Electric Power Research Institute of State Grid Henan Electric Power Company State Grid Hebei Electric Power Co:, Ltd: Electric Power Research Institute State Grid Heilongjiang Electric Power Co:, Ltd: Metering Center This specification entrusts the National Electromagnetic Metrology Technical Committee High Voltage Metrology Sub-Technical Committee to be responsible for interpretation The main drafters of this specification: Hu Haoliang (National High Voltage Metering Station) Xu Yan (State Grid Hubei Electric Power Co:, Ltd:) Li Dong (Huazhong University of Science and Technology) Participating drafters: Wanpeng (National High Voltage Metering Station) Xu Erqiang (Electric Power Research Institute of State Grid Henan Electric Power Company) Sun Chong (Electric Power Research Institute of State Grid Hebei Electric Power Co:, Ltd:) Palace Tour (Measurement Center of State Grid Heilongjiang Electric Power Co:, Ltd:)

Table of contents

Introduction (Ⅱ) 1 Scope(1) 2 References(1) 3 terms(1) 4 Overview(2) 5 Metrological characteristics(3) 5:1 Ratio difference indication error and phase difference indication error (3) 5:2 Clock period error(3) 5:3 Clock Frequency Stability(3) 5:4 Indication Error of Time Synchronization Error(3) 5:5 Sampling value message transmission time interval discrete value indication error (3) 5:6 Measurement repeatability(4) 5:7 Short-term stability (4) 6 Calibration conditions(4) 6:1 Environmental conditions (4) 6:2 Measuring standards and other equipment (4) 7 Calibration Items and Calibration Methods(4) 7:1 Calibration items(4) 7:2 Preparations before calibration (5) 7:3 Calibration method(6) 8 Calibration Results(9) 9 Recalibration interval(10) Appendix A Typical construction scheme of differential module (11) Appendix B Measurement Uncertainty Evaluation of Ratio Difference Indication Error and Phase Difference Indication Error (13) Appendix C Calibration Raw Record Format(18) Appendix D Calibration Certificate Inner Page Format (22)

Introduction

JJF 1071-2010 "Rules for Compilation of National Metrology Calibration Standards", JJF 1001-2011 "General Metrology Terminology and Definition", JJF 1059:1-2012 "Evaluation and Expression of Measurement Uncertainty" jointly constitute the support for the formulation of this calibration specification A foundational set of specifications for work: This specification is published for the first time: Calibration specification for merging unit calibrator for transformer

1 Scope

This specification applies to the calibration of the merging unit calibrator for transformers with a rated frequency of 50 Hz:

2 References

This specification references the following documents: JJF 1879-2020 Calibration specification for transformer merging unit DL/T 860:92 Power Automation Communication Network and System Part 9-2: Specific Communication Service Mapping (SCSM) - Sampled values based on ISO /IEC 8802-3 DL/T 1943-2018 On-site inspection specification for merged units DL/T 1955-2018 General Specifications for Merging Unit Testers for Metrology For dated references, only the dated version applies to this specification; for undated references document, its latest version (including all amendments) applies to this specification:

3 terms

The following terms and definitions defined in JJF 1879-2020, DL/T 1943-2018 and DL/T 1955-2018 apply to this specification: 3:1 Merging unit mergingunit Physical unit used for time-dependent combination of current/voltage data from secondary converters: NOTE: The combined unit can be a component of the transformer, or it can be a separate unit, for example installed in a control room: [Source: JJF 1879-2020, 3:1, modified] It is used in conjunction with the transformer with analog output, and all or part of it adopts AC voltage and AC current analog input merge unit: Note: The merging unit for transformer is also called the analog input merging unit: Using an external synchronization signal, using the sampling sequence number to realize the synchronization of sampling values: [Source: DL/T 1943-2018, 3:1, with revisions] No external synchronization signal is needed, and the sampling value synchronization is realized by using the delay compensation method: [Source: DL/T 1943-2018, 3:2, modified] unittestset It is used to calibrate the error of the calibrator, and it is usually composed of a differential module, a synchronization signal delay module, and a message generation module: The completed system (hereinafter referred to as the calibration system): Note: The calibration system can be a set of devices or a system composed of discrete components:

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