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JJG 842-2017 English PDF

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JJG 842-2017: Electronic Meters for Measuring Direct-current Electrical Energy
Status: Valid

JJG 842: Evolution and historical versions

Standard IDContents [version]USDSTEP2[PDF] delivered inStandard Title (Description)StatusPDF
JJG 842-2017English649 Add to Cart 5 days [Need to translate] Electronic Meters for Measuring Direct-current Electrical Energy Valid JJG 842-2017
JJG 842-1993English479 Add to Cart 3 days [Need to translate] Verification Regulation of D.C Kilowatt-hour Meter Obsolete JJG 842-1993

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Basic data

Standard ID JJG 842-2017 (JJG842-2017)
Description (Translated English) Electronic Meters for Measuring Direct-current Electrical Energy
Sector / Industry Metrology & Measurement Industry Standard
Classification of Chinese Standard A55
Classification of International Standard 17.220
Word Count Estimation 28,283
Date of Issue 2017-09-26
Date of Implementation 2018-03-26
Older Standard (superseded by this standard) JJG 842-1993
Quoted Standard GB/T 16935.1-2008
Regulation (derived from) General Administration of State Quality Inspection Announcement 2017 No. 78
Issuing agency(ies) General Administration of Quality Supervision, Inspection and Quarantine
Summary This standard applies to the first verification and subsequent verification of electronic (static) DC energy meters. For electric energy meters with other functions, the same verification project implements this standard. It is not applicable to the verification of DC standard electric energy meters and the on-site verification of electronic DC energy meters (hereinafter referred to as electric energy meters).

JJG 842-2017: Electronic Meters for Measuring Direct-current Electrical Energy

---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.
(Electronic DC meter test procedures) People's Republic of China National Metrological Verification Procedures Electronic DC energy meter 2017-09-26 Posted 2018-03-26 implementation General Administration of Quality Supervision, Inspection and Quarantine released Electronic DC meter verification procedures Replacing JJG 842-1993 The focal point. National Electromagnetic Measurement Technical Committee The main drafting unit. Measurement and Testing Institute of Hunan Province Changsha Tianheng Measurement and Control Technology Co., Ltd. Participate in the drafting unit. Liaoning Province Institute of Metrology Wasion Group Co., Ltd. State Grid Hunan Power Company technical skills training center The rules entrusted the National Electromagnetic Measurement Technical Committee responsible for the interpretation The main drafters of this procedure. Li Qingxian (Hunan Institute of Metrology and Measurement) Xie Xiaojun (Hunan Institute of Metrology and Measurement) Zhou Xinhua (Changsha Tianheng Measurement and Control Technology Co., Ltd.) Participate in the drafters. Song Wentao (Hunan Institute of Metrology) Tang Hong (Liaoning Province Institute of Metrology) Ma Liang (Weisheng Group Co., Ltd.) Huang Jusuo (State Grid Hunan Power Company Technical Skills Training Center)

table of Contents

Introduction (Ⅱ) 1 Scope (1) 2 References (1) 3 Terms (1) 3.1 direct access to the DC energy meter (1) 3.2 indirect access to DC energy meter (1) 3.3 A class of electronic DC power meter (1) 3.4 B-type electronic DC power meter (1) 4 Overview (1) 5 measurement performance requirements (2) 5.1 Basic error (2) 5.2 Potential (3) 5.3 start (3) 5.4 Instrument constant (3) 5.5 clock day timing error (3) 6 General technical requirements (3) 6.1 mark (3) 6.2 Insulation resistance (4) 6.3 AC power frequency voltage test (4) 7 measuring instruments control (4) 7.1 first test, follow-up test (4) 7.2 test conditions (4) 7.3 test items (6) 7.4 Test Method (6) 7.5 Verification Results Processing (11) 7.6 Verification Period (12) Appendix A Verification Wiring Diagrams (13) Appendix B Verification of Original Record Formats (14) Appendix C Certificate of Conformity/Certificate Result Page Layout (Page 2) (17) Appendix D Verification Certificate/Verification Result Notification Verification Result Page Style (Page 3) (18)

Introduction

The rules based on JJF1002-2010 "national measurement verification rules writing rules" prepared. This regulation is revised on the basis of JJG 842-1993 "DC Energy Meter". With JJG 842-1993 In addition, the procedures in addition to editorial changes, the technical part of the changes are as follows. --- Procedure name from the original DC energy meter to electronic DC energy meter; --- For the first time electronic DC meter (also known as static DC meter) for the test, follow-up test, Not suitable for on-site verification; --- Increased the timing error of the project; --- Modify the accuracy level and error limits; --- Increased the basic error test under the reference current conditions; --- Increase the load current is less than 0.1Ib accuracy requirements; --- Modify the potential test voltage applied; --- Modify the starting test applied voltage and starting current value; --- Modify the AC voltage applied voltage test voltage value; --- Modify the electronic DC meter calibration cycle; --- Added test wiring diagram. This version of the previous version of the release. --- JJG 842-1993 "DC energy meter." Electronic DC meter verification procedures

1 Scope

This code applies to the electronic (static) DC meter first test, follow-up test. For power meters with other functions, perform the same procedures for this test item. Not applicable to the verification of DC standard watt-hour meters and the site of electronic DC watt-hour meters (hereinafter referred to as watthour meters) Test.

2 reference documents

The procedures cited in the following documents. GB/T 16935.1-2008 Insulation coordination of equipment in low-voltage systems - Part 1. Principles, requirements and tests Test (IEC 60664-1.2007, IDT) For dated references, only the dated version applies to this edition; any undated reference The latest version (including all amendments) applies to this procedure.

3 Terms

3.1 direct access to the DC energy meter directconnectedmetersformeasuringdirect-current electricalenergy The voltage and current measuring elements are connected directly to the watt-hour meter in the dc line under test. 3.2 indirect access to the DC energy meter indirectconnectedmetersformeasuringdirect-current electricalenergy The voltage or current measuring element is connected to the watt-hour meter of the DC line under test via one or more conversion devices, It can be a DC transmitter, a voltage divider, or a splitter, or it can be used in combination. Indirect access straight Flow meter in accordance with the transformation of the conversion of electrical parameters into current and voltage type. 3.3 A type of electronic DC energy meter electronicmetersformeasuringdirect-currentelectrical energy (typeA) Power meters powered by independent power supplies. 3.4 B type electronic DC energy meter electronicmetersformeasuringdirect-currentelectrical energy (typeB) Energy meter powered by voltage measurement circuit.

4 Overview

Produced by the direct current (or the voltage representing the DC current) and the DC voltage acting on the solid (electronic) components Measured with the electrical energy output proportional to the instrument, called the electronic DC energy meter. According to access methods can be divided into direct access Energy meter and indirect access meter two categories. The principle block diagram shown in Figure 1 and Figure 2.

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