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JJG 1189.3-2022: Instrument Transformers - Part 3: Current Transformers in Power System
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| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| JJG 1189.3-2022 | English | 589 |
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Instrument Transformers - Part 3: Current Transformers in Power System
| Valid |
JJG 1189.3-2022
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Standard similar to JJG 1189.3-2022 JJG 1192 JJG 1189.4 JJF 1189 Basic data | Standard ID | JJG 1189.3-2022 (JJG1189.3-2022) | | Description (Translated English) | Instrument Transformers - Part 3: Current Transformers in Power System | | Sector / Industry | Metrology & Measurement Industry Standard | | Word Count Estimation | 30,340 | | Date of Issue | 2022-12-07 | | Date of Implementation | 2023-06-07 | | Issuing agency(ies) | State Administration for Market Regulation | JJG 1189.3-2022: Instrument Transformers - Part 3: Current Transformers in Power System---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 Verification Regulations of the People's Republic of China
Measuring transformer
Part 3.Power current transformers
Released on 2022-12-07
2023-06-07 Implementation
Released by the State Administration for Market Regulation
Measuring transformer
Part 3.Power current transformers
Verification Regulations
Transformers Part 3.Current
Replace JJG 1021-2007
Power current transformer part
Responsible Unit. High Voltage Metrology Sub-Technical Committee of National Electromagnetic Metrology Technical Committee
Main drafting unit. National High Voltage Metering Station
Participating in the drafting unit. Jiangsu Institute of Metrology
State Grid Jiangsu Electric Power Co., Ltd. Electric Power Research Institute
State Grid Sichuan Electric Power Company Metering Center
State Grid Qinghai Provincial Electric Power Company Electric Power Research Institute
Wuhan Pandian Technology Co., Ltd.
This regulation entrusts the High Voltage Metrology Sub-Technical Committee of the National Electromagnetic Metrology Technical Committee to be responsible for interpretation
The main drafters of this regulation.
Leimin (National High Voltage Metering Station)
Xiong Kui (National High Voltage Metering Station)
Participating drafters.
Pan Baoxiang (Jiangsu Institute of Metrology)
Huang Qifeng (Electric Power Research Institute of State Grid Jiangsu Electric Power Co., Ltd.)
Shi Qiang (Metering Center of State Grid Sichuan Electric Power Company)
Li Zhendong (Electric Power Research Institute of State Grid Qinghai Electric Power Company)
Sun Jun (Wuhan Pandian Technology Co., Ltd.)
Table of contents
Introduction (Ⅱ)
1 Scope(1)
2 References(1)
3 Terms and units of measurement(1)
4 Overview(2)
5 Metrological performance requirements (2)
5.1 Accuracy classes(2)
5.2 Basic error(2)
5.3 Cycle Stability(3)
5.4 Magnetic saturation margin(3)
6 General technical requirements (3)
6.1 Appearance and logo (3)
6.2 Winding Polarity(3)
6.3 Insulation resistance(3)
7 Measuring Instrument Control(4)
7.1 Test conditions (4)
7.2 Measurement standards and supporting equipment (4)
7.3 Verification items (5)
7.4 Verification method (5)
7.5 Processing of verification results (9)
7.6 Verification cycle (9)
Appendix A Current Transformer Open Circuit Demagnetization Method (10)
Appendix B Reactive Power Compensation Method for Current Transformer Error Test (11)
Appendix C Measuring Errors of Large Current Transformers Using Equal Ampere-Turn Method (14)
Appendix D Effect of Primary Return Conductor on Current Transformer Error (15)
Appendix E Verification Original Record Format (18)
Appendix F Inspection Certificate/Inner Page Format of Inspection Result Notification (Page 2) (21)
Appendix G Test Certificate/Test Result Notice Test Result Page Sample (Page 3) (22)
Introduction
JJF1002-2010 "Rules for Writing National Metrology Verification Regulations", JJF1001 "General Metrology Terms and Definitions"
Together with JJF1059.1-2012 "Assessment and Expression of Measurement Uncertainty", it forms the basis to support the revision of this regulation
Sex series norms.
This regulation is the third part of JJG 1189 "Measuring Transformers". "Measurement Transformer" is proposed to be composed of 9 parts
composition.
--- Part 1.Standard current transformers;
--- Part 2.Standard voltage transformers;
--- Part 3.Power current transformers;
--- Part 4.Power voltage transformers;
--- Part 5.Three-phase combined transformer;
--- Part 6.Harmonic current transformers;
--- Part 7.Harmonic voltage transformers;
--- Part 8.Wide range current transformers;
--- Part 9.Anti-DC current transformers.
This regulation replaces the power current transformer part of JJG 1021-2007 "Power Transformer", and is consistent with
Compared with JJG 1021-2007, the main technical differences are as follows.
--- Divide JJG 1021 into power current transformer, power voltage transformer and three-phase combined transformer
part;
---Deleted the content related to the poor operation;
---Deleted the relevant content of the power frequency withstand voltage test;
--- Added the relevant content of the digital comparison method, see 7.2 and 7.4;
--- Added the reactive power compensation method of the power supply during the field test, see Appendix B.
Release status of previous versions of this regulation.
---JJG 1021-2007.
Measuring transformer
Part 3.Verification Regulations for Power Current Transformers
1 Scope
This regulation applies to the first inspection of power frequency power current transformers installed in the power system for metering and measurement.
determination, follow-up verification and in-use inspection.
This regulation does not apply to electronic current transformers.
2 References
This procedure references the following documents.
JJG 169 Transformer calibrator
JJG 313 measuring current transformer
JJF1701.1 Measuring Transformer Type Evaluation Outline Part 1.Standard Current Transformer
For dated references, only the dated version applies to this regulation; for undated references
document, its latest version (including all amendments) applies to this regulation.
3 Terminology and units of measurement
The following terms and definitions apply to this procedure.
In the power system, it plays the role of electrical isolation and current transformation according to the ratio, and is used for electrical measurement, energy metering,
Automatic protection and other devices provide a transformer with a secondary current signal that is accurately proportional to the primary current signal.
3.2 Ratio difference ratioerror
The error introduced by the current transformer in the measurement due to the fact that the actual transformation ratio is not equal to the rated transformation ratio. current transformer
The ratio difference fI is calculated according to formula (1).
fI=
KI 2-I1
I1 ×
100% (1)
In the formula.
KI---rated transformation ratio of current transformer, dimensionless;
I1---primary current effective value, A;
I2---the effective value of the secondary current, A.
3.3 phase difference phasedisplacement
The phase difference between the primary current phasor and the secondary current phasor of the current transformer, the phasor direction is based on the ideal current mutual inductance
It is determined that the phase difference of the device is zero. When the secondary current phasor is ahead of the primary current phasor, the phase difference is positive, and the unit is usually
Expressed in minutes (') or centimeters (mrad).
When the rated transformation ratio of the tested current transformer and the standard current transformer is the same, the tested current transformer and the standard current transformer
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