JJF 1799-2020 English PDF

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JJF 1799-2020: Calibration Specification for Test Devices for Action Characteristics of Low Voltage Circuit Breakers
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Basic data

Standard ID: JJF 1799-2020 (JJF1799-2020)
Description (Translated English): Calibration Specification for Test Devices for Action Characteristics of Low Voltage Circuit Breakers
Sector / Industry: Metrology & Measurement Industry Standard
Classification of Chinese Standard: A55
Classification of International Standard: 17.220
Word Count Estimation: 21,242
Date of Issue: 2020
Date of Implementation: 2020-04-17
Issuing agency(ies): State Administration for Market Regulation

JJF 1799-2020: Calibration Specification for Test Devices for Action Characteristics of Low Voltage Circuit Breakers

---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 of Low Voltage Circuit Breaker Action Characteristics Test Bench) National Metrology Technical Specifications of the People's Republic of China Calibration specification for low-voltage circuit breaker operating characteristic test bench 2020-01-17 released 2020-04-17 implementation Issued by the State Administration for Market Regulation Low-voltage circuit breaker operating characteristics Test bench calibration specification Focal point. National Electromagnetic Metrology Technical Committee High Voltage Metrology Sub-committee Main drafting unit. Tianjin Tianchuan Electric Control Equipment Testing Co., Ltd. Tianjin Electric Research Institute Co., Ltd. Beijing Oriental Metrology and Testing Institute National Quality Supervision and Inspection Center for Electric Power Distribution Equipment Tianjin Telex Fuhua Technology Co., Ltd. Participated in the drafting. Baoji Synchronous Electric Co., Ltd. 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. Sun Ning (Tianjin Tianchuan Electric Control Equipment Testing Co., Ltd.) Geng Likai (Tianjin Electric Research Institute Co., Ltd.) Huang Xiaoding (Beijing Oriental Metrology and Testing Institute) Li Xin (Tianjin Tianchuan Electric Control Equipment Testing Co., Ltd.) Wang Chunwu (National Quality Supervision and Inspection Center for Electric Control and Distribution Equipment) Li Jieping (Tianjin Telex Fuhua Technology Co., Ltd.) Participating drafters. Gu Piji (Baoji Synchronous Electric Co., Ltd.)

table of Contents

Introduction (Ⅱ) 1 scope (1) 2 Terms and measurement units (1) 2.1 Delay test (1) 2.2 Transient test (1) 2.3 The area difference between the positive and negative half-waves of the first cycle (1) 2.4 Deviation value of crest factor (1) 3 Overview (1) 4 Measurement characteristics (1) 4.1 Output current (1) 4.2 Current duration (2) 4.3 Harmonic distortion(2) 4.4 The area difference between the positive and negative half-waves of the first cycle (2) 4.5 Deviation value of crest factor (2) 4.6 Output current stability (2) 5 Calibration conditions (2) 5.1 Environmental conditions (2) 5.2 Measurement standards and other equipment (2) 6 Calibration items and calibration methods (2) 6.1 Calibration items (2) 6.2 Calibration method (3) 7 Expression of calibration results (6) 7.1 Calibration certificate (6) 7.2 Data processing(6) 8 Recalibration interval (6) Appendix A Evaluation Example of Measurement Uncertainty (7) Appendix B Calibration Original Record Format (11) Appendix C Internal Page (Page 2) Format of Calibration Certificate (13) Appendix D Calibration Certificate Calibration Results Page (Page 3) Format (14)

Introduction

This specification is based on JJF 1071-2010 "Rules for the Compilation of National Metrology and Calibration Specifications", JJF 1059.1-2012 Compilation of "Evaluation and Expression of Measurement Uncertainty". This specification is released for the first time. Calibration specification for low-voltage circuit breaker operating characteristic test bench

1 Scope

This specification is applicable to the calibration of low-voltage circuit breaker operating characteristic test benches under power frequency.

2 Terms and units of measurement

2.1 Delay test delaytest Test to verify whether the delay characteristics of circuit breakers and other protective devices meet the requirements of the standard. 2.2 Instantaneous test Test to verify whether the instantaneous characteristics of circuit breakers and other protective devices meet the requirements of the standard. 2.3 The area difference between the positive and negative half-waves of the first cycle The difference between the area of the positive half-wave and the negative half-wave of the first sine wave is an index used to measure the asymmetry of the current. 2.4 Deviationofcrestfactor The ratio of the peak value to the effective value of the first cycle waveform deviates from the standard value (the standard value of the crest factor of the sine wave is 2) Percentage.

3 overview

The low-voltage circuit breaker action characteristic test bed (hereinafter referred to as the test bed) is a kind of overcurrent protection used to detect circuit breakers An instrument with electrical tripping characteristics. The test rig is divided into two types. time delay test rig and instantaneous test rig. Detection of overload conditions The test bench for the lower tripping characteristics is called the delay test bench; the test bench for detecting the tripping characteristics under short-circuit conditions is called the instantaneous test bench. Test bench. The test bench is mainly composed of voltage regulator, multi-magnetic circuit transformer, current measurement module, time measurement module and other parts. The test bench controls the output voltage of the multi-magnetic circuit transformer by adjusting the voltage of the voltage regulator, and outputs the delay or Instantaneous current value, and shows the tripping current and tripping time of the circuit breaker. The principle is shown in Figure 1. Figure 1 Schematic diagram of the test bench

4 Measurement characteristics

4.1 Output current The output current of the test bench should meet. ......

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