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JJF 1878-2020 English PDF

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JJF 1878-2020: Calibration Specification for On-line Monitoring Devices of Capacitive Equipment
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Basic data

Standard ID JJF 1878-2020 (JJF1878-2020)
Description (Translated English) Calibration Specification for On-line Monitoring Devices of Capacitive Equipment
Sector / Industry Metrology & Measurement Industry Standard
Classification of Chinese Standard A55
Classification of International Standard 17.220
Word Count Estimation 22,254
Date of Issue 2020-11-26
Date of Implementation 2021-05-26
Quoted Standard DL/T 1562-2016
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 applies to the calibration of online monitoring devices for high-voltage electrical equipment with capacitive insulation structures (hereinafter referred to as "monitoring devices").

JJF 1878-2020: Calibration Specification for On-line Monitoring Devices of Capacitive Equipment

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Calibration Specification for On-line Monitoring Devices of Capacitive Equipment National Metrology Technical Specifications of the People's Republic of China Calibration specification for online monitoring device of capacitive equipment 2020-11-26 release 2021-05-26 implementation Issued by the State Administration for Market Regulation On-line monitoring device for capacitive equipment Calibration specification Focal point: National Electromagnetic Metrology Technical Committee High Voltage Metrology Sub-committee Main drafting unit: National High Voltage Metering Station State Grid Hubei Electric Power Co:, Ltd: Electric Power Research Institute State Grid Zhejiang Electric Power Co:, Ltd: Electric Power Research Institute Participating in the drafting: State Grid Shandong Electric Power Co:, Ltd: Electric Power Research Institute State Grid Tianjin Electric Power Co:, Ltd: Electric Power Research Institute State Grid Jiangsu Electric Power Co:, Ltd: Electric Power Research Institute State Grid Liaoning Electric Power Co:, Ltd: Electric Power Research Institute 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: Wang Siqi (National High Voltage Metering Station) He Jiahui (State Grid Hubei Electric Power Co:, Ltd: Electric Power Research Institute) Song Qihua (State Grid Zhejiang Electric Power Research Institute) Participating drafters: Wang Andong (State Grid Shandong Electric Power Co:, Ltd: Electric Power Research Institute) Liu Baocheng (State Grid Tianjin Electric Power Co:, Ltd: Electric Power Research Institute) Yong Ma (State Grid Jiangsu Electric Power Research Institute) Jin Xin (State Grid Liaoning Electric Power Research Institute)

table of Contents

Introduction (Ⅱ) 1 scope (1) 2 Reference documents (1) 3 Term (1) 4 Overview (1) 5 Measurement characteristics (2) 5:1 Reference voltage (2) 5:2 Full current (2) 5:3 Dielectric loss factor (2) 5:4 Electric capacity(2) 6 Calibration conditions (2) 6:1 Environmental conditions (2) 6:2 Measurement standards and auxiliary equipment (3) 7 Calibration items and calibration methods (3) 7:1 Calibration items (3) 7:2 Calibration method (4) 8 Calibration result expression (6) 8:1 Data processing (6) 8:2 Calibration certificate (6) 9 Recheck interval (7) Appendix A Calibration method of monitoring device after installation and in operation (8) Appendix B: Calibration Original Record Format (10) Appendix C Internal page format of calibration certificate (13) Appendix D Examples of Measurement Uncertainty Evaluation (16)

Introduction

JJF 1001-2011 "General Metrology Terms and Definitions", JJF 1059:1-2012 "Measuring Uncertainty Evaluation and Representation” and JJF 1071-2010 “Rules for the Compilation of National Metrology and Calibration Specifications” together constitute the foundation supporting this specification Series specifications: This specification refers to DL/T 1562-2016 "Calibration Specification for Capacitive Equipment Monitoring Device": This specification is released for the first time: Calibration specification for online monitoring device of capacitive equipment

1 Scope

This specification applies to online monitoring devices for high-voltage electrical equipment with capacitive insulation structures (hereinafter referred to as "monitoring devices"): Set”) calibration:

2 Reference documents

This specification refers to the following documents: DL/T 1562-2016 Calibration specification for capacitive equipment monitoring device For dated reference documents, only the dated version applies to the specification; for undated references The latest version (including all amendments) is applicable to this specification:

3 term

3:1 Capacitive equipment High-voltage electrical equipment with capacitive insulation structure: 3:2 Online monitoring device on-linemonitoringdevice A device used for continuous monitoring and measurement of high-voltage equipment without power failure: 3:3 (of the monitoring device) reference voltage (ofthemonitoringdevice) The voltage used as the phase reference when measuring the dielectric loss factor: This voltage is obtained through the secondary side of the voltage transformer: It is often power frequency 100V/3 or 100V: 3:4 totalcurrent The total current through the current acquisition unit of the monitoring device:

4 overview

The monitoring device measures the full current I, dielectric loss factor D and reference voltage U of the capacitive equipment, etc: To reflect the insulation status of capacitive equipment in real time: The monitoring device consists of a reference voltage acquisition unit, a full current acquisition unit, Signal processing and analysis unit, communication display unit: Its working principle is shown in Figure 1:

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