JJF 1878-2020Calibration Specification for On-line Monitoring Devices of Capacitive Equipment (English PDF)

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 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: