JJG 1180-2021_English: PDF (JJG1180-2021)
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Power Frequency Ground Impedance Testers for Large Grounding Grid
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| Standard ID | JJG 1180-2021 (JJG1180-2021) | | Description (Translated English) | | | Sector / Industry | Metrology & Measurement Industry Standard |
JJG 1180-2021
(The procedure of power frequency grounding tester for large grounding grid)
People's Republic of China National Metrological Verification Regulations
Large-scale grounding grid power frequency grounding impedance tester
Published on 2021-10-18
2022-04-18 Implementation
Released by the State Administration for Market Regulation
Large-scale grounding grid power frequency grounding impedance tester
Verification procedures
Focal Point. National Electromagnetic Metrology Technical Committee
Main drafting unit. National High Voltage Metering Station
Shandong Institute of Metrology
State Grid Hunan Electric Power Company Electric Power Research Institute
Participating in the drafting unit. Electric Power Research Institute of Guangdong Power Grid Corporation
Wuhan Kangda Electric Co., Ltd.
This regulation entrusts the National Electromagnetic Metrology Technical Committee to be responsible for the interpretation
The main drafters of this regulation.
Wang Haiyan (National High Voltage Metering Station)
Ma Xuefeng (Shandong Institute of Metrology)
Qi Fei (State Grid Hunan Electric Power Company Electric Power Research Institute)
Wang Siqi (National High Voltage Metering Station)
Participating drafters.
Li Qian (Guangdong Power Grid Corporation Electric Power Research Institute)
Wang Xinyan (Shandong Institute of Metrology)
Hu Xiaohui (Wuhan Kangda Electric Co., Ltd.)
content
Introduction (Ⅱ)
1 range(1)
2 References (1)
3 Terms and units of measurement(1)
4 Overview(1)
5 Measurement performance requirements (2)
5.1 Main measurement parameters (2)
5.2 Maximum allowable error and accuracy class(2)
5.3 Influence of auxiliary electrode grounding resistance (3)
5.4 Power frequency ground interference voltage rejection ratio (3)
6 General technical requirements (3)
6.1 Appearance(3)
6.2 Insulation resistance(4)
6.3 Dielectric strength(4)
7 Measuring Instrument Control (4)
7.1 Verification Conditions (4)
7.2 Verification items and verification methods (4)
7.3 Processing of Verification Results (7)
7.4 Verification Period(7)
Appendix A Verification Original Record Format (8)
Appendix B Verification Certificate/Inner Page Format of Verification Result Notification (Page 2) (11)
Appendix C Verification Certificate/Verification Result Notification Verification Result Page Format (Page 3) (12)
Appendix D Description, Calculation and Test Method of Engineering Ground Interference Voltage Rejection Ratio (14)
introduction
JJF1002-2010 "Rules for the Compilation of National Metrology Verification Regulations", JJF1001 "General Metrology Terms and Definitions",
JJF1059.1-2012 "Assessment and Representation of Measurement Uncertainty" together constitute the basis for supporting the preparation of this Regulation
specification.
This regulation is published for the first time.
Large-scale grounding grid power frequency grounding impedance tester verification rules
1 Scope
This regulation is applicable to the grounding of large-scale grounding grids with a working frequency of 45Hz~55Hz and a working current of not less than 1A.
The initial verification, subsequent verification and in-use inspection of an impedance tester or device (hereinafter referred to as the tester).
This regulation does not apply to battery-powered, hand-cranked generators and grounding resistance meters with analog indication.
2 Reference documents
This procedure cites the following documents.
GB/T 13978─2008 Digital Multimeter
GB 50169─2016 Code for construction and acceptance of grounding devices for electrical installation installation engineering
For dated citations, only the dated version applies to this Regulation; for undated citations
The latest version (including all amendments) applies to this regulation.
3 Terminology and units of measurement
3.1 ground impedance groundimpedance
The impedance between a given point and a reference point of an earthed system, installation or equipment at a given frequency.
[GB 50169-2016, definition 2.0.7]
3.2 Ground resistance groundresistance
The real part of the grounding impedance is the power frequency grounding resistance at power frequency.
[GB 50169-2016, definition 2.0.8]
Grounding devices for substations and high-voltage laboratories with voltage levels of 110kV and above, or with an installed capacity of.200MW
The grounding device of the above power plant, or the grounding grid (device) with an equivalent area of more than 5000m2.
3.4 rated current ratedcurrent
The current value at which the measuring device reaches its rated operating state.
When measuring the ground impedance, the resistances RC and RP between the auxiliary electrode and the ground, where RC is the auxiliary current electrode and
The resistance between the earth, RP is the resistance between the auxiliary voltage pole and the earth.
When the test current is not applied, the power frequency voltage between the auxiliary voltage pole of the tester and the grounding device under test.
A parameter that reflects the tester's ability to suppress power-frequency ground interference voltage, and its magnitude is determined by the power-frequency ground interference voltage suppression ratio
KE to quantify the characterization.
4 Overview
Large-scale grounding grid power frequency grounding impedance tester (device) is widely used to measure the power frequency of large-scale grounding grid (device).
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