GB/T 31838.5-2021Solid insulating materials - Dielectric and resistive properties - Part 5: Resistive properties(DC method) - Volume resistance and volume resistivity of impregnation and coating materials (English PDF)
固体绝缘材料 介电和电阻特性 第5部分：电阻特性(DC方法) 浸渍和涂层材料的体积电阻和体积电阻率
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Issued by
State Administration for Market Regulation, China National Standardization Administration
Level / Type
National · Recommended
Issue date
May 21, 2021
Implementation date
December 1, 2021
Scope
GB/T 31838.5-2021 is the English-translated version of 固体绝缘材料 介电和电阻特性 第5部分：电阻特性(DC方法) 浸渍和涂层材料的体积电阻和体积电阻率.
GB/T 31838.5-2021 is the Chinese standard "Solid insulating materials - Dielectric and resistive properties - Part 5: Resistive properties(DC method) - Volume resistance and volume resistivity of impregnation and coating materials".
Its scope clause reads: This document specifies the test method for the volume resistance and volume resistivity of solid insulating materials under applied DC voltage.
This document is applicable to materials such as unsaturated polyester-based impregnating resins, environmental curing covering paints, and thermal curing impregnating varnishes. Its clauses include terms and definitions.
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Document preview — GB/T 31838.5-2021
National Standard of the People's Republic of China
- Classification
- K 15
Issued by: State Administration for Market Regulation, China National Standardization Administration
Contents
- Foreword
- Introduction
- 1 Scope
- 2 Normative references
- 3 Terms and definitions
- 4 Meaning
- 5 Test method
- 6 Report
- 7 Repeatability and reproducibility
1 Scope
This document specifies the test method for the volume resistance and volume resistivity of solid insulating materials under applied DC voltage.
This document is applicable to materials such as unsaturated polyester-based impregnating resins, environmental curing covering paints, and thermal curing impregnating varnishes.
2 Normative references
The contents of the following documents constitute the indispensable clauses of this document through normative references in the text. Among them, dated quotations
Only the version corresponding to that date is applicable to this document; for undated reference documents, the latest version (including all amendments) is applicable to
This document.
IEC 62631-3-1 Dielectric and resistance characteristics of solid insulating materials Part 3-1.Determination of resistance characteristics (DC method) Volumetric electricity
General method of resistance and volume resistivity (Dielectricandresistivepropertiesofsolidinsulatingmaterials-Part 3-1.
Determinationofresistiveproperties(DCmethods)-Volumeresistanceandvolumeresistivity-Gen- eralmethod)
ISO 1514 Paints and varnishes-Standard panels for testing
ISO 2808 Paints and varnishes-Determination of filmthick- ness)
3 Terms and definitions
The following terms and definitions apply to this document.
The terms and definitions used in this document in ISO and IEC can be found on the following website.
3.1 Volume resistance
The part of the insulation resistance determined by volume conductivity.
Note. The unit of volume resistance is expressed in ohm.
3.2 Volume resistivity
The volume resistance relative to the volume of the material.
Note 1.The unit of volume resistivity is expressed in ohm meters (ohm·m).
Note 2.For insulating materials, the volume resistivity is usually measured by applying electrodes on the sheet sample.
Note 3.According to IEC 60050-121, in electromagnetics, "conductivity" is defined as a scalar or tensor, and the product of the electric field strength in the medium is equal to the current density.
Degree, "resistivity" is defined as "when there is a reciprocal, the reciprocal of conductivity". When measuring with this method, the volume resistivity is possible in the volume of the measurement.
The average value of non-uniform resistivity also includes the influence of possible polarization phenomena on the electrode. […]
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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 17 pages — is available in the English PDF.
Referenced standards
Normative references
IEC 62631 · ISO 1514 · ISO 2808
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Related Standards
GB/T 31838.6-2021 — Solid insulating materials - Dielectric and resistive properties - Part 6: Dielectric properties(AC method) - Relative permittivity and dielectric dissipation factor(frequencies 0.1Hz~10 MHz)
GB/T 31838.4-2019 — Solid insulating materials -- Dielectric and resistive properties -- Part 4: Resistive properties (DC methods) -- Insulation resistance
GB/T 31838.7-2021 — Solid insulating materials - Dielectric and resistive properties - Part 7: Resistive properties(DC method) - Measurement of volume resistance and volume resistivity at elevated temperatures
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