This part of GB/T 31838 specifies a method of test for the determination of volume resistance and volume resistivity of electrical insulation materials by applying a DC voltage.
2 Normative References
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
IEC 60212 Standard Conditions for Use Prior to and During the Testing of Solid Electrical Insulating Materials
IEC 60455 (all parts) Resin Based Reactive Compounds Used for Electrical Insulation
IEC 60464 (all parts) Varnishes Used for Electrical Insulation
IEC 61212 (all parts) Industrial Rigid Round Laminated Tubes and Rods Based on Thermosetting Resins for Electrical Purposes
ISO 868 Plastics and Ebonite — Determination of Indentation Hardness by Means of a Durometer (Shore Hardness)
3 Terms and Definitions
For the purposes of this document, the following terms and definitions apply.
3.1
volume resistance
the quotient of a direct voltage applied between two electrodes placed on two faces (opposite) of a specimen, and the steady-state current between the electrodes
Note: Volume resistance is expressed in the unit of ?.
3.2
volume resistivity
the quotient of a d.c. electric field strength and the steady-state current density within an insulating material. In practice it is taken as the volume resistance reduced to a cubical unit volume
Note 1: According to IEC 60050-121, “conductivity” is defined as “scalar or tensor quantity, the product of which by the electric field strength in a medium is equal to the electric current density” and “resistivity” as “the inverse of the conductivity when this inverse exists”. Measured in this way, the volume resistivity is an average of the resistivity over possible heterogeneities in the volume incorporated in the measurement; it includes the effect of possible polarization phenomena at the electrodes.
Note 2: For insulating materials, the volume resistivity is usually determined by means of measuring electrodes arranged on a sheet of the material.
Note 3: Volume resistivity is expressed in the unit of ?m.
3.3
stray current
leakage current in the earth or in metallic structures buried in the ground and resulting from their intended or unintended earthing
GB/T 31838.2-2019 The following standards are cited：
GB/T 31838.2-2019 Cited by the following standards：
