1 Scope
This Part specifies the sample installation and test methods for general test of insulators.
This Part is applicable to the appearance and dimension inspection, shape and position deviation inspection, porosity test and temperature cycling test for porcelain and glass insulators (including sleeves, support insulators, insulating coat of electrical products, line insulator strings and their elements).
2 Normative References
The following normative documents contain provisions which, through reference in this Part of GB/T 775, constitute provisions of this standard. For dated references, subsequent amendments to (excluding amending errors in the text), or revisions of, any of these publications do not apply. However, all parties coming to an agreement according to this standard are encouraged to study whether the latest edition of the normative document is applicable. For undated references, the latest edition of the normative document applies.
Contents
Foreword
1 Scope
2 Normative References
3 Terms and Definitions
4 Appearance and Dimension Inspection
4.1 Appearance Inspection
4.2 Dimension Inspection
5 Inspection for Shape and Position Deviation
5.1 Parallelism Inspection of End Face
5.2 Planeness Inspection
5.3 Inspection for the Maximum Axial Displacement of Hole Circles
5.4 Straightness Inspection for Axes
5.5 Inspection for Umbrella Edge Deformation
5.6 Roundness Inspection
5.7 Angular Deflection Inspection for Installation Holes
5.8 Roughness Inspection
5.9 Other Test Methods for Shape and Position Deviation
6 Porosity Test
6.1 Preparation of Test Blocks
6.2 Preparation of Test Solution
6.3 Test Procedures
6.4 Result Judgment
7 Temperature Cycling Test
7.1 Test Water
7.2 Test Procedures
7.3 Result Judgment
