Common test methods for insulating and sheathing materials of electric and optical cables - Part 51: Methods specific to filling compounds - Drop point - Separation of oil - Lower te
1 General
1.1 Scope
This part of GB/T 2951 specifies the test methods for filling compounds of electric and optical cables used with telecommunications equipment, including cables used in ships and in offshore applications
This part of GB/T 2951 specifies the methods for drop-point, separation of oil, lower temperature brittleness, total acid number, absence of corrosive components, permittivity at 23 °C, d.c. resistivity at 23 °C and 100 °C.
1.2 Normative References
The following normative document contains provisions which, through reference in this text, constitute provisions of this part of GB/T 2951. For dated references, subsequent amendments to, or revisions of, any of these publications do not apply. However, parties to agreements based on this part are encouraged to investigate the possibility of applying the most recent edition of the normative document indicated below. For undated references, the latest edition of the normative document referred to applies.
GB/T 5654-2007 Insulating Liquids — Measurement of Relative Permittivity Dielectric Dissipation Factor (tanδ) and D.C. Resistivity (IEC 60247:2004, IDT)
2 Test Values
Any test requirements which are given in this part may be modified by the relevant cable standard to suit the needs of a particular type of cable.
3 Applicability
Conditioning values and testing parameters are either specified in the materials specifications or in the product specifications.
4 Drop-point
Note: These tests are intended for classification purposes only.
Foreword II
1 General
1.1 Scope
1.2 Normative References
2 Terms and Definitions
3 Test Values
4 Applicability
5 Type Tests and Other Tests
6 Pre-conditioning
7 Median Value
8 Tensile Strength and Elongation at Break After Conditioning at Elevated Temperature
8.1 General
8.2 Conditioning Procedure
8.3 Tensile Strength and Elongation Tests After Conditioning at Elevated Temperature
8.4 Expression of Results
9 Wrapping Test After Conditioning at Elevated Temperature
9.1 General
9.2 Conditioning Procedure
9.3 Test Procedure
9.4 Evaluation of Results
10 Wrapping Test After Thermal Ageing in Air
10.1 General
10.2 Apparatus
10.3 Sampling
10.4 Ageing Procedure
10.5 Test Procedure
10.6 Evaluation of Results
11 Mass Increase of Insulation
11.1 General
11.2 Sampling
11.3 Test Procedure
11.4 Calculation
Annex A (Normative) Long-term Stability Test
Annex B (Normative) Test Method for Copper-catalyzed Oxidative Degradation of Polyolefin Insulated Conductors [Oxidation Induction Time (OIT) Test]
