GB/T 3048.9-2007Test methods for electrical properties of electric cables and wires - Part 9: Spark test of insulated cores (English PDF)

Foreword

GB/T 3084 Test methods for electrical properties of electric cables and wires is divided into 14 parts as follows [Translator note. Parts 6 & 15 do not exist].

- Part 1: General;

- Part 2: Test of electrical resistivity of metallic materials;

- Part 3: Test of volume resistivity of semi conducting rubbers and plastics;

- Part 4: Test of DC resistance of conductors;

- Part 5: Test of insulation resistance;

- Part 7: Tracking resistance test;

- Part 8: AC voltage test;

- Part 9: Spark test of insulated cores;

- Part 10: Spark test of extruded protective sheaths;

- Part 11: Test for dielectric dissipation factor;

- Part 12: Partial discharge test;

- Part 13: Impulse voltage test;

- Part 14: DC voltage test;

- Part 16: Surface resistance test.

This part is part 9 of GB/T 3084.

This part replaces GB/T 3048.9-1994 Test methods for electrical properties of electric cables and wires - Part 9: Spark test of insulated cores and GB/T 3048.15-1992 Electric cables and wires - D.C. spark test method for insulated cores. This revision makes modifications based on GB/T 1.1-2000 Directives for Standardization - Part 1: Rules for the Structure and Drafting of Standards.

The main changes in this part, compared with GB/T 3048.4-1994 and GB/T 3048.15-1992, are as follows.

- The title of the standard in Chinese has been changed to "Test methods for electrical properties of electric cables and wires - Part 9: Spark test of insulated cores";

- The title of the standard in English has been changed to "Test methods for electrical properties of electric cables and wires - Part 9: Spark test of insulated cores";

- The general structure and layout of this part have been changed according to GB/T 1.1-2000.

1) Clause 1 is "scope" (Clause 1 in GB/T 3048.9-1994 and GB/T 3048.15-1992 edition; Clause 1 in this edition);

2) Clause 2 is "normative references" (Clause 2 in GB/T 3048.9-1994 edition; none in GB/T 3048.15-1992 edition, Clause 2 in this edition);

3) Clause 3 is "terms and definitions" (none in GB/T 3048.9-1994 and GB/T 3048.15-1992 edition, Clause 3 in this edition)

4) Clause 3 is "testing equipment" (Clause 3 in GB/T 3048.9-1994 edition; Clause 3 in GB/T 3048.15-1992 edition, Clause 4 in this edition);

5) Clause 5 is "sample preparation" (none in GB/T 3048.9-1994 edition and GB/T 3048.15-1992 edition; Clause 5 in this edition);

6) Clause 6 is "test procedure" (Clause 4 and 5 in GB/T 3048.9-1994 edition;

Clause 3 and 4 in GB/T 3048.15-1992 edition; Clause 6 in this edition);

7) Clause 7 is "test result and calculation" (Clause 6 in GB/T 3048.9-1994 edition;

Clause 5 in GB/T 3048.15-1992 edition and Clause 7 in this edition);

8) Clause 8 is "calibration of test equipment" (Clause 7 in GB/T 3048.9-1994 edition non in GB/T 3048.15-1992 edition).

9) Clause 9 is "test record" (none in GB/T 3048.9-1994 edition and GB/T 3048.15-1992, clause 9 in this edition);

- Some content, part including requirements, is deleted from Clause 1 "scope" (Clause 1 in GB/T 3048.15-1992; Clause 1 in this edition);

- Relevant standards are supplemented in Clause 2 "normative references" (Clause 2 GB/T 3048.9-1994; none in GB/T 3048.15-1992; Clause 2 in this edition);

- Clause 3 "terms and definitions" is added (none in GB/T 3048.9-1994 and GB/T 3048.15-1992; Clause 3 in this edition);

- The regulations on DC high voltage power supply ripples in Clause 4 "testing equipment" are changed (2.1 in GB/T 3048.15-1992, 4.4.2 in this edition);

- The test voltage is changed from the specified value to the recommended value in Clause 6 "test procedure" (Clause 4 in GB/T 3048.9-1994 and Clause 3 in GB/T Test methods for electrical properties of electric cables and wires - Part 9: Spark test of insulated cores

1 Scope

As for the spark test of insulated cores (electric wires), this part of GB/T3048 stipulates the terms and definitions, test facilities, specimen preparation, test procedures, test result and assessment, calibration of test facilities, and test records.

This part is suitable for testing the insulating layer quality of insulated cores of rubber and plastic insulated electric cables and wires; it can be used to implement the intermediate test and routine test of electric cables and wires. It cannot be used to test the insulation products of conducting cores made of non-conducting materials.

This part includes power frequency spark test and direct current spark test. That is to say, the test is implemented with power frequency spark machine and direct current spark machine. This part shall be used together with GB/T3048.1.

2 Normative references

The articles contained in the following documents have become the articles of this part when they are quoted in this part of GB/T 3048. For the dated documents so quoted, all subsequent modifications (including all corrections) or revisions made thereafter do not apply to this standard. However, the parties who reach an agreement according to this standard are encouraged to study whether the latest versions of these documents may be used. For the undated documents so quoted, the latest versions (including all modification sheets) apply to this document.

GB/T 2900.10-2001 Electrotechnical vocabulary - Electric cables (idt IEC 60050 (461).1984)

GB/T 3048.1 Test methods for electrical properties of electric cables and wires - Part 1: General

JB/T 4278.10 Verification procedure for test equipment of rubber plastic wire and cable - Part 10: Spark tester

3 Terms and definitions

a) The diameter of the bead shall be 2 to 5mm; the space between the two neighboring beads in one bead chain shall not be more than 2.5mm;

b) The loop is made of metal wire with the diameter of more than 0.8mm; and the outer diameter of the loop shall not be more than 5mm. If you choose oval or other forms, the vertical axis shall not be more than 5mm. For every 100mm long loop chain, the number of loops shall not be less than 20;

c) The beads or loops of the chain shall be distributed uniformly. The surface shall be smooth; and any rags which may scratch the tested insulated cores shall not exist on the surface. Moreover, every bead or loop shall be flexible and compassable. Bead chain or loop chain shall be cross-banding.

4 Test Facilities