DL/T 1247-2013 in English

1 Scope

This standard specifies the artificial icing flashover test method on insulators of various lines and stations used in outdoor environment in ±1100kV or below DC system. The porcelain with surface coated with anti-pollution flashover coating, glass insulator or insulators equipped with auxiliary umbrella skirt may be implemented by reference to this standard.
This standard includes the icing flashover test method of energized and non-energized insulator strings.

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 normative document (including any amendments) applies.
GB/T 16927.1 High-voltage Test Techniques - Part 1: General Definitions and Test Requirements
GB/T 22707 Artificial Pollution Tests on High-voltage Insulators to Be Used on D.C. Systems
JB/T 6747 Artificial Pollution Test Method for High Tension Insulators Intended to Be Used in DC System Solid Layer Method

3 Terms and Definitions

For the purposes of this standard, the following terms and definitions apply.
3.1 Icing
Refers to the ice layer, ice pillar, icicle, etc. formed on insulator surface.
3.2 Unit test
Refers to the single process that the test piece with specified pollution severity passes through the icing process and specified DC test voltage is applied to this process for specified period or till flashover occurs.
3.3 Conductivity of icing water

Foreword I
1 Scope
2 Normative References
3 Terms and Definitions
4 Classification of Test Methods
5 Test Power Supply
6 Test Procedure of Flashover during the Ice Melting Process
7 Test Procedure of Flashover during the Icing Process
8 Flashover or Withstand Characteristic of Insulators
Appendix A (Informative) Structural Features of Different Types of Icing
Appendix B (Normative) Parameters of Glaze Type Icing Simulated in Climatic Chamber
Appendix C (Informative) Method for Determining the Reference Value of Icing Flashover Voltage According to Voltage-rising Method