GB/T 311.2-2013
Insulation co-ordination.Part 2:Application guide (English Version)

Standard No.

GB/T 311.2-2013

Language

Chinese, Available in English version

Release Date

2013

Published By

General Administration of Quality Supervision, Inspection and Quarantine of the People‘s Republic of China

Latest

GB/T 311.2-2013

Replace

GB/T 311.2-2002

Scope

This part of GB/T 311 will provide guidance for the correct implementation of GB 311.1-2012 "Insulation Coordination Part 1: Definitions, Principles and Rules", so as to economically and reasonably determine the requirements of power transmission and transformation equipment or complete sets of equipment in three-phase AC power systems. Rated withstand voltage, select the standard insulation level corresponding to the highest voltage U_m of the equipment. This part corresponds to GB 311.1-2012 and is applicable to phase-to-ground insulation, phase-to-phase insulation and longitudinal insulation of high-voltage AC power transmission and transformation equipment, and is divided into two ranges according to the highest voltage of the equipment, namely range I and range II. The correlation with the highest voltage of the equipment is only for the purpose of insulation coordination. This section does not include the requirements for the safety of personnel. This section applies to three-phase AC systems with a nominal voltage above 1 kV, and the values given or recommended are generally only applicable to these systems. However, the basic principles provided are also applicable to two-phase and single-phase power systems. In the guidelines, it is emphasized that it is necessary to study insulation coordination in combination with specific projects to reasonably determine the insulation level, which is more meaningful for scope II equipment. This section does not consider routine tests, which are specified by the relevant equipment committees. The content of this part strictly follows the insulation coordination procedure given in GB 311.1-2012 (Figure 1 in GB 311.1-2012). Chapters 2 to 5 of this part correspond to the corresponding frames in Figure 1 of GB 311.1-2012, giving detailed information on how to master the principles of insulation coordination procedures and obtain the required withstand voltage. This section emphasizes that at the initial stage of the insulation coordination program, all causes, classifications and types of applied voltages in operation must be fully considered, regardless of the range of the highest voltage of the equipment (range I, range II). Only in the final stage of the program, when selecting the standard (rated) withstand voltage, the principle of using the standard withstand voltage to cover the special operating action voltage is adopted, and the standard insulation level in GB 311.1-2012 and the maximum voltage of the equipment are given. corresponding relationship. The principles underpinning the text of the standard are given in the appendices

GB/T 311.2-2013 Referenced Document

• GB 11032 Metal-oxide surge arresters without gaps for a.c. systems
• GB 311.1-2012 Insulation co-ordination.Part 1:Definitions,principles and rules
• GB/T 16927.1-2011 High-voltage test techniques.Part 1:General definitions and test requirements
• GB/T 26218.1 Selection and dimensioning of high-voltage insulators intended for use in polluted conditions.Part 1:Definitions,information and general principles
• GB/T 28182 Surge arresters containing series gapped structures with rated voltage 52 kV and less
• GB/T 7327 Silicon carbide surge arresters for a.c.systems
• GB/T 772 Technical specifications of porcelain element for high voltage insulators

GB/T 311.2-2013 history

• 2013 GB/T 311.2-2013 Insulation co-ordination.Part 2:Application guide
• 2002 GB/T 311.2-2002 Insulation co-ordination Part 2: Application guide for insulation co-ordination for high voltage transmission and distribution equipment

GB/T 311.2-2013 -All Parts