GB/T 311.11-2025 Insulation co-ordination—Part 11:Definitions,principles and rules for HVDC system

Scope

This document specifies the principles of insulation coordination for line-commutated converters (LCC) and voltage-source converters (VSC) in high-voltage direct current (HVDC) systems. It applies to HVDC systems with a nominal voltage of more than 1.5 kV, and its main principles also apply to converters with other special structures of LCC, such as capacitor-commutated converters (CCC) and controllable series compensation converters (CSCC). This document stipulates the principles of procedures for determining the specified withstand voltage, creepage distance, and minimum air gap distance of equipment and devices in the system; and provides typical DC voltages, specified withstand voltages, and corresponding minimum air gap distances. This document applies to the insulation coordination of equipment connecting the AC bus (including AC harmonic filters, converter transformers, and circuit breakers) of converter stations and the DC line side. The influence of lines and cables on the insulation coordination of converter station equipment is also included. This document is only applicable to high-voltage direct current systems in power systems and is not applicable to industrial converter equipment. The principles and rules given are only for the purpose of insulation coordination. This document does not address requirements for personal safety.

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