GB/T 311.14-2024
Insulation Coordination Part 14: Insulation Coordination of AC/DC Filters for High Voltage DC Systems (English Version)

Standard No.
GB/T 311.14-2024
Language
Chinese, Available in English version
Release Date
2024
Published By
General Administration of Quality Supervision, Inspection and Quarantine of the People‘s Republic of China
Latest
GB/T 311.14-2024
 
Introduction

Interpretation of the core content of the standard

As the 14th part of the GB/T 311 series, this standard specifically puts forward technical requirements for the insulation coordination of AC filters (including shunt capacitors) and DC filters in high-voltage DC transmission systems, and focuses on standardizing:

  • Typical configuration schemes and operating characteristics of filters
  • Lightning arrester protection strategy and stress calculation method
  • Insulation coordination design procedure and safety factor selection
  • Typical equivalent operating condition modeling method

Key technical points

1. Filter configuration scheme

Filter typeTypical structureApplicable scenarios
AC filter Triple-tuned/double-tuned/single-tuned/C-type damping/shunt capacitor Required for LCC converter station, optional for MMC converter station
DC filter Triple-tuned/double-tuned filter Configuration selected according to system harmonic characteristics

2. Insulation coordination core parameters

The standard clearly requires the calculation of the following key parameters:

  • Continuous operating voltage (CCOV): Harmonic superposition voltage is calculated using the 2% statistical method or arithmetic sum method
  • Representative overvoltage (Urp): Determined through simulation of typical fault conditions
  • Safety factor (Ks): 1.25 (lightning)/1.15 (operation) for AC filters and 1.20/1.15 for DC filters

Analysis of implementation points

Principles of lightning arrester configuration

The lightning arrester arrangement scheme recommended by the standard follows:

  1. High-voltage capacitors are not equipped with direct protection lightning arresters
  2. Low-voltage reactors and resistors are equipped with parallel lightning arresters
  3. Triple-tuned/double-tuned filters can choose node-to-node or ground protection mode

Typical fault protection cases

Case 1: 500kV AC filter
Double-tuned filter in the case of single-phase grounding fault:
- Fac1 arrester withstands 238.1kV fast wave front overvoltage
- LIWV is finally determined to be 325kV (safety factor 1.25)

Case 2: ±800kV DC filter
Three-tuned filter in the event of a pole line grounding fault:
- Fdc1 arrester absorbs energy of 1124.1kJ
- SIWV of points 1-2 is determined to be 1925kV

Engineering application recommendations

  • Preferably use the 2% statistical method to calculate CCOV to optimize equipment size
  • The necessity of filter configuration needs to be evaluated separately for flexible DC systems
  • Pay special attention to the low-order harmonic stress when the converter transformer is put into operation without load
  • It is recommended to establish a complete arrester configuration summary table (standard table 6-7)

GB/T 311.14-2024 Referenced Document

  • GB/T 25093 AC filters for HVDC systems
  • GB/T 25308 DC filters for high voltage direct current (HVDC) transmission system
  • GB/T 311.1-2012 Insulation co-ordination.Part 1:Definitions,principles and rules
  • IEC 60071-12:2022 Insulation co-ordination - Part 12: Application guidelines for LCC HVDC converter stations

GB/T 311.14-2024 history

  • 2024 GB/T 311.14-2024 Insulation Coordination Part 14: Insulation Coordination of AC/DC Filters for High Voltage DC Systems
Insulation Coordination Part 14: Insulation Coordination of AC/DC Filters for High Voltage DC Systems

Topics on standards and specifications

Insulation coordination of high voltage power transmission and transformation parts

Standard and Specification

VDE 0110-2-1989*DIN VDE 0110-2:1989 Insulation coordination for equipment within low-voltage systems VDE 0110-1-1989*DIN VDE 0110-1:1989 Insulation co-ordination for equipment within low-voltage systems; Fundamental requirements VDE 0110-3 A1 E*DIN EN 60664-3 A1:2009-05 Insulation coordination for equipment within low-voltage systems – Part 3: Use of coating, potting or moulding for protection against pollution VDE 0111-1 E*DIN EN IEC 60071-1:2021-03 Insulation coordination - Part 1: Definitions, principles and rules (IEC 60071-1:2019 KS C IEC 60664-1:2009 Insulation coordination for equipment within low-voltage systems-Part 1:Principles, requirements and tests BS EN IEC 60204-11:2019 Safety of machinery. Electrical equipment of machines. Requirements for equipment for voltages above 1 000 V AC or 1 500 V DC and not exceeding 36 kV ANSI/IEEE 1427:2006 Guide for Recommended Electrical Clearances and Insulation Levels in Air Insulated Electrical Power Substations IEEE 1427-2006 Guide for Recommended Electrical Clearances and Insulation Levels in Air-Insulated Electrical Power Substations IEC 62896:2024 Hybrid insulators for AC and DC for high-voltage applications greater than 1 000 V AC and 1 500 V DC - Definitions, test methods and acceptance criteria VDE 0111-11 E*DIN EN IEC 60071-11:2021-07 Insulation co-ordination for HVDC system Part 11: Definitions, principles and rules

GB/T 311.14-2024 -All Parts

GB/T 311.1-2012 Insulation co-ordination.Part 1:Definitions,principles and rules GB/T 311.14-2024 Insulation Coordination Part 14: Insulation Coordination of AC/DC Filters for High Voltage DC Systems GB/T 311.2-2013 Insulation co-ordination.Part 2:Application guide GB/T 311.3-2017 Insulation co-ordination—Part 3: Procedures for high-voltage direct current (HVDC) converter stations GB/T 311.4-2010 Insulation co-ordination.Part 4:Computational guide to insulation co-ordination and modeling of electrical networks GB/T 311.6-2005 Voltage measurement by means of standard air gaps


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