Capacitor device category-SUN.KING TECHNOLOGY GROUP LIMITED

Home > Product Center > Power Capacitor > Capacitor device category > Capacitor Banks in HVDC Project

Capacitor device category

Capacitor Banks in HVDC Project

The basic working principle of the high-voltage direct current transmission system is to convert alternating current into direct current through a converter, transmit the direct current to the receiving end converter, and then the converter converts the direct current into alternating current and transmits it to the receiving end AC system. High-voltage direct current transmission technology is mainly used in large-capacity and long-distance power transmission projects.

Product Features

GB/T 20993-2012　 "DC filter capacitor and neutral bus impulse capacitor for high-voltage DC transmission systems"
GB/T 20994-2007 "Shunt capacitor and AC filter capacitor for high-voltage DC transmission systems"
GB/T 16927.1-2011 "High voltage test technology Part 1: General definitions and test requirements"
GB 50260-2013 "Code for seismic design of power facilities"
GB 311.1-2012 "Insulation coordination of high-voltage transmission and transformation equipment"
GB/T 26218.1-2010 "Selection and size determination of high-voltage insulators for use under polluted conditions Part 1: Definitions, information and general principles"
IEC 60871-1:2005 "Shunt capacitor for a.c. power systems having a rated voltage above 1000V—Part 1: General"
IEC 60871-2:2005 "Shunt capacitor for a.c. power systems having a rated voltage above 1000V—Part 2: Endurance testing"
IEC 60871-3:2005《Shunt capacitor for a.c. power systems having a rated voltage above 1000V—Part 3: Protection of shunt capacitor and shunt capacitor banks》
IEC 60871-4:2005 《Shunt capacitor for a.c. power systems having a rated voltage above 1000V—Part 4: internal fuses》

Main structure and parameters of capacitor bank

The structural form of the capacitor bank depends on the number of capacitor, the insulation requirements of the device, the installation size, the height of the device and other factors. In the design of the capacitor bank, at least the following factors should be considered:
Mechanical load during operation, installation and maintenance;
Electromotive force of the capacitor bank caused by external or internal faults;
Wind load;
Seismic requirements;
The influence of expansion and contraction caused by temperature and load changes.

Insulation design

The insulation structure of the capacitor bank can be mainly divided into: interlayer insulation, ground insulation and phase insulation.

Mechanical strength of capacitor bank

The mechanical strength of capacitor bank is mainly affected by the following factors:
The bending and compressive strength of the support insulator;
The arrangement and connection method of the support insulator;
The structure and weight of the steel frame, the type, grade and quality of the steel, and the quality of the fasteners;
The overall structure of the tower;
The intensity of earthquakes and wind speeds;
The stress conditions during installation and maintenance;
The safety factor required by the device.
Using special simulation software, the mechanical strength of the capacitor bank under the influence of the above factors can be calculated and verified, so that a safe, reliable, economical and reasonable design scheme can be selected.