750kV extra-high voltage alternating-current filter capacitor device

• Main Authors: TAN ZHENG, WANG HONGPENG, LIU BING, LIANG SHUO, HAO LINLIN, SHI BIN, YUAN BINGLING, CHEN DELING, GE JINPING, LIU CHUNMING, WANG YALING, WANG HUI
• Format: Patent
• Language: English
• Published: 29.04.2015
• Subjects: CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTINGELECTRIC POWER; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRICITY; GENERATION; SYSTEMS FOR STORING ELECTRIC ENERGY

A 750kV extra-high voltage alternating-current filter capacitor device comprises a tubular bus bar, corona rings, capacitors, insulators, racks, an optical current transformer and insulators. A fifteen-layered modular structure formed by stacking capacitors and single-layer racks layer by layer is adopted. Each layer of rack adopts capacitors units which comprise two parallelly-connected capacitors and six serially-connected capacitors. Serially-connected 1/2 potential points of each layer of capacitors are connected with the corresponding rack. Inter-layer insulators adopt 40.5kV-level enhanced supporting insulators. A bottom part of the 750kV extra-high voltage alternating-current filter capacitor device adopts eight 110kV supporting insulators. The 750kV extra-high voltage alternating-current filter capacitor device is characterized in that each rack is additionally provided with the corona rings, insulation leads are adopted among the capacitors, and the relay protection adopts the double-bridge type differential current protection. The 750kV extra-high voltage alternating-current filter capacitor device is applied to a +/-800kV direct current power transmission engineering 750kV alternating current filter field, and is used for filtering 11th-power harmonic waves of a power grid. A single tower structure is adopted, and a total height of the 750kV extra-high voltage alternating-current filter capacitor device is 13.7m. The 750kV extra-high voltage alternating-current filter capacitor device is advantaged by being compact in structure, high in mechanical strength, reasonable in relay protection and insulation cooperation, and small in land occupation area.