報告書番号

180053

タイトル（和文）

５００ｋＶガス絶縁変電所の雷サージ絶縁協調と酸化亜鉛形避雷器の適用による絶縁低減効果

タイトル（英文）

LIGHTNING SURGE INSULATION COORDINATION AND REDUCTION OF THE INSULATION LEVEL BY APPLYING ZINC-OXIDE TYPE LIGHTNINGARRESTERS FOR THE 500KV GAS INSULATED SUBSTATION

概要 （図表や脚注は「報告書全文」に掲載しております）

５００ｋＶフルＧＩＳモデル変電所を対象に，ケーブルシース回路も考慮して当所の過渡現象解析プログラムにより雷サージ絶縁協調を検討するとともに，酸化亜鉛形避雷器の積極的活用による絶縁低減効果について検討した。その結果，線路引込口に避雷器の適正配置により，ガス絶縁開閉機器，引込口機器の絶縁レベルの低減が可能であること，ケーブルシースの接地場所を変圧器側とし，シース用避雷器をＧＩＳ側に設置することが望ましいこと，ケーブル・変圧器保護用避雷器をケーブルの変圧器側に設置することが望ましいこと，高性能避雷器の適用により絶縁レベルの低減が可能であることなどが明らかとなった。

概要 （英文）

LIGHTNING SURGE INSULATION COORDINATION WAS ANALYSED FOR THE 500KV MODEL GAS INSULATED SUBSTATION BY TRANSIENT ANALYSIS PROGRAM(DTAP),CONSIDERING WITH THE EFFECTS OF CABLE SHEATH CIRCUITS. AT THE SAME TIME,EFFECTS WITH ZINC-OXIDE TYPE LIGHTNING ARRESTERS(ZNO ARRESTERS)TO REDUCE THE INSULATION LEVEL OF THE APPARATUS IN SUBSTATION WERE STUDIED. MAIN RESULTS OBTAINED ARE AS FOLLOWS. 1)ARRANGING THE ZNO ARRESTERS PROPERLY NEAR THE TERMINALS OF THE OVERHEAD LINES,IT BECOMES POSSIBLE TO REDUCE THE IN SULATION LEVEL OF THE GAS INSULATED APPARATUS FROM BIL VALUE OF 500H(1800KV) TO 500L(1550KV). 2)IN THE CASE OF ARRANGING THE EXISTING ZNO ARRESTERS AT THE GAS INSULATED SIDES OF THE CABLES TO PROTECT CABLES AND TRANSFORMERS,LIGHTNING SURGE VOLTAGES AT THE TRANSFORMERS EXCEED BIL VALUE. ON THE OTHER HAND,WHEN THE ARRESTERS ARE ARRANGED AT THE TERMINALS OF TRANSFORMERS,IT IS POSSIBLE TO CO-ORDINATE THE INSULATION LEVEL OF ALL APPARUTUS IN SUBSTATION. 3)FROM THE LIGHTNING SURGE VOLTAGES DISTRIBUTION POINT OF VIEW,IT IS DESIRABLE TO EARTH THE CABLE SHEATHS AT THE TRANSFORMER SIDES AND ARRANGE THE SHEATH ARRESTERS AT THE GAS INSULATED SIDES. 4)APPLYING SIC TYPE ARRESTERS(WITH GAP),MAXIMUM LIGHTNING SURGE VOLTAGE BECOMES ABOUT 200KV HIGHER THAN THAT WITH ZNO ARRESTERS. THEREFORE,WITH SIC ARRESTERS,IT IS NECESSARY TO CONSIDER THE BIL VOLUE OF 500H (1800KV)FOR GAS INSULATED BUS. 5)LIGHTNING SURGE VOLTAGES WERE STUDIED WITH VARIOUS VOLTAGE SURPRESSION CHARACTERISTICS OF ZNO ARRESTERS NOT ONLY EXISTING NOW BUT ALSO BEING DEVELOPED IN FUTURE. AS A RESULT,WITH ZNO ARRESTERS WHICH WILL BE DEVELOPED IN FUTURE(FOR UHV POWER TRANSMISSION),IT IS POSSIBLE TO REDUCE THE BIL VALUES FOR 500KV GIS TO 1425KV.

報告者

キーワード