報告書番号

W96008

タイトル（和文）

直流故障アーク消弧後の絶縁回復特性（その３）－５００ｋＶ直流Ｖ吊，Ｙ吊および直吊懸垂がいし装置の場合－

タイトル（英文）

INSULATION RECOVERY CHARACTERISTICS OF INSULATOR ASSEMBLIES AFTER DC ARC INTERRUPTION (PART 3) -500-KV V-ARRANGED,Y-ARRANGED AND L-ARRANGED SUSPENSION INSULATOR ASSEMBLIES-

概要 （図表や脚注は「報告書全文」に掲載しております）

直流送電において，送電線地絡故障時の再起動を成功させるためには，がいし装置の故障アーク消弧後の絶縁回復特性を知ることが必要である。そこで，５００ｋＶ級の３種（Ｖ吊・Ｙ吊および直吊）の懸垂がいし装置について，アーク電流１００～８０００Ａ，アーク継続時間０．１～０．４秒の範囲で故障アーク消弧後の絶縁回復特性を明らかにし，耐張がいし装置と比較した。その結果，３種のがいし装置の絶縁回復は，いずれも耐張がいし装置に比べてインパルス耐電圧値が２００～３００ｋＶまでは遅く，５００ｋＶ近くでは早くなることが判明した。上記で得られたアーク電流４０００Ａ，アーク継続時間０．１秒における絶縁回復特性をもとに試算した直流５００ｋＶ系統の無電圧時間の最小値は，Ｖ吊，Ｙ吊，直吊懸垂がいし装置の順に小さく（０．１６秒，０．１４秒，０．１４秒）なり，いずれも耐張がいし装置の値（０．１７秒）より小さな値となった。

概要 （英文）

THE INSULATION RECOVERY CHARACTERISTICS OF 500-KV CLASS DC SUSPENSION INSULATOR ASSEMBLIES WERE MEASURED. SWITCHINGSURGE VOLTAGE WAS APPLIED TO THREE KINDS OF ASSEMBLIES (V-,Y- AND I-ARRANGED) FOLLOWING ARC INTERRUPTION. ARC CURRENTS RANGED FROM 100 TO 8000 A AND ARC DURATION RANGED FROM 0.1 TO 0.4 S. (1)ALL THREE TYPES OF SUSPENSION INSULATOR ASSEMBLIES SHOW SLOWER INSULATION RECOVERY AFTER ARCINTERRUPTION THAN THE TENSION INSULATOR ASSEMBLY UP TO AN IMPULSE WITHSTAND VOLTAGE OF 200-300 KV, WITH RECOVERY RATES ACCELERATING AT APPROXIMATELY 500 KV. (2)AT AN ARC CURRENT OF 100 TO 8000 A, FOR A DURATION OF 0.1 S, THE RECOVERY RATE FOR V- AND Y- ARRANGED ASSEMBLIES DECREASES WITH INCREASES IN ARC CURRENT. THIS IS BELIEVED TO BE DUE TO INCREASES IN THE TEMPERATURE OF POST-ARC GAS THAT ACCOMPANY STRONGER ARC CURRENTS. (3)WHEN THE ARC DURATION IS INCREASED FROM 0.1 TO 0.2 S AT AN ARC CURRENT OF 4000 A, THE RECOVERY OF THE V- AND Y-ARRANGED ASSEMBLIES IS DELAYED BY 0.05 S. THIS IS BELIEVED TO BE DUE TO INCREASES IN THE TEMPERATURE OF POST-ARC GAS THAT ACCOMPANY LONGER ARC DURATION. WHEN THE ARC DURATION IS EXTENDED, THE RECOVERY RATE INCREASES AS THE LENGTH OF ARC ROUTES REMAINING IN THE ASSEMBLIES INCREASE. (4)BY MEASURING THE INSULATION RECOVERY CHARACTERISTICS OF THE SUSPENSION INSULATOR ASSEMBLIES WITHAN ARC CURRENT OF 4000 A AND AN ARC DURATION OF 0.1 S, THE MINIMUM VALUE OF THE NON-VOLTAGE TIME FOR A 500-KV DC TRANSMISSION LINE WAS CALCULATED TO BE LESS THAN 0.16 S. THIS VALUE IS SMALLER THAN THAT FOR THE TENSION INSULATOR ASSEMBLY.

報告者

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