報告書番号

684004

タイトル（和文）

高速自動接地方式による二次アークの強制消弧（その１）

タイトル（英文）

FORCED EXTINCTION OF SECONDARY ARC BY SIMULATED HIGH-SPEED GROUNDING SWITCHES (1)

概要 （図表や脚注は「報告書全文」に掲載しております）

ＵＨＶ送電線二次アークを強制消弧させる方式として，高速自動接地方式について実験検討した。対象線路条件として，ＵＨＶ送電非撚架２回線（約１６０ｋｍ）下相の１線地絡，地絡相開放とした。１．１～２．５ｍ／ｓ程度の微風であっても，両端の接地装置を投入すれば，消弧時間は約１０ｍｓ以内であり，二次アークは瞬時に消弧できるといえる。２．電磁誘導電流に直流分が含有されると，消弧時間は延びるが，ＵＨＶ系統では，アーク抵抗が大きいため，影響は少ない。３．２台の接地装置の投入時間差が少ない方が消弧時間は短い。４．電磁誘導電流が３００Ａ程度と小さい場合には，片端の接地装置のみで二次アークを消弧できる可能性がある。

概要 （英文）

SUCCESSFUL HIGH-SPEED RECLOSING IS NECESSARYFOR A STABLE POWER SUPPLY. BECAUSE OF HIGH VOLTAGE AND LONG DISTANCE OF UHV TRANSMISSION LINES, AUTO-EXTINCTION OF SECONDARY ARC IS USED TO BE DIFFICULT WITHIN 2 SECONDS. THEREFORE IT IS NECESSARY FOR HIGH-SPEED RECLOSING TO EXTINGUISH ARTIFICIALLY SECONDARY ARC IN A SHORT TIME. THIS PAPER DESCRIBES EXPERIMENTAL RESULTS OF FORCED EXTINCTION OF SECONDARY ARC BY SIMULATED HIGH-SPEED GROUNDING SWITCHES FOR UHV TRANSMISSION LINES. THE MAIN RESULTS ARE AS FOLLOWS: (1)IN CASE THAT THE GROUNDING SWITCHES AT EACH END OF THE LINE WERE CLOSED, THE SECONDARY ARC WAS EXTINGUISHED RAPIDLY WITHIN ABOUT 10MS. (2)WHEN THE GROUNDING SWITCHES ARE CLOSED,THE ELECTROMAGNETICALLY INDUCED CURRENT BY ENERGIZED PHASE MAY INCLUDE TRANSIENT D.C.COMPONENT. BUT,IN A LONG GAP SUCH AS 6M,THE ARC RESISTANCE BETWEEN THE GAP IS SO HIGH THAT THIS D. C.COMPONENT DECAYS RAPIDLY AND THE SECONDARY ARC IS ALSO EXTINGUISHED. (3)IN CASE THAT DIFFERENCE OF CLOSING TIME OF BOTH GROUNDING SWITCHES IS SMALLER,THE SECONDARYARC IS EXTINGUISHED MORE RAPIDLY WITHIN 3MS. (4)WHEN THE ELECTROMAGNETICALLY INDUCED CURRENT IS SMALL,THERE IS CHANCE OF EXTINGUISHING THE SECONDARY ARC USING ONLY ONE GROUNDING SWITCH. (5)VOLTAGE-CURRENT CHARACTERISTICS OF THE ARC ACROSS A 6M GAP SHOW HYSTERSIS LOOPS OF HIGH CURRENT WITH LOW VOLTAGE AT PRIMARY ARC AND OF SMALL CURRENT WITH HIGH VOLTAGE AT SECONDARY ARC.

報告者

キーワード