ï»?!DOCTYPE HTML> 贵州ç”늼†æ•…障分类及故障查æ‰?- 贵州勇斌ç”늺¿ç”늼†æœ‰é™å…¬å¸
贵州勇斌ç”늺¿ç”늼†æœ‰é™å…¬å¸ä¸ºæ‚¨å…è´¹æä¾›è´µå·žç”늺¿ç”늼†ã€è´µå·žç”µ¾~†åŽ‚家ä­hæ ¹{€è´µå·žç”µ¾~†åŽ‚家等相关信息发布和资讯,敬请å…Ïx³¨åQ?/div>
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贵州ç”늼†æ•…障分类及故障查æ‰?/h1>

来源åQ?span>www.lcetoken.com  è´µå·žç”늼†åŽ‚家  æ›´æ–°æ—‰™—´åQ?021-08-09

一、电¾~†æ•…障的分类和性质判断åQ?/span>

1、低é˜ÀL•…障:ç”늼†ç›”R—´æˆ–相对地故障电阻ž®äºŽ1kΩ的故障称之äؓ低阻故障ã€?/span>

2、高é˜ÀL•…障:相对于低é˜ÀL•…障,当电¾~†ç›¸é—´æˆ–相对地故障电¾~†å€¼å¤§äº?kΩ¿UîC¹‹ä¸ºé«˜é˜ÀL•…障,也对应于高压甉|¡¥æ³•ã€?/span>

3、断¾U¿ä¸Žå¼€è·¯æ•…障:ç”늼†çš„一芯或多芯å¯ég½“或者金属屏蔽层完全断线或似断非断的情况åQŒæˆ‘们称之äؓ开路故障ã€?/span>

4、外护套故障åQšæ ¹æ®å›½å®¶ç”µåŠ›è¡Œä¸šæ ‡å‡†DL586-1996《电力设备预防性试验规½E‹ã€‹ï¼Œ66k-500kVç”늼†èšæ°¯ä¹™çƒ¯(PVC)和高密度聚乙çƒ?HDPE)外护套对地绝¾~˜ç”µé˜Õd°äº?00兆欧姆或5kV直流耐压试验不能通过的缺é™ähˆ–æ•…éšœã€?/span>

二、判断电¾~†æ•…障性质åQ?/span>

(1)需要万用表和摇è¡?高阻è®?各一只,ä¸ÞZ¿è¯è¯»æ•°çš„½E›_®šå’Œå‡†¼‹®ï¼Œå¥½æ˜¯æŒ‡é’ˆå¼è¡¨è®?

(2)¾lç¼˜ç”µé˜»‹¹‹é‡åQŒç”¨æ‘‡è¡¨ã€ä¸‡ç”¨è¡¨åˆ†åˆ«‹¹‹é‡¾U¿èŠ¯å¯¹åœ°¾lç¼˜ç”µé˜»å’Œç›¸é—´ç»¾~˜ç”µé˜?

(3)å¯ég½“¾U¿èŠ¯˜qžç®‹æ€§åˆ¤æ–­ï¼Œåœ¨ç”µ¾~†è¿œç«¯å°†ä¸‰ç›¸çŸ­èµ\åQŒåœ¨˜q‘端用万用表‹¹‹é‡ç›”R—´å¯ég½“电阻ã€?/span>

(4)如果å¯ég½“¾U¿èŠ¯˜qžç®‹æ€§è¯•éªŒè¯»æ•îCؓ无穷大,则äؓ断线与开路故障。如果绝¾~˜ç”µé˜»è½åœ¨ä½Žé˜Õd’Œé«˜é˜»æ•…障范围åQŒåˆ™åˆ¤å®šä¸ÞZ½Žé˜ÀLˆ–高阻故障。如果对66k-500kV­‘…高压电¾~†å¤–护套‹¹‹é‡åQŒç»¾~˜ç”µé˜Õd°äº?00兆欧姆或5kV直流耐压试验不能通过åQŒåˆ™ä¸ºå¤–护套故障ã€?/span>


三、准¼‹®å®šç‚?/span>

1、声¼‚åŒæ­¥æ³•å†²å‡»å‘生器在ç”늼†æ•…障点处引è“v闪络后会产生¼‚åœºå’Œå¼ºçƒˆå¯‹¹‹å¬çš„é—ª¾lœå£°éŸŸë€‚由于声¼‚ä¼ æ’­é€Ÿåº¦ä¸åŒåQŒå£°¼‚åŒæ­¥å®šç‚¹äÈA探头可先后拾取该¼‚åœºå’Œå£°åœºï¼Œä¸”接收器昄¡¤ºå±å¯è‡ªåŠ¨æ˜„¡¤ºè¯¥æ—¶é—´å·®åQŒå½“探头位于故障点的正上æ–ÒŽ—¶åQŒè·¼›ÀL•…障点˜q‘,因而时间差也小åQŒæ­¤å¤„即为故障点的准¼‹®ä½¾|®ã€?/span>

2、跨步电压法由高压发生器与定点äÈA共同¾l„合使用åQŒé€šè¿‡ä¸¤æ ¹æŽ¥åœ°é“é’ŽåQŒå¯»æ‰‘ÖœŸå£¤ä¸­ç”µåŠ¿ä½Žç‚¹è€Œå‡†¼‹®å®šç‚V€‚在故障点处‹¹å…¥å¤§åœ°çš„测试电‹¹å¯¼è‡´æ•…障点处äؓ正负电压峰å€ÆD{换点åQŒåœ¨æ•…障点前接近故障æ—Óž¼Œè·¨æ­¥ç”µåŽ‹å¢žåŠ åQŒè¶Š˜q‡æ•…障后跨步电压减小åQŒåƈ且极性改变。在接地故障ç‚ÒŽ­£ä¸Šæ–¹æ—Óž¼Œå®šç‚¹ä»ªæŒ‡é’ˆåœåœ¨é›¶ä½ï¼Œæ­¤å¤„即äؓç”늼†æ•…障点的准确位置ã€?/span>

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