Causes of cable bridge cable aging

跟著電纜橋架的廣泛應(yīng)用，在運用的呈現(xiàn)的毛病也層出不強，比方線纜老化現(xiàn)象，線纜主要靠外面一層包皮絕緣，假如保護欠好，其絕緣功能就會逐步下降，漸漸老化變硬發(fā)脆或掉落，然后起不到絕緣的效果。那么是什么原因?qū)е码娎|橋架線纜老化呢？接下來，就帶大家了解一下。

With the widespread application of cable bridge, there are many defects in operation, such as cable aging phenomenon, cable mainly rely on an outer layer of insulation, if the protection is not good, its insulation function will gradually decline, gradually aging, hardening, brittle or falling, and then no insulation effect. So what causes cable bridge cable aging? Next, let us know about it.

1.化工原料的腐蝕。

1. corrosion of chemical raw materials.

電纜直接埋在有酸堿效果的區(qū)域，往往會構(gòu)成電纜的鎧裝鉛皮或外護層被腐蝕，保護層因長時間遭受化學(xué)腐蝕或電解腐蝕，致使保護層失效，絕緣下降，然后導(dǎo)致線纜老化。

Cables buried directly in the acid-base effect of the area, often constitute the cable armoured lead skin or outer protective layer is corroded, protective layer due to long-term chemical corrosion or electrolytic corrosion, resulting in the failure of protective layer, insulation decline, and then lead to cable aging.

2.長時間過負荷運行。

2. long time overload operation.

因為電流的熱效應(yīng)，負載電流經(jīng)過電纜時必定導(dǎo)致導(dǎo)體發(fā)熱，一起電荷的集膚效應(yīng)以及鋼鎧的渦流損耗絕緣介質(zhì)損耗也會產(chǎn)乍附加熱量，然后使電纜橋架的電纜溫度升高。長時間超負荷運行時，過高的溫度會加快絕緣的老化，以致絕緣被擊穿。尤其在炎熱的夏日，電纜的溫升常常導(dǎo)致電纜絕緣單薄處被擊穿，因此在夏日，電纜的毛病也就特別多。

Because of the thermal effect of current, the load current must cause the conductor to heat when it passes through the cable. The skin effect of electric charge and the eddy current loss of steel armor will produce additional heat at first, then the cable temperature of the cable bridge will rise. Over a long period of operation, excessive temperature will accelerate the aging of insulation, resulting in insulation breakdown. Especially in the hot summer, the temperature rise of the cable often causes the thin insulation of the cable to be first broken down, so in the summer, cable problems are particularly numerous.

3.電纜接頭毛病。

3. cable connection fault.

電纜接頭是電纜線路中比較單薄的環(huán)節(jié)，由人員直接過錯引發(fā)的電纜接頭毛病經(jīng)常發(fā)作，所以，施工人員在制造電纜接頭過程中，假如有接頭壓接不緊加熱不充分等原網(wǎng)，都會導(dǎo)致電纜頭絕緣下降，呈現(xiàn)線纜老化現(xiàn)象。

Cable joint is a thin link in the cable line. Cable joint faults caused by direct faults often occur. Therefore, in the process of making cable joints, if the joints are not pressed tightly and heated insufficiently, the original network will lead to cable head insulation decline, showing cable aging phenomenon.

4.絕緣受潮狀況。

4. insulation damp condition.

一般這樣的狀況相對比較常見，一般發(fā)作在直埋或排管里的電纜接頭處。比方電纜橋架的接頭制造不合格和在潮濕的氣候條件下做接頭，會使接頭進水或混入水蒸氣，在電場效果下構(gòu)成水樹枝，逐步損害電纜的絕緣強度而構(gòu)成毛病。

Generally, this situation is relatively common, and usually occurs in the cable joints where burying or draining pipes are located. For example, if the joints of cable bridges are fabricated unqualified and made in damp climates, the joints will enter water or mix with water vapor, forming water branches under the effect of electric field, gradually damaging the insulation strength of the cable and causing problems.

電纜橋架以及線纜周邊的外界環(huán)境和熱源也會構(gòu)成電纜溫度過高絕緣擊穿，呈現(xiàn)線纜老化現(xiàn)象，嚴峻的話，還會構(gòu)成爆破起火。

External environment and heat source around cable bridge and cable will also cause insulation breakdown of cable temperature too high, showing cable aging phenomenon, if severe, it will also constitute a blasting fire.

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