High voltage cable mold the causes of common problems
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High voltage cable mold the causes of common problems
 

High voltage cable mold the causes of common problems

Cable is the bridge between power supply equipment and electrical equipment, power transmission effect. Widely used, and thus are often attack, briefly analyze the YJV below high voltage cable factors for common questions, classified according to the factors of fault attack roughly divided into the following categories: factory production, construction quality, planning unit planning factors, external force damage four categories.


Cable is the bridge between power supply equipment and electrical equipment, power transmission effect. Widely used, and thus are often attack, briefly analyze the YJV below high voltage cable factors for common questions, classified according to the factors of fault attack roughly divided into the following categories: factory production, construction quality, planning unit planning factors, external force damage four categories.

A, factory production factors

Factory production factors based on the attack site, ontology is divided into cable, cable connectors, cable grounding system factors.

1, cable production factors of ontology

Usually presented in a simple questions in the process of produce cable insulation eccentricity, insulation shielding thickness is not uniform, insulation, impurities, inner and outer shield has swelled, uneven crosslinking degree of be affected with damp be affected with damp, cable, cable metal sheath seal bad, such as some serious condition could be completed or shortly after the operation of present problems in the experiments, there also exists some faults way on a cable system, and cause serious danger to the cable run safely for a long time.

2, cable joint production factors


Type high voltage cable joint has wrapped around, die casting, molding, such as type, the scene to make the work demand, and because the site conditions of the constraints, and making technical factors, insulating tape will inevitably have gap between layers and impurities, so simple question. Throughout the domestic type of choice is assembled and prepared.


正版2019年生肖四不像 Cable joint is divided into cable terminal connector and cable intermediate joint, no matter what method of joint, cable joint problems are often present in cable insulation shielding fracture place, because here is converged on the part of the electrical stress, because of production factors have led cable joint stress cone body production factors have shortcomings, insulation fillers doubt, seal oil and other factors.

3, cable grounding system


Cable grounding system includes cable box, cable grounding protection box (with sheath protector), cable with interconnected box, such as covering protector for some. Questions usually simple attack on the bad sealing water causes first because body point grounding, metal shield layer caused by induced current is too large. Other covering protector for parameter selection is not reasonable or bad quality of zno crystals is not stable and simple sheath protector damage.

Second, the construction quality

Because the construction quality in high voltage cable system in the case of a lot of trouble, the primary factor has the following several aspects:

1, the condition on site is poor, cable and connectors in factory production environment and the technology request is very high, and the construction site is bad control temperature, humidity, dust.


2, cable construction process in exterior insulation will inevitably leave minor scratches, semi conductive particles and emery cloth sand on May also be embedded in the insulation and other joint because the insulation is exposed to the air in the construction process, and also are drawn into the moisture in the insulation, all these leave risk to the safety operation for a long time.

3, when the device without strict according to construction technology or technical rules without considering the questions may be present.

4, selection of tests on completion within the dc withstand voltage test joint constitute the electric insulation damage.

5, because of improper sealing treatment. The middle joint is necessary to choose copper shell with PE or PVC insulation coating sealing structure, in site construction to ensure the seal is close-grained, so useful to ensure the sealing of joint waterproof function.

正版2019年生肖四不像Three factors, planning

Cable swell caused heated cable crowded injury caused the breakdown. Crosslinking cable load is high, the wire core temperature increase, the cable is heated swell, at the top of the tunnel in turning on the cable on the bracket elevation, big load power cable operation activities for a long time is very big, the bracket elevation crushed cable outer sheath, metallic sheath, into cable insulation cable breakdown.


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