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How to choose waterproof cable material

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How to choose waterproof cable material

作者: Release Date: 2017-12-14 Author: Click:

1. For single-core cable, wrap the semi-conductive resistance water tape on the insulation shielding layer, wrap the ordinary water resistance tape outside the metal shielding layer, and then squeeze the outer sheath. The outer sheath material can be ordinary PVC HDPE materials with radial water blocking function can also be used, depending on the requirements of other functions of the cable. Regarding the three-core cable, in order to ensure the full contact of the metal shield, only the single-conductor resistance water tape is wrapped around the insulation shield. The water shield is no longer wrapped around the metal shield. Depending on the requirements of the waterproof function, the filling can be ordinary filling or Water-blocking filling, inner lining and outer sheath materials are the same as described for single-core cables.

Second, the outer sheath or inner lining is longitudinally wrapped with an aluminum-plastic composite tape layer as a waterproof layer.

Third, squeeze the sheath directly outside the cable

For XLPE insulated cables above 110kV, the metal sheath is mainly used to make the cables reach the waterproof requirements. The great feature of the metal sheath is that it is completely impervious, so Nanyang cables with metal sheaths have a very good radial water blocking function. The main types of metal cover are: hot-pressed aluminum sleeve, hot-pressed lead sleeve, welded wrinkled aluminum sleeve, welded wrinkled steel sleeve, cold-drawn metal sleeve, etc.

Cable waterproof method

Cable waterproofing methods are generally divided into two types: longitudinal water resistance and radial diameter water. Water-blocking yarns, water-blocking powders, and water-blocking tapes are commonly used in longitudinal water blocking. Their water-blocking mechanism is that these materials contain a water-swellable material. After entering the defect, this material will rapidly expand in contact with water to prevent the water from further dispersing in the longitudinal direction of the cable, thus completing the purpose of longitudinal waterproofing of the cable. Radial water blocking is mainly accomplished by extruding HDPE non-metallic sheathing or hot pressing, welding, and cold-drawn metal sheathing.

Cable waterproof test basis

In the waterproof test method, assuming that these sheaths are determined to be intact, then the cable is considered to have a good radial water blocking function. However, many users of this method have raised some questions and caused some disputes and lack of convincing power. Therefore, cable manufacturers and users urgently need an experimental method to determine the radial water blocking function of the cable. It can avoid the controversy caused by the radial water blocking function of the cable due to the lack of radial water blocking test methods for manufacturers and users.

Overhead lines

Cable selection criteria

When selecting wires and cables, pay attention to the choice of wire and cable model and specifications (conductor cross section).

⒈Selection of wire and cable models

When selecting wire and cable, you must consider the use, laying conditions and safety; for example, you can choose power cables , overhead insulated cables, control cables, etc. according to different uses; according to different laying conditions, you can choose ordinary plastic insulated cables, steel tape Armored cables, steel wire armored cables, anti-corrosion cables, etc .; according to safety requirements, flame-retardant cables, halogen-free flame-retardant cables, and fire-resistant cables can be selected.

⒉Selection of wire and cable specifications

When determining the application specifications (conductor cross-section) of wires and cables, you should generally consider the selection conditions of heat generation, voltage loss, economic current density, and machine strength.


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Keywords: overhead line

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