What is a waterproof cable? Waterproof cable is a cable that can effectively prevent water from penetrating inside the cable structure, referred to as JHS, and uses materials with waterproof properties to manufacture the cable outer sheath, ultimately achieving the effect of waterproof cable.
ⅠThe meaning of waterproof cable
By nature, waterproof cable is a kind of flexible cable, generally used as a connection line for pump power supply, is a kind of rubber-sheathed cable, often need to move. In Guangdong, heavy rainfall is frequent in summer and autumn, and urban flooding is serious, many of the power machinery to cope with this situation need to use JHS waterproof cable. In fact, in the summer and autumn months, when urban flooding is frequent, JHS waterproof cables ensure our normal modern life in a way that is difficult to understand.
Cables that can be used properly in water are collectively known as water-blocking power cables. When the cable is laid underwater, often submerged in water or wet places, the cable is required to have a waterproof function, that is, the requirement to have a full water-blocking function, in order to prevent moisture from dipping into the cable, causing damage to the affected cable, to ensure that the affected cable in long-term stable operation underwater. The difference between waterproof cables and ordinary cables is that ordinary cables cannot be used in water.
Ⅱ the waterproof cable different two waterproof way
Obviously, waterproof cable is generally used for more humid or directly underwater work environment, according to the different ways of waterproofing, we can be waterproof cable into active waterproof and passive waterproof two. Active waterproofing: using the physical properties of the cable waterproofing material to absorb water and swell, when the sheath is broken, the cable waterproofing material will absorb water and swell, preventing further water penetration into the cable body, limiting the impact of water ingress to a minimum. Passive waterproofing: the use of cable waterproofing materials with hydrophobic properties, in the protective layer breakage point will be directly water (gas) block away, so that it can not enter the cable body, this type of cable waterproofing materials mainly include hot melt adhesive, oil-filled paste, thermal expansion of the oil paste.
Ⅲ waterproof cables are mainly the following three categories
1. oil paper insulated cable is the most typical water-resistant cable
Its insulation and conductors are filled with cable oil, insulation outside the metal sheath (lead jacket or aluminum jacket), is the best water-resistant cable. In the past, the submarine (or underwater) cable mostly used oil paper insulated cable, but the oil paper insulated cable is restricted by the drop, there is oil leakage trouble, maintenance inconvenience, now use less and less.
2. widely used in low-voltage underwater transmission lines of ethylene propylene rubber insulated cable
Is due to its superior insulation performance without the "water tree" of worry. Rubber coated waterproof cable can operate safely in shallow water for a long time.
3. cross-linked polyethylene (XLPE) insulated power cables
Due to its excellent electrical, mechanical and physical properties, and the production process is simple, light structure, large transmission capacity, easy installation and maintenance, not subject to drop restrictions and other advantages, become the most widely used insulation materials, but it is particularly sensitive to moisture, in the manufacturing and operation process if the insulation has water immersion, prone to "water tree" breakdown, greatly shortening the service life of the cable. Therefore, cross-linked polyethylene insulated cables, especially medium and high voltage cables under AC voltage, must have a "water barrier structure" when used in a watery or humid environment. The so-called "water-blocking structure" includes both radial and longitudinal water-blocking structures.