What is the content of periodic test for high voltage cable?

“Power cable operation regulation” stipulates that under the condition of not losing normal oil pressure, it is not necessary to conduct DC withstand voltage test regularly for high voltage oil filled AAAC Cable. As long as the oil pressure is normal and the dielectric loss and breakdown strength of oil are qualified, it can be … Read more

Differences in use of brass, phosphor copper and red copper

Pure copper is a purplish red metal, commonly known as “red copper”, “red copper” or “red copper”. Pure copper is ductile. Pure copper, the size of a drop of ACSR Cable, can be drawn into two kilometers of filaments or rolled into almost transparent foil larger than a bed. The most valuable property of pure … Read more

How to prevent and control pests on cable lines?

For direct buried ACSR Cable laying, in addition to preventing external mechanical damage, there is another kind of external damage from insects, such as termites. South China is located in the subtropical zone with humid climate, which is suitable for termite breeding. Termites will damage the lead sheath of the cable, causing the insulation damp … Read more

Difference between low voltage cable and medium voltage cable

There are many kinds of AAAC Cables. According to voltage, they can be divided into low-voltage cable, medium voltage cable and high-voltage cable. What we can often touch and use in our life are low-voltage cable and medium voltage cable. How can we distinguish them? Some people say it’s 1kV, others say it’s 10kV. How … Read more

What is the valve performance of the sheath protector?

In order to ensure that the sheath insulation will not be damaged under the action of lightning overvoltage and switching overvoltage, the sheath protector should be used. The ball gap protector was used in the early stage, but its disadvantage was that its surface was burnt by power frequency afterflow after each action. This type … Read more

Operation and maintenance of protective layer protector

In order to reduce the induced overvoltage of the metal sheath of single core AAAC Cable lines of 110kV and above, a protective layer protector should be installed between the ungrounded end of the metal sheath and the earth. In case of system trip or line lightning stroke, special patrol shall be conducted for cable … Read more

What is the national standard cable

National standard ACSR Cable, literally, is the wire and cable produced in strict accordance with national standards. China has clear regulations on the appearance, mechanical strength, insulation of sheath, withstand voltage strength and line resistance of cables. There are different national standards for different types of cables, mainly as follows: ·Executive standard for irradiation crosslinked … Read more

Testing of sheath and corrosion protection

The intact cable sheath can effectively protect the insulation: it can prevent liquid water from immersing in the insulation, and the enclosed metal sheath can also prevent moisture from diffusing into the insulation, so it can obviously prevent the formation of water branches in PE / XLPE insulated cables. The sheath and anti-corrosion layer test … Read more