Basic knowledge of high voltage cable

High voltage cable is a kind of power cable, which is used to transmit power cable between 10kV and 35kV (1kV = 1000V). It is mainly used in the main road of power transmission.

The main types of high voltage cables are YJV cable, VV cable, yjlv cable and VLV cable.

YJV cable full name: XLPE insulated PVC sheathed power cable (copper core)

Full name of VV cable PVC insulated PVC sheathed power cable (copper core)

Yjlv cable full name: XLPE insulated PVC sheathed aluminum core power cable

VLV cable is PVC insulated PVC sheathed aluminum core power cable

Due to the excellent conductivity of copper conductor, more and more projects use copper core power cable as the main road of power supply system, while the application of aluminum core power cable is less, especially in the higher voltage power system, the more copper core cable is selected.

Structure of high voltage cable

The components of high voltage cable from inside to outside include: conductor, insulation, inner protective layer, filler (armor) and outer insulation. Of course, the armored high-voltage cable is mainly used for ground burial, which can resist the high-strength compression on the ground and prevent other external force damage.

Na-yjv, nb-yjv, XLPE insulated PVC sheathed class A (b) fire-resistant power cables can be laid in indoor, tunnel and pipeline with fire resistance requirements.

Na-yjv22, nb-yjv22, XLPE insulated steel strip armored PVC sheathed class A (b) fire-resistant power cables are suitable for buried laying when fire resistance is required, but not suitable for laying in pipelines.

Na-vv, nb-vv, PVC insulated and PVC sheathed class A (b) fire-resistant power cables can be laid in indoor, tunnel and pipeline with fire resistance requirements.

Na-vv22, nb-vv22, PVC insulated steel strip armored PVC sheathed class A (b) fire-resistant power cables are suitable for buried laying when fire resistance is required, but not suitable for laying in pipelines.

Wdna-yjy23, wdnb-yjy23, XLPE insulated steel strip armored polyolefin sheathed a (b) class halogen-free low smoke fire-resistant power cables are suitable for laying underground when there are requirements for halogen-free low smoke and fire resistance, but not suitable for laying in pipelines.

Za-yjv, za-yjlv, zb-yjv, zb-yjlv, zc-yjv, zc-yjlv, XLPE insulated PVC sheathed class A (B, c) flame-retardant power cables can be laid in indoor, tunnel and pipeline with flame retardant requirements.

Za-yjv22, za-yjlv22, zb-yjv22, zb-yjlv22, zc-yjv22, zc-yjlv22, XLPE insulated steel strip armored PVC sheathed class A (B, c) flame-retardant power cables are suitable for buried laying when flame retardant requirements are required, not suitable for laying in pipelines. Za-vv, za-vlv, zb-vv, zb-vlv, zc-vv, zc-vlv, PVC insulated and PVC sheathed class A (B, c) flame-retardant power cables can be laid in indoor, tunnel and pipeline with requirements for flame retardant.

Za-vv22, za-vlv22, zb-vv22, zb-vlv22, zc-vv22, zc-vlv22, PVC insulated steel strip armored PVC sheathed class A (B, c) flame retardant power cables are suitable for buried laying when flame retardant requirements are required, not suitable for laying in pipelines. Wdza-yjy, wdza-yjly, wdzb-yjy, wdzb-yjly, wdzc-yjy, wdzc-yjly, XLPE insulated polyolefin sheathed class A (B, c) flame-retardant power cables can be laid in indoor, tunnel and pipeline with flame retardant and halogen-free and low smoke requirements. WDZA-YJY23,WDZA-YJLY23,WDZB-YJY23,WDZB-YJLY23 ,WDZC-YJY23,WDZC-YJLY23,

Class A (B, c) flame retardant power cables with cross-linked polyethylene insulation and steel strip armored polyolefin sheath are suitable for buried laying when flame retardant and halogen-free low smoke are required, and are not suitable for laying in pipelines.

VV, VLV, copper (aluminum) core PVC insulated and PVC sheathed power cables are laid indoors, in tunnels and pipelines or in outdoor brackets without bearing pressure and external mechanical forces

Vy, Vly, copper (aluminum) core PVC insulated PE sheathed power cable

Vv22, vlv22, copper (aluminum) core PVC insulated steel strip armored PVC sheathed power cables are laid in indoor, tunnel, cable trench and directly buried soil. The cable can withstand pressure and other external forces

Vv23, vlv23, copper (aluminum) core PVC insulated steel strip armored polyethylene sheathed power cable

Service characteristics of high voltage cable

The product is suitable for power supply, transmission and distribution with AC rated voltage of 35kV and below, and can be used for fixed lines. The maximum long-term working temperature of cable conductor is 90 ℃, and the maximum temperature of cable conductor is not more than 250 ℃ in case of short circuit (the longest time is less than 5S).

UHV cable
1kV and below are low voltage cables; 1kV ~ 10kV are medium voltage cables; 10kV ~ 35kV are high voltage cables; 35 ~ 220kV are UHV cables;

UHV cable is a kind of power cable with the continuous development of cable technology. As the central link of large-scale transmission system, UHV cable is a kind of high-voltage cable with high technology content, which is mainly used for long-distance power transmission.