China Zhenglan Cable Technology Co., Ltd Company News

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When the power cable passes through a certain load current, it will certainly generate heat. With the increase of load current, the surface temperature of the cable will be higher. If it is not handled in time, the consequences can be imagined.Such as: Polyvinyl chloride (PVC) cable, core temperature 70 degrees for the upper limit of consideration, the surface temperature will be low 5 ~ 10 degrees.So the cable surface temperature below 60 degrees is basically safe, from the power maintenance considerations, of course, the lower the temperature is the better. (1) Conductor resistance of the cable does not meet the requirements, resulting in the cable heating phenomenon in operation. (2) Improper cable selection causes the conductor section of the used cable to be too small, resulting in overload in operation. After a long time of use, the imbalance of heating and heat dissipation of the cable will cause heating phenomenon. (3) The cables are arranged too densely, the ventilation and heat dissipation effect is not good, or the cables are too close to other heat sources, which will affect the normal heat dissipation of the cables and may also cause the heating phenomenon in the operation of the cables. (4) Due to poor joint manufacturing technology and tight compression, the contact resistance at the joint is too large and the cable will generate heat. (5) Poor interphase insulation performance of cables, resulting in small insulation resistance and heating phenomenon in operation. (6) Partial sheathing damage of armored cable will cause slow damage to insulation performance after water inlet, gradually reducing insulation resistance and causing heating phenomenon during cable operation.

The expected May Day holiday is juest around the corner. Zhenglan Cable to wish all of you a wonderful, outstanding, cheerful and splendid holiday! Our Holiday from 1st to 5th, return to work on 6th.

Aluminium Conductor Steel Reinforced (ACSR) is concentrically stranded conductor with one or more layers of hard drawn 1350-H19 aluminium wire on galvanized steel wire core. The core can be single wire or stranded depending on the size. Steel core wire is available in Class A , B or Class C galvanization for corrosion protection. Additional corrosion protection is available through the application of grease to the core or infusion of the completed conductor with grease.   The proportion of steel and aluminium in an ACSR conductor can be selected based on the mechanical strength and current carrying capacity demanded by each application.   ACSR conductors are recognized for their record of economy, dependability and favourable strength / weight ratio. ACSR conductors combine the light weight and good conductivity of aluminium with the high tensile strength and ruggedness of steel. In line design, this can provide higher tensions, less sag, and longer span lengths than obtainable with most other types of overhead conductors.   Zhenglan Cable manufacture and supply ACSR on Non-Returnable wooden/steel reels or Returnable steel reels depending on customer requirement.   Features high Tensile strength better sag properties economic design best suited for transmission lines with long spans   Specifications ACSR manufactured by Zhenglan Cable meets or exceeds the requirements of all international standards like ASTM, AS, BS, CSA, DIN, IEC, NFC, SS -etc  

      Data from the Spanish National Grid Red Electrica de España (REE) shows that total wind power is 5.543 GWh, accounting for 27% of the country ’s total electricity demand in March.The Spanish Renewable Energy Association AEE said that the reduction in demand and the increase in power generation have resulted in the lowest price of wind power in four years, at 27 euros / MWh.REE blamed the price decline on the Covid-19 coronavirus pandemic, noting that the country ’s demand for 2020 followed a trend similar to 2019 until the government introduced the first containment measures on March 9.Despite falling prices, the increase in wind power generation has reduced carbon dioxide emissions to a record low. Preliminary data from REE shows that greenhouse gas emissions have been reduced to 1.85 million tons, a 30% reduction.Compared with five years ago, emissions in 2020 decreased by 50%, from 0.17 tons / MWh to 0.09 tons / MWh.Spain ’s wind power demand has declined over the past decade, from its peak in 2010 (260,000 GWh) to less than 250,000 GWh in 2019.Spain is one of the countries hardest hit by the coronavirus pandemic, not only in terms of number of cases, but also in terms of economy, especially in the power sector.According to REE data, the country ’s electricity demand has decreased by 4.6% compared to 2019 to 20,924 GWh.  

Fire-resistant cables:   Fire-resistant cable refers to a cable that can maintain safe operation for a certain period of time in the case of flame burning. China's national standard GB12666.6 (such as IEC331) divides the fire resistance test into two levels, A and B. The flame temperature of Class A is 950 ~ 1000 ℃, and the continuous fire time is 90min. min, during the entire test period, the sample should withstand the rated voltage value specified by the product. Fire-resistant cables are widely used in high-rise buildings, underground railways, underground streets, large power stations, and important industrial and mining enterprises and other places related to fire safety and fire rescue, such as power supply lines and control lines for emergency facilities such as fire equipment and emergency guide lights.   Use conditions of fire-resistant cables:   1. AC rated voltage: U. / U (V series: 600 / 1000V, K series: 450 / 750V, B series: 450 / 750V). 2. Maximum long-term working temperature of the cable (1) PVC insulation and sheath: both 70 ℃ and 105 ℃; XLPE insulation: 90 ℃; (2) Fluorine plastic insulation and sheath: 220 ℃ and 260 ℃; fluoroplastic insulation and 105 ℃ flame-retardant PVC sheath: 90 ℃ and 125 ℃. (3) Low-halogen and low-smoke flame retardant PVC insulation and sheath: 70 ℃; halogen-free and low-smoke flame retardant polyolefin insulation and sheath: 90 ℃ and 125 ℃.   3. Minimum ambient temperature: (1) Flame retardant PVC insulation and sheath: fixed laying -40 ℃; non-fixed laying -15 ℃; (2) Fluoroplastic insulation and sheath: fixed laying -60 ℃; non-fixed laying -20 ℃；   4. The safe laying temperature of the cable should not be lower than 0 ℃.   5. Fire resistance characteristics: Conforms to the provisions of IEC331 Conforms to the provisions of GB12666.6 Flame temperature 750 ℃ ​​Flame temperature 950 ℃ -1000 ℃ Flame temperature 750 ℃ ​​-800 ℃ Burning time 3h Burning time 90min Burning time 90min Cooling time 21h Additional voltage Rated voltage Additional voltage Rated voltage Additional voltage Rated voltage Additional current 3A Additional current 3A Additional current 3A Class A Class B   6. The recommended allowable bending radius for laying: unshielded, braided shielded cable should not be less than 6 times the outer diameter of the cable;   Steel tape armored cable should not be less than 12 times the outer diameter of the cable; Fluorine plastic insulated and sheathed material cables should not be less than 8 times the outer diameter of the cable.