China Zhenglan Cable Technology Co., Ltd Company Cases

This is a project for housing project in block 1&5 building 3 of 12th Storey, 177 Unit in Myanmar 2021. Total cable quantity need is around 476000meters. All are electrical wire and low voltage power cable types.       

Photovoltaic cables are single-core wires used to interconnect solar panels in photovoltaic systems. These years, the use of solar power aquires a lot of attention. Solar cable are much more needed than before.   These cables usually adopts tinned copper with insulation and outer sheath to be XLPO.  Different packing styles are available 100m/roll, 200m/roll, 500m/drum, 1000m/drum, etc.   This Urguary customer require 500m/drum in case of cable get entangled during use.

Customer from Myanmar ordered ACSR-AW/OC 33kV 240mm2 from Zhenglan to be installed in one industrial zone in Yangon, Myanmar after approvement by YESC. Customer's working site

Zhenglan Cable supplied cable items to support project contracted by China mechanical equipment Engineering Co., Ltd. (CMEC)  450/750V Cu/PVC single core wire---2.5sqmm, 4sqmm, 6sqmm 300/500V Cu/PVC/PVC three core electrical wire--3Cx2.5sqmm 450/750V Al/PVC single core aluminum wire--70sqmm Flexible rubber cable--2Cx1.5sqmm, 2Cx2.5sqmm, 3Cx6+1Cx2.5sqmm; Welding cable--50sqmm

Basics of Underground Electric Transmission Explained   The transmission of electrical power can be done overhead rather than underground using different types of transmission cables. These types of electrical power transmissions have their own benefits, pitfalls and also applications where it is frequently used. The selection of method mainly depends on the factors like cost, voltage, safety, application, etc. The overhead power transmission is cheap and the installation process is cheap. Whereas, underground power transmission is expensive and also has many advantages. The applications of this transmission mainly depend on the crowd areas as well as where the possibility of overhead power transmission is not possible. Sometimes, due to factors like physical, cost and environmental, the two types of cables are combined together for electrical power transmission. What is Underground Electric Transmission?   The electric power transmission can be done using a method like undergrounding as an alternative to overhead power transmission. These cables have low visibility and not affected by bad -weather. But, the cost of these cables is high and laying process is time-consuming instead of overhead building. The finding of faults in underground transmission lines takes much time for repairing as well as locating. In urban areas, this type of transmission is enclosed with shielded with dielectric liquid and a metal pipe that is either fixed or spread through pumps. If an electric-fault breaks the underground pipe & generates a dielectric liquid into the nearby mud, then the liquid nitrogen trucks are assembled to fix the damaged part of the pipe location. This kind of transmission cable can extend the fixed period as well as the cost of repair. The stats of the pipe and soil are monitored frequently throughout the period of repair.

ACSR (Aluminium Conductor Steel Reinforced)   It’s a bimetallic conductors. The inner layers are composed by steel wires and the external layers are composed by hard-drawn aluminium AA1350-H19. The steel wires guarantee high mechanical performances. This kind of conductor is used for medium and long spans thanks to the high value of specific mechanical resistance and good transport capacity.   The steel section will change to obtain the RTS requested. The modulus of elasticity of single steel wire is three time greater than an aluminium single wire. The final modulus of elasticity is defined by the composition of ACSR conductor (number of steel wires, number of aluminium wires). The same behaviour will be found for the coefficient of linear expansion. The final value is determined by the single value of the material used and the modulus of elasticity and the section of the two components. To guarantee the protection of steel, a thin zinc coating on the wire is carried out. The zinc coating is important to prevent the galvanic corrosion.   ACSR conductors has always been given high reliability thanks for the presence of steel that ensures the conductor large safety margins.