Electrical Hub

 the  following method is used to laying underground cables. 1. Laying in Ground A.       Direct Laying B.       Duct/Pipe Laying or Draw in System C.       Trough Laying or Solid System 2. Racking on the wall or on overhead structure 3. Racking in Tunnel   now we will discuss all the method in the description. 1. Laying in Ground In this method, the cable is buried in the ground. it is necessary to know the condition of the soil before planting. which is include ambient temperature, the resistivity of soil, presence or absence of the corrosive material or moisture, presence of other cables and its distance, presence of water line, telephonic line, drainage line or gas line etc. A. Direct Laying In this method, the cable is laid directly under the ground. in which a trench 0.5 meter wide & 1.2 meter Dug is required & bed of sand 100 mm thick. now cable is laid on thi...

classification of underground cable is done on varies basis. 1) ON THE BASIS OF NUMBER OF CORE 2) ON THE BASIS OF VOLTAGE 3) ON THE BASIS OF APPLICATION 4) ON THE BASIS OF INSULATION 5) ON THE BASIS OF SHEATH 6) ON THE BASIS OF ARMOURING 7) ON THE BASIS OF CONSTRUCTION   Base on Above Classification, we will summerise. 1) ON THE BASIS OF NUMBER OF CORE 1 - core 2 - core 3 - core 3.5 - core 4 - core   2) ON THE BASIS OF VOLTAGE A. Low Tension (LT) cable _ operating voltage up to 1KV B. High Tension (HT) cable _ operating voltage up to 11KV C. Super Tension (ST) cable _ operating voltage up to 33KV D. Extra High Tension (EHT) _ operating voltage up to 66KV E. Extra Super Tension (EST) _ operating voltage up to 132KV   3) ON THE BASIS OF APPLICATION A. Power Cable _ Use for transmission & Distribution of Power. B. Control Cable _ Used for transmission of Control Signals.   4) ON THE BASIS OF INSULATION A. Rub...

What is the transformer? the transformer is an electromagnetic device there is no rotating part. which is transfer te electrical energy from one circuit to another circuit without changes in Frequency & by step and step down the voltage and current. t he transformer can transfer power such as AC and DC. but now a day AC transformer is using than DC transformer due to some of the criteria. There are three primary types of voltage transformers (VT): electromagnetic, capacitor, and optical. The electromagnetic voltage transformer is a wire-wound transformer. The capacitor voltage transformer uses a capacitance potential divider and is used at higher voltages due to a lower cost than an electromagnetic VT. PRINCIPLE OF OPERATION An alternating current applied to the primary winding induces an alternating magnetic flux in the iron core. Most of this flux stays within the core and only a small percentage of it travels through the air. The alternating magnetic flux in the iron core then l...