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Star Delta starter working principles, control circuit, components, advantages and disadvantages

  Star delta starter working principle theory There are many different starting methods are used to start a three-phase induction motor like Star delta starter. One of them, popular and cheapest is a Direct online starter. But its use limited for smaller HP motor, to start higher rating 3 phase motors star-delta starter is used. Star-delta starter is useful where all six terminals of the motor are accessible.  we will discuss star delta starter working principle with help of power and control diagram, Theory, connection wiring diagram, parts like contactor, mcb, fuses, a timer circuit, overload relay. Star-Delta starter is the simplest starting method for reducing the inrush starting current of Induction motor. The starter can be used with all squirrel-cage induction motors that are delta-connected for normal operation.  The reduction of the high motor current causes a reduction of the starting torque of the motor. Star-delta starting is therefore especially suitable for drives that a
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How to do Installation and termination of Electrical cables(HV, MV, LV)?

How to do Installation and Termination of Electrical cables(HV, MV, LV) : 1.Material : All wires and cables to be examined prior to installation. No wire or cable with bruised, cut or abraded insulation, or wire that does not pass a continuity test shall be used. 2.Tools and equipment : Truck, crane, cable drum jacks, cable drum shaft, cable socks, cable rollers, cable cutter, hydraulic crimping tools, hand crimping tools, scaffolding with wheels, ladders, torque wrench, box spanner set, ring spanner set, open end spanner set, screw driver, hack saw frame, measuring tape, drilling machines, holesaw cutter, cutting pliers.  3.Preparation : Cables shall be identified with regard to type, size, length etc. And shall be inspected for any physical damage. The cable shall be free from any damages and the ends sealed with caps to prevent the ingress of water during transportation or storage.  4.Installation : All cable shall be megger tested prior to pulling cable.  Prior to commencing the ca
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Vaccum circuit breaker construction, working principle, advantages and disadvantages.

  Vacuum Circuit Breaker A breaker which used vacuum as an arc extinction medium is called a vacuum circuit breaker . In this circuit breaker, the fixed and moving contact is enclosed in a permanently sealed vacuum interrupter. The arc is extinct as the contacts are separated in high vacuum. It is mainly used for medium voltage ranging from 11 KV to 33 KV. Vacuum circuit  breaker  has a high insulating medium for arc extinction as compared to the other circuit breaker  .  The pressure inside the vacuum interrupter is approximately 10 -4   torrent and at this pressure, very few molecules are present in the interrupter. The vacuum circuit breaker has mainly two phenomenal properties. High insulating strength: In comparison to various other insulating media used in circuit breaker vacuum is a superior dielectric medium. It is better than all other media except air and SF 6 , which are employed at high pressure. When an arc is opened by moving apart the contacts in a vacuum, an interruptio
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