Electrical Engineering blog

AIR CIRCUIT BREAKER  ① Front cover ② Arc extinguish chamber ③ Control circuit terminal ④ Electronic trip relay ⑤ Counte ⑥ Closing button ⑦ Charging handle ⑧ Name plate ⑨ Caution mark ⑩ position indicator ⑪ Pushing/Drawing lever hole ⑫ Charging indicator ⑬ Extension rail ⑭ Trip button ⑮ ON/OFF indicator (16) Draw-out profile (17) Main body profile (18) Handle MUHAMMAD NAEEM ABA ENGINEERING

VCB WORKING AND  PRINCIPLE A vacuum circuit breaker is a kind of circuit breaker where the arc quenching takes place in vacuum medium. The operation of switching on and closing of current carrying contacts and interrelated arc interruption takes place in a vacuum chamber in the breaker which is called vacuum interrupter. ABA ENGINEERING MUHAMMAD NAEEM

POWER TRIANGLE AND POWER FACTOR ABA ENGINEERING MUHAMMAD NAEEM

During this self starting period, as torque increases, a large amount of current flows in the rotor. To achieve this the stator draws a large amount of current and by the time the motor reaches its full speed, a large amount of current is drawn and coils get heated up, damaging the motor. Hence there is a need to control the motor starting. One way is to reduce the applied voltage, which in turn reduces the torque. Objectives of Star-Delta Technique Motor Starter are: Reduce high starting current and along these lines forestall motor from overheating Provide over-burden and no-voltage assurance Star Delta Starter: In star delta starting, the motor is connected in STAR mode throughout the starting period. When the motor reached the required speed, the motor is connected in DELTA mode. Components of a Star-Delta Starter: Contactors:   The Star- Delta starter circuit comprises of three contactors: Main, star and delta contactors. The three co...

Fluke Multimeter: The fluke Multimeters are protected against the transient voltage. It is a small portable device used to measure voltage, current and test diodes. The multi meter has multi selectors to select the desired function. The fluke MM automatically ranges to select most measurements. This means the magnitude of the signal does not have to be known or determined to take an accurate reading, it directly moved to the appropriate port for the desired measurement. The fuse is protected to prevent the damage, if connected to wrong port. MUHAMMAD NAEEM ABA ENGINEERING

            HISTORY OF PLC PROGRAMMING History Industrial automation began long before PLCs. In the early to mid 1900s, automation was usually done using complicated electromechanical relay circuits. However, the amount of relays, wires and space needed to create even simple automation was problematic. Thousands of relays could be necessary to automate a simple factory process! And if something in the logical circuit needed to be changed? Oh boy! NOTE: On a basic level, electromechanical relays function by magnetically opening or closing their electrical contacts when the coil of the relay is energized. The are very useful devices and still play a major role in industrial automation (for a more in-depth lesson on electromechanical relays check out this  post ). In 1968 the first programmable logic controller came along to replace complicated relay circuitry in industrial plants. The PLC was designed to be easily programmable by plant eng...