Electrical Basics

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Electrical Basics

  1. 1. Terminal Connector
  2. 2. CONTACTOR is a spring actuated mechanism having a set of double-breaking power contacts. It also have a set of auxiliary contacts, generally 2 NO & 2NC, which are used for control wiring.
  3. 3. Distribution Box   . 24 Lines 12 Lines 8 Lines 4 Lines 3 Phase 3 Phase 1 Phase 1 Phase
  4. 4. Earth Leakage Circuit Breakers
  5. 5. <ul><li>ELCB </li></ul><ul><li>is used for the protection against electrical leakage in the circuit. When somebody gets an electric shock or the residual current of the circuit exceeds the fixed value, ELCB cuts off the power within the time of 0.1s automatically protecting the personal safety and preventing the equipment from the fault. ELCB also protect the circuit against over load and short-circuit. </li></ul>Earth Leakage Circuit Breakers
  6. 6. Mini Circuit Breaker It is used for protecting the circuit against overload and short circuit. It can be used in lighting and electric motor distribution system.
  7. 7. It is used to control electric energy in distribution network and is having overload and short circuit protection MCCB
  8. 8. Residual Current Circuit Breakers to open a circuit automatically in the case of an earth leakage fault between phase and earth and/or neutral greater than a set current generally 300mA. It is used in domestic, commercial and industrial installations.
  9. 9. Screw Circuit Breaker
  10. 10. Mirco Switch
  11. 11. General Relay Suitable for DC or AC circuit switching in various automation devices, process control and communication equipments
  12. 12. The plug-in base of the relay is used with standard 8 and 11 pins socket
  13. 13. SOLID STATE RELAY
  14. 14. Isolating Switches
  15. 15. Direct On Line Starter DOL magnetic starter is mainly used for controlling motors up to 7.5 HP .It also has an OVER LOAD RELAY for protecting the motor against overloading.
  16. 16. STAR-DELTA Starter
  17. 17. STAR – DELTA Starter <ul><li>STAR-DELTA STARTER IS GENERALLY USED FOR CONTROLLING MOTORS ABOVE 7.5 HP AND CONSISTS OF FOLLOWINGS: </li></ul><ul><li>ONE MAIN CONTACTOR </li></ul><ul><li>ONE STAR CONTACTOR </li></ul><ul><li>ONE DELTA CONTACTOR </li></ul><ul><li>ONE ON-DELAY TIMER </li></ul><ul><li>ONE OVERLAOD RELAY </li></ul><ul><li>SET OF AUXILLARY CONTROL CONTACTS </li></ul>
  18. 18. STAR-DELTA Starter power wiring diagram
  19. 19. Thermal Overload Relay
  20. 20. Motor control centre An MCC is a large enclosure designed to house standard motor control equipment. The unique characteristic of an MCC is that the motor controls are contained in plug-in units. Ability to Plug In control components can plug in and unplug instead of having to wire each device. For example : a combination starter can be plugged into a motor control center just like you would plug in a household device such as a lamp. However, in an MCC, the user can feed much larger loads. Note that industrial motors operate on three phase power, unlike a typical household device; this is why MCC units have three power stabs plus a fourth stab to provide a means for grounding.
  21. 21. Motor control centre
  22. 22. Advantages of MCCs <ul><li>Lower Wiring and Mounting Cost Only one set of incoming power wires needs to be routed to the MCC. The MCC distributes power to all devices through its power bus network. MCC units are pre-wired. Rather than mounting each of many small enclosures to the wall, a whole MCC can be quickly mounted to the floor. </li></ul><ul><li>Expandability </li></ul><ul><li>Neater Appearance </li></ul><ul><li>Reduced Downtime </li></ul><ul><li>problem is traced to an MCC unit easily, it can be unplugged and a spare unit can be quickly plugged in. </li></ul><ul><li>A single MCC unit can be serviced while all other units remain energized. </li></ul>
  23. 23. Standard MCC in one large enclosure
  24. 24. <ul><li>Increased Level of Safety MCCs incorporate extra safety features, such as handle interlocks to prevent the removal of a unit when it is energized, and non-conductive barriers to protect personnel from energized bus bars. </li></ul><ul><li>Reduced Space Requirements </li></ul><ul><li>Faster Delivery MCCs are standardized which increases efficiency in production and reduces delivery time. </li></ul>
  25. 25. Plug in a combination starter Plug in an electric device
  26. 26. Power control centre

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