Electrical Drive Systems and Components

Electrical Drive Systems and Components:

Electrical Drive Systems : Each Electrical Drive Systems is different from other Electrical Drive Systems. However, there are some common features associated with all Electrical Drive Systems. To understand them it is good enough to consider few examples. This approach has been adapted here. Normally, a Electrical Drive Systems receives its incoming ac supply from a Motor, Control Centre (MCC). MCC controls the power to few Electrical Drive Systems located in an area. In a large manufacturing plant, many such MCCs exist. These in turn receive the power from the main power distribution centre called Power Control Centre (PCC). Fig. 12.1 gives a typical layout of a plant level power distribution network. MCC and PCC normally use air circuit breakers as the power switching elements, with ratings up to 800 V, 6400 A maximum. Overloads are protected by the thermal overload relays. The short circuit protection is offered through the magnetic sensing/release mechanism …


Interlocking Components in Electrical Drives : Sensing of signals required for speed and current control loops. Sequencing and interlocking operations are explained in the previous section, whereas this section discusses components used in interlocking and sequencing operations, and protection. It should be noted that signals for Interlocking Components in Electrical Drives and sequencing operations must be obtained from potential free contacts. Relays: Both electromagnetic and solid state (electronic) relays are used. Electromagnetic relay coils have typical ratings of 12 V, 24 V, 48 V dc and output contact ratings up to 240 V, 5 A typically. Relays could have up to 4 N/O (normally open), 4 NC (normally closed) and 4 change over contacts. The N/O, N/C and changeover contacts are shown in Fig. 12.8. In a solid state relay, the relay function is achieved by means of electronic Interlocking Components in Electrical Drives. It also has isolated input and output, but no moving …


Updated: April 30, 2020 — 5:36 pm