The document discusses different types of switchgear used in electrical systems, including their classification, functions, and components. It covers circuit breakers, molded case circuit breakers (MCCB), relays, isolating devices, and the differences between metal enclosed and metal clad switchgear. Specific topics discussed include induction motors, synchronous motors, DC motors, starting methods, and speed control methods for different motor types.

1. M. Nageswar Rao,
Sr.Mgr.(EMD)
Date: 03.10.2015

2. Presentation Layout
 Motor applications
 Induction Motors
 Starting methods
 Speed control methods
 Synchronous Motors
 Starting methods
 Speed control methods
 DC Motors
 Starting methods
 Speed control methods
2

3. Switchgear
 Switch
 Electrical device used to open/close current path in an
electrical ckt.
 Switchgear
 Combination of switching devices with associated eqpt. of
 Control
 Measuring
 Protection
3

4. Switchgear
 Functions
 Carrying normal load current
 Making/ breaking normal load current
 Clearing the fault current
 Parts of swgr.
 Switching devices
 Power ckt.
 Control ckt.
4

5. Switchgear devices
 Protection devices
 Circuit breakers
 MCCB
 Relays
 Fuse
 Isolating devices
 Isolator/ Earth switch, MCB, SFU
 Measuring
 CT, PT
 Ammeter, Voltmeter, Energy meter
5

6. Switchgear classification
 By voltage class
 LV, MV, HV, EHV
 Outdoor
 VCB, ABCB, SF6
 Indoor
 Vaccuum contactor, ACB
 Metal enclosure, Metal clad
6

7. Metal clad vs Metal enclosure
Metal Enclosed swgr. Metal Clad swgr:
 switchgear is assembled
inside standard metal
enclosures.
 Different chambers are made
like breaker chamber, bus bar
chamber, LT Chamber, Cable
chamber etc
7

8. CB & Relay
8

9. Circuit Breaker
9

10. MCCB
10

11. Relay
 Numerical Relay,
 Overload Relay,
 Coupling Relay
11

12. Isolating devices
 Isolator, SFU, MCB
12

13. Thank you all
13