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
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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
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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.
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5. Switchgear devices
 Protection devices
 Circuit breakers
 MCCB
 Relays
 Fuse
 Isolating devices
 Isolator/ Earth switch, MCB, SFU
 Measuring
 CT, PT
 Ammeter, Voltmeter, Energy meter
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6. Switchgear classification
 By voltage class
 LV, MV, HV, EHV
 Outdoor
 VCB, ABCB, SF6
 Indoor
 Vaccuum contactor, ACB
 Metal enclosure, Metal clad
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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
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8. CB & Relay
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9. Circuit Breaker
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10. MCCB
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11. Relay
 Numerical Relay,
 Overload Relay,
 Coupling Relay
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12. Isolating devices
 Isolator, SFU, MCB
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13. Thank you all
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