Lv and Mv Switchgear 7

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Lv and Mv Switchgear

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LV&MV Switchgear #7 LV&MV Switchgear #7
Types of Outgoing Feeders Types of Outgoing Feeders
• Motor Starter: LV&MV 
• Circuit Breaker: LV&MV 
400V, 3Ph
Motor Starter: LV Motor Starter: LV
1 P S l f C l Ci i 1. Power Supply of Control Circuit
2. Closing Circuit
3. Opening Circuit
4. Indication Lamp
Power Supply of Control Circuit Power Supply of Control Circuit
400/230 /
Motor Starter: LV Motor Starter: LV
1 P S l f C l Ci i 1. Power Supply of Control Circuit
2. Closing Circuit
3. Opening Circuit
4. Indication Lamp
Motor Starter
400V, 3Ph
Contactor’s 
Bobbin
Motor Circuit
230V
Stop
Start
Contactor’s 
Bobbin
N
Substation
Central Control Room
Substation
Permit Permit
ON ON
Motor Circuit
230V
Stop
Start
Contactor’s 
Bobbin
N
Motor Circuit
230V
Stop
Start
Contactor’s 
Bobbin
N
Substation
Central Control Room
Substation
Permit
ON
Permit
ON
ON ON
Motor Circuit
230V
Stop
R
L
R
Start Start
Contactor’s 
Bobbin
N
Substation
Central Control Room
Substation
ON/OFF 
Command
Interlocks Interlocks
Motor Circuit
230V
Stop
Start
Contactor’s 
Bobbin
230V
Service
1
24V,L(‐)
Service
2
K01
3
4
5
On/Off
Coupling
Relay
K01
Relay 
K1
N
Motor Starter: LV Motor Starter: LV
1 P S l f C l Ci i 1. Power Supply of Control Circuit
2. Closing Circuit
3. Opening Circuit
4. Indication Lamp
Substation
Central Control Room
Substation
Off
Off
Off
ESD 
Command
Off
Off
Motor Circuit
230V
ESD 
Stop
Panel
Emgy.
Stop 
L
R
DCS
Start Start
Contactor’s 
Bobbin
N
Motor Protection Motor Protection
• Relay Relay
• Temperature Sensor
• Earth Leakage • Earth Leakage
Overload Relays Overload Relays
• Thermal Overload Relays Thermal Overload Relays
• Electronic Overload Relays
400V, 3Ph
400V, 3Ph
Motor Starter: LV Motor Starter: LV
1 P S l f C l Ci i 1. Power Supply of Control Circuit
2. Closing Circuit
3. Opening Circuit
4. Indication Lamp
230V
Service
T
1
24V,L(‐)
Earth
Fault
Service
Test
P.B
2
K01
24V,L(+)
Fault
PTC
Test 3
4
Fault
Signal
Running
K2
K1
ESD
Bimetal
5
Signal
On/Off
Coupling
C B
K01
K2 K1
K1
Coupling
Relay 
1
K1 K2
C.B
1
2
ESD
Fault Open Closed
N
Substation
Central Control Room
Substation
Running 
Signal
F lt Fault 
Signal
ON/OFF 
ESD 
Command
Command
Interlocks Interlocks
Motor Starter Motor Starter
• Type 1 Type 1 
• Type 2
Type 1 coordination Type 1 coordination
Type 1 coordination requires that in a short‐ Type 1 coordination requires that in a short
circuit condition, the contactor or starter must 
not present any danger to personnel or not present any danger to personnel or 
installations and must not be able to resume 
operation without repair or the replacement operation without repair or the replacement 
of parts.
Type 2 coordination Type 2 coordination
Type 2 coordination requires that In a short‐ ype coo d at o equ es t at a s o t
circuit condition, the contactor or starter must 
not present any danger to personnel or 
ll d b l b bl installations and must subsequently be able to 
resume operation. The risk of contact welding is 
permissible; in this case the manufacturer must permissible; in this case, the manufacturer must 
indicate measures to be taken regarding 
maintenance of the equipment. q p
• Type 2 coordination increases reliability of 
operation.
Motor Circuit
230V
Stop
Start
Contactor’s 
Bobbin
N

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