Lv and Mv Switchgear 1

LV&MV Switchgear #1 LV&MV Switchgear #1
Power System Power System
• Generators Generators
• Transformers
T i i Li • Transmission Lines
• Transformers
• Cables
• Loads Loads
Power System Power System
• Generators
•Distribution
Generators
• Transformers
T i i Li
•Distribution
•Switching
• Transmission Lines
• Transformers
•Switching
•Protection
• Cables
• Loads
•Protection
•Measuring
Loads
•Measuring
Power System Power System
•Distribution
S i hi
• Power
•Switching
P i
Devices
•Protection
M i
• Non-Power
Devices
•Measuring
Devices
Power System Power System
• Power
D i Devices
Substation
• Non-Power
Devices
Substation Substation
R S T
• Voltage
R S T
• Insulation • Insulation
R S T
Voltage
• Space
Substation Substation
Switchyard Switchgear Switchyard Switchgear
Substation : Switchgear
• IEC 60947-1
Substation : Switchgear
2.1.2
general term covering switching devices and their
bi i i h i d l i combination with associated control, measuring,
protective and regulating equipment, also
assemblies of such devices and equipment with q p
associated interconnections, accessories,
enclosures and supporting structures,
intended in principle for use in connection with intended in principle for use in connection with
generation, transmission, distribution and
conversion of electric energy.
Switchgear g
I
I
switching devices ,control, measuring,
protective and regulating equipment, also
bli f h d i d i t ith assemblies of such devices and equipment with
associated interconnections, accessories,
enclosures and supporting structures
O
O
O
O
O
O
Single Line Diagram Single Line Diagram
Bus
Typical Structures Typical Structures
Network Structures:
No#1
1 busbar, 1 supply source
Network Structures:
No#2
1- Both NC 1 Both NC
2- NO/NC
1 busbar with no coupler, 1 busbar with no coupler,
2 or more supply sources
Example Example
GG
GG
GG
Network Structures:
No#3 No#3
2 bus section with coupler, 2 supply sources 2 bus section with coupler, 2 supply sources
Network Structures:
No#4 No#4
DG DG
6kV
6kV
6kV 6kV
6kV
6kV
3 busbar with 2 couplers, 3 supply sources
Example Example
33/6.4kV
S=20MVA
DG DG
33/6.4kV
S=20MVA
6kV
S=2MVA
6kV
6kV
6kV
Emergency
Loads
Normal
Loads
Normal
Loads
Normal Condition
Example Example
33/6.4kV
S=20MVA
DG DG
33/6.4kV
S=20MVA
6kV
S=2MVA
6kV
6kV
6kV
Emergency
Loads
Normal
Loads
Normal
Loads
Emergency Condition
Network Structures:
No#5 No#5
Power
Grid
Power
Grid
33kV 33kV 33kV 33kV
6kV
6kV
DG DG
6
0.4kV
0.4kV
0.4kV
Switchgears Classification Switchgears Classification
based on Insulation
R S T
Switchgears: Insulation Switchgears: Insulation
R S T
• AIS: Air Insulated Substation
R S T
• GIS: Gas Insulated Substation
R S T
GIS: Gas Insulated Substation
ABB: GIS ABB: GIS
• ABB delivered the first gas insulated ABB delivered the first gas insulated
substation in 1967, and is the market and
technology leader today with more technology leader today, with more
installations and innovations than any other
company company.
W ld' l t SF6 i l t d • World's largest SF6 gas insulated
switchgear installation, at Three Gorges
D i Chi ELK 3 GIS 73 b 550 kV) Dam in China: ELK-3 GIS, 73 bays, 550 kV)
AIS vs GIS AIS vs GIS
• Space Space
E • Expenses
• Installation
• Maintenance
• …
Switchgears: Voltage Levels Switchgears: Voltage Levels
• LowVoltage Low Voltage
• Medium Voltage
• High Voltage
Switchgear: Low Voltage Switchgear: Low Voltage
• MCC: Motor Control Center
• Distribution Panel
Low Voltage: MCC
0.4kV 0.4kV
0 4kV 0 4kV 0.4kV 0.4kV
Low Voltage: MCC
MCC: Cell Types
Cell Types Cell Types
1. Incoming
4. Motor Feeders
2. Buscoupler
5. Capacitor Bank
3. Riser
6. C.B Feeders