Sponsored by
Single phase
Line or cable Three phase
Line or cable
Short
circuit
Earth
electrode
Outgoing feeder Supply incoming
feeder
CIRCUIT DIAGRAM SYMBOLS USED IN
DISTRIBUTION SYSTEMS
EXAMPLE : Danger of short circuit
Sponsored by
Resistor Variable
resistor
Reactor or transformer,
motor or generator
winding
Iron core
reactor
Capacitor
Impedance
(Z, R, L, or C)
CIRCUIT DIAGRAM SYMBOLS USED IN
DISTRIBUTION SYSTEMS (Cont.)
Sponsored by
Star connected
winding
Delta connected
winding
Varistor or
surge
arrester
Spark gap or
overvoltage
limiter
Diode
Thyristor
CIRCUIT DIAGRAM SYMBOLS USED IN
DISTRIBUTION SYSTEMS (Cont.)
Sponsored by
Inverter Rectifier
Source of
current Metering
Measuring
device Electrical power
outlet
CIRCUIT DIAGRAM SYMBOLS USED IN
DISTRIBUTION SYSTEMS (Cont.)
JM
Sponsored by
Isolator
Fuse Switch fuse
Circuit
breaker
Circuit-breaker fitted with a
(thermal) overload and
(magnetic) short-circuit trip relay
CIRCUIT DIAGRAM SYMBOLS USED IN
DISTRIBUTION SYSTEMS (Cont.)
Switch
disconnecter
345 kV Switch Disconnecter
500 kV Switch Disconnector
EXAMPE : Opening HV switch disconnectors
Sponsored by
Contactor Fuse contactor
Drawout
circuit
breaker
Changeover switch
Changeover
circuit breaker Transformer
CIRCUIT DIAGRAM SYMBOLS USED IN
DISTRIBUTION SYSTEMS (Cont.)
Sponsored by
Transformer fitted
with an on-load tap
changer
Voltage
transformer
Artificial or
earthing
transformer
Battery
Current
transformer AC generator or
alternator
CIRCUIT DIAGRAM SYMBOLS USED IN
DISTRIBUTION SYSTEMS (Cont.)
G
AG MAsynchronous
generator Motor
SOME ABREVIATIONS
UPS : Uninterruptible Power Supply
N : Neutral
NC : Normally Closed
NO : Normally Open
EXAMPLE SYSTEM
EXAMPLE SYSTEM (Cont.)
EXAMPLE SYSTEM (Cont.)
Top Related