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.)