Delta connection also used to
400V
Three-phase
and neutral load
Brown phase
Black phase
Grey phase
Blue neutral
Substation transformer
11kV/400V
11kV
400V
400V
Three-phase
load
230V
Single-
phase
load
230V
Single-
phase
load
230V
Single-
phase
load
400V
Single-
phase
load
FIGURE 11.5
Three-phase four-wire distribution. The important relationship between
phase and line currents and voltages also shown.732. generator may star connected or
delta connected shown Fig.
Balancing single-phase loads
A three-phase load such motor has equally balanced phases since the
resistance each phase winding will the same.
. The square root 3
(兹3) simply constant for three-phase circuits, and has value 1.6.c. When connecting single-phase loads to
a three-phase supply, care should taken distribute the single-phase
loads equally across the three phases that each phase carries approxi-
mately the same current.
Star and delta connections
The three-phase windings a. Therefore, the current
taken each phase will equal.Polyphase three-phase electrical systems
225
At the main’s intake position, the supplier will provide sealed HBC fuse
and sealed energy meter measure the consumer’s electricity consump-
tion. 11. lighting load of
18 luminaires would ‘balanced’ six luminaires were connected each
of the three phases.
The delta connection used for electrical power transmission because
only three conductors are required. Equally distributing the single-phase loads across
the three-phase supply known ‘balancing’ the load. after this point that reach the consumer’s installation
