Installation Examples - Omron KE1 User Manual

 Installation examples
Example of correct installation
Have all of 2-, wire 3- wire, or 4-wire run through the opening of
ZCT in single-phase 2-wire, single phase 3-wire, 3-phase 3-wire,
or 3-phase 4-wire systems
K L
Model
Type B earth wire
KE1
To avoid malfunction caused by the load current of the neutral
line, be sure to have the Type B earth wire run through the
opening of ZCT.
B
A
K K
L L
Model
KE1
Type B earth wire
Install Type D earth wire separately without connecting the
distribution board and neutral line.
K L
Model
Type B earth wire
KE1
Type D earth wire
Have cables run through ZCT properly.
K K L L
Model
KE1
Connect the voltage transformer case, cubicle case, iron angle,
and frame that work as frame ground to the earth wire at a
location closer to the earth compared to the installation location of
ZCT.
K K
L L
Model
KE1
Type B earth wire
Examples of incorrect installation
Malfunction arises from the load current of the neutral line.
K
Type B earth wire
Malfunction arises from the load current diverted into Types A
and B earth wires.
A
K
Type B earth wire
Malfunction arises from the diverted current between A and B due
to the load current of the neutral conductor.
ZCT may not work when a leakage occurs.
A B
Type B earth wire
If the distribution board and neutral line are connected, load
current is diverted into the earth wire and malfunction occurs.
K
Distribution
Type B earth wire
board
Correct leakage current value is not shown.
K L
As a leakage of current directly returns to the earth of the voltage
transformer and does not pass through the ZCT, ZCT does not
work even when a leakage occurs.
K
L
Type B earth wire
3.4 Leakage detection function
L
Model
KE1
B
L
Model
KE1
K
L
Model
KE1
L
Model
Distribution
KE1
board
Type D earth wire
Model
KE1
Model
KE1
3-15