KW1M-H Eco-POWER METER
8
◇
To connect CT with secondary side current 5A
How to set for measuring by combination with CT (secondary side current 5A)
(1) Select 5A at CT type setting mode (CT-T).
(2) Set the primary current of measured CT (secondary side current 5A) at primary side current of
CT setting mode (CT-1).
<ex> If the measured CT is 400A/5A, set to’400’.
(3) Clamp the dedicated CT for 5A, which is connected to the main unit first, to secondary side of
the CT (secondary side current 5A). CT direction (K
→
L) should be set for the commercial CT
direction.
*Set the CT (secondary side current 5A) and the dedicated CT for 5A approximately 1m apart.
If the two CTs are set too close each other, it may not measure accurately due to magnetic
field interference.
(Connection example)
With Ammeter etc.
Without Ammeter
Secondary current
Breaker
Dedicated CT for 5A
Ammeter etc.
Power supply
CT with 2nd current 5A
L K
K
L
Eco-POWER
METER
Load
Secondary current
Breaker
Power supply
CT with 2nd current 5A
K
L
Load
Dedicated CT for 5A
L K
Eco-POWER
METER
Shorted or resistor less than 0.1
Ω