Huawei DTSU666-HW Quick Manual page 5

Each phase of UA, UB, and UC in the
Smart Power Sensor is connected with
a fuse and a thermistor to prevent
damage caused by external short
circuits. UA, UB, and UC do not need
external fuse protection.
Wiring Scenarios
3.2
Current
Line voltage
Connection Current and voltage
mode direct connection
Connection Direct connection:
setting SPEC = 1 (default)
Current
transformation
ratio
Potential
transformation
ratio
3P4W:
Wiring
net = n.34
mode
(default)
You need to set parameters after cable connections are complete. For details, see section 4
"Display and Parameter Settings".
≤ 80 A
≤ 500 V
Connection through
current transformers and
voltage direct connection
CT = 1
(default)
PT = 1.0
(default)
3P4W:
3P3W:
net = n.34
net = n.33
(default)
> 80 A
Connection through transformers:
SPEC = 0
CT = Ratio of the installed
current transformer
3P3W:
net = n.33
4
≥ 0 A
> 500 V
Connection through current
transformers and potential
transformers
PT = Ratio of the installed
potential transformer
3P4W:
3P3W:
net = n.34
net = n.33
(default)