YOKOGAWA WT332E - Guide for Selecting the Method Used to Measure the Power

2-20
IM WT310E-02EN
2.8 Guide for Selecting the Method Used to
Measure the Power
Select the measurement method from the table below according to the amplitude of the measured
voltage or current. For details about a wiring method, see the section indicated in the table.
Voltage Measurement Methods
When the Voltage
Is 600 V or Less
When the Voltage
Exceeds 600 V
→ section 2.9
Voltage
wiring
Direct input is not possible.
→ section 2.11
Direct input
Voltage transformer (VT)
Current Measurement Methods
When the Voltage Is 600 V or Less
When the Current
Is 20 A or Less
When the Current
Exceeds 20 A
When the Current
Is 40 A or Less
When the Current
Exceeds 40 A
When the Voltage
Exceeds 600 V
→ section 2.9
Current
wiring
Product
name
Direct input is not possible.
Shunt-type current
sensors cannot be used.
→ section 2.10
→ section 2.10
→ section 2.11
→ section 2.11
Direct input
WT310E/WT332E/WT333E
WT310EH
Shunt-type current sensor
Clamp-type current sensor
(voltage output type)
Clamp-type current sensor
(current output type)
Current transformer (CT)