What is VT ratio?
VT is used in high-voltage measurement to convert (step-down) the voltage
measured to a smaller level and supply the conversion result to an instrument.
VT ratio (voltage transformation ratio): A ratio used to convert the secondary volt-
age of VT to the primary voltage.
Example
When the primary voltage is 6600 V and the secondary voltage is 110 V, the VT
ratio is 60 (6600 V/110 V). In this case, as the rated measurement voltage is 110
V, set the voltage range to 150 V.
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Clamp sensor and current range:
Selectable current ranges vary according to the clamp sensor used.
Choose a clamp sensor head as appropriate for the measurement target.
Clamp sensors Range
Model 9660, 9695-03 5 A, 10 A, 50 A, 100 A
Model 9661 5 A, 10 A, 50 A, 100 A, 500 A
Model 9667-5kA (5000 A range) 5 kA
Model 9667-500A (500 A range) 500 A
Model 9669 100 A, 200 A, 1 kA
Model 9694 0.5 A, 1 A, 5 A
Model 9695-02 0.5 A, 1 A, 5 A, 10 A, 50 A
Model number and
the maximum rated
current
Reference
When using the CT9667 sensor,
choose “9667” for the sensor on
the Measurement Setting screen.
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What is CT ratio?
CT is used to measure large current to reduce the current measured to a
smaller level and supply the conversion result to an instrument.
CT ratio (current transformation ratio): A ratio used to convert the second-
ary current of CT to the primary current.
When the primary current is 100 A and the secondary current is 5 A, the
CT ratio is 20 (100 A/5 A). In this case, as the rated measurement current
is 5 A, set the current range to 5 A.
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