Technical Information for AC Current Sensor [MULTI MEASURING INSTRUMENTS Co.,Ltd.]

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Technical Information for AC CurrentSensor

Technical Information

Technical Information for AC Current Sensor

TECHNICAL INFORMATION

AC Current Sensor

Instruction of AC Current Sensor
MULTI AC Current Sensors(CTF,CTS,CTF-T,CT and ZCT series) are sprit type current sensor with various utility, high reliability and cost-performance for current measurements and controls.

It is possible to get the current data and interface to the circuit with simple clamping of the conductor by CT(current transformer).
These sensors are applicable for leakage current measurements,load current measurements,power measurements and metering etc.

[Measuring Principle]	[Equivalent Circuit]

The sprit type AC current sensor is the current transformer with ratio of ”n:1“ for the input current to be measured,when the secondary wound coils are ”n“ turns.
The secondary output current signal(I2) is converted to the voltage signal(E0) by load resistance(RL).
The load resistance value should be selected according to the range to be measured.

E 0 = K・I 1/n・ R L	K = Coupling Coefficient
(The factor K is depends on the core material and CT structure)

However,when the core material of CT is saturated by the over current flowing to the conductor, the linearity of secondary output current will be distorted and or the error of phase angle will be caused.

Before using of our current sensor, please refer to the specifications and output characteristic graph.
We recommend your right selection of appropiate sensor for your measuring application.

For your reference, the various current sensors are provided in our homepage like current sensor with DC voltage output ,high frequency current sensor for injection/measurements and pulse current sensor,etc.