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Motor test measurements usually require ammeters to be equipped with multiple shunt units to solve the problem of ensuring the desired measurement accuracy over a larger measurement range. At this point, the rated voltage drop of all shunt used must match that of the ammeter (e.g. 75 mV).
Note the following when connecting the current transformer: 1) The secondary side of the CT must not be open when used. When disassembling the meter or relay during use, short circuit the secondary side beforehand. During installation, wiring should be reliable, and fuses should not be installed on the secondary side; 2) One end of the secondary side must be grounded.
Rogowski coil measurement schematic
A rogowski coil is a circular coil evenly wound around a non-ferromagnetic material. The output signal is the derivative of the current with respect to time. Through a circuit integrating the output voltage signal, the input current can be truly restored. The coil has the characteristics of real-time current measurement, fast response speed, no saturation, suitable for AC, especially high frequency current measurement.
Current transformer and rogowski coil
common mode choke
Common-mode choke: In the common filter, usually only one common-mode choke is installed, and the leakage inductance of the common mode choke is used to generate an appropriate amount of differential mode inductance,
DR Inductor
The skeleton of the I-inductor is supported by the winding of the copper coil. I-inductance is one of the attributes of an electronic circuit or device.
1) The same type of components can be replaced from the scrap circuit board. 2) First determine the inductance and current value, replace it with an ordinary inductor with a pin, and fix it well.
From the appearance, such as a square or round inductor with a magnetic core, slightly larger volume, can see the core and coil.
The chip inductor is only used in the output end of the low-voltage DC control power supply. Its application is seen in the π shape filter circuit of CLC with the filter capacitor, which can stabilize the output current (inhibit current mutation). Inductance components, consisting of a single coil, some with a magnetic core (large inductance), generally expressed in units of μH and mH, current values ranging from a few milliamps to several hundred milliamps.
