- Tech know how online

crossed coiles instrument

The crossed-coil movement is similar in design to a moving-coil movement. It consists of two permanently connected coils crossed at an angle of 90°, which are rotatably arranged within the magnetic field of a permanent magnet. The pointer

is fixed to the coil frame. The torque of the cross-coil movement and thus its equilibrium condition depends on the ratio of the currents

through both coils. This is the reason why it is called moving-coil quota measuring mechanism.

Construction of a cross

Construction of a cross

-coil movement In a cross-coil instrument, one coil serves as a current coil (current path), the other as a voltage coil (voltage path). If two crossed coils are attached to a rotatably mounted iron core, a quotient meter is obtained with which thepower factor cos phi or phase shift

can bemeasured.

If an inductor is connected in the voltage path of a power meter, the phase is shifted by 90 degrees and a reactive power measurement is thus obtained.

Informationen zum Artikel
Englisch: crossed coiles instrument
Updated at: 22.09.2011
#Words: 142