Use more flexible and convenient Rogowski coil

Roche coil is also called current measuring coil and differential current sensor . It is mainly used to measure AC current . The coil frame surrounds the conductor under test . The magnetic field around the conductor will change with the current in the conductor , And the enameled wire on the induction frame .

According to mathematical derivation , The electromotive force is proportional to the derivative of the current in the conductor , And the proportional coefficient and the number of coil turns , Cross section of skeleton , Permeability and electromotive force integration , The conductor can be restored . Roche coil is a hollow ring coil , Flexible and rigid . It can be directly placed on the tested conductor to measure AC current . The working principle is based on Faraday's law . It describes the total electromotive force induced in closed and connected circuits . Proportional relationship between the time rate of change of the total magnetic flux .

Rogowski coil is similar to AC current transformer , Where the voltage is directed to the second coil , And it is proportional to the current flowing through the insulated conductor . The key difference is that the coil has a hollow , This is the opposite of current transformer , The latter relies on the high permeability steel core and the second winding to realize magnetic coupling . The hollow core is designed with low insertion resistance , To achieve faster signal response and linear signal voltage .

The hollow coil is placed in a ring around the current carrying conductor , The magnetic field generated by alternating current will induce voltage in the coil .Rokowski The coil is generated in the coil circuit and the current change rate （ derivative ） Proportional voltage . after , Integrate the coil voltage , So that the probe can provide an output voltage proportional to the input current signal .

Roche coil features ：

1. The coil is light and soft , It can be plugged in and out freely . It can detect many places that hard probes cannot reach , And it is easy to connect with the measured object ;

2. The insertion loss is almost zero , Only a few pihens , And the interference to the measured object is almost zero ;

3. The standard BNC Output interface , Easy to realize with oscilloscope , Data collector , Connection of digital voltmeter, etc , Observe the current waveform ;

4.USB Power supply interface design , More flexible and convenient to use ;

5. Audible and visual overcurrent alarm function , More humanized design ;

6. The length of probe ring and connecting wire can be customized according to customer requirements , To meet the test requirements of special occasions .

The above is the introduction of Roche coil , If you have other problems in use , Welcome to Xi'an puke Electronic Technology www.prbtek.com