Frequency conversion connects the resonance in series and able to bear pressing device operation principle and experimental principle and attentive matters of the product with trying:

Connect the harmonic return circuit equivalence return circuit circuit in series as follows:

U: Pigeonhole the output voltage after the series-parallel connection of the winding for the excitation voltage transformer, being controlled by the power of frequency conversion can be from 0 to Umax (Umax is the specified output voltage after a high-pressure winding series-parallel connection of voltage transformer of the excitation) Change continuously, the frequency 30-300Hz is changed continuously.

R: In order to connect the equivalence resistance of the harmonic return circuit in series, including the excitation voltage transformer reaches hindering inside, hindering, trying hindering and testing corona and lossing equivalence resistance,etc. in products in the high-pressure reactor of the high-pressure side equivalently.

L: For to connect return circuit in series the intersection of equivalence and inductance, namely excitation voltage transformer get to leak inductance, harmonic the intersection of reactor and sum of inductance high-pressure side equivalently. In the actual test, excitation voltage transformer leaks the relatively harmonic reactor inductance of the inductance smaller, can neglect. So is rough while calculating, can be thought to get the equivalence inductance of the harmonic return circuit in inductance of the reactor. There may be many series-parallel connections in the reactor in the actual test, the return circuit inductance at this moment is the inductance after many reactor series-parallel connections. When the series-parallel connection inductance of the reactor is calculated, can neglect it to hinder inside, calculate according to the series-parallel connection of the pure inductance.

C: It is the capacitive sum of load electric capacity and partial pressure device of the harmonic return circuit of series-parallel connection. Because electric capacity of partial pressure device very little, can neglect calculate, while being rough, as the intersection of load and instead of can relatively can’t neglect, electric capacity, should participate in calculating.

Offer, supply power power, by the intersection of excitation and after stepping up tentatively voltage transformer experimental voltage through the intersection of frequency conversion and power, on making the high voltage add in the reactor L and be tried the product CX, through changing the output frequency of the power of frequency conversion, make the return circuit in bunch

Unite the harmonic state; Keep this frequency not changing, regulate the output voltage of the power of frequency conversion, make the voltage tried on products reach

To the needing value. The harmonic frequency of the return circuit depends on the electric capacity CX and inductance L of trying product, harmonic frequency f =1/( 2