The second phase alarm circuit

  
A capacitor Cl and resistor Ri-R3 consisting negative sequence voltage filtration device. Resistors and capacitors to meet the following requirements: Ri Ra-Rz 5.5/C1 (KN) form
The second phase alarm circuit - schematic

ula, Cl units of anal F. The relationship between the resistance and capacitance values is arbitrary. Capacitor selection should be considered to meet the required current relay KA, can be calculated as follows: C Christine wherein Bu desired current relay KA, A; stupid - reliable factor, taking a 2.5 chu ~ 3; U. - Rated capacitor voltage, v; f power frequency, the frequency is 50Hz.




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