The second phase alarm circuit
The circuit consists of a negative sequence voltage filtration device designed to mitigate negative sequence currents in electrical systems. The device employs a capacitor (C1) and multiple resistors (R1, R2, R3) configured to form a voltage divider and filter network. The values of the resistors are determined by the formula R1, R2, R3 = 5.5/C1 (KN), establishing a direct relationship between the resistance values and the capacitance of the capacitor used.
In the design process, the selection of the capacitor is critical and should be based on the anticipated current relay requirements. The formula provided allows for the calculation of the capacitance needed to ensure optimal performance. The desired current relay (I) is expressed in kiloamperes (KA), and the reliability factor (K) accounts for variations in operational conditions, typically ranging from 2.5 to 3. The rated voltage (U) of the capacitor must also be considered, ensuring that it can withstand the operating conditions without failure. The power frequency (f) is specified as 50 Hz, which is standard for many industrial applications.
This filtration device is essential in applications where negative sequence currents could lead to system inefficiencies or equipment damage. By properly selecting the capacitor and resistors based on the outlined requirements, the device can effectively filter out undesirable negative sequence components, improving the overall stability and reliability of the electrical system.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 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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