Voltage selection coefficient:
1, power and weight of power generation and distribution system. The voltage decreases and the weight of the equipment increases, so the voltage cannot be too low.
2. Allowable voltage drop and strength of feeder. On the premise of transmitting the same power, if the voltage increases, the current decreases, the transmission conductor becomes thinner, the conductor resistance increases and the line voltage drop increases. At the same time, the strength of the wire also drops, so the voltage cannot be too high.
3. Personnel safety. The selection of voltage and frequency parameters needs to fully consider safety factors to ensure the safety of aircraft electrical equipment under normal operation and fault conditions. As the voltage increases, the safety will be reduced, so the voltage should not be too high.
Frequency parameter selection factors:
1, transmission efficiency. The system frequency is high, the inductive reactance of electrical equipment and lines increases, the capacitive reactance decreases, the loss increases and the transmission efficiency decreases.
2. cost. Low frequency will increase the material, weight and cost of electrical equipment.