500kV城市电缆线路过电压研究

Overvoltage of 500 kV City Cable Line

介绍了应用电磁暂态仿真程序EMTP对30 km以内的500 kV电缆线路的过电压进行的研究。研究结果表明:不超过30 km的500 kV电缆线路的工频过电压均不会超过规程规定;超过10 km的电缆线路的合空线过电压幅值会超过规程规定,而断路器加装400Ω的合闸电阻可较好地限制合闸过电压;超过12 km的电缆断路器断口电压以及线路相间电压均会超过规程规定,建议实际工程中采取必要的限制措施。

The overvoltage of 500 kV cable line within 30km was researched using electromagnetic transient simulation program（EMTP）. It is shown that the power frequency overvoltage will not exceed the stipulated specification if the length of cable-line is no more than 30 kin; the energizing line overvoltage will exceed if more than 10 km, while the closing overvoltage can be restricted by a 400Ω closing resistor installed in the circuit breaker; both the circuit- breaker voltage and the phase-to-phase voltage will exceed if more than 12 km, against which it is suggested to take some necessary restriction measures.