摘要
803电厂规划双回330kV线路接入酒泉750kV变电站,全线采用同塔双回路架设,增加了相间电容和相地电容,增加了系统过电压水平;另外,由于803电厂处于甘肃河西电网末端,运行条件较为苛刻。因而有必要对803电厂—酒泉双回330kV线路进行过电压研究。基于此,首先利用戴维南定理对803电厂—酒泉750kV变电站相关系统参数进行等值计算;然后利用电磁暂态程序ATP-EMTP对803电厂—酒泉750kV变330kV同塔双回线路的工频和操作过电压进行了计算,其中包括5种情况下的工频过电压,即:容升效应、单相接地、同回两相接地、异回两相接地以及甩负荷,并考虑了该5种情况下的潜供电流与恢复电压,以及4种情况下的操作过电压:单相重合闸、三相合闸、三相分闸以及三相带故障分闸。通过分析计算得到:线路的工频过电压满足绝缘配合要求,操作过电压可以通过金属氧化物避雷器限制到要求值以下,分析结果为双回线路运行提供了依据。
The 803 Power Plant will adopt 330 kV double-circuit line to access Jiuquan 750 kV substation, and it is necessary to research the overvoltage on the 803 Power Plant to Jiuquan 330 kV double-circuit line. Consequently, the related system parameters of the 803 Power Plant to Jiuquan 750 kV substation were equivalently calculated with the Thevenin＇s Theorem. Then temporary and switching overvoltages of 330 kV double-circuit line from the 803 Power Plant to Jiuquan 750 kV substation were calculated by means of the electromagnetic transient program ATP- EMTP, in which the temporary overvoltage contained capacitive rise effect, single-phase grounding, two-phase grounding,load rejection, secondary arc current, and recovery voltage, and the switching overvoltage was caused by single-phase reclosure,three-phase closing, three-phase shutdown, and three-phase shutdown with fault. Calculation results reveal that the temporary overvoltage on double-line is coordinate to insulation requirements, switching overvoltage can be limited to the required value by metal oxide surge arresters.
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2011年第10期2450-2457,共8页
High Voltage Engineering
关键词
工频过电压
操作过电压
合闸电阻
同塔双回330
KV线路
潜供电流
恢复电压
酒泉750
kV变电站
temporary overvoltage
switching overvoltage
closing resistor
330 kV double circuit transmission line on the same tower
secondary arc current
recovery voltage
Jiuquan 750 kV substation
