110kV轻载电缆线路对无功计量的影响
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摘要
当电缆输电线路处于空载热备用或轻载(使用容量小于额定容量的50%)运行时,线路对地会产生容性充电功率,其大小与电压等级及线路长度成正比。在110 kV电压等级下,电缆线路产生的容性电流会造成电网侧与用户侧电能表对无功电量的计量有较大差异。通过对青海某110 kV电缆输电用户轻载状态下实际用电情况进行分析,发现电缆线路对地电容每个月产生近300万kvar·h无功电量。电缆线路过大的无功补偿造成结算计量点与参考计量点的电能表无功电量有较大差异,从而导致用户每个月产生大量的力调电费。
As a power cable line works with light load( the operating load is less than 50% of the setting capacity) or bull load for backup,the line would produce capacitive charging power to the earth that is proportional positively to the line's voltage level and the length. The capacitive current of 110 kV power cable line would cause a large difference between the meterings of reactive power from the user side energy meter and from the grid side energy meter. Based on analysis of the user's actual power consumption during operation of 110 kV power cable line,it is found that the capacity of the line to the earth produces about 300 million kvar. h reactive power,and that the over reactive power compensation of the line result in a large difference between the reactive power metering from the clearing point and the reactive power metering from the reference point,and futher result in a large power regulation per month to user.
As a power cable line works with light load( the operating load is less than 50% of the setting capacity) or bull load for backup,the line would produce capacitive charging power to the earth that is proportional positively to the line's voltage level and the length. The capacitive current of 110 kV power cable line would cause a large difference between the meterings of reactive power from the user side energy meter and from the grid side energy meter. Based on analysis of the user's actual power consumption during operation of 110 kV power cable line,it is found that the capacity of the line to the earth produces about 300 million kvar. h reactive power,and that the over reactive power compensation of the line result in a large difference between the reactive power metering from the clearing point and the reactive power metering from the reference point,and futher result in a large power regulation per month to user.
引文
[1]DL/T645-2007多功能电能表通信协议[S].
[2]国家电网生[2004]435号.国家电网公司电力系统无功补偿配置技术原则[S].
[3]水利电力部、国家物价局文件-(83)水电财字第215号.功率因数调整电费办法[S].
[4]夏道止.电力系统分析[M].北京:中国电力出版社,2010.
[5]熊信银.发电厂电气部分[M].北京:中国电力出版社,2013.
[6]刘振亚主编.国家电网公司标准化建设成果(通用设计、通用设备)[M].北京:中国电力出版社,2011.
[7]陈珩.电力系统稳态分析[M].北京:中国电力出版社,1985.
[8]孟祥萍.电力系统分析[M].北京:高等教育出版社,2004.
[9]弋东方.电气设计手册电气一次部分[M].北京:中国电力出版社,2002.
[10]水利电力部西北电力设计院.电气工程设计手册电气一次部分[M].北京:中国电力出版社,1989.
[2]国家电网生[2004]435号.国家电网公司电力系统无功补偿配置技术原则[S].
[3]水利电力部、国家物价局文件-(83)水电财字第215号.功率因数调整电费办法[S].
[4]夏道止.电力系统分析[M].北京:中国电力出版社,2010.
[5]熊信银.发电厂电气部分[M].北京:中国电力出版社,2013.
[6]刘振亚主编.国家电网公司标准化建设成果(通用设计、通用设备)[M].北京:中国电力出版社,2011.
[7]陈珩.电力系统稳态分析[M].北京:中国电力出版社,1985.
[8]孟祥萍.电力系统分析[M].北京:高等教育出版社,2004.
[9]弋东方.电气设计手册电气一次部分[M].北京:中国电力出版社,2002.
[10]水利电力部西北电力设计院.电气工程设计手册电气一次部分[M].北京:中国电力出版社,1989.