摘要
零序直流选线系统用于易燃易爆场所电网保护,选线系统电路参数应确保接地检测电流不超过其允许值。根据系统检测电流的特点,只用漏电支路与选线系统检测源构成的电路模型确定系统接地检测电流允许值与电路参数的关系,给出了二者之间以电网相电压有效值与电网绝缘电阻为参变量的函数关系式。据此确定了电路参数之后,再计算将非漏电支路影响考虑在内的电网等效电路模型接地检测电流,其计算值与电网接地检测电流允许值相比,误差只有?0.06%。
The zero sequence DC line selection system is used as the way of power network protection in the place which it is easy to cause inflammation and blast.The parameter of the line selection system circuit should assure the grounding detection current is not beyond its permitted value.According to the speciality of the detection current in system, the circuit model composed by leakage current branch and the detection source of the line selection system is just used to assure the relation between the permitted value of the grounding detection current in system and the parameter of circuit.The functional relation which considers the virtual value of the phase voltage and the value of the insulated resistance in power network between two items as reference variable is given.In that case, after the circuit parameter is determined, then the grounding detection current of the equivalent circuit model of the power network can be calculated considering the effect of the non-leakage current branch.The error is only -0.06% compared with the permitted value of the grounding detection current of the power network.
出处
《电工技术学报》
EI
CSCD
北大核心
2005年第10期109-114,共6页
Transactions of China Electrotechnical Society
关键词
环境
参数
电缆
准确度
Circumstance, parameter, cable, accuracy
