To realize the rapid online diagnosis and alarm of the faults of power distribution equipment and water pumps in the pumping house of the water plant and its secondary booster pumping house so as to guarantee the safe operation of the pumping house system, an online diagnosis method of equipment in the pumping house is proposed based on the multipoint voltage and current information fusion. Based on the distribution equipment and pumps in the pumping house, the voltage and current characteristics of common faults in the power distribution equipment and water pumps in the pumping house, as well as the mutual influence mechanism of these faults, are systematically analyzed for the first time. The real-time voltage and current values of multiple key nodes in the distribution line are fused to extract the fault characteristics of six types of faults, including voltage overruns in the main circuit of the pumping house distribution, open air switches or contactors in the distribution line, open pump motor windings, imbalanced pump motor winding, inter-turn short circuit, pump blocking, connection break between the motor and pump, so as to realize the online diagnoses of these six types of faults. The implementation conditions of the method, the principle of implementation, and the specific steps are elaborated. Finally, MATLAB/Simulink is used to build a simulation model, which is experimentally verified. The simulation results show that the method can effectively diagnose the pumping house equipment faults, overcome the shortcomings of time-consuming and untimely offline analysis in the labor-intensive manual diagnosis, and provide effective protection for the safe operation of the distribution equipment and pumps in the water plant and its secondary booster pumping house.
图1为现有自来水厂、二次加压泵站水泵房配电系统示意图,主要由异步电机G、变频器INV、智能电量采集装置AKW、空气开关QF、接触器KM和热继电器FR等设备构成,图1中所有下标数字为对应设备编号.AKW i 具有通信功能,实现三相电压/线电压、三相电流/线电流、功率因数、频率、有功功率、无功功率等电气参数的实时监测和计量,安装于主回路以及各回路电机的输入端.
步骤1:终端设备组网.主计算机向各节点设备AKW i 发送组网指令,并等待应答.若在设定时间内收到应答,表明该节点设备成功入网,则标记其入网标志NS i =1;若某台节点设备连续n次(如3次)组网通信失败,表明该节点设备的入网失败,则NS i =0,并报警处理.若没有节点设备成功入网,则返回步骤1重新进行组网;若有节点设备成功入网,则执行步骤2.
步骤4:电机供电回路连接判断.顺序读取各台电机配电回路空气开关与接触器的运行状态标志SW i .若SW i =0,表示该回路未投入运行,不需对该回路的设备进行故障诊断;若SW i =1,表示该回路设备处于运行状态,需对该回路的设备进行故障诊断.若所有回路的空气开关、接触器都为断开状态,则返回步骤1;若有一个以上回路的空气开关、接触器为闭合状态,则执行步骤5.
步骤5:电气数据获取.主计算机采用轮询方式,顺序获取主回路AKW0、回路空气开关和接触器均处于闭合状态(SW i =1)和成功入网(NS i =1)的AKW i (i=1,2,3,4)采集的电压、电流数据,并按顺序将成功读取的AKW数据保存到对应节点的专用数据库或者存储空间.
AKW数据获取采用连续多次通信方式.在规定时间内,若连续多次通信都不能获得某台AKW的正确返回数据,则表明该AKW断网,将其标记为入网失败,并进行报警处理.若AKW0断网,或者所有AKW i (i=1,2,3,4)都断网,则返回步骤1;否则,在轮询读取完所有AKW i 的数据后执行步骤6.
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