漠大线软启动跳闸故障中泵运行状态的控制方法

A method to control the running state of pumps in the case of soft-start trip: A case study on Mohe-Daqing Crude Oil Pipeline

为了解决定速输油泵软启动跳闸故障导致泵远控运行状态与现场实际不符及延时重启的问题,结合电气设备控制理论和PLC程序逻辑,建立了一种新的定速输油泵软启动跳闸故障中泵运行状态的控制方法。该方法是将漠大线各站场现有软启动设备上的启停状态辅助信号,上传至站控PLC系统,在站控PLC系统中编写控制逻辑对软启动的跳闸故障状态进行判断,从而控制定速输油泵机组的高压断路器。使软启动在发生跳闸故障后能够及时分开高压断路器,实现泵机组的远控运行状态与现场状态始终保持一致,并确保软启动跳闸故障发生后不出现延时重启现象。应用该方法不需要添加任何硬件设备,节约了支出成本,有效地消除了因定速输油泵机组软启动跳闸故障带来的安全隐患。

In actual practices, a soft-start trip of constant-speed oil pump may result in the inconsistency between remotecontrol and on-site running states and the delayed restart. In order to solve this problem, a new method to control the running state of constant-speed oil pump in the case of soft-start trip was developed with reference to the electrical equipment control theories and the PLC program logic. By virtue of this method, the auxiliary start/stop state signals of existing softstart equipments at all stations along Mohe-Daqing Crude Oil Pipeline are uploaded to the station control PLC system. Then, the fault state of soft-start trip is diagnosed by using the control logic programmed in the station control PLC system so as to control the high-voltage circuit breaker of constant-speed pump unit. In this way, the high-voltage circuit breaker can be separated in time once a soft-start trip occurs, so that the remote-control and on-site running states of pump unit remain consistent and the delayed restart will not occur after a soft-start trip. When this method is used, no more hardware is needed, so the cost is saved. By means of this method, the potential safety hazard caused by the soft-start trip of constantspeed oil pump unit is eliminated effectively.